Class / Patent application number | Description | Number of patent applications / Date published |
342357590 | Interference-related issues (IPC) | 60 |
20100194639 | CALCULATION METHOD OF THE AMOUNT OF ZENITH TROPOSPHERE DELAY, AND A CORRECTING METHOD OF TROPOSPHERE DELAY OF SATELLITE POSITIONING SIGNAL - This invention relates to the troposphere delay produced when the electromagnetic waves from a satellite or astronomical pass through the troposphere, in particular, it is related with the calculation method of a estimated value of the amount of zenith troposphere delay to real time, and troposphere delay of the satellite positioning signal in the case of positioning using the estimated value of this calculated amount of zenith troposphere delay is related with a correcting method. | 08-05-2010 |
20100201570 | Interference Power Measurement - A method of measuring the power of a signal from a transmitter ( | 08-12-2010 |
20110037649 | ENHANCING POSITION ACCURACY IN GLOBAL POSITIONING SYSTEM RECEIVERS - Enhancing position accuracy in global positioning system receivers. A pseudorange is measured, in a receiver, from each signal of a plurality of signals. Each signal is received from a different one of a plurality of satellites. A check is performed for an inconsistency among measured pseudoranges. Each measured pseudorange corresponds to the different one of the plurality of satellites. Further a power saving mode of the receiver is inactivated if the inconsistency is determined among the measured pseudoranges. Additionally, a position of the receiver is determined when the power saving mode is inactivated. | 02-17-2011 |
20110080319 | METHOD AND SYSTEM FOR RF INTERFERENCE MITIGATION USING A BLANKING WATCHGUARD - A global navigation satellite system (GNSS) enabled mobile device may be operable to monitor and determine counts at which autoblank signals are asserted over time intervals corresponding to consecutive time windows during the RF interference mitigation process using autoblanking. The GNSS enabled mobile device may be operable to disable the generation of a blank signal when the count may be greater than a particular count threshold at the end of the time window. The GNSS enabled mobile device may be operable to enable the generation of a blank signal when the count may be less than or equal to a particular count threshold at the end of the time window. The blank signals may be used to blank the processing of the received GNSS signals. | 04-07-2011 |
20110090116 | System and Method for Compensating for Faulty Measurements - A system and method for compensating for faulty satellite navigation measurements. A plurality of measurements in a system is received for a measurement epoch. A Kalman filter is used to calculate a state of the system for the measurement epoch based on the plurality of measurements, wherein the state of the system for the measurement epoch is calculated using a first closed-form update equation. A faulty measurement is detected in the plurality of measurements for the measurement epoch and a revised state of the system for the measurement epoch that compensates for the faulty measurement is calculated, using the calculated state of the system for the measurement epoch as an input to the revised state calculation, and using a revised closed-form update equation comprising the first closed-form update equation modified with respect to the faulty measurement. | 04-21-2011 |
20110102259 | Augmenting GNSS User Equipment to Improve Resistance to Spoofing - A method of countering GNSS signal spoofing includes monitoring a plurality of GNSS signals received from a plurality of GNSS signal sources and comparing broadcast data to identify outlying data, which is excluded from generation of a navigation solution defined by the plurality of GNSS signals. The outlying data can be a vestigial signal from a code or carrier Doppler shift frequency. The method includes triggering a spoofing indicator upon identification of the outlying data or other phenomenon. The phenomenon can include a shift in a phase of a measured GNSS navigation data bit sequence or a profile phenomenon of a correlation function resulting from correlation of the incoming GNSS signals with a local signal replica. The profile phenomenon can be the presence of multiple sustained correlation peaks. A nullifying signal can be generated and superimposed over a compromised signal. | 05-05-2011 |
20110187594 | Method for Self-Calibration of Frequency Offsets - A method for self-calibration of frequency offsets in a measurement equipment of an interference monitoring system is provided. The method involves sampling I/Q data using the interference monitoring system measurement equipment and acquiring satellite navigation signals from the I/Q data. A carrier frequency of the satellite navigation signal is estimated and an expected carrier frequency of the satellite navigation signal is calculated. The expected carrier frequency of the satellite navigation signal is compared with the estimated carrier frequency of the satellite navigation signal and a frequency offset value is calculated as the difference between the expected and estimated carrier frequencies of the satellite navigation signal. The frequency offset value is stored in a memory and used to compensate the frequency offset of at least one subsequent measurement. | 08-04-2011 |
