| Class / Patent application number | Description | Number of patent applications / Date published |
|---|
| 342442000 |
Having a phase detector
| 27 |
| 342422000 |
With self-orienting antenna pattern
| 10 |
| 342443000 |
Having a direction indicator
| 8 |
| 342445000 |
Having more than two antennas
| 8 |
| 342432000 |
With plural fixed antenna pattern comparing
| 7 |
| 342418000 |
Doppler | 5 |
| 20080211719 | MOBILE SPEED AND DOPPLER FREQUENCY ESTIMATION USING CYCLOSTATIONARITY - Embodiments of the invention exploit cyclostationarity of linearly modulated signals, transmitted through fading channels, to provide robust blind and data-aided mobile speed estimators. Embodiments of the invention utilize at least two methods of cyclic-correlation- and cyclic-spectrum-based methods and extension to space-time speed estimation at the base station in macrocells. In comparison with background art methods, the new estimators of the embodiments of the invention can be used without any need for pilot tones, and are robust to additive stationary noise or interference of any color or distribution. In addition, embodiments of the invention can also be implemented blindly, which can increase the data throughput. Performance results of the estimators of the embodiments of the invention are illustrated via extensive Monte Carlo simulation results. | 09-04-2008 |
| 20110057839 | Method and apparatus for passive geolocation using synthetic-aperture processing - Using in-phase and quadrature components of a received signal, spatial and temporal information is utilized to generate a maximum likelihood coefficient from the measured data to geolocate an emitter of unknown frequency. In one embodiment an iso-Doppler contour is generated having regions of high correlation to estimate location in which the maximum likelihood calculation uses two factors, one derived from a single aperture and one derived from bearing estimates, with the region of highest correlation corresponding to emitter location. Hypothesized in-phase and quadrature signals corresponding to an emitter location describe what the signals received at the aperture should be if the emitter is of a predetermined frequency and at a predetermined location, with these estimates used in the maximum likelihood algorithm. | 03-10-2011 |
| 20120098704 | METHODS AND SYSTEMS FOR SOURCE TRACKING - Methods and systems are provided herein for signal source tracking. A signal emitted over time from a moving source is a collection of small sub-signals that were emitted by the source at different positions along its path. If the source is traveling at a slower speed than the signal, the sub-signals will arrive at a given sensor in the same order that they were released. By identifying the locations and times of the releases of several of these sub-signals, the path and velocity of the moving source can be estimated. | 04-26-2012 |
| 20130009822 | METHOD AND APPARATUS FOR IMPLEMENTING HIGH FIDELITY DOPPLER PHASE AND TIME EFFECTS IN ADVANCED EW STIMULUS SYSTEMS - A high fidelity simulation of Doppler that may exactly replicate the phenomenology of the physical world. Compute the linear (Line of sight) kinematics (Slant Range, Radial Velocity, and Radial Acceleration) for each of a multiplicity of emitter-receiver pairs in accordance with exact 3D vector mathematics. Smoothly interpolate the linear kinematic parameters to produce accurate instantaneous values of these parameters at sample rates sufficient to produce negligible error effects in the presence of realistic aircraft maneuvers. Calculate the Doppler frequency, in accordance with well known physics, from the emitter carrier wavelength and a high sample rate. Calculate the Doppler effect as a differential phase (Doppler frequency×sample time) and apply the effect as incremental phase shifts to the carrier signal. | 01-10-2013 |
| 20160032897 | DETERMINING A YAW DIRECTION OF A WIND TURBINE - A method for determining a yaw direction of a wind turbine includes the following steps, receiving at a component of the wind turbine a signal broadcasted from a source, determining a direction from the component towards the source based on the received signal, determining the yaw direction of the wind turbine in relation to the determined direction towards the source is provided. Further, a wind turbine and a device as well as a computer program product and a computer readable medium are disclosed for performing the method. | 02-04-2016 |
| 342441000 |
Having a goniometer | 4 |
| 20080252526 | Multiparametric Direction Finding Method Comprising the Separation of the Incidence and Nuisance Parameters - Method of multi-parameter direction finding of several sources in an array of N sensors, comprising at least the following steps: a) choosing a parameter to be determined, or parameter of interest, b) expressing the direction vector in the form of a linear relation between the parameter of interest chosen and the secondary parameters b | 10-16-2008 |
| 20090073041 | 1D OR 2D GONIOMETRY METHOD OF DIFFUSE SOURCES - A goniometry method for one or several diffuse (or distributed) sources is disclosed. The sources or sources having one or more give directions and a diffusion cone. The sources are received by an array of several sensors. The method breaks down the diffusion cone into a finite number L of diffusers. A diffuser has the parameters (θ | 03-19-2009 |
| 20120086605 | METHOD OF DETERMINING THE DIRECTION OF ARRIVAL OF A HIGH-FREQUENCY ELECTROMAGNETIC WAVE - A method of measuring the direction of arrival θ of radio signals in the HF band received by a crossed loop antenna includes, in a preparatory calibration phase, acquiring and recording the measurements made by the antenna of a calibration signal which varies in its frequency and bearing angle; and in a measurement phase in which the bearing angle or angles of arrival of signals detected by the antenna is or are determined, acquiring the signals detected in at least one frequency channel, and then, for each frequency channel f | 04-12-2012 |
| 20120242543 | MULTI-CHANNEL RECEPTION SYSTEM - A reception system including a receiver coupled to a processing means, the receiver comprising a number N of antennas, each being able to pick up signals representative of incident waves and to deliver a pulse dependent on said signal, N being an integer. Said receiver includes: N delay lines respectively coupled to each of said N antennas, each delay line being able to delay the signal delivered by the antenna with which it is associated by its own time delay, a coupling means able to sum the N signals delivered by the N delay lines, so as to deliver an output signal comprising a series of N time-shifted pulses. The processing means includes a measurement means able to measure the signal delivered by the coupling means and to deliver as output a signal formed by measurement samples, representative of the N pulses delivered by the N antennas. | 09-27-2012 |
