Entries |
Document | Title | Date |
20080198066 | Apparatus and method for calibrating signal in multi-antenna system - A calibration apparatus and method for use in a transmitting end of a multi-antenna system. The apparatus comprises at least two antennas, at least two transmitters for transmitting a signal through one of the antennas and transmitting a reference signal for channel estimation of transmission and reception paths, at least two receivers for receiving a signal through one of the antennas and coupling and receiving a reference signal transmitted through one of the antennas except the antenna for receiving the signal, and a calibration section for estimating channels for transmission and reception paths of the transmitters and the receivers using reference signals received by the receivers and calibrating signals to be transmitted through the transmission paths using the estimated channels. | 08-21-2008 |
20080224919 | SYSTEM AND METHOD FOR DUAL POLARIZATION RADAR WITH AUTOMATIC BUILT-IN TEST EQUIPMENT AND CALIBRATION - A method of calibrating a dual polarization weather radar system has been developed. The method first generates a transmission pulse from the radar system. The transmission pulse is then modified to generate a test signal that simulates a desired atmospheric condition. The test signal is transmitted directly into the radar system from a test antenna and the radar system is calibrated according to the test signal. | 09-18-2008 |
20080224920 | SYSTEM AND METHOD FOR DUAL POLARIZATION RADAR WITH AUTOMATIC BUILT-IN TEST EQUIPMENT AND CALIBRATION - A calibration system for the receiver of a dual polarization radar system has been developed. The system includes a radar transmitter that transmits signals in horizontal and vertical polarizations and a radar receiver that receives the horizontal and vertical polarization signals. The system also includes a test signal generator that generates a continuous wave test signal. A calibration circuit for the radar receiver modifies the test signal to simulate weather conditions by adjusting the attenuation and Doppler phase shift of a continuous wave test signal. | 09-18-2008 |
20080224921 | VARIABLE RATIO POWER DIVIDER FOR A DUAL POLARIZATION RADAR SYSTEM WITH AUTOMATIC BUILT-IN TEST EQUIPMENT AND CALIBRATION - A variable ratio power divider (VRPD) used for adjusting a calibration signal for a dual polarization radar system has been developed. The VRPD includes an input line that receives a calibration signal and splits the calibration signal into two separate test signals that have a 0° phase shift between them. The VRPD also includes a horizontal polarization output port for a horizontal calibration signal and a vertical polarization output port for a vertical calibration signal. A waveguide switch receives one of the test signals. If the waveguide switch is operating in an open position, it passes the test signal through a variable 0°-180° phase shifter. This evenly divides the power of the test signals between the horizontal and vertical output ports. If the waveguide switch is operating in a closed position, it causes the test signal to bypass the phase shifter so that the entire power of the both test signals is directed entirely to either the horizontal phase output port or the vertical phase output port. | 09-18-2008 |
20080238763 | METHOD AND SYSTEM FOR CALIBRATING RADAR ALTIMETERS - A method for calibrating an altimeter is disclosed. The method comprises monitoring signal strength of one or more altitude measurements. Based on the signal strength, the method applies piecewise linear altitude correction to the one or more altitude measurements to generate altitude correction data. The method further determines a goodness-of-fit for the altitude correction data. The altitude correction data maintains a correct altitude measurement in the presence of variable signal strength. | 10-02-2008 |
20080272959 | Duplexer for Simultaneous Transmit and Receive Radar Systems - An enhanced duplexer ( | 11-06-2008 |
20080291079 | DIGITAL BEAM-FORMING APPARATUS AND TECHNIQUE FOR A MULTI-BEAM GLOBAL POSITIONING SYSTEM (GPS) RECEIVER - An advanced multiple-beam GPS receiving system is achieved that is capable of simultaneously tracking multiple GPS satellites independently, detecting multiple interference signals individually, and suppressing directional gain in the antenna pattern of each beam in the interference directions. The GPS receiving system can be used for both planar and non-planar receiving arrays, including arrays that are conformally applied to the surface of a platform such as an aircraft. The GPS receiver combines spatial filtering and acquisition code correlation for enhanced rejection of interfering sources. Enhanced gain in the direction of GPS satellites and the ability to shape the beam patterns to suppress gain in the direction of interfering sources make the GPS receiving system largely insensitive to interfering and jamming signals that plague conventional GPS receivers. | 11-27-2008 |
20080297402 | BUILT-IN MISSILE RADAR CALIBRATION VERIFICATION - Array antenna calibration verification coupling interrogator and responder with mode-related interrogation signal having a previous calibration phase angle, producing in responder a characteristic interrogation response. Conjugate signal is generated by reversing phase of interrogation signal, producing in responder a characteristic conjugate response. Interrogation and conjugate responses sensed and combined to determine difference characteristic for responder array element. Responder difference characteristic iteratively determined for elements in antenna array representative of present calibration verification state. Present and previous calibration verification states compared, with significant variation adapting array to desired calibration verification state. Verification processor controls interrogator, responders, and signals providing built-in missile RADAR calibration verification. | 12-04-2008 |
20090027258 | SYSTEMS AND METHODS FOR ANTENNA CALIBRATION - A method according to an aspect of the present invention includes determining a phase offset by simultaneously providing a calibration signal to a first element of an antenna and a second element of the antenna opposite the first element. The method further includes receiving an intermix signal by a third element of the antenna, measuring an amplitude characteristic for the intermix signal, and determining a phase offset based on the amplitude characteristic. The phase offset can be used to adjust a signal provided to the first element so that it is in phase with the signal provided to the second element. This method can account for phase errors due to the construction or design of the antenna, and allows antenna elements to be calibrated without the need for phase detector devices. | 01-29-2009 |
20090046003 | Method and Apparatus for Beamforming of Multi-Input-Multi-Output (MIMO) Orthogonol Frequency Division Multiplexing (OFDM) Transceivers - An embodiment of the present invention includes a calibration system employed in a multi-input-multi-output (MIMO) system for beamforming and receiving a plurality of streams. The system includes a first calibration circuit responsive to inphase (I) and quadrature (Q) pairs of stream and operative to calibrate each I and Q pair and a second calibration circuit responsive to the calibrated I and Q pairs for all streams, wherein the first and second calibration circuits perform calibration in the time domain. | 02-19-2009 |
20090079618 | Time-of-flight radar calibration system - A time-of-flight calibration system for a radar-based measurement device is provided. The time-of-flight calibration system includes a target antenna and a waveguide, e.g. a coaxial cable. The waveguide is coupled at one end to the target antenna and terminated at its other end by a wave-reflecting impedance. | 03-26-2009 |
20090109085 | METHOD AND SYSTEM FOR CALIBRATING AN ANTENNA ARRAY FOR AN AIRCRAFT SURVEILLANCE SYSTEM - In accordance with one aspect of the present invention, a method is provided for calibrating an aircraft surveillance system for a protected aircraft. The system has a phased antenna array comprising antenna elements. The method comprises transmitting a first signal from a first antenna element in the array, and receiving the first signal at a third antenna element. The first signal may represent an interrogation signal transmitted in connection with a surveillance transmit sequence to locate potential intruding aircraft into a range of the protected aircraft. The method further includes transmitting a second signal from a second antenna element and receiving the second signal at the third antenna element. The method also includes calculating calibration information for the antenna array based on the first and second signals received at the third antenna element. During each transmit operation only a single antenna element transmits at one point in time. | 04-30-2009 |