20110254732 | SYSTEM AND METHOD FOR MULTI-CORRELATION WITH MODULATION-ADAPTED FILTER FOR THE FAST ACQUISITION AND THE TRACKING OF A RADIO NAVIGATION SIGNAL IN THE PRESENCE OF JAMMING - A system for receiving a radionavigation signal, notably in a jammed medium, emitted by a satellite of a satellite positioning system, includes: at least one first multi-correlator and at least one second multi-correlator disposed in parallel and operating respectively at a frequency; filtering means, disposed upstream of said multi-correlators; a delay line, disposed on the branch, between the filtering means and the second multi-correlator; means for sub-sampling at the frequency adapted for sub-sampling the signal transmitted directly and by branching with delay by the filtering means; and demodulation means eliminating the Doppler effect, disposed between the sub-sampling means and the first and second multi-correlators. | 10-20-2011 |
20110291888 | METHOD AND SYSTEM FOR RF INTERFERENCE MITIGATION USING A BLANKING WATCHGUARD - A global navigation satellite system (GNSS) enabled mobile device may be operable to assert one of autoblank signals when RF interference is detected in received GNSS signals for one of consecutive first time windows. The asserted autoblank signals are monitored by the GNSS enabled mobile device over time intervals corresponding to consecutive second time windows and a rate at which the autoblank signals are asserted for each of the consecutive second time windows is determined by the GNSS enabled mobile device based on the monitoring. The GNSS enabled mobile device may be operable to determine whether to blank processing of the received GNSS signals based on the determined rate. The autoblank signals may be asserted by the GNSS enabled mobile device based on a number of the received GNSS signals whose absolute signal levels exceed a signal level threshold for the first time window. | 12-01-2011 |
20120038512 | SATELLITE RECEIVER AND METHOD FOR NAVIGATION USING MERGED SATELLITE SYSTEM SIGNALS - Embodiments of a global navigation satellite system (GNSS) receiver and method for navigation are generally described herein. In some embodiments, the GNSS receiver includes signal processing circuitry to systematically identify clear channels from channels with persistent interference by performing two or more signal measurements within each of a plurality of channel bands. The channel bands include at least channel bands of at least two or more different global positioning satellite systems such as GPS satellites, GALILEO system satellites or GLONASS system satellites. In some embodiments, the GNSS receiver provides for self-adapting jamming avoidance in satellite navigation systems. | 02-16-2012 |
20120075142 | Multi-Stage GLONASS/GPS Automatic Frequency Control - A method of providing automatic frequency control pull-in for efficient receipt of GLONASS bits is described. This method can include first determining whether a channel noise (CNo) is greater than or equal to a predetermined value. When the CNo is greater than or equal to the predetermined value, the pull-in can be performed using a first series of predetection integration periods (PDIs) with activated decision-directed flips (DDFs) until a 20 ms boundary of a GLONASS data bit is found. When the CNo is less than the predetermined value, the pull-in can be performed using a second series of PDIs with always deactivated DDFs. A similar method of providing automatic frequency control pull-in for efficient receipt of GPS bits is also described. | 03-29-2012 |
20120105284 | GPS ANTENNA DIVERSITY AND NOISE MITIGATION - A system and method for improving acquisition sensitivity and tracking performance of a GPS receiver using multiple antennas is provided. In an embodiment, the acquisition sensitivity can be improved by determining the correlation weight of each received path signal path associated with one antenna form a plurality of antennas and then combining the path signals based on their respective correlation weight. In another embodiment, carrier offset correction information of each path signal is individually determined and then summed together to be used for tracking the code phase in a code phase tracking loop. The code phase tracking loop generates an early code and a late code that are used to determine the code phase error. The system includes notch and bandpass filters to mitigate narrowband and broadband noises of a received GPS signal, wherein the digital adaptive filters are switched on periodically or by external events. | 05-03-2012 |
20120212370 | WIRELESS COMMUNICATION DEVICE AND ASSOCIATED METHOD INCLUDING CONTROL OF POSITIONING-SYSTEM RECEIVER AND SHARED OSCILLATOR - The wireless communication device includes a wireless communication transceiver to generate an oscillator control signal and an activation signal, a positioning-system receiver (e.g. a GPS receiver) to process received positioning signals, and a shared oscillator (e.g. a temperature compensated and voltage controlled crystal oscillator TCVCXO) responsive to the oscillator control signal and to generate a reference frequency signal for the wireless communication transceiver and the positioning-system receiver. The positioning-system receiver may control processing of the received positioning signals based upon the activation signal to reduce a noise contribution (e.g. phase noise) due to frequency control of the shared oscillator based upon the oscillator control signal. The activation signal may indicate that the oscillator control signal is being varied to provide frequency control or adjustment of the shared oscillator. | 08-23-2012 |
