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8169597 |
Method and apparatus for laser return characterization in a countermeasures system
In a method for laser return characterization in a DIRCM system, the improvement locating a single IR detector in an aperture in an image mirror so that its output can be used for countermeasure...
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8115671 |
Precision method for aligning radio frequency pulse timing characteristics
A system and method for correlating first pulsed signals with second pulsed signals includes a first receiving unit, a second receiving unit and a correlation device. The first receiving unit is...
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8106811 |
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...
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8026839 |
Selective-sampling receiver
A receiver that selectively samples a received signal in order to suppress an interference component of the signal while recovering a desired component. The selective sampling may be accomplished...
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7932851 |
Ranging signal structure with hidden acquisition code
A method and apparatus for generating a data structure to be embedded in a ranging signal or in a synchronization preamble of a digital signal are disclosed. In a preferred embodiment, a plurality...
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7843376 |
Cross-eye jamming detection and mitigation
The invention includes, in its various aspects and embodiments, a method and apparatus for detecting cross-eye jamming. In some embodiments, the invention includes mitigating cross-eye jamming once...
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7843375 |
Method and apparatus for monitoring the RF environment to prevent airborne radar false alarms that initiate evasive maneuvers, reactionary displays or actions
Rather than costly modifications to existing radars, a small, low cost radar warning receiver is used to monitor the RF environment. This add-on receiver can provide situational awareness including...
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7821623 |
Surveillance satellite image denial system
A satellite surveillance countermeasure system uses an airborne platform to position a coherent radiation source above a substantial portion of the Earth's atmosphere. The coherent radiation source...
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7728770 |
Antenna
This invention relates to reducing the complexity and cost of antenna arrays and is more specifically concerned with reducing the complexity of an antenna apparatus (10). It provides an antenna...
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7576682 |
Method and system for radar target detection and angle estimation in the presence of jamming
A method for radar target detection and angle estimation in the presence of jamming includes the steps of receiving a signal from a radar array having elements arranged in rows and columns;...
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7477190 |
Smart antenna beamforming device in communication system and method thereof
A beamforming device includes a Direction Of Arrival (DOA) estimation unit for estimating DOAs of the received signals based on a data subcarrier matrix; a pre-spatial filtering unit for using the...
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7403153 |
System and method for reducing a radar interference signal
A system and method are provided to reduce an interfering signal in a radar return signal for a frequency modulated continuous wave (FMCW) radar. Once the interfering signal is detected, an extent...
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7317427 |
Adaptive array
An adaptive antenna array has array elements arranged in element rows and element columns and subarrays arranged in subarray rows and subarray columns, for which the subarray phase centers have...
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7295145 |
Selective-sampling receiver
A receiver that selectively samples a received signal in order to suppress an interference component of the signal while recovering a desired component. The selective sampling may be accomplished...
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7248203 |
System and method for detecting and jamming emitter signals
A system and method is provided for detecting emitter signals and for determining a scan strategy for a receiver system that receives such emitter signals. In one embodiment, the scan strategy may...
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6995660 |
Commander's decision aid for combat ground vehicle integrated defensive aid suites
A decision aid for use in the defense of a combat ground vehicle which includes a track fusion element, a threat typing element, threat prioritization element, and a countermeasures (CM) selection...
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6961017 |
Apparatus for providing anti-jamming capability to legacy GPS receivers
Most GPS equipped platforms currently in use have no anti-jamming capability. However, for various reasons, the cost of replacing the legacy GPS receivers with newer GPS receivers capable of...
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6933885 |
Miniaturized digital GPS anti-jam for space and size constrained applications
The present invention is a method and apparatus for providing anti-jam protection for GPS receivers. The anti-jam system of the present invention may require less space and less power than...
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6933878 |
Wide bandwidth radar
A wave-form generator drives a number of microwave generating devices each operating at different frequency bands. The output of each microwave generator is connected to its own transmission...
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6872960 |
Robust infrared countermeasure system and method
A system and method for focusing electromagnetic energy on a moving target. Generally, the inventive system sends a pilot beam to a target and analyzes a return wavefront to ascertain data with...
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6844850 |
Anti-jammer pre-processor
A blind anti-jammer pre-processor for detecting and alleviating the performance degradation due to strong jammers is disclosed. The anti-jammer pre-processor comprises a jammer detector (10)...
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6844841 |
Radio frequency link performance tool process and system
A system and method for optimizing transmission of radio frequency communication link signals in a radio frequency communications network comprises determining a statistical difference between a...
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6839017 |
Method and apparatus for using anti-jam technology to determine the location of an electromagnetic radiation source
A system employs null angle measurements developed in response to the detection of radiation, such as jamming, along with the positions at which the null angles are measured, to determine the...
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6771220 |
Memory efficient jammer locator for a digital adaptive beamforming receiver
A method and computer program product are disclosed for locating signal jammers in a digital beamforming receiver having an antenna with a plurality of associated antenna orientations. An...
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6768444 |
Method of interference suppression in a radar system
The invention relates to a method of interference suppression in a radar system (10) and also to a system (10) operating according to the method. The system (10) incorporates a first antenna (40)...
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6756934 |
Target shadow detector for synthetic aperture radar
Targets imaged by radar systems typically have shadows associated with them. Target detection and identification is enhanced by analyzing the shadow characteristics of a suspected target. Features...