20090128398 | Method of Calibrating a Sensor System - A method for calibrating a sensor system having transmitters and receivers mounted on a vehicle at a distance from one another, and for measuring the distance of the vehicle from a roadway boundary, by a) sending a send signal at a first time, using a transmitter of the sensor system, b) converting the received send signal to a receive signal using a receiver of the sensor system, and establishing a second time at which the receive signal exceeds a certain threshold value, c) determining the propagation time of the send signal from the transmitter to the receiver from the difference in time between the second time and the first time, d) repeating a) to c) cyclically for a certain number of cycles, e) determining a frequency distribution of the propagation times determined in c), and f) generating a sensor distance value, which correlates with the sensor propagation time between the transmitter and the receiver, with the frequency distribution determined in e). | 05-21-2009 |
20090153394 | METHOD FOR ACCURATE AUTO-CALIBRATION OF PHASED ARRAY ANTENNAS - A method and apparatus is disclosed that is capable of verifying on site the health, calibration and integrity of individual phased array modules of a phased array antenna system and, in certain cases, enabling the phased array antenna system to overcome element failures by use of a beam-steering computer. The present disclosure provides a test probe or RF radiator in or adjacent the antenna array for supplying and receiving test and calibration signals. | 06-18-2009 |
20090201195 | SIGNAL ACQUISITION AND METHOD FOR ULTRA-WIDEBAND (UWB) RADAR - An acquisition channel ( | 08-13-2009 |
20090219195 | Unwrapping of Phase Values At Array Antenna Elements - A method and apparatus are described for the unwrapping of a set of phase values observed for an incoming signal on a phased array antenna. The difference between values observed on adjacent elements in the array forms a first data set. The differences between adjacent ordinates in the first data set forms a second data set. The values in the second data set are rounded to the nearest whole multiple of one complete cycle before the differencing process is reversed to provide the values (representing a whole number of complete cycles) which are added to the observed phase values to provide the unwrapped phase values. | 09-03-2009 |
20090237296 | Variable Ratio Power Divider for a Dual Polarization Radar System with Automatic Built-in Test Equipment and Calibration - A variable ratio power divider (VRPD) used for adjusting a calibration signal for a dual polarization radar system has been developed. The VRPD includes an input line that receives a calibration signal and splits the calibration signal into two separate test signals that have a 0° phase shift between them. The VRPD also includes a horizontal polarization output port for a horizontal calibration signal and a vertical polarization output port for a vertical calibration signal. A waveguide switch receives one of the test signals. If the waveguide switch is operating in a first position, it passes the test signal through a variable 0°-180° phase shifter. This evenly divides the power of the test signals between the horizontal and vertical output ports. If the waveguide switch is operating in a second position, it causes the test signal to bypass the phase shifter so that the entire power of the both test signals is directed entirely to either the horizontal phase output port or the vertical phase output port. | 09-24-2009 |
20090267824 | ANTENNA ARRAY CALIBRATION - An antenna array comprises a surface comprising a replicated pattern of conductive tracks, the tracks defining a plurality of ports. A plurality of antennae are located at ports distributed about the surface. A plurality of radiative transceivers are electrically connected to a respective antenna. A plurality of reference transceivers are electrically connected to a non-radiative impedance located at a respective port so that each reference transceiver is surrounded by a group of antennae and electrically coupled to the group of antennae by the tracks. At least one antenna from at least one group of antennae belongs to one other group of antennae. Calibration circuitry includes a controller associated with each reference transceiver, each controller being arranged to transmit a calibration signal through an associated reference transceiver and to receive and store a received calibration signal from a selected transceiver for the group of antennae coupled to the reference transceiver. Each controller is further arranged to receive and store a calibration signal from the selected transceiver for the group of antennae coupled to the reference transceiver. The calibration circuitry further includes for each other transceiver for the group of antenna, circuitry for adjusting the phase and amplitude of signals transmitted and received by the radiative transceivers relative to the stored calibration signals for the selected radiative transceiver. | 10-29-2009 |
20090284408 | EXPANDABLE SIGNAL CALIBRATION TARGET - A high frequency signal calibration target deployable in outer space includes an expandable and electrically conductive symmetric structure. The structure may mechanically expand from a stowed configuration to a deployed configuration. Scatter of high frequency signal off of a substantially symmetric signal calibration target may be measured to accurately calibrate systems using high frequency signals. | 11-19-2009 |
20090284409 | Dual Polarization Radar with Automatic Built-In Test Equipment and Calibration - A calibration system for the receiver of a dual polarization radar system has been developed. The system includes a radar transmitter that transmits signals in horizontal and vertical polarizations and a radar receiver that receives the horizontal and vertical polarization signals. The system also includes a test signal generator that generates a continuous wave test signal. A calibration circuit for the radar receiver modifies the test signal to simulate weather conditions by adjusting the attenuation and Doppler phase shift of a continuous wave test signal. | 11-19-2009 |
20090315760 | HYBRID TRACKING CONTROL SYSTEM AND METHOD FOR PHASED-ARRAY ANTENNAE - A hybrid control algorithm for low profile phased-array antennas, consisting of a gyro control and electronic beam-forming, operates to track the satellite. The antenna arrangements form a spatial phased-array capable of being rotated mechanically both in azimuth and elevation planes by the aid of step motors. An RF detector monitors the received RF power and provides a feedback signal to the control algorithm. Based on the monitored signals, provided by RF detector and gyros, the processing unit operates, under suitable algorithms, to home on and track the desired satellite. The arrangements can be mounted on a vehicle to provide TV and broadband internet signal to the user on the move. | 12-24-2009 |
20100001898 | GPS MODULE TEST SYSTEM FOR AUTOMATICALLY CALIBRATING TEST SIGNAL - A GPS module test system for automatically calibrating a test signal includes a GPS test fixture, a satellite signal simulator, and a computer. The GPS test fixture carries a GPS module under test and is electrically connected to the same through contact, so as to receive a digital signal generated by the GPS module after the test. The computer receives device information of the GPS module under test through the GPS test fixture, and controls the satellite signal simulator through a GPS signal sample database, so as to generate a GPS analog signal to test the GPS module under test. Thereafter, on receiving the digital signal generated by the GPS module under test and determining the received digital signal is attenuated, the computer automatically gains a transmitted test parameter, so as to transmit the GPS analog signal in a preferable state. | 01-07-2010 |