20120286994 | METHOD AND SYSTEM FOR LOCATING INTERFERENCES AFFECTING A SATELLITE-BASED RADIONAVIGATION SIGNAL - Method for locating sources interfering with a satellite-based radionavigation signal comprising the following steps:
| 11-15-2012 |
20120306695 | METHOD AND APPARATUS FOR ADJUSTING THRESHOLD WEIGHT OF FREQUENCY DOMAIN TO IMPROVE ANTI-JAMMING PERFORMANCE AND ELIMINATE JAMMING IN GPS SYSTEM - A method and apparatus for improving anti-jamming performance are provided. A threshold value level estimated in a GPS (global positioning system) receiver RF/IF stage, a threshold value weight, a median value of a median value of a 2-8 MHz bandwidth is estimated as a threshold value with respect to a frequency component exceeding the estimated threshold value level, and an adjustable K-median threshold scheme is provided in a multi-jamming environment. | 12-06-2012 |
20120326925 | 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. | 12-27-2012 |
20130021201 | Assisted Global Navigation Satellite System (AGNSS) with Precise Ionosphere Model Assistance - Embodiments enable higher accuracy GNSS performance by generating local/regional ionosphere models tailored to specific local/regional areas of interest and by using location-based delivery of the local/regional ionosphere models to mobile GPS receivers. Different types and levels of reference locations (e.g., Cell ID (CID), Location Area Code (LAC), Radio Network Controller ID (RNC-ID), Mobile Country Code (MCC)) can be used to estimate the location of mobile GPS receivers and to deliver the appropriate local/regional ionosphere models to the mobile GPS receivers. According to embodiments, the local/regional ionosphere models are fit into the same 8-parameter set as the broadcast global ionosphere model, therefore being compatible with existing GPS receivers that accept the broadcast global ionosphere model. | 01-24-2013 |
20130093620 | DUAL FREQUENCY RECEIVER FOR SATELLITE BASED POSITIONING AND ASSOCIATED METHOD OF RECEPTION - Dual-frequency (L | 04-18-2013 |
20130113656 | METHOD OF REDUCING THE GLARE OF A RECEIVER RECEIVING SIGNALS FROM EMITTERS - The present invention relates to a method of reducing the glare of at least one receiver within a positioning system, the system including a plurality of emitters, each emitter emitting signals modulated by one and the same code whose autocorrelation function exhibits a main peak and at least one white zone in which the autocorrelation function is a minimum, the signals for each emitter includes a first signal modulated by the code and a second signal out of phase with respect to the first signal, the second signal being modulated by the code which is delayed with respect to the code modulating the first signal, and a receiver, the latter being configured so as to detect signals emitted by the emitters and implementing, for the tracking of the first and second signal emitted by one of the emitters, a local signal modulated by the code. | 05-09-2013 |
20130154880 | DIGITAL BEAMFORMING FOR SIMULTANEOUSLY MITIGATING WEAK AND STRONG INTERFERENCE IN A NAVIGATION SYSTEM - An adaptive cascaded electronic protection processing system for global navigation satellite system (GNSS) threat mitigation is provided. The system includes a precorrelation characterization component configured to provide at least one parameter characterizing a plurality of received signals. A correlator is configured to provide a plurality of correlation results, each representing one of the plurality of received signals. A spatial weight contribution component is configured to determine an optimal set of digital beam-forming weights via an optimization process according to the at least one parameter. A postcorrelation characterization component is configured to determine at least one constraint on the optimization process according to the plurality of correlation results. | 06-20-2013 |
20130201058 | PROCESSING SATELLITE DATA FOR SLANT TOTAL ELECTRON CONTENT MEASUREMENTS - A method, system, and apparatus provide the ability to estimate ionospheric observables using space-borne observations. Space-borne global positioning system (GPS) data of ionospheric delay are obtained from a satellite. The space-borne GPS data are combined with ground-based GPS observations. The combination is utilized in a model to estimate a global three-dimensional (3D) electron density field. | 08-08-2013 |