| 342444000 |
Having plural receivers | 3 |
| 20100315292 | DIRECTION OF ARRIVAL ESTIMATION APPARATUS AND METHOD THEREOF - An apparatus for estimating a Direction of Arrival (DOA) of a wideband includes a first signal receiving unit and a second signal receiving unit to receive a wideband signal while satisfying d≦Mc/2f | 12-16-2010 |
| 20100321241 | LOCATIONING OF COMMUNICATION DEVICES - Techniques are disclosed for detecting, identifying, and/or geolocating RF communications devices, such as FRS radios, high-power cordless phones, cellular phones, and other wireless communications receiver devices. The techniques exploit a vulnerability present in such devices, and can be used to detect (e.g., up to 300 meters) and geolocate (e.g., within ±3 meters) those devices. The vulnerability is that receiver circuitry of the target devices emanate RF mixing products when flooded with RF energy or suitable stimulus signal. Such a response to a stimulus signal is unexpected or otherwise unintentional, as receiver circuitry is generally not designed to transmit information. The RF frequency, phase, and amplitude of these sideband RF responses can be used to detect and location the devices. The techniques work in the presence of interference, and can be used on devices that are powered on or off. | 12-23-2010 |
| 20140152506 | LOCATING DEVICE FOR LOCATING A SOURCE EMITTING A SHORT-DURATION HIGH POWER MICROWAVE PULSE - A locating device locates a source emitting a short-duration high power microwave pulse. The locating device contains at least three separately disposed receiving antennas that are not disposed on a line, each with an associated detection device for detecting the point in time of the reception at the antenna of the high power microwave pulse. At least one short time measurement device is provided for determining at least two time differences between the points in time of reception of each two of the detection devices. A computing device is provided for calculating a location of the origin of the high power microwave pulse based on at least two of the measured time differences. | 06-05-2014 |
| 342419000 |
Portable | 3 |
| 20090322616 | Radar echolocater with audio output - The echolocater device described herein incorporates the features of integrated sampling radar technology to create a unique device that provides, for example, the visually impaired with an excellent new tool to help navigate the world. Much like a bat using its bio-sonar, the visually impaired will be able to hear subtle differences in audio-replicated radar echoes. In one preferred embodiment of the invention, two integrated-sampling type radar receivers are spaced some convenient distance apart. A single transmitter centered between two receivers transmits pulses of an RF carrier. Audio “IF” output from each receiver is processed and sent to a small speaker worn near each ear. With practice the user of this invention will be able to discern the range, location and motion of individual objects, and may also be able to distinguish particular echo characteristics of differing objects. | 12-31-2009 |
| 20100026578 | Object locating apparatus, system and high-gain, high-selectivity antennae therefor - The invented system includes a beacon affixed to the object subject to loss and a tracker held by the owner of the lost object, the tracker repeatedly, electronically ‘interrogating’ the beacon with a radio frequency (RF) signal, the beacon repeatedly responding to the interrogation, and the tracker effectively triangulating to determine the lost object's nominal location by a measure of distance and direction. In accordance with one embodiment of the invention, the tracker includes one or more antenna each coupled with a power amplifier to determine in real time the distance and direction of the beacon from the tracker. In this embodiment, the tracker indicates both distance and direction of the object-affixed beacon to the tracker-holding owner via a simple color-coded light array. In one embodiment of the invention, the invented antenna of which there is one (or more) includes a helically wound conductor of elliptical cross section disposed around the hollow interior surface of a hollow mandrel. | 02-04-2010 |
| 20130321209 | METHOD, APPARATUS, AND COMPUTER PROGRAM PRODUCT FOR HIGH ACCURACY LOCATION DETERMINATION - Method, apparatus, and computer program product example embodiments provide short-range communication based location finding. According to an example embodiment of the invention, a method comprises receiving, by a first transceiver of an apparatus mounted on a moveable platform, from a remote device, one or more wireless packets including information packets containing angle of arrival information from the remote device, wherein the moveable platform is in motion relative to the remote device; determining in the apparatus, at least a first angle of arrival from the received angle of arrival information; and generating distance estimation data in the apparatus relative to the remote device, based on the determined first angle of arrival. | 12-05-2013 |
| 342420000 |
With error or deviatioan compensator or eliminator | 3 |
| 20100295732 | SYSTEM AND METHOD FOR REMOVING CHANNEL PHASE ERROR IN A PHASE COMPARISON DIRECTION FINDER - System and method for removing channel phase error in a phase comparison direction finder. By using this system, the phase error, generated in the channel path in finding the direction by using the phase comparison direction finder, can be injected into the receiving channel and removed by using the frequency and intensity of the signal stored in the PDW table. Furthermore, the direction finding correction look-up table can be made using only radiation correction of the antenna unit of the direction finder and channel correction can be carried out without calibrating the direction finder for the direction finding correction look-up table when devices are replaced in the channel of receiving path of the direction finder. | 11-25-2010 |
| 20110025563 | METHOD FOR MEASURING INCOMING ANGLES OF COHERENT SOURCES USING SPACE SMOOTHING ON ANY SENSOR NETWORK - A method for interpolating steering vectors a(θ) of a sensor network, the sensor network receiving signals transmitted by a source, characterized in that, for the interpolation of the steering vectors a(θ), use is made of one or more omnidirectional modal functions z(θ) | 02-03-2011 |