20100026561 | WIRELESS COMMUNICATION DEVICE, WIRELESS COMMUNICATION METHOD, AND COMPUTER PROGRAM - A wireless commutation device includes: an antenna unit including antennas transmitting and receiving wireless signals; an analog processing unit including transmitting analog circuits and receiving analog circuits processing analog transmitting and received signals; a digital processing unit processing digital transmitting and received signals; an inter-antenna propagation loss determination unit determining propagation losses between the antennas; a loopback transfer function gain acquisition unit acquiring, through loopback of a calibration signal between the antennas, gains of loopback transfer functions between antenna branches; a loopback transfer function gain correction unit correcting the gains by using the propagation losses; a correction coefficient determination unit determining the respective gain ratios among the receiving analog circuits and the transmitting analog circuits by using the corrected gains, and determining correction coefficients by using the gain ratios; and a gain calibration processing unit performing gain calibration on the digital transmitting and received signals by using the correction coefficients. | 02-04-2010 |
20100045510 | AUTOMATIC SATELLITE ACQUISITION SYSTEM FOR A PORTABLE SATELLITE TERMINAL - A system for accurate automatic satellite acquisition by a portable satellite terminal. The system includes a software program that coordinates inputs from several measurement aids to control antenna position. These aids include a GPS receiver, antenna azimuth, elevation and polarization angle sensors, and the terminal's modem, DVB receiver and spectrum analyzer, which contains a beacon detector also serving as Receive Signal Strength Indicator (RSSI). For satellite recognition, the spectral analysis and RSSI function are complemented by the lock/unlock indications provided by the modem and the DVB receiver. Under the control of the software program, the modem, DVB receiver and spectrum analyzer, in conjunction with an extensive database of satellites and their signal characteristics, provide the means for reliable validation of final alignment. | 02-25-2010 |
20100073220 | SELF CALIBRATION METHOD FOR RADIO EQUIPMENT WITH RECEIVE AND TRANSMIT CIRCUITRY - A self-calibration circuit for testing an RF device includes the RF device to be tested having transmit and receive sections, and a built-in self test (BIST) circuit coupled to the transmit and receive sections of the RF device on the same chip. The self-calibration circuit is configured to calibrate the receive section of the RF device in a receive test mode, and calibrate the transmit section of the RF device in a subsequent transmit test mode using the calibrated receive section to measure a transmit output signal from the transmit section and to provide calibration data therefrom used in the transmit section calibration. The self-calibration circuit may include a duplex filter coupled between the transmit and receive sections and the BIST circuit, and a multiplexor coupled between the RF device, and the BIST circuit, configured to select one or more of a plurality of RF devices to be tested. | 03-25-2010 |
20100103025 | Near Field Electromagnetic Calibration System - A system and method for electromagnetic position determination utilizing a calibration process. For calibration, a transmitter is positioned at multiple locations in an area of interest and multiple receivers receive and record signal characteristics from the transmitter to generate a calibration data set. The unknown position of a transmitter may be determined by receiving signals from the transmitter by multiple receivers. A locator data set is generated based on the comparison between two received signal characteristics determined for each receiver. The locator data set is compared with the calibration data set to determine the unknown position. In one embodiment, the signal comparisons are the differences between electric and magnetic field phase. Further embodiments utilize signal amplitude differences. A reciprocal method utilizing a single receiver and multiple transmitter locations is disclosed. A further method is disclosed for determining position by utilizing signals available from existing installed wiring such as power wiring. | 04-29-2010 |
20100117890 | ANTENNA RECIPROCITY CALIBRATION - A method and a system for calibrating at least one antenna ( | 05-13-2010 |
20100123618 | CLOSED LOOP PHASE CONTROL BETWEEN DISTANT POINTS - Methods for compensating for phase shifts of a communication signal. The methods involve determining a first reference signal (V | 05-20-2010 |
20100164782 | Calibration apparatus and method - There is provided an apparatus for calibrating a multi-beam satellite system comprising a beam forming network providing a plurality of signal paths, the apparatus comprising a calibration processor for determining the phase and amplitude shift of a test path of the plurality of signal paths by correlating a calibration tone extracted from the test path with a reference calibration signal, the calibration processor being configured to determine the phase and amplitude shifts of the test path for at least two calibration tones of at least two different frequencies. The apparatus also comprises means for applying a correction based on the determined phase and amplitude shift to the test path in the beam forming network. The two calibration tones of at least two different frequencies may be calibration tones injected at two different frequencies but also calibration tones translated into two different frequencies by the beam forming network. The invention allows a phase and amplitude shift for any path through the beam forming network to be calculated for any frequency in an operational frequency range of the multi-beam satellite system and corrections to be applied to form or interpret the required downlink or uplink beams of the multi-beam satellite system. | 07-01-2010 |
20100182191 | RECEIVER EQUALISATION - The present invention relates to a method of receiver equalisation. More specifically, the present invention relates to a method of receiver equalisation in multi-function radar apparatus. The present invention provides a method of receiver equalisation comprising passing a known RF pulse through a receiver array; comparing an output of the receiver array with a reference output of that array; and calculating a correction waveform to be applied to the output of the array antenna at all times required during normal radar operation. | 07-22-2010 |
20100194624 | SIMULTANEOUS CALIBRATION AND COMMUNICATION OF ACTIVE ARRAYS OF A SATELLITE - An apparatus for simultaneous calibration and communication of active arrays of a satellite may include a base transmitter, a satellite receiver, a satellite transmitter, a base receiver, and at least one computer. The apparatus may simultaneously transmit and receive a calibration carrier and a communication carrier at different frequencies in order to calibrate the apparatus using the calibration carrier without interrupting the communication carrier. The use of different frequencies may avoid interference between the calibration and communication carriers. | 08-05-2010 |
20100194625 | METHOD AND SYSTEM TO MEASURE NOISE INSERTED MM-WAVES - The present invention relates to a radiometer for detecting electromagnetic signals in the microwave and millimetre wave range. The radiometer comprises an antenna operable to receive the electromagnetic signals, an internal noise signal generator operable to receive a control signal and to generate and output a calibration noise signal depending on the control signal, and a coupler operable to couple the received electromagnetic signal with the calibration noise signal and to output a coupled electromagnetic signal. Furthermore, the internal noise signal generator is activated based on the control signal. | 08-05-2010 |
20100220003 | ANTENNA CALIBRATION - The present invention relates to antenna calibration for active phased array antennas. Specifically, the present invention relates to a built in apparatus for autonomous antenna calibration | 09-02-2010 |
20100245158 | ANTENNA CALIBRATION - The present invention relates to antenna calibration for active phased array antennas. Specifically, the present invention relates to a built in apparatus for autonomous antenna calibration | 09-30-2010 |
20100253571 | ANTENNA CALIBRATION - The present invention relates to antenna calibration for active phased array antennas. Specifically, the present invention relates to a built in apparatus for autonomous antenna calibration | 10-07-2010 |