20130207839 | Strong WWAN-WLAN Intermodulation (IM) Mitigation and Avoidance Techniques - Apparatuses, methods, and computer-readable media for mitigating intermodulation (IM) distortion in wireless communications devices and systems are presented. Aspects of the present invention include several different techniques that can be used separately or in tandem. For example, a receiver mitigates IM distortion by altogether avoiding reception of satellites in a GNSS band(s) that are affected by it (e.g. “victim’ or “affected” band). A receiver may instead switch reception of satellites in a GNSS band that are affected by the IM distortion (e.g. the “victim” band) and not in a dedicated tracking mode, to another GNSS band that is not affected (e.g. “non-victim” band), while still maintaining tracking of satellites in the original victim GNSS band that are in a dedicated tracking mode. A receiver may also shift a local oscillator (LO) frequency. A receiver may also perform enhanced cross-correlation techniques, such a widening or expanding an existing Xcorr algorithm mask. | 08-15-2013 |
20130234886 | Adaptive Method for Estimating the Electron Content of the Ionosphere - An adaptive method for estimating the electron content of the ionosphere comprises: collecting a set of measurements carried out by a plurality of beacons receiving radio frequency signals transmitted by a plurality of transmitting satellites; computing coordinates of the points of intersection between the transmission axis of the signals and a surface surrounding the Earth, and of a vertical total electron content determined at each of these points; computing a vertical total electron content for each of the nodes of an initial mesh of the surface; a statistical dispersion analysis of the vertical total electron content; a computation step making it possible to define a suitable statistical estimator, or a computation step making it possible to generate a suitable mesh of the surface; a statistical error analysis making it possible to select between a validation of the adaptation of the method and a stopping of the method. | 09-12-2013 |
20130271316 | Detection of Falsified Signals in a Satellite Navigation System - A device for detection of falsified signals in a satellite navigation system includes at least two antennas having one or more receivers for receiving navigation signals, a phase difference measuring unit for determining phase differences of the received navigation signals for each antenna, and a detection unit for detecting falsified navigation signals among the received navigation signals on the basis of the phase differences determined. | 10-17-2013 |
20140002303 | APPARATUS AND METHOD FOR HANDLING JAMMING SIGNAL | 01-02-2014 |
20140035783 | Multi-beam antenna array for protecting GPS receivers from jamming and spoofing signals - Multi-beam antenna array for anti jam and anti-spoof protection of GPS satellite data using multiple directional antennas disposed in various orientations jamming or spoofing signals from any direction cannot damage all said directional antennas simultaneously. Each said directional antenna connected to filtering amplifier and to multiple GPS processors for calculating direction of signal arrival. An anti-jam/anti-spoof processor comparing directions of signals arrival with real satellites positions for arrival time from data storage filters signals from jamming or spoofing signals, which are not corresponding to the correct positions stored for each satellite at the transmit time. | 02-06-2014 |
20140070989 | INTERFERENCE WAVE SIGNAL REMOVING DEVICE, GNSS RECEPTION APPARATUS, MOBILE TERMINAL, INTERFERENCE WAVE SIGNAL REMOVING PROGRAM AND INTERFERENCE WAVE REMOVING METHOD - An interference wave signal frequency is highly accurate and the interference wave signal is surely removed. A controller of an interference wave signal remover detects the interference wave signal based on a frequency scanning result by an entire-range frequency scanner, and sets a notch filter to attenuate the interference wave signal frequency. A local scan frequency band BWf | 03-13-2014 |
20140111378 | METHOD AND APPARATUS FOR REMOVING SPOOFING SIGNAL IN SATELLITE NAVIGATION SYSTEM - Provided is a method and apparatus for removing a spoofing signal. The apparatus may convert a global positioning system (GPS) signal from an RF signal to an IF signal, and remove a spoofing signal based on whether the spoofing signal is present in the RF signal. The apparatus may obtain and track the spoofing signal using the IF signal, and generate a characteristic of the spoofing signal. The apparatus may generate an anti-spoofing signal by shifting a phase of the spoofing signal 180 degrees based on the characteristic of the spoofing signal. | 04-24-2014 |
20140125520 | ANTI-JAMMING SUBSYSTEM EMPLOYING AN ANTENNA WITH A HORIZONTAL RECEPTION PATTERN - An anti-jamming subsystem for a jamming signal originating along the horizon includes an anti-jamming antenna with a horizontal reception pattern constrained to receive signals originating along the horizon. The subsystem receives the signals from the anti-jamming antenna and a reference antenna, which has a half hemispherical reception pattern looking skyward. The subsystem utilizes associated phase information to phase shift the signals received by the anti jamming antenna and produce an anti-jamming signal, and combines the anti jamming signal with the signals received by the reference antenna to produce signals in which the interference from the jamming signal originating along the horizon is actively cancelled and the phase and timing information of signals received by the reference antenna from at least higher elevation satellites is preserved. The horizontal reception pattern of the anti-jamming antenna may be circular or directional toward a known jammer positioned along the horizon. | 05-08-2014 |
