| Class / Patent application number | Description | Number of patent applications / Date published |
|---|
| 342016000 | ECCM (Electronic counter-countermeasures, i.e., antijamming) | 28 |
| 20100026547 | METHOD AND APPARATUS FOR PROVIDING JAMMER DETECTION IN A RECEIVER - A method and apparatus for detecting a jammer comprising sampling an input signal; downconverting and sampling the input signal to generate a sampled downconverted (SD) input signal; comparing the sampled input signal to a wideband threshold TH | 02-04-2010 |
| 20100259437 | TEMPORAL CW NULLER - A temporal nuller for removing or minimizing narrow band interference/jamming power from a global positioning system (GPS) receiver's input includes a first signal path having a first input and a first output, at least one time delay device and an adjustable phase shift device located within the first signal path, and a second signal path having a second input and a second output. The first signal input is connected to the second signal input, and the first signal output is connected to the second signal output. Further, the at least one time delay device is operative to introduce a time delay between a signal at an output of the at least one time delay device relative to a signal at an input of the at least one time delay device. | 10-14-2010 |
| 20100265116 | ANTI JAMMING SYSTEM - Anti jamming system comprising a tunable negative jamming signal feedback loop for feedback suppression of a received jamming signal, including an receiver receiving an jamming signal followed by a replica jamming signal generator for generating an replica jamming signal. The receiver comprising a zero IF PLL receiver having a synchronous demodulator and a phase detector, signal inputs thereof being coupled to said input means and carrier inputs coupled to in-phase and phase quadrature oscillator outputs, respectively, of a local voltage controlled oscillator (VCO), said VCO receiving a tuning control signal for tuning the zero IF PLL receiver at the carrier frequency of the jamming signal. The VCO is included in a phase locked loop (PLL) comprising subsequent to the VCO, said phase detector and a loop filter. The replica jamming signal generator includes a modulator with a baseband signal input coupled to an output of said synchronous demodulator and a carrier input coupled to the in-phase oscillator output of the VCO, an output of said modulator being negatively fedback to the input of the receiver. | 10-21-2010 |
| 20100283658 | ANTI JAMMING SYSTEM - Anti jamming system comprising a tunable negative jamming signal feedback loop for feedback suppression of a received jamming signal, including a receiver receiving an jamming signal followed by a jamming signal replica generator for generating an replica jamming signal. The receiver comprising a zero IF PLL jamming signal receiver having a synchronous demodulator and a phase detector, signal inputs thereof being coupled to said input means and carrier inputs coupled to in-phase and phase quadrature oscillator outputs, respectively, of a local voltage controlled oscillator (VCO), said VCO receiving a tuning control signal for tuning the zero IF PLL jamming signal receiver at the carrier frequency of the jamming signal. The VCO is included in a phase locked loop (PLL) comprising subsequent to the VCO, said phase detector and a loop filter. The replica jamming signal generator includes a tracking modulator with a baseband signal input coupled to an output of said synchronous demodulator and a carrier input coupled to the in-phase oscillator output of the VCO, an output of said modulator being negatively feedback to the input of the receiver. | 11-11-2010 |
| 20100289687 | Antijam protected GPS-based measurement of roll rate and roll angle of spinning platforms - A system and method for determining the roll rate and roll angle of a spinning platform in a jamming environment, by suppressing the interference signals from the received GPS signals and using the measured phase and amplitude differences between the GPS satellite signals received on two or more antennas. The measured signal differences and the navigation solution from a GPS receiver are processed in a roll filter to obtain the desired information. Data from non-GPS measurement sources is optionally provided to update the navigation solution. Although of wide applicability, the invention is uniquely suited to the measurement of roll rates and roll angles of fast spinning platforms with small baselines in the presence of jamming, and where the antennas are separated from each other by distances that are a fraction of the GPS signal wavelength. | 11-18-2010 |
| 20100289688 | TACTICAL RADIO AND RADIO NETWORK WITH ELECTRONIC COUNTERMEASURES - A tactical radio includes a radio frequency (RF) processing module having a receiving component path and a transmitting component path. A signal processing module coupled to the RF processing module includes a jammer detection stage for identifying a type of jamming signal on a channel over which communications signals are received simultaneously. A jammer model stage in the signal processing module produces a waveform model for the jamming signal, and a channel model stage replicates propagation conditions on the channel and produces a corresponding cancellation signal. The cancellation signal is coupled at such a level into the receiving component path so as to cancel the jamming signal from received communications signals at the front end of the radio. Any residual jamming signals may then be removed by a secondary jamming cancellation stage operating at baseband. | 11-18-2010 |
| 20120119934 | 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. | 05-17-2012 |
