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| Number | Title | Issue Date |
| 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 terrain. In order to conserve bandwidth, a technique is used, in which re... | 08/12/2008 |
| 7336220 | Method and apparatus for equalizing broadband chirped signal In order to generate a signal for canceling a chirped signal, a transmitter generates a cancellation signal along with the transmitted signal, using a single term variable complex gain multiplier adapted to cancel the chirped signal only at its instantaneous frequen... | 02/26/2008 |
| 7327794 | Method and apparatus for detecting a jammed channel in a block oriented digital communication system A method and apparatus for detecting a channel jammed by narrowband jamming interference in a block oriented digital transmission system such as an orthogonal frequency division multiplexing (OFDM) or discrete multi-tone (DMT) system. A spectrum of a received data b... | 02/05/2008 |
| 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 wherein the AGC of the receiver is operated in a linear state. A second m... | 07/31/2007 |
| 7209523 | Ultra-wideband receiver and transmitter A waveform-adaptive ultra-wideband (UWB) transmitter and noise-tracking UWB receiver for use in communications, object detection and radar applications. In one embodiment, the output of an oscillator is gated by a low-level impulse generator either directly or throu... | 04/24/2007 |
| 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 technique. This invention solves, in particular, the incompatibility bet... | 03/01/2005 |
| 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) and associated electronic circuits for emitting i... | 07/27/2004 |
| 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 test system includes a remote radiator of a signal free of jammi... | 06/08/2004 |
| 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 invention accomplishes this counteraction by deliberately producing a t... | 11/18/2003 |
| 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 sum and difference receiver channels. Image frequency com... | 11/26/2002 |
| 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 subtracting from the received signal an intermediate sign... | 10/29/2002 |
| 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 transmitting signals with specific characteristics which a... | 07/16/2002 |
| 6323806 | Antenna system and method for operating an antenna system The invention relates to an antenna installation with an omni-directional antenna (M) and with an auxiliary antenna (A1) the reception signals from which can be combined in respect of amplitude and phase in such a way that a reception miniumu is produced ... | 11/27/2001 |
| 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 desired and jamming signals, jamming suppression, in an environm... | 11/13/2001 |
| 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 from electromagnetic radiations received by each of the r... | 10/31/2000 |
| 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 combination of echo signals from a target and jamming signals, passi... | 10/17/2000 |
| 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 building an adaptive antenna description, representing a nu... | 08/17/1999 |
| 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 emissions can be superposed, a detection stage (1), connected ... | 08/12/1997 |
| 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 0s. A target detected on each radar beam sweep is a 1 and no... | 11/05/1996 |
| 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 reflects back from various surfaces of the targeted object whi... | 07/30/1996 |
| 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 over a wide communication bandwidth centered at a relativel... | 02/27/1996 |
| 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 output. Two signal processing networks form the difference betwe... | 08/15/1995 |
| 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 from the prior art in adaptive interference cancellation in t... | 08/08/1995 |
| 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 attenuator scheme for attenuating the interfering signal while... | 06/13/1995 |
| 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 applying same to one input of a balanced modulator while simult... | 11/08/1994 |
| 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 by a microprocessor which calculates new tap values from... | 10/11/1994 |
| 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 jamming produced by a hostile electronic countermeasure on a tar... | 05/10/1994 |
| 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 the side lobe blanking circuit will also blank a noise ja... | 04/26/1994 |
| 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 correction signals related to the voice signal. The transmi... | 11/02/1993 |
| 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).... | 12/22/1992 |
| 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 of a received signal into frequency segregated time domain ... | 10/23/1990 |
| 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 determined time interval surrounding the change-over instant of e... | 02/20/1990 |
| 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 fE (n), with which is associated a number of secondary antennas ASl, . . . ASN.... | 01/02/1990 |
| 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 maximum for which a threshold may be achieved to prevent a fals... | 08/18/1987 |
| 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 antennas, each antenna being associated with a correspondi... | 02/25/1986 |
| 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 incident waves with mutually orthogonal linear (e.g. horizont... | 10/01/1985 |
| 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 the time at which the earliest response would be expected a... | 07/15/1980 |
| 4122452 | Jamming signal cancellation system Improved radar system performance in a jamming environment is achieved by applying the received signal containing both the desired radar signal and a higher level FM jamming signal to a radar receiver only during the time when the instantaneous frequency ... | 10/24/1978 |
| 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.... | 09/12/1978 |
| 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, a second detector, a video amplifier, a junction, an angle... | 05/30/1978 |