20140152499 | METHODS, SYSTEMS, AND COMPUTER READABLE MEDIA FOR MITIGATION OF IN-BAND INTERFERENCE OF GLOBAL POSITIONING SYSTEM (GPS) SIGNALS - Methods, systems, and computer readable media for mitigation of interference of GPS signals are disclosed providing selective mitigation of in-band interference implementing deterministic phase control. In one embodiment, a system for mitigating interference of GPS signals includes a pair of antennas, each receiving GPS signals that include both a desired signal component and a jammer signal component. The signal from one antenna is phase-shifted as needed to make it anti-phase with the signal from the other antenna, so that when the two signals are combined, the jammer signal components substantially cancel each other, leaving the desired signal components. Determining the phase shift required involves deterministically calculating the phase shift based on the amplitudes of the two input signals and the amplitude of the combined signal instead of the iterative techniques used in conventional systems. | 06-05-2014 |
20140184443 | FILTERING OUT A JAMMER SIGNAL - A low noise amplifier (LNA) assembly comprising a filter circuit for receiving signals from a Mobile Satellite Service (MSS) band and a Radio Navigation Satellite Service (RNSS) band; and an alternative filter circuit configured to filter out a jammer signal. | 07-03-2014 |
20140203964 | GLOBALLY REFERENCED POSITIONING IN A SHIELDED ENVIRONMENT - A method, apparatus and system for globally referenced positioning in a shielded environment includes integrating and correlating information from a UWB receiver, a GPS receiver, and a bent-path GPS receiver adapted to extract a GPS radio frequency wave from a heterodyned GPS signal. The method, apparatus, and system is resistant to interference and can be used in a shielded environment such as indoors or behind a line-of-sight barrier. | 07-24-2014 |
20140247186 | Global Navigation Satellite System (GNSS) Anti-Interference using Array Processing - Embodiments of the invention are directed to GNSS anti-interference using array processing. In one embodiment, a device may be configured to receive signals GNSS signals. In one embodiment, the signals may include a superposition of GNSS signals from independent transmitter sources and a spoofing signal. The spoofing signal may include several pseudo random noise (PRN) codes originating from a single transmitter source. In a one embodiment, the device may include multiple radio frequency (RF) inputs connected to multiple antennas and may use a combining algorithm to produce a weighted sum of the antenna outputs. The resultant sum may be passed through an output port of the device that is configured to be coupled to an RF input port of a GNSS receiver. | 09-04-2014 |
20140253376 | VERIFIABLE AUTHENTICATION SERVICES BASED ON GALILEIO SIGNALS AND PERSONAL OR COMPUTER DATA - A method for providing verified authentication services is presented. The method utilizes a verified authentication apparatus comprising a radio navigation receiver, a navigation processor, and a verification device. The method comprises: (A) receiving an authenticated navigation signal transmitted from a radio positioning system by using the radio navigation receiver, (B) obtaining the position coordinates, velocity and timing coordinates of the radio-navigation receiver by using the navigation processor, and (C) verifying reliability of the obtained position coordinates, velocity and timing coordinates of the radio navigation receiver by using a verification device; wherein a verified authentication service is provided. | 09-11-2014 |
20140266881 | DATA COLLECTION DEVICE AND METHOD FOR THE LOCALISATION OF A SOURCE OF INTERFERENCE - A data collection device carried on board a satellite and making it possible to localise a source of interference, without using neighbouring satellites, comprises: a reception device able to receive the frequency on the ground of the interference; at least three antenna points arranged on the satellite so as to be able to receive a radiofrequency signal coming from the target surface; a processor able to determine the amplitude of the interference signal at the level of each of the antenna points; a connection device able to connect successively each of the antenna points to the processor. | 09-18-2014 |
20140266882 | SYSTEM AND PROCESS OF DETERMINING VEHICLE ATTITUDE - A system and process that can be used to determine vehicle attitude with only one navigation receiver. In one embodiment, the antenna of the navigation receiver is driven with a signal that modulates sensitivity in azimuth. The received navigation signal strength is demodulated by the phase at which the antenna is sweeping and a phase angle and a magnitude for the incoming signal are calculated. Using this calculated phase angle, magnitude and antenna characteristics, the location of the user (i.e. the navigation receiver) and the location of the navigation satellite, the attitude of the antenna and hence the user or user vehicle can be determined. | 09-18-2014 |
