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7602331 |
Computationally efficient adaptive radar pulse compression system
One aspect of this disclosure relates to a method for processing a received, modulated radar pulse to resolve a radar target from noise or other targets. According to an embodiment of the method, a...
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7564400 |
Spread spectrum radar apparatus
It is an object of the present invention to prevent the sensitivity of radar apparatus from falling. A spread spectrum radar apparatus which detects an object, includes a carrier wave oscillator...
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7548195 |
Waveform generation method, radar device, and oscillator for radar device
It is possible to generate D/A conversion voltage in which an error generated by numeric irregularities of a D/A conversion element such as resistor constituting a D/A converter 11 is corrected....
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7535408 |
Apparatus and methods for detection of multiple targets within radar resolution cell
A method and apparatus is operative for multiple target detection in a radar system which employs a radar waveform of two or more frequency diverse subpulses. The apparatus adds coherent processing...
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7511665 |
Method and apparatus for a frequency diverse array
Method and apparatus for a frequency diverse array. Radio frequency signals are generated by a plurality of independent waveform generators and simultaneously applied to a transmit/receive module....
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7495598 |
Methods and systems for avoidance of partial pulse interference in radar
Systems and methods for avoidance of partial pulse interference in radar. The systems and methods include a radar processor for generating control signals that direct the generation and...
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7319427 |
Frequency diverse array with independent modulation of frequency, amplitude, and phase
Method and apparatus for a frequency diverse array. Radio frequency signals are generated and applied to a power divider network. A progressive frequency shift is applied to all radio frequency...
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7151483 |
System and method for concurrent operation of multiple radar or active sonar systems on a common frequency
A system and corresponding method for the concurrent operation of multiple radar systems on a common frequency and in the same geographical area includes a waveform generator that specifies certain...
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7148841 |
Radar device
A radar device includes a code generator, a transmission section, a reception section, a delay section, a despreading process section, a correlation value detection section, a target detection...
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7081850 |
Coherent detection of ultra wideband waveforms
A general purpose system and method for transmitting and coherently detecting UWB waveforms is predicated on the formation of conjugate pair of UWB waveforms. The in-phase and conjugate quadrature...
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7064705 |
Method of and apparatus for increasing the peak output pulse power delivered by capacitor-driven high-power diode and square-loop saturable reactor pulse compression generators with the aid of minority carrier sweep-out circuits within the pulse compression circuit
A technique and apparatus for increasing the peak output pulse power of a capacitor driven high-power diode and square-loop saturable reactor pulse compression generator or transmitter (such as a...
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6989782 |
Ultra-wideband radar system using sub-band coded pulses
Methods and apparatus are provided for radar systems using multiple pulses that are shorter than the expected range delay extent of the target to be imaged. In one implementation, a method for...
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6965341 |
High resolution SAR processing using stepped-frequency chirp waveform
A stepped-frequency chirped waveform improves SAR groundmapping for the following reasons. Range resolution in SAR image is inversely proportional to the transmitted signal bandwidth in nominal SAR...
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6933880 |
Programmable source of pulse trains on intermediate frequency and IFF emitting assembly using it
The invention relates to a pulse-modulated source with adjustable parameters and to its use in an IFF or secondary radar emitting assembly. The architecture of currently used IFF emitting...
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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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6859165 |
Pulse radar device
A pulse radar device includes a rectangular signal generating section for generating a rectangular signal that is a reference signal; a transmit timing voltage setting section for setting a voltage...
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6693582 |
Radar device and method for coding a radar device
A radar system having an arrangement for producing a code, an arrangement for modulating a transmission signal in a transmit branch, using the code, an arrangement for delaying the code, an...
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6486827 |
Sparse frequency waveform radar system and method
A radar for locating and tracking objects based on the use of a pulsed waveform, each pulse of the pulsed waveform being made up of a plurality of spectral components having different frequencies,...
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6381261 |
Random pulse type radar apparatus
A random pulse type radar apparatus sends out as an output signal a spectrum spread radio wave including a pseudo random signal-less period and receives echoes in this signal-less period to thereby...
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6236353 |
FM modulation technique for producing frequency rejection bands
Presented in this invention is a technique for producing a null in the frequency spectrum of an FM signal pulse, the null matching an interference that has been superposed on the signal pulse. By...
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6195036 |
Pulse radio-localization system
A pulse radar system includes a frequency-agile magnetron comprising an input for giving a feeding voltage of a magnetron tuner. A modulator connected to said magnetron forms pulses of a feeding...
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6147638 |
Method for operating a radar system
In a method for operating a radar system, the object is to determine by simple means and at low cost the distance and/or the radial velocity of at least one target object with high resolution. For...
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6091356 |
Chirp source with rolling frequency lock for generating linear frequency chirps
A source for a linear homodyne transceiver that generates repeated linear chirps. A YIG oscillator with a main coil and an FM coil receives a basic linear current ramp at the main coil to generate...
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5945941 |
Pulsed radar apparatus and method employing power distribution system having reduced cost and weight and enhanced efficiency and reliability
A power distribution system (12) is provided in radar apparatus to distribute power from a 270 VDC source (60) through an intermediate power converter (70) and very high frequency (VHF)...
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5841813 |
Digital communications system using complementary codes and amplitude modulation
The encoding/transmission of information in an OFDM system is enhanced by using complementary codes and different patterns of amplitude modulation representing respective data words. The...