| 20120235848 | METAMATERIAL FOR A RADIO FREQUENCY COMMUNICATIONS APPARATUS - A metamaterial for a radio frequency communications apparatus is disclosed. The metamaterial can comprise a flex circuit and an array of circuit elements mounted on the flex circuit. Each of the circuit elements can comprise a conductive trace and at least one hybrid component electrically coupled to the conductive trace. | 09-20-2012 |
| 20130154868 | System and Method for an RF Receiver - In accordance with an embodiment, a radio-frequency (RF) front-end for a radio configured to receive an RF signal at a first frequency includes an antenna port configured to be coupled to an antenna, and a notch filter having an input coupled to the antenna port. The notch filter is configured to reject one or more frequencies, such that the first frequency is a harmonic or intermodulation distortion product of the one or more frequencies. The RF front-end also includes a piezoelectric filter having an input coupled to an output of the notch filter and an output configured to be coupled to an RF amplifier. The piezoelectric filter has a pass band comprising the first frequency. | 06-20-2013 |
| 20130328711 | ANTI-JAMMING SUBSYSTEM EMPLOYING AN ANTENNA ARRAY WITH A HORIZONTAL CIRCULAR RECEPTION PATTERN - An anti-jamming subsystem for jamming signals originating along the horizon includes a two-dimensional horizontal array of antennas that effectively has a horizontal circular reception pattern for receiving signals originating along the horizon and a antenna that has a half hemispherical reception pattern and an upward looking view of the sky. The subsystem utilizes associated phase information to actively combine the signals received by the respective antennas in the array, to produce one or more anti jamming signals with narrow beams in the directions of the jammers. The subsystem combines the anti jamming signals with the signals received by the reference antenna, to produce signals for further processing in which the interference from the jamming signals originating along the horizon is minimized without adversely affecting the signals received by the reference antenna from at least higher elevation satellites. | 12-12-2013 |
| 20140253361 | SYSTEMS AND METHODS FOR DETECTING RADAR SIGNALS - This disclosure includes systems and methods for detecting radar signals by performing an initial spectral analysis to identify candidate radar signals and subsequently determining whether any candidate radar signals are false detections using a secondary analysis. | 09-11-2014 |
| 20150378005 | RADAR APPARATUS AND METHOD OF REDUCING INTERFERENCE - A radar apparatus and method of reducing interference which can reduce an amount of interference are provided. The radar apparatus transmits a modulated pulse signal and a non-modulated pulse signal. The radar apparatus includes an interference frequency detecting module and a map generating module. The interference frequency detecting module detects an interference frequency that is a frequency of an interference wave, based on reception signals containing a reflection wave caused by either one of the modulated pulse signal and the non-modulated pulse signal. The map generating module generates a frequency map for specifying an interference band that is a frequency band where the interference frequency exists and a no-interference band that is a frequency band where the interference frequency does not exist. A central frequency of at least one of the modulated pulse signal and the non-modulated pulse signal is set based on the frequency map. | 12-31-2015 |
| 20160047894 | ANTI-GEOLOCATION - Methods, apparatus, and articles of manufacture make Geolocation of a source transmitter more difficult or impossible. Scatterers common to a source transmitter and an intended receiver are identified using a variety of techniques, such as iterative time reversal (ITR) and Singular Value Decomposition (SVD) of a scatter matrix. The source transmitter then uses time reversal and knowledge of the signatures of the scatterers to focus its transmissions on one or more of the scatterers, instead of the intended receiver. The source transmitter may have multiple antennas or antenna elements. The source transmitter and/or the intended receiver may include antenna elements with Near-Field Scatterers to enable spatial focusing below the diffraction limit at the frequencies of interest. The source transmitter may be a plurality of ad hoc nodes cooperating with each other. | 02-18-2016 |
| 20160091598 | Sparse Space-Time Adaptive Array Architecture - A sparse multichannel array includes a plurality of array elements, a receiver behind each array element, and a Doppler filter bank behind each receiver, whereby within each Doppler bin is placed spatial nulls at selected angles of undesired interference. The invention enables Doppler processing to be performed on sparse arrays, such as nested or coprime arrays, used in nonlinear adaptive beamforming to mitigate the impact of unintentional interference and hostile jamming on the received signal. | 03-31-2016 |
| 20160172751 | A System and Method for Reducing the Probability of Detection of a Communication and Sensor Mast | 06-16-2016 |
| 20170234967 | RADAR SENSOR | 08-17-2017 |
| 342017000 | Radar reacts to jamming | 12 |
| 20100026548 | JAMMER DETECTION WITH ADAPTIVE FAST ATTACK/SLOW RELEASE RESPONSE FOR CONTINUOUS AND BURST MODE - Jammer detection is operable in both continuous and burst modes, managing a jammer attack in both cases. Whether in continuous or burst mode, jammer presence is detected according to a burst jammer environment. Results of jammer presence detection are stored to create a history of the jammer presence, and the history is used to manage the jammer attack. | 02-04-2010 |