20100253572 | Systems and Methods for Antenna Array Calibration - Antenna arrays are calibrated by providing one or more test signals from the antenna array to be calibrated to a receiving sensor while varying ambient operating conditions over some predetermined range of ambient operating conditions. The signal properties of these test signals may be measured by the receiving sensor or associated spectrum analyzer, and the ambient operating conditions under which the test signals are provided may be similarly measured. Thereafter, signal offsets for each of the antenna array's elements may be determined as a function of the measured ambient operating condition. Calibration information corresponding to these signal offsets may then be stored in a memory of the antenna array for use during operation of the antenna array. This calibration information may be in the form of a lookup table or a curve-fitting equation. | 10-07-2010 |
20100277363 | USER-EXECUTABLE ANTENNA ARRAY CALIBRATION - A system used for calibrating a direction-finding system. A device may include a signal receiver array. The signal receiver array may be utilized to determine the direction of arrival for signals emitted by other devices, and therefore, may be used to resolve the direction towards another device using the received signal. For example, an external tag may be utilized to emit a wireless signal usable inducing a response in each signal receiver of the signal receiver array. The device may also include one or more sensors usable in determining device orientation and/or a change in device orientation. The combined signal receiver response information and orientation information may be recorded at various instants as the device is moved for use in calibrating the antenna array. | 11-04-2010 |
20100283665 | Mitigation of RF Oscillator Pulling through Adjustable Phase Shifting - A digitally controlled mechanism for the minimization of the self-interference caused by an amplitude modulated signal generated within a polar transmitter to the oscillator circuit, where the carrier of that transmitter is created. A digitally controlled delay between the circuit where the signal is generated and the circuit where it is amplitude-modulated allows adjustment of the delay or phase-shift between the aggressing and victim signals. The optimal delay that is to be introduced in the path is determined, and a corresponding control word is generated to arrive at the selected delay/phase-shift. | 11-11-2010 |
20100321233 | METHOD FOR CALIBRATING ANTENNA ARRAYS - A method is provided for use in calibrating a plurality of antennas comprised in an antenna array and wherein the antenna array comprises at least one gain control circuitry. The method comprises: transmitting one or more pre-defined signals by at least one antenna comprised in the antenna array; receiving at one or more of the antennas comprised in the antenna array, a signal derived from a corresponding pre-defined signal transmitted by the at least one antenna; and for each of the one or more antennas, detecting whether there is any difference between the corresponding one or more pre-defined signals transmitted thereto and the respective one or more signals received thereat, and if in the affirmative, applying the detected differences in a process of calibrating the one or more antennas comprised in the antenna array, and wherein the process of calibrating the one or more antennas comprised in the antenna array comprises a step of estimating a ratio of complex transmission coefficients for at least two states of the at least one gain control circuitry. | 12-23-2010 |
20110001660 | SELF CALIBRATING CONFORMAL PHASED ARRAY - A system and method for a self calibrating conformal phased array are disclosed involving a plurality of transmit/receive elements; a plurality of embedded, calibration transmit/receive elements scattered across the array; and at least one back-end processor. The calibration transmit/receive elements are used to track any physical calibration transmit/receive element's relative position change caused by array flexure. In one or more embodiments, each of the calibration transmit/receive elements transmit a tone using a small antenna, and the other calibration transmit/receive elements receive the tone using small antennas. The calibration transmit/receive elements that receive the tone measure the phase of the received tone. At least one back-end processor uses the measured phases to determine differential phases from a phase calibration table. Also, at least one back-end processor uses the differential phases to compute a change in apparent location of each transmitting calibration transmit/receive element. | 01-06-2011 |
20110068971 | ENHANCED CALIBRATION FOR MULTIPLE SIGNAL PROCESSING PATHS IN A WIRELESS NETWORK - Calibrating signal processing paths for a plurality of transmission devices by obtaining calibration data for at least one of the signal processing paths for each of the transmission devices and determining a plurality of calibration weights from the calibration data for each of the transmission devices. A calibration variance is calculated between the plurality of calibration weights and it is determined if the calibration variance is below a calibration variance threshold. Additionally, a phase variation and a magnitude variation are calculated from the calibration data for each of the transmission devices with respect to a reference transmission signal obtained from a reference transmission device and it is determined for each of the transmission devices if the phase variation is below a phase variation threshold and if the magnitude variation is below a magnitude variation threshold. Further, if the calibration variance is below the calibration variance threshold, and the phase variation is below the phase variation threshold and the magnitude variation is below the magnitude variation threshold for each of the transmission devices, then the plurality of calibration weights are applied to the at least one of the signal processing paths of each of the transmission devices. | 03-24-2011 |
20110122016 | Phased array antenna having integral calibration network and method for measuring calibration ratio thereof - A phased antenna arrangement and a method for estimating the calibration ratio of an active phased antenna having a plurality of phased array antenna elements are described. The phased antenna arrangement includes a plurality of antenna elements, a plurality of receiving channels, an injection unit for injection of calibrating signals into the receiving channels, a point RF-source, located in a far field zone, a distance measurement unit, an amplitude and phase measurement unit and a data processing unit. The method comprises injecting an internal calibrating signal having a known amplitude and phase to each antenna element. An external calibration signal from a stationary RF-source is sequentially injected to all of the phased array antenna elements so that different phases of the external calibration signal arrive at each of the antenna elements. The differences in phases of the external calibration signal reaching the antenna elements are compensated so as compute an effective signal amplitude that would reach all of the antenna elements at zero phase difference. Calibration ratio is calculated as the ratio between the amplitude of the internal calibrating signal to the effective signal amplitude of the external calibration signal. | 05-26-2011 |
20110133982 | System and Method for Calibration of Phased Array Antenna Having Integral Calibration Network in Presence of an Interfering Body - A method for calibrating an antenna comprising a phased array of antenna elements connected to a plurality of transceivers, the method comprising providing an RF source located close to the antenna and synchronized with the transceivers, determining, per antenna element, a calibration ratio adapted to accommodate for presence of at least one interfering structure electromagnetically interfering with a signal transmitted from the RF source and received by the antenna, wherein the determining includes generating simulated far field and near field signals so as to simulate a signal transmitted by an RF source located at infinity and located near the RF source respectively, internally injecting an internal signal into the antenna via an internal injection network, using the RF source to externally inject an external signal into the antenna; and, for each individual antenna element, computing said calibration ratio by combining information characterizing the internal and external signals as received by the individual antenna element with a correction factor characterizing the simulated far field and near field signals; and calibrating the antenna using the per-antenna element calibration ratios adapted to accommodate for presence of at least one interfering structure. | 06-09-2011 |