| 20110291892 | METHOD OF DETERMINING THE DIRECTION OF ARRIVAL OF AN ELECTROMAGNETIC WAVE - A method of measuring the bearing angle of arrival θ of HF band electromagnetic signals received by a crossed loop antenna or an Adcock antenna array includes measuring the phase difference Δφ between the signals acquired in the sine and cosine paths of the antenna; measuring the ratio R of the amplitudes of the signals acquired in the sine and cosine paths of the antenna; and determining the bearing angle of arrival θ of the wave as a function of the phase difference Δφ and the ratio R. The method is applicable to the detection and location of electromagnetic signal transmitters, particularly in the maritime field. | 12-01-2011 |
| 342448000 |
Having a coil or loop type antenna | 3 |
| 20110018768 | ADAPTATION OF A DIRECTIONAL CHARACTERISTIC OF A RADIO SIGNAL BASED ON THE SPATIAL ORIENTATION OF A RADIO TRANSMITTER - It is described an open-loop transmit coil diversity scheme, intended for communication based on magnetic induction, wherein the diversity scheme automatically aligns the transmit coil ( | 01-27-2011 |
| 20140049428 | DIRECTIONAL RADIO SIGNAL DETECTION APPARATUS USING A SENSE AND LOOP ANTENNAS - An apparatus for direction finding a received radio signal is enclosed. The receiving apparatus selectively receives on a predetermined frequency to match the transmitter frequency. The receiving apparatus is comprised of one non directional antenna and two or more loop antennas. The loop antennas modify the field of the incident radio signal by absorbing the incident radio frequency energy to create a non-ambiguous gain pattern on the sense antenna that can be used to determine the direction of the incident RF signal. | 02-20-2014 |
| 20160061927 | Identification method and identification system for an object's passing route direction - An identification method comprising: when an object is in a whole process from entering to separating from a region inducted by the low-frequency electromagnetic field, receiving the low-frequency signal of the low-frequency electromagnetic field in real time; extracting the attribute code and signal intensity corresponding to the low-frequency signal received and conducting associate storage; and after the object separates from the region inducted by the low-frequency electromagnetic field, determining the route direction along which the object passes through the vector beacons according to the attribute code and signal intensity stored. | 03-03-2016 |
| 342449000 |
Having a moving antenna | 3 |
| 20120229339 | METAMATERIAL-BASED DIRECTION-FINDING ANTENNA SYSTEMS - Method embodiments are disclosed to determine arrival directions of electromagnetic signals that have a known signal frequency and a known guided signal wavelength. These methods are realized with an antenna configured to define, at the signal frequency, at least one metamaterial cell between first and second signal ports. They then include the step of rotating the antenna until the differential power from the first and second signal ports is substantially zero and then determining the arrival direction as a normal to the metamaterial cell. In other method embodiments, the antenna is stationary and a differential power is determined wherein the differential power is defined as the difference between received powers from the first and second ports. The arrival direction of electromagnetic signals are then determined from the differential power. | 09-13-2012 |
| 20150102963 | DIFFERENTIAL SIGNAL STRENGTH DETERMINATION SYSTEMS AND METHODS - A differential signal strength direction determination systems (DSSDDS) may be programmed to provide an output that will enable an individual to determine a direction in which a source of a signal of interest is located with increased accuracy. The programming of the DSSDSS may improve accuracy by consolidating corresponding parts of a signal over time, by modifying a signal strength scale to enable an individual to better discern between the strengths of various signals and/or by providing a user-perceptible output that enables an individual to better discern between the strengths of various signals. | 04-16-2015 |
| 20150301152 | LOCALIZATION WITH NON-SYNCHRONOUS EMISSION AND MULTIPATH TRANSMISSION - Directional characterization of a location of a target device makes use of multiple radio transmissions that are received from the target device. In some examples, each radio transmission is received at a first antenna at a fixed location, and is also received at a second moving antenna. The received transmissions are combined to determine the directional characterization, for example, as a distribution of power as a function of direction. In some examples, the received radio transmissions are processed to determine, for each of a plurality of directions of arrival of the radio transmissions, a most direct direction of arrival, for example, to distinguish a direct path from a reflected path from the target. | 10-22-2015 |
| 342428000 |
With continuously movable antenna pattern | 2 |
| 20130278464 | METHOD AND APPARATUS FOR DIRECTIONAL PROXMITY DETECTION - A method and apparatus to facilitate directional proximity detection by a wireless device. In one embodiment of the invention, the wireless device has a phased array antenna system that facilitates the directional detection of other wireless device(s). For example, in one embodiment of the invention, the phased array antenna system of the wireless device uses a radiation pattern beam that circumrotates the wireless device to detect the proximity and location of other wireless devices. In another example, in one embodiment of the invention, the wireless device uses a search strategy to optimize the process to detect the proximity and location of other wireless devices. The search strategy may adjust the radiation pattern beam to any desired angle to detect the proximity and location of other wireless devices. | 10-24-2013 |
| 20120256793 | SIMULTANEOUS RADIO DETECTION AND BEARING SYSTEM - Provided is a simultaneous radio detection and bearing system. More specifically, the radio detection and bearing system includes an RF conditioning subsystem having a plurality of First Frequency Range and Second Frequency Range signal receiving channels. The RF conditioning subsystem operable to combine First Frequency Range and Second Frequency Range signals as a first internal data stream. A coherent multi-channel digitizer subsystem is coupled to the RF conditioning system, the coherent multi-channel digitizer subsystem operable to generate a time domain snapshot of the first internal data stream. An audio recording subsystem is also coupled to the RF conditioning subsystem. A processor is coupled to the coherent multi-channel digitizer subsystem and the audio recording subsystem. The processor is operable to transform the time domain snapshot to a frequency spectrum and identify at least one signal above a threshold at a determined frequency, determine the bearing of the signal, and provide the determined frequency to the audio recording subsystem. The audio subsystem contemporaneously records the signal upon the determined frequency. An associated method of radio detection and bearing determination is also provided. | 10-11-2012 |