| 20100026549 | JAMMER DETECTION WITH MITIGATION OF DETECTION THRESHOLD HYSTERESIS PINCH-OFF EFFECT - Jammer detection is operable in both continuous and burst modes, managing a jammer attack in both cases. Whether in continuous or burst mode, jammer presence is detected according to a burst jammer environment. Results of jammer presence detection are stored to create a history of the jammer presence, and the history is used to manage the jammer attack. Jammer detector thresholds are implemented with hysteresis, and a hysteresis pinch-off characteristic is mitigated. | 02-04-2010 |
| 20100134342 | Method for Cleaning Signals for Centralized Antijamming - The present invention relates to a method for cleaning signals for centralized antijamming. The invention makes it possible to provide as many cleaned antenna channels as sub-arrays with limited computational requirements. The method proceeds in two steps. Initially, an antijamming matrix (M) is computed. This matrix depends on the noise covariance matrix (Γ), on a weighting vector (w | 06-03-2010 |
| 20110128178 | COGNITIVE ANTI-JAM RECEIVER SYSTEMS AND ASSOCIATED METHODS - Cognitive anti-jam receiver systems and associated methods are provided. The systems and methods may include a signal analysis module that processes a baseband signal to determine one or more signal characteristics of the baseband signal, the baseband signal comprising at least a desired signal; a cognitive decision unit that receives the one or more signal characteristics from the signal analysis module, and generates at least one first adaptive parameter; and at least one anti-jam processing module that processes the baseband signal to generate a modified signal that reduces an impact of at least one jammer signal on a quality of reception of the desired signal from the baseband signal, where processing by the at least one anti-jam processing module may be based at least in part on the received at least one first adaptive parameter from the cognitive decision unit. | 06-02-2011 |
| 20130106640 | GPS SIGNAL RECEPTION APPARATUS AND METHOD | 05-02-2013 |
| 20150323650 | MIMO ANGLE ESTIMATION WITH SIMULTANEOUS MAINLOBE JAMMER CANCELLATION - A radar system includes a transmit antenna array having subarrays disposed at predetermined positions. An orthogonal waveform signal is directed to a corresponding one of the subarrays. On receive, an adaptive processor derives a plurality of adaptive weight factors from a plurality of receive signals and applies them to the receive signals to obtain a jammer cancelled signal. That signal is separated into its orthogonal waveform components by passing it through a bank of correlators. The correlator system provides a plurality of unique receive signals substantially corresponding one-to-one to the unique transmit subarrays. The receive beamformer derives an angular estimate of at least one target relative to boresight from the unique receive signals. | 11-12-2015 |
| 20160139246 | Passive Listening Pulse Adaptive Sidelobe Canceller - The present invention relates to methods and systems for electronic countermeasures, and particularly to methods and systems for electronic countermeasures that employ radar jamming devices. | 05-19-2016 |
| 342018000 | By changing frequency | 4 |
| 20100085233 | Radar system for detecting the surroundings with compensation of interfering signals - The invention relates to a frequency-modulated radar system for detecting the surroundings with compensation of interfering effects, the compensation being achieved by varying one of the following sizes:
| 04-08-2010 |
| 20130234878 | System and Method of Radar Location - A system and method of radar location comprises radar signal emission means, an emitted pulse of duration T | 09-12-2013 |
| 20140354464 | RADAR DECEPTION JAMMING PREVENTION USING BI-STATIC AND MONO-STATIC RADARS - A method of preventing the jamming of radars is provided utilizing two radars located at a distance to prevent both velocity and range pull off. | 12-04-2014 |
| 20160033622 | METHOD AND APPARATUS FOR COGNITIVE NONLINEAR RADAR - A method and apparatus for cognitive non-linear radar processing comprising identifying one or more frequency bands of interest, passively scanning, using a non-linear radar (NR), the one or more frequency bands of interest to determine whether interference signals are occupying the one or more bands, transmitting radar waveforms and receiving radar waveform responses at one or more frequency bands determined to be free of interference, determining a likelihood of a target being present or not based on whether the received waveform responses match stored waveform responses for non-linear targets, and modifying waveform parameters of the transmitted radar waveform when the received waveform responses match the stored waveform responses, so as to transmit a modified radar waveform. | 02-04-2016 |
| 342019000 | By varying gain or blocking receiver | 1 |
| 20100245151 | WIDEBAND JAMMER DETECTOR - Techniques for detecting jammer signals in a received signal are described. In one aspect, high-speed current mirror resistive compensation circuits and output impedance boosting circuits are utilized to increase amplifier bandwidth in an improved wideband amplifier circuit. In another aspect, a dual transistor configuration including common source topology, averaging capacitors and a comparator circuit is utilized to improve the sensing of signal peaks in a peak detector block, which can be used together with the wideband amplifier circuit and a digital jammer detection circuit to detect jammer signals. The digital jammer detection circuit aids in the determination of the presence of jammer signals within the received signal, the determination of which may be variable due to programmability of the digital jammer detection circuit as described. | 09-30-2010 |