20110234452 | POSITIONING SYSTEM CALIBRATION - The described principles provide a method and system for calibrating an UWB RF positioning system. Means for automated calibration of the UWB RF positioning system allow calibration based on simple user input that does not require accuracy. Thus, the disclosed calibration means enables nomadic deployment of UWB RF positioning systems by enabling fast and easy calibration and re-calibration of the system based on in-use data to correct for changes in the system during use. Furthermore, in an embodiment of the invention, means are provided for direct feedback of calibration accuracy to the user. In a further embodiment of the invention, the full use of a UWB positioning system is enabled by obtaining optimal accuracy even at the outskirts of the tracking volume and by providing optimal accuracy for a given number of receivers. | 09-29-2011 |
20110304499 | SYSTEM FOR DETERMINING THE MOVEMENT OF A SWAYING STRUCTURE - A system for determining the movement of a swaying structure, on which a receiver is fixedly mounted, is proposed, wherein at least three reference transmitters having known and fixed positions are provided and transmit the transmission signals received by the receiver at defined carrier frequencies. In addition, an evaluation unit is provided, which determines measured phase values from the received signals, taking into account the defined carrier frequency, wherein the distance from the reference transmitters and the changes in position of the receiver and therefore of the swaying structure can be calculated from said phase values. | 12-15-2011 |
20120001794 | System for Response to a Signal Transmitted by a Radar and Use of this System Notably for Testing Radars, in Particular of the MTI Type - A system for response to a signal transmitted by a radar includes: a passive antenna capable of receiving and then backscattering a signal transmitted by said radar; a microwave switch connected to said antenna; at least two microwave lines each having a distinct impedance and being connected to the microwave switch; and a generator capable of generating a parametrizable control signal and sending it to the microwave switch so that it switches onto one or other of the microwave lines, so as to modulate the signal backscattered by said antenna. | 01-05-2012 |
20120007770 | SYSTEM FOR CALIBRATION OF DUAL POLARIZATION RADAR WITH BUILT-IN TEST COUPLERS - A calibration system for a dual polarization radar system with built in test couplers has been developed. The system includes a dual polarization radar transmitter antenna that generates a transmission pulse. A test coupler is located behind the antenna that reads a sample of the transmission pulse a test signal. A calibration circuit receives the sample of the transmission pulse and generates a test signal that simulates a desired atmospheric condition. Finally, a test antenna transmits the test signal to the dual polarization radar transmitter antenna for calibration of the system. | 01-12-2012 |
20120081249 | RADIOLOCATION USING PATH LOSS DATA - Determining the location of a station in a wireless network including determining path losses between the wireless station of unknown location and at least some access points at known locations. The determining includes receiving measurements from the wireless station of unknown location, and measuring the received signal strengths as a result of respective transmissions from at least some of access points at known respective transmit powers and known or determined locations to obtained measured path losses. The method further includes determining a location for the wireless station using the measured path losses and a calibrated path loss model. | 04-05-2012 |
20120098697 | TIME TRANSFER METHOD AND SYSTEM - A Time Transfer Time Reverse Mirror (TT TRM) method and system includes a radio transceiver for transmitting a series of short pulses repeatedly at a period T and for receiving from a remote node a return signal that is a retransmission of the original signal at the same period T: a clock circuit for inputting a clock signal to the transceiver: and a computer for (i) computing and generating an imaginary time-reversed signal version of the original signal, (ii) comparing the return signal with the imaginary version. (iii) computing a delay between the return signal and the imaginary version that is substantially equal to twice the time difference between the two nodes, and (iv) applying the computed delay to a clock input calibration for a desired signal. The system includes time transfer using the ionospheric reflection (refraction), producing precise synchronization among remote nodes beyond the line-of-sight and thus without necessitating GPS or communication satellites. | 04-26-2012 |
20120139776 | Obtaining a Calibration Parameter for an Antenna Array - Embodiments herein include a method for obtaining a calibration parameter for an antenna array. The antenna array comprises a first and a second radio module with respective associated antennas, wherein both radio modules comprise a main transmitter and a connected calibration receiver or both radio modules comprise a main receiver and a connected calibration transmitter. The method comprises: injecting a first calibration signal in the first radio module and measuring a first response to the first calibration in the first radio module. This injecting and measuring is repeated for all combinations of the first and second radio modules. Finally, a numerical value is calculated using the responses; a calibration parameter is calculated based on the calculated numerical value. Embodiments herein also include a corresponding antenna array, computer program and computer program product. | 06-07-2012 |
20120146841 | PHASED ARRAY ANTENNA AND ITS PHASE CALIBRATION METHOD - A phased array antenna includes an oscillator, a plurality of antenna elements, a phase shifter, a distributor, a receiver, and a control processor. The control processor performs a first calibration process to calibrate a phase of the phase shifter connected to a pair of antenna elements that is selected from the antenna elements and are located at a pair of positions symmetric with respect to a central axis of an array formed by the phased array antenna, and a second calibration process to calibrate a phase of the phase shifter connected to a pair of target antenna elements with respect to a phase of the phase shifter connected to a reference antenna elements located at a central portion of the array. The pair of target antenna elements are located at a pair of positions that are symmetric with respect to the central axis of the array. | 06-14-2012 |
20120154206 | CALIBRATION TECHNIQUE FOR PHASED ARRAY ANTENNAS - A method for calibrating a phased-array antenna that involves transmitting a signal from a transmitting element, and sequentially receiving the transmitted signal at two receiving elements each spaced a first distance from the transmitting element. This step is then repeated one or more times, but transmitting from a different transmitting element in each repetition of the step, until each element being calibrated has received at least one transmission. Then, the first distance is changed to a second distance, and the steps are repeated one or more times to gather additional measurements. These measurements allow the determination from the received signals of two separate element mutual coupling ratios, one ratio for one subset of the elements being calibrated and the other for a second subset comprising the remaining elements being calibrated. Next, at least four additional transmissions and receptions are made via two transmissions each from two transmitting elements comprising one element of each subset, and the reception of transmissions from each of these two transmitting elements by each of two receiving elements, the two receiving elements being different elements than the two transmitting elements. From these last measurements a complex calibration ratio for all of the elements being calibrated with respect to a single element is determined. For calibration in the transmit mode, this same procedure is followed, but the transmissions become receptions and the receptions become transmissions. | 06-21-2012 |
20120188116 | CALIBRATION OF ACTIVE ELECTRONICALLY SCANNED ARRAY (AESA) ANTENNAS - The present invention concerns an active electronically scanned array antenna comprising: an active array, configured for radiating/receiving radiofrequency signals through first radiating openings that lie on a ground plane; and a dielectric cover arranged at a given distance from the ground plane so that between said dielectric cover and said ground plane an air gap is present. Said active electronically scanned array antenna is characterized in that it further comprises one or more calibration devices operable for calibrating said active electronically scanned array antenna, each calibration device comprising a respective radiating portion arranged between the dielectric cover and the ground plane and configured for receiving radiofrequency signals radiated through corresponding first radiating openings and for radiating radiofrequency signals in the air gap towards said corresponding first radiating openings. | 07-26-2012 |