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6748351 |
Modular covert remote electronic warfare simulator
An apparatus for electronic warfare signal simulation which is used in an external test system to simultaneously test a plurality of “victim” communication systems for vulnerability to jamming. The...
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6738012 |
Protecting commercial airliners from man portable missiles
A commercial airliner (10) carries a sensor that detects a characteristic (21) associated with a man portable missile (20). Raw sensor data is transmitted via a wireless data-link (41) to ground...
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6717543 |
Radar device for object self-protection
In regard to radar guidance of a launch container (15) for fragmentation projectiles (16) for defending against an attacking missile (12), from the object (11) to be protected, the present...
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6697009 |
Adaptive digital beamforming architecture for target detection and angle estimation in multiple mainlobe and sidelobe jamming
A system and method for detecting a radar target of interest in the presence of radar jamming interference include a sub-array beamformer, a sum and difference beamformer, a weight calculator, a...
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6686866 |
Two-piece radar-absorbing end cap assembly
The two-piece end cap assembly has an end cap that has a groove around its perimeter and at least one cavity. The end cap is fixed in place inside the flare case with the cavities exposed....
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6661366 |
Adaptive digital sub-array beamforming and deterministic sum and difference beamforming, with jamming cancellation and monopulse ratio preservation
A radar system and technique provide the capability to detect a target of interest and maintain the detection in the presence of multiple mainlobe and sidelobe jamming interference. The system and...
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6653969 |
Dispersive jammer cancellation
Generating a secondary beam (11) slightly offset from the main data collection beam (9) and obtaining hot clutter reference to be used in a conventional side lobe jammer processing algorithm (31)....
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6650271 |
Signal receiver having adaptive interfering signal cancellation
A radar system receiver having an antenna system adapted to receive a jammer signal from both a direct path and from an indirect path. The direct and indirect paths have both differential Doppler...
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6650270 |
Radar system
The present invention describes a system for counteracting countermeasures against radar detection. Two known countermeasures are “phase front tilting” and “isotropic scattering.” The inventi...
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6571171 |
Method and apparatus for graphically inserting waypoints for a flight management system
An apparatus and method for inserting a waypoint into a preexisting flight plan which includes selecting a waypoint on a graphical display of a portion of the flight plan and automatically...
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6567034 |
Digital beamforming radar system and method with super-resolution multiple jammer location
In a radar system, sampled aperture data are received from an antenna array. The sampled aperture data include data that do not correspond to echo returns from a beam transmitted by the antenna. A...
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6538597 |
Radar system having spoofer, blanker and canceler
A radar system including a blanker and a sidelobe canceler is described including an open loop nulling circuit for introducing one or more nulls in the main beam and a blanker beam. With this...
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6531976 |
Adaptive digital beamforming radar technique for creating high resolution range profile for target in motion in the presence of jamming
A wideband adaptive digital beamforming technique for maintaining a high range resolution profile of a target in motion in the presence of jamming utilizes a sequence of adaptively calculated...
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6518912 |
Signal processing circuit
A signal processing circuit is disclosed for providing fuze-on-jam capability in a target detecting device, while in the presence of continuous wave or continuous wave noise jammer signals. A...
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6509865 |
Adaptive antenna device operable in accordance with different algorithms
In an adaptive antenna device having directivity pattern generators operable in accordance with different algorithms, respectively, in a baseband modem, beam steering processing, null steering...
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6492937 |
High precision range measurement technique
Electronic Warfare (EW) systems aboard aircrafts are used to protect them from guided missile by denying threat radar systems the ability to track the aircrafts. In a typical operation, a threat...
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6486824 |
Tracking radar receiver
A tracking radar receiver as described herein is relatively invulnerable to image frequency jamming. Partial image-rejection down-converters down-convert RF signals to IF signals in each of various...
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6480139 |
Jammer counting using cholesky factor diagonal elements
A method and system for using the main diagonal elements of the Cholesky factor of the spatial covariance matrix to estimate the number of jammers present, by evaluating the AIC (or other) test...
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RE37877 |
Electronic counter measures in radar
Apparatus and method for eliminating an interference signal from a desired signal where a difference of polarization exists or can be made to exist. The desired signal is received on a first...
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6417799 |
Method of locating an interfering transmitter for a satellite telecommunications system
The invention relates to a method of locating a jammer (14) of a satellite telecommunications system (10). To locate the jammer, at least two of the following three measurements are performed: a...
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6369746 |
Simultaneous nulling in low sidelobe sum and difference antenna beam patterns
A radar system includes a null processor coupled to transmit receive modules. The null processor inserts nulls in the sum pattern at locations for suppressing a jamming source. The null processor...
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6317072 |
Multiple source jamming signal cancellation system
In a jamming cancellation system wherein a balanced modulator receives as two inputs thereto: the desired plus jamming signals, and the AM difference frequency produced by the beating of the...
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6313782 |
Coded phase modulation communications system
A coded phase modulation communications system which relates to communications systems in which undesired detectability of the radiated signal is materially reduced, and wherein the vulnerability...
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6295020 |
Master frequency generator
A system is provided for generating multiple frequencies in a specified frequency band, with a specified step size between frequencies, in which the spectral purity of the frequencies is assured....
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