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7184493 |
Pulse sorting apparatus for frequency histogramming in a radar receiver system
Disclosed is a real-time pulse sorting apparatus of a preprocessor in a pulsed radiation detection system. The apparatus, responsive to digital signals generated by a system receiver, uses the...
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7024188 |
Wireless communications system with detection of foreign radiation sources
The invention discloses a method for use in a wireless communications system with a plurality of broadcasting nodes, comprising the step of enabling one node in the system to function as a central...
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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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6937639 |
System and method for positioning pulses in time using a code that provides spectral shaping
A system, method and computer program product for positioning pulses, including positioning pulses within a specified time layout according to one or more codes to produce a pulse train having one...
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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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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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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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6639541 |
Device and method for detecting, measuring, and reporting low-level interference at a receiver
An inexpensive, reliable apparatus and method for autonomously monitoring, measuring the incident level, recording, comparing, reporting, and optionally displaying an indication of intentional or...
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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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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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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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5892477 |
Anti-jam FM/CW radar
A radar system (10) uses independent, adaptive modulation controls for the local oscillators (16, 40) in the transmitter (24) and receiver (26) portions. The adaptive modulation enables the radar...
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5539407 |
Radar apparatus provided with ECCM facilities
A radar apparatus that is provided with auxiliary antennas (5, 10) of an omnidirectional nature. In addition to customary ECCM applications, such as side-lobe suppression and side-lobe blanking,...
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5537117 |
Closed loop countermeasure to passive direction finding and location of radar transmitters using Doppler techniques
Method and apparatus for enabling a pulse echo radar to generate a false signal in both time and frequency based passive Doppler ESM location systems. The latter false signal causes the ESM system...
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5534867 |
Open loop countermeasure to passive direction finding and location of radar transmitters using Doppler techniques
A method and apparatus for controlling the output characteristics of a radar emitter for thereby preventing the location of the emitter using Doppler techniques. The emitter's RF frequency and PRF...
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5438332 |
Method of hardening transmissions, in particular between a control station and a transponder, and a device implementing the method
To harden transmissions, in both directions, between a master station (1) and a slave station (2), a table of communication parameter values is memorized in each station and the table values are...
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5311541 |
Frequency agile radio
A frequency agile spread spectrum radio system which is capable of efficient frequency re-use and frequency sharing. The receiver adaptively learns which frequencies to avoid. The transmitter sends...
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5291202 |
Noise radars
In a noise radar a pseudo-random sequence is generated repeatedly and used to phase modulate a transmitted signal. The transmission is interrupted during a number of periods during each...
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5168215 |
Instantaneous frequency measurement apparatus and method
An apparatus and method for measuring the frequencies of a pair of signals simultaneously present in a composite signal, comprising the steps of includes components for squaring the composite...
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5099243 |
Digital frequency measurement receiver with bandwidth improvement through multiple sampling of complex signals
This is a technique for extending the frequency range which employs in-phase and quadrature components of the signal coupled with non-uniform sampling to gain the advantages of a high sampling rate...
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5099194 |
Digital frequency measurement receiver with bandwidth improvement through multiple sampling of real signals
This proposed approach to extending the frequency range uses non-uniform sampling to gain the advantages of a high sampling rate with only a modest increase in the number of samples. The basic idea...
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5017921 |
Radar system and a method for operating a radar system
A radar system and a method of operating a radar system. The radar system comprises a transmitter-receiver subsystem to transmit a series of electromagnetic pulses, to scan those pulses across an...
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4996532 |
Digital beam forming radar system
A radar system having improved interference resistance. A transmitting section includes an oscillator capable of switching the oscillation frequency, and a transmitting antenna connected to said...
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4358766 |
Jamming signal reduction system
Improved radar system performance in a jamming environment is achieved by making a complete frequency analysis of the jamming power entering the radar receiver during each range sweep (once per...
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4328497 |
Method and system for jamming analysis and transmission selection
A jamming analysis and transmission selection system for a radar wherein the frequencies present in the environment are sampled during a discrete time interval following each radar transmission;...
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4135189 |
Random frequency radar system
1. A variable frequency pulse radar system comprising: A transmitter, a receiver and means for initiating successive radar transmission-reception cycles at successive frequencies; listening means...
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3992709 |
Doppler radar
A Doppler radar for use in a vehicle for predicting a collision with another vehicle, capable of detecting noise due to a false wave i.e., the transmitted wave from another vehicle having a...
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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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3916406 |
Jamming cancellation device
1. In a system for decreasing the effect of interference signals on radar eration, the combination comprising; Interference signal detection means having a long response time to incoming signals,...
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3648287 |
FREQUENCY ADAPTIVE TRANSMITTER TO AVOID JAMMING
A frequency adaptive transmitter to avoid jamming wherein a combination of a frequency agile transmitter, a balanced amplifier and a directionally sensitive antenna senses that it is being jammed...
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3164832 |
If sidelobe cancellation
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3115629 |
Repetitive signal systems for improving signal to noise ratio
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2986731 |
Pulse radar system
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2862203 |
Arrangement in a radar station
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