Class / Patent application number | Description | Number of patent applications / Date published |
342442000 | Having a phase detector | 27 |
20080316104 | Apparatus and Method for Computing Location of a Moving Beacon Using Received Signal Strength and Multi-Frequencies - Provided is an apparatus and method for computing the location of a radio beacon by using received signal strength (RSS) and multiple frequencies. The apparatus and method of the present invention computes the location of a radio beacon without limitation in distance by using multiple frequencies and received signal strength to resolve the problem of phase ambiguity. A radio beacon location computing system includes a plurality of base stations configured to receive signals of multiple frequencies transmitted from the radio beacon, and detect and output phase differences and received signal strength; and a location computing server configured to receive the phase differences and the received signal strength outputted from the respective base stations, acquire calculation distances based on the phase differences, remove phase ambiguity from the calculation distances based on the received signal strength, and compute the location of the radio beacon. | 12-25-2008 |
20080316105 | Method and Apparatus For Transmitter Locating Using a Single Receiver - Provided is a method and apparatus for locating a transmitter. The apparatus for locating a transmitter, including: an antenna having an antenna array for receiving first and second frequency signals transmitted from the transmitter and measuring an angle of the transmitter; a range of transmission (ROT) calculating unit for calculating the range of transmission of the transmitter based on phase difference between the first and second frequency signals; an angle of arrival (AoA) calculating unit for calculating the angle of the transmitter based on phase difference of common frequency signals received in the antenna; and a transmission location determining unit for determining the location of the transmitter based on the range of transmission and the angle of arrival of the transmitter. | 12-25-2008 |
20090027272 | SYSTEM AND METHOD TO POSITION REGISTER AND PHASE SYNCHRONIZE A MONITORING NETWORK - A system is disclosed for position registration and phase synchronization of monitors in a monitor network. Each monitor includes a transceiver having a transponder circuit with a calibrated transponder delay. To measure a distance between monitors, an oscillator at a first monitor generates a measurement signal which is transponded by a second monitor for receipt by the first monitor. A phase difference between the received signal and the first monitor oscillator is determined and used with the signal velocity and transponder delay to calculate the distance between monitors. The measured distances are combined with other data (e.g. monitor elevations) to calculate monitor locations. A phase delay is then measured by transmitting a signal from the first to the second monitor for comparison with the second monitor oscillator. A phase difference between oscillators (for use in synchronizing the monitors) is then calculated using the phase delay, separation distance and signal velocity. | 01-29-2009 |
20090195457 | METHODS AND SYSTEM FOR DETERMINING ANGLES OF SIGHT BETWEEN TWO DEVICES - A method of determining angles of sight between a receiver device having at least two reception antennas and at least one transmitter device having at least one transmission antenna for the transmission of radioelectric signals including at least two wavelengths. The determining method is based on angular phase measurements of the radioelectric signals, which are measured modulo 2π and are therefore ambiguous since they are known to within an integer number of times 2π. The ambiguity in the phase measurements is resolved in the case of an application of the determining method to a receiver device dimensioned by applying a method of design of a system for determining angles of sight. A receiver device implements the determining method and a system for determining angles of sight includes the receiver device and at least one transmitter device. | 08-06-2009 |
20100013711 | Determining a position of a tag - A tag transmits signals having at least two different frequency components. The signals are receivable by at least some of a plurality of spaced receivers. Each receiver, in response to receiving a signal, measures respective phases of the first and second frequency components and a frequency offset between the tag and the receiver. The frequency offset is dependent upon a difference in frequencies of respective clocks in the tag and the receiver. A position processor obtains a difference in phases of the first and second frequency components for a signal, a frequency offset between the receiver and tag and determines the position of the tag in dependence upon the difference between respective phases of the first and second frequency components and in dependence upon the frequency offset. | 01-21-2010 |
20100097270 | RECEIVING APPARATUS, MOVING ANGLE ESTIMATION METHOD, PROGRAM AND WIRELESS COMMUNICATION SYSTEM - A receiving apparatus is provided that includes a plurality of antennas, a phase difference calculation unit to calculate a phase difference of a received signal between the plurality of antennas, a difference calculation unit to calculate a difference between the phase difference of a previous received signal and the phase difference of a new received signal calculated by the phase difference calculation unit, and a moving angle estimation unit to estimate a moving angle of a transmitting apparatus from the difference in phase difference calculated by the difference calculation unit. | 04-22-2010 |