20120206291 | BENCH-TOP MEASUREMENT METHOD, APPARATUS AND SYSTEM FOR PHASED ARRAY RADAR APPARATUS CALIBRATION - A method for determining beamformer scattering parameters for a plurality of phased array radar antenna subarrays that each include a radiating (e.g., dipole) component and a beamformer component provides for obtaining for the plurality of phased array radar antenna subarrays a plurality of electromagnetic measurements at a plurality of ports. Analogous electromagnetic measurements are obtained for a reference subarray including a radiating component but absent a beamformer component. The plurality of phased array radar antenna subarray electromagnetic measurements and the reference subarray electromagnetic measurements provide a plurality of beamformer scattering parameter values for the plurality of phased array radar antenna subarrays that may be used in modeling and calibrating a phased array radar apparatus that may be assembled from the plurality of phased array radar antenna subarrays. | 08-16-2012 |
20120256785 | SYSTEMS AND METHODS FOR CALIBRATING DUAL POLARIZATION RADAR SYSTEMS - A dual polarization radar system is calibrated based on real-time data measurements, such as measured horizontal and vertical reflectivities, Z | 10-11-2012 |
20120280856 | RADAR - A radar receiver having an antenna. The antenna has an array of antenna elements. The receiver also includes a number of processing stages including a first processing stage adapted to process radar signals received via each antenna element of the array and a second processing stage adapted to serve the first processing stage. The processing stages are each arranged substantially parallel to one another, and to the antenna substrate. | 11-08-2012 |
20120293362 | PHASE-ARRAYED DEVICE AND METHOD FOR CALIBRATING THE PHASE-ARRAYED DEVICE - A phase-arrayed device includes: a signal processing circuit arranged to generate a specific signal; a first phase-arrayed channel arranged to provide a first phase-arrayed signal according to the specific signal; a first conducting path arranged to conduct the specific signal to the first phase-arrayed channel; a second conducting path arranged to conduct the first phase-arrayed signal to the signal processing circuit; and a detecting circuit, arranged to detect a mismatch between the first phase-arrayed signal and a reference signal to generate a detecting signal utilized for calibrating the first phase-arrayed signal. | 11-22-2012 |
20120299769 | METHOD AND DEVICE FOR ANTENNA CALIBRATION - A method for antenna calibration is provided, which includes the following steps: obtaining an updated calibration period T_i after the last time of antenna calibration (S | 11-29-2012 |
20130016003 | BEAM FORMING DEVICE AND METHOD USING FREQUENCY-DEPENDENT CALIBRATIONAANM STIRLING-GALLACHER; RichardAACI DallasAAST TXAACO USAAGP STIRLING-GALLACHER; Richard Dallas TX USAANM TESTAR; MiquelAACI StuttgartAACO DEAAGP TESTAR; Miquel Stuttgart DEAANM DAYI; FurkanAACI StuttgartAACO DEAAGP DAYI; Furkan Stuttgart DEAANM BOEHNKE; RalfAACI EsslingenAACO DEAAGP BOEHNKE; Ralf Esslingen DEAANM BLECH; MarcelAACI HerrenbergAACO DEAAGP BLECH; Marcel Herrenberg DEAANM WANG; QiAACI StuttgartAACO DEAAGP WANG; Qi Stuttgart DE - A beam forming device that enables the use for wideband digital beam forming and provide a high accuracy a beam forming device comprises a transmitter arrangement and a receiver arrangement, wherein the total number of transmit antennas and receive antennas is at least three. A beam forming unit performs beam forming to obtain beam formed output signals from said receive signals by use of corrected beam forming weights. A correction unit corrects preliminary beam forming weights in amplitude and/or phase by use of frequency-dependent final calibration coefficients representing the different amplitude and/or phase responses of the different channels between said at least one transmit antenna and said at least one receive antenna at two or more separate frequencies covered by the radiation transmitted towards the scene. | 01-17-2013 |
20130088382 | CALIBRATION METHOD FOR AUTOMOTIVE RADAR USING PHASED ARRAY - Examples of the present invention include calibration methods for phased array radar apparatus. The calibration methods include an electronic calibration of phase shifters, and compensation for mechanical misalignment. Approaches are particularly useful for automotive radar, and may be used for initial calibration after installation on a factory line, or at later times such as at a service station whenever recalibration becomes necessary. | 04-11-2013 |
20130113652 | METHOD OF COMPENSATING SUB-ARRAY OR ELEMENT FAILURE IN A PHASED ARRAY RADAR SYSTEM, A PHASED ARRAY RADAR SYSTEM AND A COMPUTER PROGRAM PRODUCT - The invention relates to a method of compensating sub-array or element failure in a phased array radar system. The method comprises the step of defining a virtual array comprising a multiple number of virtual transceiver tiles preferably arranged halfway all connection lines interconnecting a transmitter tile to a receiver tile. Further, the method comprises the steps of performing phased array radar measurements, and estimating radar data associated with a first transmitter/receiver combination by using radar data associated with a second transmitter/receiver combination, wherein the virtual transceiver tile of the first transmitter/receiver combination substantially coincides with the virtual transceiver tile of the second transmitter/receiver combination. | 05-09-2013 |
20130135139 | CALIBRATION DEVICES AND CALIBRATION METHODS - A calibration device, capable of calibrating a gain of a radiometer, includes an actuator and a micro-electromechanical-system (MEMS) unit. The actuator receives a calibration signal outputted from a control unit. The MEMS unit is coupled to the actuator, in which the actuator enables the MEMS unit to shield an antenna of the radiometer according to the calibration signal, such that the radiometer generates an environmental signal according to an equivalent radiant temperature received from the MEMS unit, and the control unit calibrates the gain of the radiometer according to the environmental signal. | 05-30-2013 |
20130214965 | Obtaining a Calibration Parameter for an Antenna Array - Embodiments herein include a method for obtaining a calibration parameter for an antenna array. The antenna array comprises a first and a second radio module with respective associated antennas, wherein both radio modules comprise a main transmitter and a connected calibration receiver or both radio modules comprise a main receiver and a connected calibration transmitter. The method comprises: injecting a first calibration signal in the first radio module and measuring a first response to the first calibration in the first radio module. This injecting and measuring is repeated for all combinations of the first and second radio modules. Finally, a numerical value is calculated using the responses; a calibration parameter is calculated based on the calculated numerical value. Embodiments herein also include a corresponding antenna array, computer program and computer program product. | 08-22-2013 |
20130234883 | Apparatus and Method for an Active Antenna System with Near-field Radio Frequency Probes - Field-serviceable radio frequency modules can be achieved by replacing hard-wired radio frequency (RF) feedback paths with external near-field RF probes. Notably, the near-field RF probes may allow for the RF module to be installed/re-installed on a backplane or other support structure without fowling factory calibration settings. Multiple near-field RF probes can monitor a single RF module. Additionally, a single near-field RF probe can monitor multiple RF modules. | 09-12-2013 |
20130293409 | METHOD AND APPARATUS FOR POWER LOSS COMPENSATION AND SUPPRESSION OF SIDELOBES IN ANTENNA ARRAYS - An antenna array for the transmission of signals is disclosed which comprises a plurality of antenna elements connected to a plurality of transceivers. The plurality of transceivers receive transceiver signals for transmission to the plurality of antenna elements. The antenna comprises a failure detector or monitoring and control system connected to the plurality of transceivers, which autonomously detects malfunction of the individual transceivers and reports this to the signal processor without involvement of the transmitter and receiver. The antenna array also comprises a signal processor connected to the plurality of transceivers and adapted to weight using complex values the transceiver signals for automatically compensating for power losses by tilt adjustments and for interference by suppression of sidelobes of the signals based on the information from the failure detector or monitoring and control system. | 11-07-2013 |