20140292575 | METHOD FOR FORMATION OF A SIGNALS ARRAY FROM A RECEIVER OF SIGNALS FROM A SATELLITE NAVIGATION SYSTEM IN ORDER TO IMPROVE ITS RESISTANCE TO SCRAMBLING OR INTERFERENCE - Method for formation of a signals array from a receiver ( | 10-02-2014 |
20140292576 | METHOD FOR DETECTING SIGNALS INTENDED AS A DECOY FOR A RECEIVER OF SIGNALS FROM A SATELLITE NAVIGATION SYSTEM AND ASSOCIATED RECEIVER - Method for detecting signals intended as a decoy for a receiver of signals from a satellite navigation system, the receiver being equipped with an antenna using controlled reception pattern sensors, comprising the following steps consisting in, for each satellite:
| 10-02-2014 |
20140320343 | POSITIONING SYSTEM INCLUDING A MECHANISM FOR DETECTING FRAUD BY CHECKING THE VISIBILITY OF SATELLITES - A positioning system comprises at least one onboard GNSS satellite receiver in a mobile element belonging to a user u, said receiver having the function of estimating the position Xu of said mobile element at various instants, a processing module determining a consistency indicator coh(X) by analysis of the signals received by the GNSS receiver, said indicator being representative of the difference between the visibility of the satellites used for the estimation of position Xu[t] by the receiver and the expected visibility at this position. | 10-30-2014 |
20140327573 | Detecting Timing Anomalies - Disclosed herein are system, method, and computer program product embodiments for adapting to malware activity on a compromised computer system. An embodiment operates by detecting an active adversary operating malware on a compromised system. A stream of data traffic associated with active adversary is intercepted. The stream of data traffic includes a command and control channel of the active adversary. The stream of data traffic is accessed. An emulation of the command and control channel is provided. An analysis of the accessed stream of traffic is executed. A plurality of response mechanisms is provided. The plurality of response mechanisms is based in part on the analysis of the stream of data traffic and a custom policy language tailored for the malware. | 11-06-2014 |
20140327574 | Multi-Constellation GNSS Integrity Check for Detection of Time Signal Manipulation - The present application discloses detecting manipulation of GNSS signals using a second time source. If two or more GNSS constellation signals are being detected, the phase error between the GNSS constellation signals may be monitored. When the phase error drifts, then manipulation is determined. The integrity of a GNSS constellation signal may be monitored using an internal time source such as a crystal oscillator by monitoring a slope of the free running counter at the detected rising edges of a pulse-per-second signal from the GNSS constellation. If more than two GNSS constellations are monitored, a voting scheme may be used to determine the manipulated GNSS constellation. | 11-06-2014 |
20140354475 | MITIGATION OF SPURIOUS SIGNALS IN GNSS RECEIVERS - A method of processing received satellite signals is provided. The method includes detecting frequency, power level, code phase and doppler frequency of a plurality of satellite signals and frequency and power level of a plurality of spurious signals. The plurality of spurious signals is ranked based on one or more ranking parameters. A first subset of the plurality of spurious signals which are ranked equal or above a threshold rank are processed through a plurality of notch filters and a second subset of the plurality of spurious signals which are ranked below the threshold rank are processed through a weeding filter. | 12-04-2014 |
20140368383 | Method for Carrier-to-Noise Ratio Estimation in GNSS Receivers - A method for determining an indicator of an amount of noise comprised within a received signal within a satellite communication network or a GNSS involves extracting a received modulating signal from the received signal. An estimate of the transmission delay is determined based on the in-phase component of the modulating signal. A prompt replica of the modulating signal is generated using the estimate of the transmission delay. A prompt quadrature correlation of the quadrature component of the received modulating signal and of the quadrature component of the prompt replica is determined, and the indicator of the amount of noise comprised within the received signal is determined based on the prompt quadrature correlation. | 12-18-2014 |
20140375500 | ANTI-JAMMING APPARATUS AND METHOD FOR COMPACT ARRAY ANTENNA - An anti-jamming apparatus and method for a compact array antenna are provided. The anti-jamming apparatus for a compact array antenna includes a Global Navigation Satellite System (GNSS) array antenna unit including a plurality of GNSS antennas for receiving GNSS signals transmitted from a satellite. A first beam-forming unit includes a plurality of combination units for receiving respective signals received by the plurality of GNSS antennas as a first reference signal and first auxiliary signals and combining the first reference signal with the first auxiliary signals, thus forming different beams. A second beam-forming unit receives signals of the different beams, and combining the signals of the different beams, thus forming an anti-jamming beam in which an invisible area is minimized. | 12-25-2014 |