20100109951 | BEAM FORMER USING PHASE DIFFERENCE ENHANCEMENT - Noise discrimination in signals from a plurality of sensors is conducted by enhancing the phase difference in the signals such that off-axis pick-up is suppressed while on-axis pick-up is enhanced. Alternatively, attenuation/expansion are applied to the signals in a phase difference dependent manner, consistent with suppression of off-axis pick-up and on-axis enhancement. Nulls between sensitivity lobes are widened, effectively narrowing the sensitivity lobes and improving directionality and noise discrimination. | 05-06-2010 |
20100220013 | POSITIONING SYSTEM - A high-precision positioning system including: a radio source ( | 09-02-2010 |
20100265138 | DETERMINING A DIRECTION OF ARRIVAL OF SIGNALS INCIDENT TO A TRIPOLE SENSOR - A system to determine a direction of arrival of each of a plurality of constituent signals of a superimposed wave includes a tripole radio antenna, a sampling unit, a frequency determining unit, an amplitude and phase determining unit, and a direction determining unit. The sampling unit is configured to periodically sample an output of the tripole radio antenna to generate at least two samples. The frequency determining unit is configured to determine frequencies for each dimension of the constituent signals by performing a unitary matrix pencil method on the at least two samples. The amplitude and phase determining unit is configured to determine x, y, z amplitudes and x, y, z phases for each constituent signal using the determined frequencies. The direction determining unit is configured to determine a direction of arrival for each of the constituent signals from the determined frequencies, amplitudes, and phases. | 10-21-2010 |
20110074633 | Methods and Systems for Estimating Angle of Arrival - Methods and systems for estimating an angle of arrival are provided. In an embodiment, a system for estimating angle of arrival includes a snapshot determining module configured to receive a signal from each antenna of an antenna array and to generate a snapshot vector including values based on the signals and an angle of arrival processing module configured to estimate an angle of arrival for the electromagnetic signal relative to the antenna array based on the snapshot vector. Each signal is representative of an electromagnetic signal incident on a respective antenna of the antenna array and each value is representative of a phase of a respective signal. | 03-31-2011 |
20110133988 | RADIO ARRIVAL DIRECTION ESTIMATION DEVICE AND RADIO ARRIVAL DIRECTION ESTIMATION METHOD - A radio arrival direction estimation device that accurately estimates the arrival direction of radio waves from a desired tag, even when there are multiple antennas disposed at short intervals. When ID detection timing is provided from a timing detector ( | 06-09-2011 |
20110199263 | METHOD AND APPARATUS FOR ESTIMATING ANGLE OF ARRIVAL - Provided is a method of an angle of arrival (AoA) estimating apparatus. The AoA estimating apparatus may obtain at least two candidate values for an AoA of a received signal, based on a first steering vector. The AoA estimating apparatus may further detect a second steering vector corresponding to a predetermined rotation angle to which the AoA estimating apparatus rotates, and may determine the AoA based on one of the at least two candidate values, with respect to the second steering vector and the predetermined rotation angle. | 08-18-2011 |
20110205123 | INTERFEROMETRIC METHODS AND SYSTEMS - An interferometer estimates at least one interferometric parameter of one or more signals emitted from a source. The interferometer has an array of antennas and at least one phase detector configured to determine a plurality of phase measurements of the one or more source signals. A combined estimator processes the plurality of phase measurements to provide estimates of at least one sought parameter, representing the at least one interferometric parameter, and at least one noise parameter associated with the plurality of phase measurements. A postprocessor processes estimates of the at least one sought parameter based on at least one noise parameter received from the combined estimator to improve an estimate of the at least one interferometric parameter. The combined estimator is configurable to produce a maximum likelihood estimate of the at least one sought parameter using at least one noise parameter calculated based on the plurality of phase measurements. | 08-25-2011 |
20110304508 | DIRECTION FINDING ANTENNA SYSTEM AND METHOD - An antenna system for estimating the DOA of arriving signals, comprising: a first omnidirectional antenna; and a second omnidirectional antenna, which is located coaxially above the first omnidirectional antenna at a predefined distance D. The first omnidirectional antenna is configured to transform the received arriving signal into output signals, and the second omnidirectional antenna is configured to transform the received signal into a reference signal. The antenna system allows extracting: a first phase difference between the phase of the first output signal and the reference phase and a second phase difference between the phase of the second output signal and the reference phase, where each phase difference includes a first component proportional to the azimuth of said arriving signal and a second component corresponding to the elevation of the arriving signal, from which the azimuth and the elevation of the arriving signal can be extracted. | 12-15-2011 |
