Patents
Sitemap › H04 - Electric communication technique › H04K - Secret communication; Jamming of communication › H04K 3 - Jamming of communication; Counter-measures
Patents for H04K 3 - Jamming of communication; Counter-measures (1,951)
04/1991
04/02/1991US5005209 Process and apparatus for the transmission of selective addresses and/or emergency messages in shortwave radio networks
03/1991
03/19/1991US5001771 Communications jammer
03/19/1991US5001659 Structure for connecting a rotatable body to a stationary body
02/1991
02/27/1991EP0414534A2 An anti-intrusion defeator and locator for communication satellites
02/06/1991EP0258432B1 Multimode noise generator using digital fm
12/1990
12/20/1990DE3215975C1 Multi-channel directional ratio system - combines available channels on transmitting side in digital form in time-multiplexing framework
12/13/1990WO1990015489A1 Dummy traffic generation
11/1990
11/28/1990EP0215117B1 Spread spectrum adaptive antenna interference canceller
11/20/1990WO1990014722A1 System and method for communications security protection
11/20/1990US4972480 Holographic communications device and method
11/20/1990US4972469 System and method for communications security protection
11/06/1990US4969160 Dual channel clock recovery circuit
10/1990
10/24/1990EP0393542A2 Method and apparatus for achieving improved anti-jam performance via conversion gain
10/23/1990US4965581 Real-time rejection circuit to automatically reject multiple interfering hopping signals while passing a lower level desired signal
10/09/1990US4962508 Dual channel interference canceller
07/1990
07/27/1990WO1990009067A1 Method and apparatus for preventing external detection of signal information
04/1990
04/18/1990EP0363640A2 High-frequency anti-jam communication system terminal
04/03/1990US4914699 High frequency anti-jam communication system terminal
01/1990
01/25/1990WO1990000840A1 System for protecting digital equipment against remote access
12/1989
12/26/1989US4890297 Burst jammer erasure circuit for spread spectrum receivers
10/1989
10/24/1989US4876545 Adaptive blanking interface apparatus for self-protection jamming equipment employed in conjunction with radar systems
07/1989
07/04/1989CA1256946A1 Hidden preamble for frequency hopped synchronization
06/1989
06/27/1989US4843638 Receiver for frequency hopped signals
06/27/1989CA1256516A1 Multimode noise generator using digital fm
05/1989
05/24/1989EP0317101A2 A security system and a signal-carrying member therefor
04/1989
04/05/1989EP0309855A2 Method and apparatus for transmitting selective addresses and/or distress signals in short-wave radio networks
03/1989
03/07/1989CA1250911A1 Spread spectrum adaptive antenna interference canceller
02/1989
02/14/1989US4805231 Apparatus for detecting an electronic surveillance device
02/08/1989EP0302146A1 A receiver for, and method to receive, frequency hopped signals
01/1989
01/17/1989CA1249031A1 Unit for preventing an interception of a radio communication signal transmitted between a fixed facility and a mobile station
11/1988
11/30/1988EP0293167A2 A communications jammer
09/1988
09/07/1988EP0280718A1 Hidden preamble for frequency hopped synchronization.