| Entries |
| Document | Title | Date |
|---|
| 20080224930 | Methods for locating transmitters using backward ray tracing - According to a method for localizing a transmitter inside a building, a transmitter emits rays which undergo multiple reflections with the walls, ceilings and floors of the building. Each of K receivers receives rays from the transmitter, and the receivers estimates the AOA (Angle of arrival), TOA (Time of Arrival) and power of each ray. At least one of the receivers uses a known blueprint of the building and material characteristics of the walls to localize the transmitter to a higher degree of accuracy by applying a backward ray tracing algorithm. | 09-18-2008 |
| 20080231512 | METHOD AND APPARATUS FOR UTILIZATION OF LOCATION DETERMINATION SIGNAL SAMPLES IN NOISY ENVIRONMENTS - An apparatus for location determination includes a location determination receiver configured to receive location determination signals, a location determination signal quality assessment component configured to assess a quality of received location determination signals, and a location determination processor responsive to an output of the location determination signal quality component. The apparatus determining a location of the location determination receiver based on the location determination signals that are received during time periods when the location determination signal meets or exceeds a location determination signal quality threshold. A method for location determination is also disclosed. | 09-25-2008 |
| 20080266177 | High Resolution, Arbitrary-Even-Order Direction Finding Method and Device - Method of high-resolution direction finding to an arbitrary even order, 2q (q>2), for an array comprising N narrowband antennas each receiving the contribution from P sources characterized in that the algebraic properties of a matrix of cumulants of order 2q, C | 10-30-2008 |
| 20090009394 | METHOD AND SYSTEM FOR ESTIMATING DIRECTIONS-OF-ARRIVAL IN LOW POWER OR LOW SAMPLE SIZE SCENARIOS - The present invention relates to a method and a system for determining the direction of arrival of one or multiple radio or acoustic waves and, more particularly, to such a method and system especially advantageous in situations where the number of available observations is small and/or the available observations are received with low power. The method significantly improves the performance of traditional subspace signal processing algorithms in the low sample size regime. The algorithm is specifically designed to provide consistent estimates even when the observation dimension has the same order of magnitude as the number of observations. This guarantees a good behaviour in finite sample size situations, where the number of sensors or antennae and the number of samples have the same order of magnitude or in scenarios where the received signal power is not sufficiently high to guarantee detection via conventional one-dimensional search methods. | 01-08-2009 |
| 20090015479 | METHOD AND APPARATUS FOR ALL-POLARIZATION DIRECTION FINDING - Embodiments of the present invention provide a method and apparatus for all-polarization direction finding. The method and apparatus generally include acquiring measurements at least partially corresponding to an emitted signal and generated utilizing a blind signal extraction algorithm, forming an all-polarization cost function utilizing the acquired measurements, and determining an angle of arrival for the emitted signal utilizing the formed all-polarization cost function. Such a configuration enables angles of arrivals to be easily determined for signals having any polarization without using a multiple signal classification (MUSIC) algorithm. | 01-15-2009 |
| 20090102718 | Method and Apparatus for Enhancing the Detection of Weak Emitters - A Method and Apparatus for Enhancing the Detection of Weak Emitters provide an enhanced method to eliminate the fake hits of a moving weak signal detection system. The method and apparatus have the abilities stated in the previous U.S. patent application Ser. No. | 04-23-2009 |
| 20090109095 | LOCATION ESTIMATION SYSTEM, METHOD AND PROGRAM - A location estimation method using label propagation. The achieved location estimation method is robust to variations in radio signal strengths and is highly accurate by using the q-norm (0| 04-30-2009 | |
| 20090243933 | DIRECTION-OF-ARRIVAL ESTIMATION APPARATUS - A direction-of-arrival estimation apparatus has a signal vector generation unit operable to generate a signal vector v composed of N baseband signals v | 10-01-2009 |
| 20090273520 | SYSTEM AND METHOD FOR DISCOVERING AND TRACKING COMMUNICATION DIRECTIONS WITH ASYMMETRIC ANTENNA SYSTEMS - A system and method for discovering and tracking communication directions is disclosed herein. In one embodiment, communication directions for two devices with asymmetric antenna systems are discovered. In one embodiment, a contention access period (CAP) is partitioned into an association CAP and a regular CAP, either of which may be further partitioned into sub-CAPs corresponding to different reception directions. In one embodiment, an association request command is transmitted by a device at different association sub-CAPs to train a transmission direction of the device. In one embodiment, further training is performed to find the best communication directions, as collisions may occur when association request commands are transmitted at different association sub-CAPs. | 11-05-2009 |
| 20090295640 | RADIOWAVE DIRECTION DETECTOR AND ANTENNA MOVING DEVICE - The radiowave direction detector has a radiowave direction detecting unit detects an arrival direction of the desired radio wave, a converting unit including a plurality of electromagnetic-to-electric converters to convert the desired radio wave, and a computing unit for determining the arrival direction of the radio wave, which matches a preset condition, by comparing the levels of electric signals that are transferred from the converting unit. | 12-03-2009 |
| 20100019971 | METHOD AND SYSTEM FOR POSITIONING MOBILE UNITS BASED ON ANGLE MEASUREMENTS - A method and system for positioning mobile units using angle measurements taken by neighboring mobile units is disclosed. A selected mobile unit and mobile units in the vicinity of the selected mobile unit are selectively instructed to measure and report information related to the position of the selected mobile unit. The reported information is used to compute a position of the selected mobile unit. | 01-28-2010 |