20130321197 | CALIBRATION TO IMPROVE WEATHER RADAR POSITIONING DETERMINATION - A method of calibrating antenna-position detection associated with a radar system, the radar system including a first gimbal and a first angle sensor configured to detect an angular position of the first gimbal, includes mounting a second angle sensor to the first gimbal configured to detect an angular position of the first gimbal. The first gimbal is rotated through each angular position of a set of the angular positions. A first set of data is generated with the first angle sensor that characterizes a detected angular position of the first gimbal. A second set of data is generated with the second angle sensor that characterizes a detected angular position of the first gimbal. A third data set is determined comprising differences, between the first and second data sets, in detected angular position at each first-gimbal angular position. The third data set is stored in a memory device. | 12-05-2013 |
20140035779 | Highly accurate calibration of microwave radiometry devices - Systems and methods are disclosed for highly accurate calibration of microwave radiometry devices by defeating reflections from a cryogenic blackbody calibration target and, further, defeating a standing wave established between reflecting features at the device and at the blackbody calibration target. The preferred disclosed system includes adaptations for effective Brewster angle presentation of radiation emanating from the target to the radiometry device. Other embodiments are taught for substantially eliminating or randomizing the standing wave in both wavelength dependent and independent applications. | 02-06-2014 |
20140111373 | Calibration System and Technique For A Scalable, Analog Monopulse Networks - Described is a calibration technique for an Active Electronically Scanned Array (AESA) having a scalable, analog monopulse network. | 04-24-2014 |
20140145874 | Device having a Voltage-Controlled Oscillator and a Switching Arrangement for Self-Calibration - A device, particularly a radar sensor, has a voltage-controlled oscillator for generating a high-frequency signal which has an actual frequency, a voltage adjusting device to control the oscillator, and a calibration device operable for adjusting a voltage value which is assigned to a value of a target frequency. The calibration device is operable for finding a difference between a frequency and the target frequency corresponding to the voltage set at the oscillator. The calibration device is also operable for generating a low-frequency signal from the high-frequency signal, determining the oscillation period of the low-frequency signal, calculating an auxiliary frequency from the oscillation period of the low-frequency signal, wherein the auxiliary frequency corresponds to the actual frequency of the high-frequency signal, and for adjusting the voltage value assigned to the target frequency according to the frequency difference between the auxiliary frequency and the target frequency. | 05-29-2014 |
20140210661 | SYSTEMS AND METHODS FOR CALIBRATING DUAL POLARIZATION RADAR SYSTEMS - A dual polarization radar system is calibrated based on real-time data measurements, such as measured horizontal and vertical reflectivities, Z | 07-31-2014 |
20140247182 | METHOD, SYSTEM AND CALIBRATION TARGET FOR THE AUTOMATIC CALIBRATION OF AN IMAGING ANTENNA ARRAY - The system is used for the automatic calibration of an imaging array using an evaluation unit. The array transmits signals and receives the signals reflected from a calibration object of known shape. The calibration object provides at least one diffuse reflector. In the evaluation method, position coordinates of the calibration object are entered, and the following method steps are implemented after the measurement of the reflected signals: (i) calculate the reflections of the calibration object, (ii) calculate calibration data, (iii) prepare an image of the calibration object with the use of the calibration data, (iv) determine corrected position coordinates by evaluating the image of the at least one diffuse reflector, and (v) implement steps (i) to (iv) with corrected position coordinates. | 09-04-2014 |
20140266865 | System And Method For Calibration And Built-In Self Test Of Automobile Radar System - An I/Q mixer and processing method for a radar system include an RF input and an LO input. Phase shifters apply a selectable phase shift to the LO signal to produce a first phase-shifted version of the LO signal and a second phase-shifted version of the LO signal, the first and second phase-shifted versions of the LO signal being in quadrature. A first set of switches is controllable to selectively apply the selectable phase shift to the LO signal. A first mixer unit receives the RF signal at a first input of the first mixer unit, and a second mixer unit receives the RF signal at a first input of the second mixer unit. A second set of switches is controllable to apply one of the first and second phase-shifted versions of the LO signal to one of a second input of the first mixer unit and a second input of the second mixer unit and to apply the other of the first and second phase-shifted versions of the LO signal to the other of the second input of the first mixer unit and the second input of the second mixer unit. A counter generates a count for sequencing through states of the first and second sets of switches. | 09-18-2014 |
20140333473 | METHOD AND DEVICE FOR ASCERTAINING AND COMPENSATING FOR A MISALIGNMENT ANGLE OF A RADAR SENSOR OF A VEHICLE - A method for ascertaining and compensating for a misalignment angle of a radar sensor of a vehicle, includes generating a first set of data which contains information about a measured alignment of the radar sensor with respect to an instantaneous movement of the vehicle; generating a second set of data which contains information about a measured alignment of the reference axes defined at the vehicle with respect to the instantaneous movement of the vehicle; ascertaining a misalignment angle by comparing the generated first set of data to the generated second set of data; compensating for the ascertained misalignment angle by changing an emission direction of the main lobe of the antenna characteristic as a function of the ascertained misalignment angle. | 11-13-2014 |
20140333474 | AUTOMATED CALIBRATION OF MULTISTATIC ARRAYS - A method is disclosed for calibrating a multistatic array having a plurality of transmitter and receiver pairs spaced from one another along a predetermined path and relative to a plurality of bin locations, and further being spaced at a fixed distance from a stationary calibration implement. A clock reference pulse may be generated, and each of the transmitters and receivers of each said transmitter/receiver pair turned on at a monotonically increasing time delay interval relative to the clock reference pulse. Ones of the transmitters and receivers may be used such that a previously calibrated transmitter or receiver of a given one of the transmitter/receiver pairs is paired with a subsequently un-calibrated one of the transmitters or receivers of an immediately subsequently positioned transmitter/receiver pair, to calibrate the transmitter or receiver of the immediately subsequent transmitter/receiver pair. | 11-13-2014 |
20140368376 | CALIBRATION SCHEME FOR GAS ABSORPTION SPECTRA DETECTION - A technique for removing the background from a transmission spectrum including determining performance characteristics of a detector, measuring a transmission spectrum that includes an absorption line, determining performance characteristics of a gas cell, and removing a background spectrum from the transmission spectrum by combining the transmission spectrum with the performance characteristics of the detector and the performance characteristics of the gas cell. | 12-18-2014 |