08/1988
08/02/1988USH510 Automatic authentication for voice transmissions
08/02/1988US4761813 Military radar or radio communication system
06/1988
06/21/1988US4752939 Hidden preamble for frequency hopped synchronization
04/1988
04/26/1988US4741037 System for the transmission of speech through a disturbed transmission path
03/1988
03/10/1988WO1988001816A1 Hidden preamble for frequency hopped synchronization
02/1988
02/23/1988US4727568 Unit for preventing an interception of a radio communication signal transmitted between a fixed facility and a mobile station
01/1988
01/12/1988US4719649 Autoregressive peek-through comjammer and method
12/1987
12/31/1987CN87209325U 载频噪音信号发生器 Carrier frequency noise signal generator
11/1987
11/03/1987US4704737 Compressive receiver having pulse width expansion
10/1987
10/07/1987EP0240328A2 Computer security device
10/07/1987EP0239614A1 Compressive receiver having pulse width expansion
09/1987
09/24/1987DE3609834A1 Method and device for interfering with electromagnetic radiation
09/09/1987EP0235477A1 Jamming resistant method and apparatus for radio transmission of coded information
09/03/1987DE3605350A1 Method for masking a message transmitted by radio
08/1987
08/27/1987WO1987005168A1 Multimode noise generator using digital fm
06/1987
06/16/1987US4673943 Integrated defense communications system antijamming antenna system
06/02/1987US4670885 Spread spectrum adaptive antenna interference canceller
05/1987
05/26/1987CA1222288A1 Programmable interference blanking system
04/1987
04/14/1987US4658436 Disguised transmission system and method
04/14/1987US4658099 Apparatus and method for remotely determining the presence of unauthorized surveillance devices on a communications line
04/09/1987WO1987002141A1 Compressive receiver having pulse width expansion
03/1987
03/24/1987US4653053 Performance monitoring of antijam satellite communication network
03/17/1987US4651204 Jamming signal generating circuit
03/12/1987DE3443150A1 Device for storing and delaying an RF input signal
02/1987
02/17/1987US4644299 Multimode noise generator using digital FM
02/04/1987EP0082055B1 Method of establishing communications in a transceiver network using frequency hopping, and apparatus for carrying out this method
01/1987
01/20/1987US4638494 System for the acquisition of code signals
09/1986
09/24/1986CN85102701A Method of restricting interference pulse
09/16/1986US4612546 Satellite command link protection system
08/1986
08/28/1986WO1986005050A1 Spread spectrum adaptive antenna interference canceller
08/20/1986EP0191488A2 Unit for preventing an interception of a radio communication signal transmitted between a fixed facility and a mobile station
04/1986
04/22/1986US4584578 Programmable interference blanking system
04/22/1986CA1203576A1 Military radar - or radio communications transmission system
04/08/1986US4581767 Measurement of jamming effectiveness by cross correlation techniques (C)
03/1986
03/25/1986US4578817 Method for establishing communications in a network of frequency-jumping transmitter-receiver stations and a station for the utilization of said method
11/1985
11/19/1985CA1196963A1 Military communications system
09/1985
09/17/1985CA1193667A1 Method of and system for safeguarded transmission of digital signals
05/1985
05/07/1985CA1186742A1 Interference cancelling system for a mobile subscriber access communications system
04/1985
04/30/1985US4514852 Process for protected transmission of digital signals
04/23/1985US4513249 Method and apparatus for signal detection, separation and suppression
02/1985
02/05/1985US4498193 Jammer transmitter
07/1984
07/03/1984CA1170364A1 Memory buffer
03/1984
03/27/1984US4439767 Lightweight optical jammer system
03/20/1984CA1164092A1 Apparatus for simulating interference transmissions
02/1984
02/28/1984US4434505 Interference cancelling system for a mobile subscriber access communications system
01/1984
01/18/1984EP0098630A1 System for the transmission of speech through a disturbed transmission path
01/17/1984CA1160722A1 Control device for steerable null antenna processor
12/1983
12/27/1983US4423505 Cued adaptive canceller
09/1983
09/13/1983US4404426 Cryptographic telegraphy programming system
08/1983
08/16/1983US4399556 Device for locating audio surveillance apparatus
08/03/1983EP0084967A2 Radio communication system
08/02/1983US4396917 Countermeasures system
07/1983
07/07/1983WO1983002374A1 Apparatus for detecting use or installation of a surveillance device
06/1983
06/22/1983EP0082055A1 Method of establishing communications in a transceiver network using frequency hopping, and apparatus for carrying out this method
06/14/1983US4388723 Control device for steerable null antenna processor
06/07/1983CA1147545A1 Process of opacification of a gaseous medium in the optical and infrared bands of the electromagnetic spectrum, and its application to an electro-optical counter-measure device
03/1983
03/23/1983EP0074657A1 Method of securing the transmission of digital signals
01/1983
01/25/1983US4370655 Combined side lobe canceller and frequency selective limiter
12/1982
12/07/1982US4363130 Binary digital communication system
11/1982
11/02/1982US4357709 Apparatus for regenerating signals within a frequency band
08/1982
08/24/1982US4346475 Data transmission system operating on the spread spectrum principle
07/1982
07/27/1982US4342119 Multi-tone jammer
07/27/1982US4342097 Memory buffer
06/1982
06/08/1982US4334322 Communication management system for providing antijam/privacy capabilities for voice radio communications
05/1982
05/25/1982US4332032 Adaptive hybrid antenna system
05/04/1982US4328591 Method and apparatus for signal detection, separation and suppression
05/04/1982US4328117 Diffusing an aerosol of boron trichloride to attenuate electromagnetic waves; screening of targets from electrooptically-controlled weapons
03/1982
03/09/1982US4319358 Information transmission
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