| 20100090900 | SIGNAL WAVE ARRIVAL ANGLE MEASURING DEVICE - A signal wave arrival angle measuring device includes: an observation data vector generation section generating an observation data vector necessary for an angle measurement of a signal wave from an electrical signal having been converted at a sensor group converting the signal wave of an observation target to the electrical signal; an ESPRIT angle measurement processing section calculating an arrival angle of the signal wave from the generated observation data vector; an arriving signal wave estimation section estimating information other than the arrival angle of the arriving signal wave from an angle measurement processing process data of the ESPRIT angle measurement processing at the ESPRIT angle measurement processing section; and a reliability determination section determining whether or not an angle measurement result of the calculated arrival angle is correct based on an estimation result of the arriving signal wave estimation section, and excluding an erroneous angle measurement result. | 04-15-2010 |
| 20100141530 | DIPOLE ARRAY WITH REFLECTOR AND INTEGRATED ELECTRONICS - A dipole antenna array comprising a ground plane, at least one dipole antenna including an active antenna element and a grounded antenna element, at least one reflector and integrated electronics, wherein the active antenna element is isolated from the ground plane and extends substantially perpendicular to the ground plane and the grounded antenna element extends in a direction substantially opposite to the active antenna element, the ground plane is contained within the area bounded by the reflector; the integrated electronics include at least one of a signal down converter and a signal up-converter, and at least some of the integrated electronics are contained in a space defined by at least one of a portion of the ground plane and a portion of the reflector. | 06-10-2010 |
| 20100194641 | Electromagnetic Radiation Source Locating System - An electromagnetic radiation source locating system including an electromagnetic radiation sensor including an antenna configured to detect a radiant energy transmission. A position detector is in communication with the controller and is configured to detect the position of the antenna relative to a reference coordinate system, while an orientation sensor is in communication with the controller and is configured to detect the orientation of the antenna and provide an orientation signal to the controller. A range sensor is configured to detect the distance to an aligned object in the path of a directional vector and provide a distance signal indicative thereof to the controller. An aerial vehicle may be in communication with the controller and configured to drop a marker for guiding navigators to the source of the radiant energy transmission. | 08-05-2010 |
| 20100259450 | INDOOR POSITIONING SYSTEM AND METHOD - A method, including: receiving, at an apparatus, first and second radio signals from a first location; discriminating the first and second radio signals, in order to estimate a bearing from the first location; and estimating, using the bearing and constraint information which is independent of the radio signals, a position of the apparatus. | 10-14-2010 |
| 20100302102 | Angle of arrival and/or range estimation within a wireless communication device - Angle of arrival and/or range estimation within a wireless communication device. Appropriate processing of communications received by a wireless communication device is performed to determine the angle of arrival of the communication (e.g., with respect to some coordinate basis of the wireless communication device). Also, appropriate processing of the communications may be performed in accordance with range estimation as performed by the wireless communication device to determine the distance between the transmitting and receiving wireless communication devices. There are two separate modes of packet processing operations that may be performed: (1) when contents of the received packet are known, and (2) when contents of the received packet are unknown. The wireless communication device includes a number of antenna, and a switching mechanism switches from among the various antennae capitalizing on the spatial diversity of the antennae to generate a multi-antenna signal. | 12-02-2010 |
| 20100309055 | METHOD AND APPARATUS FOR PASSIVELY LOCATING RADAR EMISSIONS FROM TRANSMITTERS - Systems and methods are presented for passive location of transmitters in which two or more receivers time stamp received signals from target transmitters and the time stamped data for each target signal of interest is isolated to identify a peak power time of arrival for the signal at each transmitter from which differential scan observation values are derived, and for each signal of interest a line of position curve is computed based on the differential scan observation value and corresponding receiver locations, and for each signal of interest an estimated target transmitter location is determined based on an intersection of two corresponding line of position curves. | 12-09-2010 |
| 20100309056 | METHOD AND SYSTEM FOR SCANNING RF CHANNELS UTILIZING LEAKY WAVE ANTENNAS - Methods and systems for scanning RF channels utilizing leaky wave antennas (LWAs) are disclosed and may include configuring a receiving angle of a plurality of LWAs in a wireless device to receive RF signals at a desired starting angle. The receiving angle may be swept while measuring RF signal strength. A location of RF signal sources may be determined based on the measured RF signal strength and corresponding angle of reception. A resonant frequency of the LWAs may be configured utilizing micro-electro-mechanical systems (MEMS) deflection. The LWAs may be configured so that they are situated along a plurality of axes in the wireless device. The LWAs may comprise microstrip or coplanar waveguides, where a cavity height of the LWAs is dependent on spacing between conductive lines in the waveguides. The LWAs may be integrated in integrated circuits, integrated circuit packages, and/or printed circuit boards. | 12-09-2010 |
| 20100321240 | DIRECTION FINDING OF WIRELESS DEVICES - Techniques are disclosed that allow for the detection, identification, and direction finding of wireless emitters in a given multipath environment. For example, the techniques can be used to detect and identify a line of bearing (LOB) to an IEEE 802.11 emitter in a building or in an open field or along a roadside. In some cases, multiple LOBs can be used to geolocate the target emitter if so desired. The techniques can be embodied, for instance, in a handheld device that can survey the target environment, detect an IEEE 802.11 emitter and identify it by MAC address, and then precisely determine the LOB to that emitter. In some cases, a sample array of response data from the target emitter is correlated to a plurality of calibrated arrays having known azimuths to determine the LOB to the target emitter. | 12-23-2010 |