20150070207 | Method and Apparatus For Self Calibration of A Vehicle Radar System - A radar sensor for use within a vehicle includes self calibration functionality for performing angle calibrations for the sensor when the sensor is mounted within the vehicle. In at least one embodiment, the radar sensor collects information on stationary infrastructure around the vehicle for use in calibration operations. The infrastructure information may be used to generate a Doppler Monopulse Image (DMI) or other graph for the sensor. A clutter ridge within the DMI or other graph may then be analyzed to determine calibration data for the sensor. | 03-12-2015 |
20150301159 | Method for calibrating a radar sensor, and radar system - A method, and corresponding radar system, for calibrating a radar sensor, including: placing at least one reference object at a predetermined position in the field of view of the radar sensor; sensing an estimated position of the at least one reference object by way of the radar sensor; calculating a correction value for the position of the at least one reference object based on the predetermined position of the at least one reference object and on the estimated position, sensed by the radar sensor, of the at least one reference object; and applying the calculated correction value to estimated positions, sensed by the radar sensor, of further objects in the field of view of the radar sensor. | 10-22-2015 |
20150357710 | ANTENNA APPARATUS AND ANTENNA DIRECTION CONTROL METHOD - An antenna apparatus includes transmitting elements arranged on a first circle and transmit an electromagnetic wave having OAM, a calibration transmitting element disposed at a center of the first circle and transmits a calibration electromagnetic wave without OAM, at least three calibration receiving elements disposed at regular intervals on a second circle, and a plurality of receiving elements disposed on the second circle or a third circle disposed with the second circle in a concentric fashion, wherein an angle of a central axis of the second circle is adjusted so that phases of the calibration electromagnetic wave received at all of the calibration receiving elements match with each other, and wherein an angle of a central axis of the first circle is adjusted so that phase differences of the electromagnetic wave having OAM received by the two adjacent calibration receiving elements among all of the calibration receiving elements are minimized. | 12-10-2015 |
20160025841 | SYSTEMS AND METHODS FOR CALIBRATING DUAL POLARIZATION RADAR SYSTEMS - A dual polarization radar system is calibrated based on real-time data measurements, such as measured horizontal and vertical reflectivities, Z | 01-28-2016 |
20160033625 | PHASE CALIBRATION CIRCUIT AND METHOD FOR MULTI-CHANNEL RADAR RECEIVER - This invention describes circuits and methods which can allow multiple radar receiver chips to be adjusted to have very low phase offset between them. Multiple receiver chips are used in frequency-modulated carrier-wave (FMCW) radar systems for beamforming to enable angle-of-arrival measurements. FMCW radar systems are widely used in collision-avoidance and adaptive cruise control systems in vehicles, which today are operating in the 76-81 GHz frequency band. In a multi-receiver system, each receive element must have a well-controlled phase response which can be calibrated over process, voltage, and temperature. Without calibration, phase offsets can result in erroneous beamforming receiver measurements. The inventive circuit provides a technique to adjust the phase of multiple receivers across multiple chips using a single local oscillator reference and built-in-test circuitry which consist of phase shifters, a multi-frequency nonlinear phase detection circuit, and power coupling circuits. | 02-04-2016 |
20160116574 | GROUND-BASED GEO-REFERENCED INTERFEROMETRIC RADAR - A system and method for geo-referencing a main measuring instrument which operates in an Instrument Coordinate System. The method includes the steps of deploying the main measuring instrument on a deployment surface. An auxiliary measuring instrument is used to measure the position of a plurality of external reference points in a Master Coordinate System as well as a plurality of local reference points on the main measuring instrument in the Master Coordinate System. An inclinometer associated with the main measuring instrument, obtains an orientation reading for the deployed main measuring instrument. A processor then uses the orientation reading and the measured positions of the external reference points and the local reference points on the main measuring instrument, to geo-reference the main measuring instrument so that measurements made therewith are automatically output in the Master Coordinate System. | 04-28-2016 |
20160124076 | RADAR APPARATUS, METHOD FOR INSPECTING AXIS DEVIATION THEREOF, AND COMPUTER-READABLE RECORDING MEDIUM WITH PROGRAM RECORDED THEREON - A radar apparatus generates a spectrum distribution where frequencies in a beat signal are associated with intensities of respective frequency components. Based on a plurality of spectrum distributions generated over a predetermined number of measurement cycles prescribed in advance, the radar apparatus generates a reflection intensity distribution where frequencies are associated with road surface reflection intensities of the radar wave from a road surface at each frequency. In the reflection intensity distribution, the radar apparatus detects an intensity peak indicating a frequency that maximizes the road surface reflection intensity. Based on the detected intensity peak, the radar apparatus determines at least whether or not the radar apparatus is in an axis deviation state that is taken as a state where a reference axis of the radar apparatus has an inclination of not less than a prescribed angle in a vehicle height direction relative to a horizontal axis prescribed to a vehicle. | 05-05-2016 |
20160139247 | RADAR SIGNAL PROCESSING METHOD AND APPARATUS FOR COMPENSATING FOR IN-PHASE/QUADRATURE-PHASE (I/Q) IMBALANCE - Provided is a radar signal processing method and apparatus for compensating for an in-phase/quadrature-phase (I/Q) imbalance, the method including extracting a real part of a radar signal in which an I/Q imbalance occurs through a conversion of an in-phase (I) channel signal of the radar signal, extracting an imaginary part of the radar signal through a conversion of a quadrature-phase (Q) channel signal of the radar signal, extracting an error due to the I/Q imbalance based on the real part and the imaginary part, and outputting a correction signal obtained by compensating for the I/Q imbalance of the radar signal based on the error. | 05-19-2016 |
20160161597 | Determination of an elevation misalignment angle of a radar sensor of a motor vehicle - A method for identifying an elevation misalignment angle of a radar sensor of a vehicle, including: identifying elevation angles of radar object localizations with reference to a coordinate system of the radar sensor, an elevation angle of a radar object localization being respectively identified based on radar echoes that are obtained with at least two antenna directional characteristics that differ in an elevation direction; and identifying an elevation misalignment angle based on an occurrence frequency distribution of the elevation angles of at least some of the radar object localizations; and a radar sensor for vehicles having an evaluation device embodied to carry out the method. | 06-09-2016 |
20160380711 | CALIBRATION NETWORK FOR A PHASED ARRAY ANTENNA - A calibration network system for an array antenna and method for calibrating of the array antenna are described. The system includes a pair of rectangular waveguides stacked in parallel relation to each other and spaced apart at a distance of a quarter of an operating wavelength. The rectangular waveguides includes through-holes extending through a side-wall of the stacked rectangular waveguides from a bottom of a lower waveguide to a top of an upper waveguide to accommodate coaxial transmission lines. The side-wall has openings between the through-holes and an interior region of the rectangular waveguides in order to provide coupling of the coaxial transmission lines into the pair of rectangular waveguides. The system includes 90 degree phase shifter coupled to the upper rectangular waveguide, and a power divider/combiner coupled to a reference T/R Module, to the 90 degree phase shifter and to the lower rectangular waveguide. | 12-29-2016 |
20170234971 | PHASE CALIBRATION DEVICE FOR A PLURALITY OF TRANSMISSION ANTENNAS | 08-17-2017 |
20180024228 | AUTOMATED VEHICLE RADAR SYSTEM WITH AUTO-ALIGNMENT FOR AZIMUTH, ELEVATION, AND VEHICLE SPEED-SCALING-ERROR | 01-25-2018 |
20180026690 | TRANSMISSION CONTROL DEVICE, RADIO COMMUNICATION SYSTEM, AND CALIBRATION METHOD | 01-25-2018 |
20190146768 | VEHICLE RADAR SETTING METHOD | 05-16-2019 |
20190148829 | BEAMFORMING CALIBRATION | 05-16-2019 |