20150035701 | GNSS RECEIVER DYNAMIC SPUR MITIGATION TECHNIQUES - Techniques for compensating for interference in a Global Navigation Satellite System (GNSS) receiver of a mobile device are provided. An example method according to these techniques includes determining transmission band information and channel tuning information associated with an operating configuration of a Wireless Wide Area Network (WWAN) transceiver of the mobile device, identifying interference compensation data using the transmission band information and the channel tuning information for compensating for interference caused by the WWAN transceiver at the GNSS receiver, and dynamically configuring notch filters of the GNSS receiver according to the interference compensation data. | 02-05-2015 |
20150035702 | GPS JAMMING SIGNAL RECEIVER AND GPS JAMMING SIGNAL RECEIVING METHOD - A global positioning system (GPS) jamming signal receiver and a GPS jamming signal receiving method are provided. The GPS jamming signal receiver may include a sample data generator to generate a sample data signal with respect to a signal received through an GPS antenna; a jamming signal determiner to determine a jamming state of a GPS jamming signal using the sample data signal and a navigation processing result value of the sample data; and a transmission direction angle calculator to determine a phase difference value of the GPS jamming signal according to the determination result and to calculate a transmission direction angle of the GPS jamming signal. | 02-05-2015 |
20150070212 | Detection of Deceptive Navigation Signal - A method and device for detecting the presence of a deception scheme intended to thwart a satellite navigation system (SNS). A detector receives “receiver measurements” of various types from the SNS receiver. It conditions these values, so that they may be readily used by a process that determines whether the receiver is operating in a statistically normal state. | 03-12-2015 |
20150116147 | Determination of Integrity of Incoming Signals of Satellite Navigation System - A system and method for testing the integrity of signals incoming to a satellite navigation system. The method is implemented with an array of antenna elements, and a receiver connected to each antenna element. The receivers simultaneously and continuously make measurements on all tracked signals. Each receiver measures the carrier phase of an incoming signal. Based on the carrier phase differences between antenna elements and the distance between them, the azimuth and elevation of the signal source can be calculated. This measured angle of arrival can then be compared to an expected angle of arrival to determine if the signal source is legitimate. The system and method can be also applied to determining the angle of arrival of sources of interference, and to mitigating the effects of both illegitimate and interfering signals. | 04-30-2015 |
20150116148 | METHOD FOR PREDICTING SPOOFING SIGNAL AND APPARATUS THEREOF - In a global navigation satellite system, a spoofing signal received at a first point in time is processed to generate measurement data including a carrier phase value, and characteristics of a spoofing signal corresponding to a second point in time at which an anti-spoofing signal is to be generated are predicted on the basis of the measurement data at the first point in time. An anti-spoofing signal is generated on the basis of the predicted characteristics of the spoofing signal. | 04-30-2015 |
20150116149 | METHOD OF DETECTING INTERFERENCE IN A SATELLITE RADIO-NAVIGATION SIGNAL - Method of detecting interference in a satellite radio-navigation signal, characterized in that it comprises the following steps:
| 04-30-2015 |
20150123846 | APPARATUS AND METHOD FOR DETECTING DECEPTION SIGNAL IN GLOBAL NAVIGATION SATELLITE RECEIVER - An apparatus and method for detecting a deception signal in a global navigation satellite receiver is disclosed, the apparatus for detecting the deception signal in the global navigation satellite receiver including an identifier to identify output data output from a global navigation satellite receiver receiving an input of a global navigation satellite signal, and a determiner to determine whether the global navigation satellite signal is a deception signal and a normal signal. | 05-07-2015 |
20150293234 | Positioning, Navigation, and Timing Device Interference and Spoofing Detector With Timing Mitigation - Disclosed herein are system, method, and computer program product embodiments for a GNSS interference and spoofing fast detection and mitigation system. A RF signal associated with a PNT device, such as a GNSS receiver, is received. The received RF signal is split into a plurality of sub-data signals. The received RF signal is re-routed by sending each of the plurality of sub-data signals to at least one of a processing module and a switching module. An anomaly associated with a second sub-data signal is detected. The anomaly is detected during a capture period of an adversarial attack on the PNT device, prior to corruption of any associated system depending on outputs from the PNT device. An output of a first sub-data signal of the plurality of sub-data signals is terminated based on the anomaly detected with the second sub-data signal. | 10-15-2015 |