20120026042 | Near-Vertical Direction Finding and Geolocation System - A system and method for geolocating an RF emitter disposed on or near the ground includes receiving a signal from the RF emitter at each antenna of an array of N non-collinear antennas, wherein N is an integer greater than 2; routing the signal received at each of the antennas to one of a bank of N corresponding receivers; downconverting the N received signals to N downconverted signals; digitizing the N downconverted signals to digitized signals on N corresponding channels; using a processor to determine phase and amplitude variations across the N channels and to determine a Direction Vector corresponding to the signal received from the RF emitter; using a 2-dimensional pre-determined calibration table to look up a best match to the Direction Vector to determine a Bearing Vector to the RF emitter; transforming the Bearing Vector into locally level reference frame; and geolocating the RF emitter by determining an intersection between the locally level reference frame Bearing Vector and a dataset containing local terrain data. | 02-02-2012 |
20120032851 | EMITTER LOCATION - The present invention relates to emitter location. More specifically, it relates to locating emitters using only their fundamental frequency information. | 02-09-2012 |
20120032852 | Precision Geolocation of Moving or Fixed Transmitters Using Multiple Observers - A method of geolocating a stationary transmitter observed by a fixed receiver device and at least two receiver devices, at least one of the receiver devices moving includes obtaining wavelength-scaled phase difference measurements between pairs of receiver devices, and 10 obtaining a result lattice of possible locations of the transmitter, one location more probable than the remainder. A method of geolocating a moving transmitter observed by a plurality of fixed or nearly fixed receiver devices, and a moving receiver device, includes obtaining wavelength-scaled phase difference measurements from the plurality of fixed or nearly fixed receiver devices to obtain a shape of the transmitter trajectory, measuring the phase difference 15 between the moving receiver device and at least one of the plurality of fixed or nearly fixed receiver devices to obtain a phase error residual, and moving an estimated starting point of the transmitter to obtain a best-fit residual. | 02-09-2012 |
20120075145 | POSITIONING SYSTEM AND METHOD BASED ON RADIO COMMUNICATION APPARATUS COMPRISING MULTIPLE ANTENNA - This disclosure relates to a positioning system and a method based on a radio communication apparatus including multiple antennas, and more particularly, to a positioning system and a method of positioning a terminal using a communication apparatus including multiple antennas. The positioning system and the method based on a radio communication apparatus including multiple antennas calculate a position of a terminal using a single communication apparatus in which the multiple antennas are mounted and can calculate the position of the terminal more accurately by using two or more communication apparatuses. In addition, the positioning system and the method communicate with a transception apparatus, a relay station, or a wireless access point of an existing communication system, thereby accurately obtaining the position of the terminal. | 03-29-2012 |
20120127035 | ELECTRICALLY SMALL, SOURCE DIRECTION RESOLVING ANTENNAS - An electrically small receiver system is provided. The receiver system includes a plurality of antennas and a signal processing circuit. The plurality of antennas includes a first antenna configured to receive a first signal and a second antenna configured to receive a second signal. The signal processing circuit includes a first resonant loop and a second resonant loop. The first resonant loop is mounted to receive the first signal from the first antenna. The second resonant loop is mounted to receive the second signal from the second antenna. The first resonant loop and the second resonant loop are coupled such that the first output signal and the second output signal are generated as a function of the first signal and the second signal. A phase difference between the first output signal and the second output signal is greater than a phase difference between the first signal and the second signal. | 05-24-2012 |
20120249371 | DIRECTIONAL RADIO-SIGNAL-DETECTION APPARATUS AND METHODS OF USE - An apparatus for direction-finding a received radio signal is disclosed. The receiving apparatus selectively receives on a predetermined frequency to match the transmitter frequency. The receiving apparatus comprises of two or three antennas, including one or two loop antennas that work in conjunction with a third reference antenna (whose phase does not vary when its orientation changes relative to the transmitter), such as a dipole, monopole or helical antenna. By comparing the phase between the antennas the direction of the incoming RF signal can be determined. In some embodiments, the windings of the two loop antennas are wound in reverse with respect to each other in order to substantially double the sensitivity of the signal-detection capabilities. | 10-04-2012 |
20130207844 | HYBRID DIRECTION IDENTIFYING APPARATUS AND METHOD - A hybrid direction apparatus and method that rapidly and accurately detects a direction of a radio signal source based on a direction detecting scheme by comparing an amplitude or signal strength, a virtual Doppler scheme, a phase difference comparison scheme while removing an ambiguity based on an amplitude or signal strength scheme, and identify a direction relatively precisely based on a phase difference scheme using only two antennas. Also, an arrival direction of a relative radio wave when an arrival direction of a radio wave is vertical to a single rotating axis may be precisely identified by mounting a directional antenna and a phase comparison antenna on the single rotating axis, and rotating the two antennas. | 08-15-2013 |
