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7475273 |
Hybrid parallel/serial bus interface
A hybrid serial/parallel bus interface has a data block demultiplexing device. The data block demultiplexing device has an input configured to receive a data block and demultiplexes the data block...
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7411539 |
Method for detecting the presence of radar signal emitters, an electronic support measures unit and a system for determining the position and identity of said emitters
A method for passively detecting the presence of radar signal emitters, in which an ESM unit receives radar signals with a number of antennas, each antenna covering a sector of the surrounding...
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7250899 |
GPS receiver with improved immunity to collocated transmissions and method therefor
A method and apparatus for limiting the effect of interfering transmission on a Global Positioning System (GPS) receiver is disclosed. A first mode of operation of the GPS receiver is provided...
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6861977 |
Agile PRT deconvolution method and systems, and its uses
This invention relates to radar signal processing. In particular, this invention concerns signal processing of agile Pulse Repetition Time (PRT) sampled signal transmitted using spread spectrum...
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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...
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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....
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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...
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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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6473596 |
Close proximity transmitter interference limiting
A weaker signal receiving system inclusive of stronger nearby-sourced interference signal cancellation capability. Stronger interference signal cancellation is accomplished by actively canceling or...
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6420995 |
Radar and IFF system
A silent radar system which detects a target and its position without the countermeasure operator located at the target being able to detect the presence of the radar. The silent radar operates by...
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6323806 |
Antenna system and method for operating an antenna system
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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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6141371 |
Jamming suppression of spread spectrum antenna/receiver systems
A jamming suppression system which includes a plurality of receivers for receiving electromagnetic radiations and a separate notch filter coupled to each receiver for filtering selected frequencies...
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6133866 |
Method of operating monopulse radar
A method of operating a radar to track echo signals from a target in the presence of a barrage jammer is shown to comprise the steps of actively determining the apparent direction of the...
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5940033 |
Apparatus, methods and computer program for evaluating multiple null forming antenna processors and jammers
An automated interactive antenna patterning apparatus depicts adaptive array antenna patterns and selects adaptive antenna array characteristics. The apparatus comprises an antenna modeling means...
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5657020 |
Diode detector logarithmic receiver
The device, a microwave pulse signal amplifier, includes an input (E), designed to be connected to a wideband reception head (A, H) suitable for picking up pulse emissions, on which continuous...
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5572215 |
Digital data processor
A plurality of threshold detectors is provided to pass analog signals of predetermined and varying threshold values. An analog to digital converter converts these analog signals to binary 1s and...
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5541603 |
Reduced radar cross-section RF seeker front-end
A Reduced Radar Cross-Section RF Seeker Front-End interrogates a potential arget by issuing interrogation radiation toward the target and receiving and analyzing a portion of the radiation that...
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5495253 |
Soliton rejection filter
A soliton rejection filter circuit is provided, for use in RF signal procing, for isolating a low level signal in the presence of stronger nearby interfering signals and detecting its modulation...
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5442365 |
Technique for processing interference-contaminated radar energy
A technique for improving sidelobe canceller performance by blocking the canceller output signal upon sensing reduced main channel interference accompanied by an increased sidelobe canceller...
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5440308 |
Apparatus and method for employing adaptive interference cancellation over a wide bandwidth
A new adaptive interference technique is disclosed which not only increases the cancellation bandwidth but also reduces the convergence time for the adaptive process. This new technique departs...
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5424674 |
Wide dynamic range detection circuit
Two wide dynamic range detection circuits are disclosed, which are capable of detecting low-level desired signals in the presence of nearby strong interfering signals. Each circuit includes an...
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5363104 |
Jamming signal cancellation system
Improved radar system performance in a jamming environment is achieved by detecting the AM difference frequency produced by the beating of the desired radar signal with the jamming signal and...
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5355091 |
Apparatus for real time interference signal rejection
Disclosed is a real time interference signal rejection circuit which utils a conventional chirp-Z analyzer to generate a critical number and stop a counter circuit. The critical number is then read...
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5311192 |
Polarization ECCM technique for radar systems
A process for cancelling the effects of noise jamming in a radar system having a dual-polarization monopulse antenna, a computer processor, and target detection algorithms, wherein the noise...
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5307069 |
Improved radar receiver system
An improved radar receiver having side lobe blanking and coherent side lobe cancellation circuits in the main receiver channel and a control arrangement that overcomes the conventional problem that...