| 20110050502 | Three Dimensional RF Search System - An RF signal detection process by incorporating direction detection of the RF signal along with energy detection to arrive at a signal of interest (SOI). The SOI is identified by matching direction detections and energy detections. Low-level and noise-like signals can be reevaluated for unresolved direction detections or energy detections. The RF signal detections can be filtered based on valid direction detections very early on in the processing chain to reduce the amount down-stream processing required. | 03-03-2011 |
| 20110133987 | Apparatus and Method for a Directional Finder - The invention provides a determination of direction to a remote object which omnidirectionally transmits a signal. The invention includes a handheld directional and omnidirectional antenna at a user's location and a handheld circuit coupled to the antennas to determine field strengths of the signal received from the remote object by the two antennas. A comparison of the received signals at the antennas during a sweep a field of observation is made and a probable direction of the remote object relative to the user's location is selected from the data sweep. The apparatus may further comprise a digital compass which generates a compass heading corresponding to each direction in which the directional antenna is pointed. The circuit stores field strength data by compass heading and averages the field strength data according to a predetermined protocol over compass headings. | 06-09-2011 |
| 20110181470 | Geosecurity methods and devices using geotags derived from noisy location data from multiple sources - In a geo-security system, a device receives RF signals from multiple distinct classes of RF communication systems and extracts location-dependent signal parameters. A current geotag is computed from the parameters by fuzzy extractors involving quantization of the parameters and Reed-Solomon decoding to provide a reproducible unique geotag. The current geotag is compared with a stored geotag, and a geo-secured function of the device is executed based on the result of the comparison. The use of multiple signal sources of different types, combined with special fuzzy extractors provides a robust geotag that allows both lower false rejection rate and lower false acceptance rate. | 07-28-2011 |
| 20110181471 | ADAPTIVE ANTENNA RADIO COMMUNICATION DEVICE - A device for estimating a direction-of-arrival of a radio wave, the device comprising an array antenna including a plurality of antenna elements for receiving a high frequency signal, a demultiplexer for demultiplexing the received high frequency signal for each of the plurality of antenna elements to generate a plurality of frequency component signals and a direction estimating unit for estimating the direction-of-arrival of the radio wave by using two or more of the plurality of frequency component signals which are contiguous in a frequency direction. | 07-28-2011 |
| 20110181472 | INCOMING WAVE CLASSIFYING AND DISTINGUISHING DEVICE, INCOMING WAVE CLASSIFYING AND DISTINGUISHING METHOD, ORIGINATING POSITION ESTIMATING DEVICE AND ORIGINATING POSITION ESTIMATING METHOD - Provided are a device and a method that can classify an incoming wave and can correctly distinguish the position of an originating device, even in a multipath environment. A principal vertically polarized wave arrival direction sensing unit ( | 07-28-2011 |
| 20110254736 | MANIFOLD CALIBRATION FOR A COMMUNICATION SYSTEM - A method and apparatus for determining stream weights is provided herein. During operation, an uplink direction of arrival (DOA) and a downlink direction of departure (DOD) calibration procedure is implemented using uplink signals and GPS information from a subset of mobiles without the need of calibration circuitry at the base. Because the presented calibration procedure needs no new hardware it can be deployed in existing deployments with only a soft-ware upgrade. | 10-20-2011 |
| 20110285590 | Determining Spatial Orientation Information of a Body from Multiple Electromagnetic Signals - A method for determining a spatial orientation of a body, including receiving, by receiving equipment located with the body, at least three electromagnetic signal sets, each of the received signal sets having been transmitted by a different one of at least three separate transmitters at different locations, detecting, for each one of the received signal sets, information that partially defines a direction from the body to the transmitter from which the signal set was received, the detected information including one of two angles that fully define an arrival direction from which the body received the signal set in relation to a body frame, the detected information not including a second of the two angles, and determining the spatial orientation of the body, including yaw, pitch, and roll angles relative to a navigation frame, using the detected information for each one of the received signal sets. | 11-24-2011 |
| 20110304507 | COMPACT SINGLE-APERTURE ANTENNA AND DIRECTION-FINDING NAVIGATION SYSTEM - A radio-based navigation system uses a small multi-mode direction-finding antenna and a direction-finding receiver to determine platform position, velocity, attitude and time while simultaneously providing protection against narrowband and broadband sources of interference. Global Navigation Satellite System (GNSS) signals such as those from a Global Positioning System (GPS) provide attitude measurements with a compact multi-mode direction-finding antenna (e.g., a small two-arm spiral with improved angle-of-arrival performance over the entire hemisphere enhanced through use of a conductive vertical extension of the antenna ground plane about the antenna perimeter and/or conductive posts placed evenly around the antenna perimeter) that provides protection against jammers. The multi-mode spiral may be treated as an array of rotationally-symmetric antenna elements. The GPS receiver architecture may be modified for direction-finding and thereby attitude determination by increasing the number of input signals from one to at least two while minimizing the required number of correlators and mixers. | 12-15-2011 |
| 20120105285 | APPARATUS AND METHOD FOR ESTIMATING ANGLE OF ARRIVAL IN REAL TIME - An apparatus for estimating an angle of arrival includes: a plurality of direction synthesizing units shifting the phase of each of a plurality of signals received by an array antenna such that the angle of arrival of each of the received signals is changed by a predetermined change angle; and an estimation unit estimating the angle of arrival of the received signal by using radiation gains of two phase-shifted signals among the signals phase-shifted by the plurality of direction synthesizing units. | 05-03-2012 |