20130271323 | APPARATUS AND METHOD FOR FINDING THE DIRECTION OF SIGNAL SOURCE - The direction finding apparatus includes: a first and second antennas configured to receive radio signals respectively; a travel guide unit mechanically coupled with the first and second antennas and configured to provide a travel path along which the first and second antennas are linearly movable; a driver configured to provide a driving force for linearly moving at least one antenna of the first and second antennas in response to a driving control signal; a driving controller configured to provide the driving control signal, wherein the driving control signal is used to separate the first and second antennas from each other by a predetermined distance; and a direction finding unit configured to calculate an angle of arrival (AOA) of radio signals respectively received through the first and second antennas, based on the phase difference between the radio signals, and the predetermined distance. | 10-17-2013 |
20140104111 | METHOD FOR CALCULATING SPACING RATIO OF INTERFEROMETER ARRAY ANTENNA FOR DIRECTION FINDER - A method for calculating a spacing between antenna elements of an interferometer array antenna includes setting an azimuth of an instantaneous field of view and a distance between phase differences, and obtaining the number of phase difference lines and phase difference vectors with respect to the phase differences of the signals output in a phase comparator of a direction finder, performing a modular arithmetic for the phase difference vectors to obtain phase difference matrixes, obtaining a transformation matrix for linearly transforming the phase difference matrixes and performing the linear transformation using the transformation matrix, calculating a distance between the phase differences on a new axis generated by the linear transformation, and calculating an antenna spacing as an array spacing of the array antenna, the antenna spacing meeting that the distance between the phase differences is greater than a desired distance between phase differences. | 04-17-2014 |
20140118192 | SYSTEMS AND METHODS FOR IMPROVING BEARING AVAILABILITY AND ACCURACY - Systems and methods for improving bearing initialization for a pair of two-element antennas. An exemplary system includes two-element antennas mounted on the bottom and top of an aircraft fuselage, an output device, and a processing device. The processing device receives phase-difference information based on phase of signals received at each element of a two-element antenna, determines if the received phase-difference information is within a predefined low-confidence region, and initializes bearing if the phase-difference information is not within the low-confidence region or the phase-difference information from a predefined number of consecutively received signals meets a predefined consistency requirement. | 05-01-2014 |
20160047885 | Direction Finding Antenna Format - A method of direction finding (DF) positioning based on a simplified antenna platform format in a wireless communication network is proposed. A receiver receives antenna platform format information of a transmitter having multiple antenna elements. The antenna platform format information comprises an antenna platform format indicator, antenna platform position and orientation information, a number of antenna elements, and switching delay, phase center, and polarization information for each antenna element. The receiver receives a plurality of direction finding sounding signals transmitted from the transmitter via the multiple antenna elements. The receiver performs a DF algorithm based on the plurality of DF sounding signals and the antenna platform format information and thereby estimating a DF solution. Finally, the receiver determines its own location information based on the estimated DF solution. | 02-18-2016 |
20160146923 | ELECTRICALLY SMALL, RANGE AND ANGLE-OF-ARRIVAL RF SENSOR AND ESTIMATION SYSTEM - An RF emitter sensing device is provided comprising an antenna circuit and an estimator configured to output, for one or more incoming signals-of-interest (SoI), either or both of an estimated range to the emitter of each SoI, and estimates for one or more angles corresponding to the 3D angle-of-arrival (AoA) of each SoI, wherein: the antenna circuit has a plurality of ports that each output an output signal containing the one or more SoI, the antenna circuit including one or more multi-port antennas, each multi-port antenna having two or more ports, each multi-port antenna being configured to pick up a combination of one or more E-field signals and one or more H-field signals from each SoI, in a common volume of space. | 05-26-2016 |
20160187451 | SYSTEM AND METHOD FOR DIRECTIONALLY CLASSIFYING RADIO SIGNALS - A system for directionally classifying of a radio signal originating from an emitter. The system includes a receiving-station, which includes at least two antennas, a single-channel-receiver producing a first and a second received signals and a switch alternately coupling each of the antennas with the single-channel-receiver. The system further includes another receiving-station which includes another receiver, producing another received signal, coupled with a first other antenna. The system further includes directional-classifier which includes a phase-difference-detector, coupled with the single-channel-receiver and with said another receiver. The phase-difference-detector produces a first phase difference measurement when the switch couples one antenna with the single-channel-receiver. The phase-difference-detector further produces a second phase-difference-measurement when the switch couples the other antenna with the single-channel-receiver. The directional classifier subtracts the second phase-difference-measurement from the first-phase-difference measurement producing a phase-difference-estimate. The receiving station and the other receiving station are in relative motion one with respect to the other. | 06-30-2016 |