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5259030 |
Antijam improvement method and apparatus
A method and apparatus for communicating radio frequency signals that may reduce the susceptibility of the signals to jamming. A digital voice signal may be interleaved and transmitted with error...
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5173701 |
Radar apparatus with jamming indicator and receiver device with jamming indicator
A radar apparatus is provided with a jamming indicator (11), the jamming indicator (11) having the same bandwidth as the preselector filter (15) of the radar receiver (5).
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4965581 |
Real-time rejection circuit to automatically reject multiple interfering hopping signals while passing a lower level desired signal
A real-time rejection circuit for passing low level desired signals in the resence of one or more strong, interfering signals. A chirp-Z transform system separates the various frequency components...
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4903032 |
Method and device for protection against a jammer in a radio station comprising several change-over antennas and their use for the making of radiogoniometers
The method consists in the step of masking the energy influence of the aliased spectrum of a jammer received in the useful band of each of the reception channels of a radio station during a...
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4891647 |
Method and a device for reducing the power of jamming signals received by the secondary lobes of a random frequency radar antenna
A method and a device for reducing the power of jamming signals received by the secondary lobes of the main antenna AP of a radar transmitting at a random frequency f E (n), with which is...
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4688042 |
Short pulse receiver with anti-jam capability
A short pulse radar receiver having a detector with a threshold automatically adjustable with the level of noise and interfering signals. Interfering signals at signal levels which exceed the...
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4573052 |
Method and device for reducing the power of jamming signals received by the sidelobes of a radar antenna
An apparatus and method for reducing the power of active jamming signals received by the sidelobes of a radar antenna. A known method includes providing a radar with a main antenna and N auxiliary...
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4544926 |
Adaptive jamming-signal canceler for radar receiver
A radar receiver, associated with a transmitter sending out circularly or linearly polarized waves, has two parallel channels for the respective processing of incoming echo signals derived from...
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4213128 |
Method for decreasing the jamming susceptibility of short range interrogators
A technique for decreasing the susceptibility of short range interrogators, hich utilize time delay as a code means, to pulse jamming and spoofing. The technique uses information received prior to...
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4114152 |
Pulse radar apparatus with integration device
Pulse radar apparatus employs integration circuits following demodulator circuits to control the suppression of interference signals and prevent the display of interference on a PPI scope.
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4092645 |
Radar jammer homing circuit
1. In a fire control radar system of the character which produces radar signals having a predetermined repetition period and which includes coupled in cascade; an intermediate frequency amplifier,...
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3981012 |
Random frequency radar systems
1. A random frequency radar system comprising: a normally blocked transmitting channel including a radio frequency oscillator; a receiving channel including a mixer and a local oscillator feeding...
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3887919 |
High speed microwave switching logic for eccm
A radar receiver to sense the instantaneous presence of a jamming signal ch is passed through a guard band filter centered around the narrow microwave receiver band and after being sensed the...
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3879666 |
Circuit for anti-jam receiver of wide dynamic range utilizing instantaneous automatic gain control action for closely packed pulses
A circuit for producing instantaneous automatic gain control of the interiate stages for an anti-jam range receiver. A plurality of intermediate frequency amplifier stages, each having a pair of...
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3789405 |
AUTOMATIC STEP ELIMINATOR CIRCUIT TO PREVENT RADAR JAMMING
An automatic step eliminator circuit to prevent radar jamming is provided wherein the voltage applied to the AGC input of one IF amplifier of a tracking radar is sampled in two parallel sample and...
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3772702 |
DUAL GATED AGC RADAR
A dual gated AGC radar receiver is provided having independent AGC (automatic gain control) loops for ECM (electronic countermeasure) on and ECM off conditions. A detector provides controlling...
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3713153 |
PULSE RADAR SYSTEM FOR DETECTING MOVING TARGETS
A pulse radar system for the detection of moving targets, comprising a clutter suppression system for the elimination of echoes of fixed objects of echoes of objects with smaller radial speeds...
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3278936 |
Automatic beam blanking for stacked beam radar
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3127606 |
Angle information during jam condition in pulse doppler search-while-track radar
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3095540 |
Intermediate frequency balance bias system
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3050726 |
Radar system including anti-jamming means
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3039092 |
Radio object locating system of continuously variable frequency
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3039090 |
Radar anti-jamming device
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3015026 |
Interference signal suppression system
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