| 20120169541 | Systems And Methods For A Terrestrial-Based Positioning Beacon Network - Terrestrial-based positioning beacon networks may include first and second terrestrial-based positioning beacons that are configured to simultaneously transmit signals to a terrestrial receiver. The first terrestrial-based positioning beacon may be configured to modify its transmissions to the terrestrial receiver in response to an identification of potential interference with the transmissions from the first terrestrial-based positioning beacon or the second terrestrial-based positioning beacon to the terrestrial receiver. Related methods, beacons, and receivers are also described. | 07-05-2012 |
| 20130009821 | METHOD AND APPARATUS FOR ESTIMATING LOCATION OF A WIRELESS STATION USING MULTI-BEAM TRANSMISSION - A method and apparatus for estimating location of wireless stations in a wireless communication network are provided. An estimation of a bearing angle of a wireless station from a reference point of a multi-beam antenna pattern is made based on a plurality of beaming angles of a multi-beam antenna pattern and a received signal property, at the wireless station, of each of a plurality of wireless signals transmitted on respective beams of the multi-beam antenna pattern for each of the plurality of beaming angles. | 01-10-2013 |
| 20130093626 | SIMULTANEOUS RADIO DETECTION AND BEARING SYSTEM - Provided is a non-transitory machine readable medium on which is stored a computer program including instructions to adapt a computer system having at least one processor as a simultaneous radio detection and bearing system, including: an RF conditioning subsystem for connection to a plurality of arrays of Frequency Range signal receiving channels, the RF conditioning subsystem operable to combine the signals from the arrays as a first internal data stream; and a coherent multi-channel digitizer subsystem coupled to the RF conditioning system, the coherent multi-channel digitizer subsystem operable to generate a time domain snapshot of the first internal data stream. The computer instructions further adapting the processor to transform the time domain snapshot to a frequency spectrum and identify at least one signal above a threshold at a determined frequency, determine the bearing of the signal, and provide the determined frequency of a selected identified signal to an audio recording subsystem, the audio subsystem contemporaneously recording the selected signal upon the determined frequency. | 04-18-2013 |
| 20130169485 | CODED APERTURE BEAM ANALYSIS METHOD AND APPARATUS - A method and apparatus for determining the range, radial velocity, and bearing angles of scattering objects reflecting RF signals or for determining the range, radial velocity, and bearing angles of sources RF signals. An array of antenna elements is utilized, the array of antenna elements each having an associated two state modulator wherein transmitted and/or received energy is phase encoded according to a sequence of multibit codes, the bits of the multibit codes each preferably having two states with approximately a 50% probability for each of the two states occurring within each given multibit code in said sequence of multibit codes, thereby allowing the determination of range, radial velocity, and bearing angles through digital computation after the scattered signals have been received. | 07-04-2013 |
| 20130229310 | SYSTEM AND METHOD FOR GEO-LOCATING AND DETECTING SOURCE OF ELECTROMAGNETIC EMISSIONS - A system for identifying a real-world geographic location of an emission source emitting electromagnetic energy includes a platform configured for movement and an apparatus disposed on the platform and configured to collect and process, in a passive manner and during movement of the platform, at least a pair of successive samples of the electromagnetic energy emission and define angular and spatial coordinates of the emission source. The apparatus includes at least a pair of antennas, a receiver coupled to antennas and a processor executing a predetermined logic. | 09-05-2013 |
| 20130278463 | ANTENNA ARRANGEMENT FOR DOA ESTIMATION - An antenna arrangement including at least two antenna functions arranged to cover a certain angular sector, each antenna function comprising a corresponding antenna port. The antenna arrangement is configured to perform: a first direction of arrival (DOA) estimation for a transmitting device at a first frequency, and a second DOA estimation for the transmitting device at a second frequency, wherein the second frequency has a larger magnitude than the first frequency, and wherein at least one second frequency grating lobe is apparent in the angular sector at the second frequency. The antenna arrangement is configured to: distinguish the at least one second frequency grating lobe from a second frequency main lobe using results from the first DOA estimation, and identify a pointing direction of the second frequency main lobe as a resulting DOA estimation. Related methods are also described. | 10-24-2013 |
| 20140125524 | METHOD AND APPARATUS FOR RADIO DIRECTION FINDING - An apparatus for radio direction finding, the apparatus comprising: a receiver configured to receive target signals to be subjected to the direction finding of signal sources, which are acquired by an antenna array; a channel profiler configured to produce profiles of the target signals received through the receiver; a pre-analyzer configured to preemptively process in a narrowband the wideband target signals based on the profiles that are produced by the channel profiler to produce pre-analyzed information for the wideband target signals; and a direction finder configured to perform the direction finding on the signal sources using the pre-analyzed information and the profilers of the target signals. | 05-08-2014 |
| 20140253387 | HIGH-RESOLUTION LINK-PATH DELAY ESTIMATOR AND METHOD FOR ESTIMATING A SIGNAL-PATH DELAY - Embodiments of a high-resolution link-path delay estimator and method are generally described herein. The high-resolution link-path delay estimator may estimate a signal-path delay of a signal path between a master and remote device. The high-resolution link-path delay estimator may phase-shift a transmit signal of alternating symbols by phase-shift values and may sample a loopback signal. A noise-reduced version of the sampled signal output may be correlated with a step function to generate a correlation value for each of the phase-shift values. One of the phase-shift values may be selected to generate a fine-delay estimate which may be added to a coarse delay estimate to determine the signal-path delay. The coarse delay estimate may be an estimate of the signal-path delay to a nearest symbol period of the transmit signal and the fine-delay estimate may be an estimate to within a fraction of the symbol period. | 09-11-2014 |