20150346345 | GLOBAL NAVIGATION SYSTEMS ANTENNA - A phased array antenna that can be utilized in one or multiple Global Navigation Satellite Systems. This type of GNSS phased array antenna is often referred to as a CRPA. Various C-Band CRPA embodiments are illustrated to provide advanced performance in a compact real estate size that may fit within L-Band GPS ARINC and L-Band GPS 7-element CRPA size. A Large L-Band CRPA embodiment of the present invention provides for a substantial number of degrees of freedom that can be utilized to provide for advanced beam steering and null steering for advanced interference and multipath mitigation to form nulls over specific geographic regions. | 12-03-2015 |
20160047915 | INTERFERENCE DETECTION USING MULTIPLE AUTOMATIC GAIN CONTROLLERS - A global navigation satellite system (GNSS) receiver includes radio frequency front end and digital processing functionality. Radio frequency front end includes radio frequency input; first variable gain amplifier adjusts first gain of first frequency range of first analog GNSS signal received from radio frequency input by first amount; and second variable gain amplifier adjusts second gain of second frequency range of second analog global navigation satellite system signal received from radio frequency input by second amount. Digital processing functionality compares first amount of adjustment of first gain of first frequency range with second amount of adjustment of second gain of second frequency range; and detects first interference signal present in first frequency range or second frequency range when first amount of adjustment of the first gain of first frequency range differs from second amount of adjustment of second gain of second frequency range by more than first threshold amount. | 02-18-2016 |
20160047916 | AUTOMATED METHODS FOR SUPPRESSION OF SPURIOUS SIGNALS - An automated method is provided for suppressing spurious signals in a direct digital synthesized signal. To determine magnitudes of local oscillator (“LO”) feedthrough and image frequency signal components, a digitally synthesized RF signal is digitally analyzed. To reduce the magnitude of the LO feedthrough signal component for the LO feedthrough signal component, one or more first parameters of at least one digital-to-analogue converter is automatically adjusted following a first search pattern. To reduce the magnitude of image frequency signal component for the image frequency signal component, at least one second parameter of the at least one digital-to-analogue converter is automatically adjusted and at least one third parameter of a phase compensation network is automatically adjusted following a second search pattern. The automatically adjusting for the LO feedthrough signal component and for the image frequency signal component can be iterated. | 02-18-2016 |
20160146944 | DETECTING AND REMOVING SPOOFING SIGNALS - A method for detecting and removing spoofing signals may include receiving, by a navigation or communications device, a radio frequency (RF) signal and performing an anti-spoofing assessment to detect a presence of a spoofing signal associated with the RF signal. The method may additionally include generating a replica of the spoofing signal in response to the spoofing signal being detected and subtracting the replica of the spoofing signal from the RF signal to provide a residual non-spoofed signal. The method may further include decoding the residual non-spoofed signal by the navigation or communications device. | 05-26-2016 |
20160154111 | MITIGATION OF RADIO FREQUENCY INTERFERENCE (RFI) IN GLOBAL POSITIONING SYSTEM (GPS) SIGNALS | 06-02-2016 |
20160154113 | Detection of Satellite System Anomalies | 06-02-2016 |
20160377726 | GLOBAL NAVIGATION SATELLITE SYSTEM (GNSS) SPOOFING DETECTION WITH CARRIER PHASE AND INERTIAL SENSORS - A system to detect spoofing attacks is provided. The system includes a satellite-motion-and-receiver-clock-correction module, a compute-predicted-range-and-delta-range module, a subtractor, and delta-range-difference-detection logic. The satellite-motion-and-receiver-clock-correction module periodically inputs, from a global navigation satellite system (GNSS) receiver, a carrier phase range for a plurality of satellites. The satellite-motion-and-receiver-clock-correction module outputs a corrected-delta-carrier-phase range for a current epoch to a first input of a subtractor. The compute-predicted-range-and-delta-range module outputs a predicted delta range to a second input of the subtractor. The predicted delta range is based on inertial measurements observed for the current epoch. The subtractor outputs a difference between the corrected-delta-carrier-phase range and the predicted delta range for the current epoch to delta-range-difference-detection logic. The delta-range-difference-detection logic determines if the difference exceeds a selected-range threshold. If the difference exceeds the selected-range threshold, the delta-range-difference-detection logic determines the GNSS receiver was spoofed in the current epoch. | 12-29-2016 |
20170234986 | SECURE GNSS POSITIONING IN VEHICLE UNIT | 08-17-2017 |