| 20140266908 | DETERMINING ACCESS POINT ORIENTATION BASED ON NEIGHBOR ACCESS PONT LOCATIONS - In an example embodiment, the orientation of a wireless device, such as an access point (AP) can be determined based on the location of neighboring wireless devices and the observed angle of arrival of signals from the wireless device at the neighboring wireless devices. For example, the angle of orientation can be determined by comparing an observed angle of arrival with the known actual angle between wireless devices. If a plurality of wireless devices measure the signal, the mean or median of the difference between observed angle of arrival of a signal from the wireless device with the actual angle for the plurality of wireless devices may be employed to determine the angular orientation. | 09-18-2014 |
| 20140292581 | Method and System for Determining Locations of Smartkeys - A location of a smartkey is determined by first determining coordinates of a set of candidate vertices of an array of receive antennas at a receiver based on maximal magnetic field voltages in the receive antennas due transmitting a radio signal (RF) by the smartkey. A set of candidate locations of the transmitter is determined based on the coordinate of the set of vertices. A set of final candidate locations is determined based on a predetermined threshold of the voltages. The final candidate locations are then combined to determine the location of the smartkey. | 10-02-2014 |
| 20140327581 | Device, System and Methods Using Angle of Arrival Measurements for ADS-B Authentication and Navigation - The present disclosure is directed to a receiver for Automatic Dependent Surveillance Broadcast (ADS-B) verification of a target aircraft including a first input for receiving flight tracking information from a target aircraft that indicates positional information of the target aircraft. The receiver further includes a second input for receiving positional and heading information indicating the location and orientation of a multi-element array antenna configured to be attached to the receiver, and a processing module that generates a measured bearing derived from angle of arrival data, and an expected bearing of the target aircraft derived from the indicated positional information of the target aircraft and the positional and heading information defining the receiver location and orientation. A comparator compares the expected bearing to the measured bearing and verifies the ADS-B flight tracking information of the target aircraft and outputs an indication of authenticity based on the verification. | 11-06-2014 |
| 20150009072 | System and Methods for Non-Parametric Technique Based Geolocation and Cognitive Sensor Activation - The present invention relates to a geolocation system and method for a multi-path environment. The geolocation system comprises one or more emitters ( | 01-08-2015 |
| 20150054689 | DIRECTION OF ARRIVAL DETERMINATION FOR A RADIO SIGNAL - At least two input signals, each characterizing a radio signal having a radio frequency (RF), are received. The input signals are converted into at least three output signals. The output signals have a unique combination of corresponding magnitudes for each RF phase difference between the input signals. A set of magnitudes corresponding to the output signals is measured using a mobile measuring device. An RF phase angle value is determined based the measured set of magnitudes. The RF phase angle value is converted into an angle value indicative of the direction of arrival of the radio signal. | 02-26-2015 |
| 20150309152 | METHOD FOR FINDING SIGNAL DIRECTION USING MODAL ANTENNA - A method for obtaining the direction of a signal incoming to a communication device is provided using a modal antenna that has multiple modes corresponding to multiple radiation patterns with a single feed. | 10-29-2015 |
| 20150323642 | DEVICE AND METHOD FOR LOCATION OF AN RFID TRANSMITTER - A device for locating a remote RFID transmitter in an environment providing separate paths of propagation of a wirelessly transmitted ultra-wide band signal. The receiver of the device has a module for estimating the impulse response of the plurality of paths of the first channel defined by a first antenna and a module for estimating the impulse response of the plurality of paths of the second channel defined by the second antenna, a module for calculating a plurality of argument differences between each component of the impulse response and each component of the impulse response for the plurality of paths respectively. The device further comprises a module for converting the plurality of argument differences into a plurality of arrival angles of the plurality of paths, a module for determining a location of the transmitter from the plurality of arrival angles. | 11-12-2015 |
| 20150362580 | METHOD FOR ESTIMATING ANGLE OF ARRIVAL OF MULTI-TARGET MOVING AT HIGH SPEED - A method for estimating an angle of arrival of multiple targets moving at a high speed includes defining a range and a resolving power of an angle of arrival and an angular velocity of a plurality of direction finding targets (S | 12-17-2015 |
| 20160054425 | Tracking a Radio Beacon from a Moving Device - A method and devices are disclosed, for tracking a radio beacon from a moving device, while the beacon transmits periodic signals, which the device detects at least at two different locations, and the device provided with information enabling determining the time difference between transmissions of these periodic signals. The method discloses a formula for estimating the angle between the course of the moving device and the beacon: ar cos [c*(TDOA | 02-25-2016 |
| 20160131735 | DETERMINING ACCESS POINT ORIENTATION BASED ON NEIGHBOR ACCESS POINT LOCATIONS - In an example embodiment, the orientation of a wireless device, such as an access point (AP) can be determined based on the location of neighboring wireless devices and the observed angle of arrival of signals from the wireless device at the neighboring wireless devices. For example, the angle of orientation can be determined by comparing an observed angle of arrival with the known actual angle between wireless devices. If a plurality of wireless devices measures the signal, the mean or median of the difference between observed angle of arrival of a signal from the wireless device with the actual angle for the plurality of wireless devices may be employed to determine the angular orientation. | 05-12-2016 |
| 20180024219 | AOA Determination Method and Associated Wireless Communication Device and Radio Base Station | 01-25-2018 |
| 20180024220 | DIRECTION FINDING USING SIGNAL POWER | 01-25-2018 |