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5777574 |
High resolution imaging radar linear frequency modulation bandwidth multiplier
An apparatus and method of linear frequency modulation waveform bandwidth multiplication including a digital linear frequency modulation waveform synthesizer for generating a synthesized waveform...
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5517197 |
Modular radar architecture film (FM/CW or pulse) for automobile collision avoidance applications
A modular radar system using both FM/CW and pulse waveforms for automotive collision avoidance applications. The radar system comprises a transmit and a receive antenna for transmitting and...
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5515011 |
Pulsed magnetron circuit with phase locked loop
A semiconductor diode is connected across the cathode-to-anode path of a magnetron and through a storage capacitor and collector resistor to a supply voltage for enabling charging of the capacitor....
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5469479 |
Digital chirp synthesizer
A monolithic digital chirp synthesizer (DCS) chip using GaAs/AlGaAs HI 2 L technology. The 6500 HBT gate DCS chip is capable of producing linear frequency modulated (chirp) waveforms or single...
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5469167 |
Synthetic aperture radar for nonlinear trajectories using range relative doppler processing and invariant mapping
Synthetic aperture radar imaging for nonlinear trajectories utilizing range relative doppler processing, invariant mapping of information from arbitrary shaped cells onto an X--Y coordinate system,...
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5428361 |
Large time-bandwidth chirp pulse generator
Low time-bandwidth product linear frequency modulated chirp pulses are repetitively generated as contiguous subpulses to form a pulse of extended duration with each subpulse respectively mixed with...
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5389933 |
Linear pulse compression radar system and method
A method is described for improving the target-detection performance of a linear pulse compression radar system by reducing the amplitude of the temporal sidelobes contained in the autocorrelation...
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5347283 |
Frequency agile radar
A radar transmitter in which a pseudo-random sequence of pulses are transmitted, each at a different frequency. Prior to the return of the first pulse, a receiver is retuned to the first transmit...
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5347281 |
Frequency-coded monopulse MTI
A pulse-compression, MTI, doppler-radar system for determining target velty information from a single, frequency-coded uncompressed target-return pulse includes a coded modulator, two pulse...
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5321409 |
Radar system utilizing chaotic coding
A radar system (20) has a chaotic code source (22) with a chaotic code output (23), which generates a chaotic code according to a chaotic difference equation. The radar system (20) further includes...
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5313214 |
Scaled multiple function nonlinear FM waveform
Scaled multiple function non-linear FM waveforms are generated for use in digitally implemented low frequency radar. The non-linear FM waveforms are generated by combining a plurality of functions,...
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5311193 |
Digital chirp generator
A digital chirp generator for generating linear frequency modulated signals, comprises a plurality of frequency/phase accumulators pipelined together. Each frequency/phase accumulator includes a...
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5294933 |
Wideband radar system utilizing adaptive interference canceler
A wideband radar apparatus is provided having improved interference suppression characteristics. The known time versus bandwidth characteristic of the transmitted pulse is utilized to effect...
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5289192 |
Signal processing method for a radar system
The present invention relates to a signal processing method for a radar system. The transmitted signal here includes a polyphase code that is optimized to the desired range/Doppler range and that...
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5278567 |
Post detection integration method and apparatus for pulse compression radar utilizing surface acoustic wave (SAW) matched filters
Received expanded radar pulses pass through a surface acoustic wave (SAW) weighted filter (64) for sidelobe suppression, and then into a SAW tapped delay line (66). The pulses appear at the taps...
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5239309 |
Ultra wideband radar employing synthesized short pulses
An impulse radar that forms a predetermined radar pulse train in space by transmitting individual spectral components thereof. Thus, a train of extremely short pulses is obtained without switching...
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5229775 |
Digital pulse compression apparatus
A digital pulse compression apparatus comprises a plurality of doppler correction circuits for carrying out doppler correction in the time domain or the frequency domain and for carrying out pulse...
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5223838 |
Radar cross section enhancement using phase conjugated impulse signals
An apparatus and a method for enhancing the radar cross section of a target. The present invention is an impulse radar system that implements a method that comprises the following steps. A pilot...
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5192956 |
Cascaded complementary phase code compressor
The present invention is a system that performs code compression in stages where each stage includes two processing paths 36 and 38. The two paths allow bidirectional crossover cascade...
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5146616 |
Ultra wideband radar transmitter employing synthesized short pulses
A predetermined radar pulse train is formed in space by transmitting individual spectral components thereof. Thus, a train of extremely short pulses is obtained without switching a radio frequency...
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5140332 |
Short pulse radar system with a long pulse transmitter
A radar system is disclosed which includes a transmitter which produces a long coded radar pulse. The return of the long coded radar pulse is compressed by a long pulse compression filter to...
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5130714 |
Stretch and chirp waveform format for reduced generating and receiving hardware complexity
Unique stretch and chirp waveform formats are described which allow significant simplification of radar signal generation and receive processing hardware. The new formats produce a non-zero...
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5128681 |
Multi-pulse pulse compression radar system
A multi-pulse pulse compression radar system transmits two or more radar pulses having different frequency components having a time delay therebetween. A signal conditioning stage time and phase...
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5115247 |
Frequency modulated, phase coded radar
A radar ranging system is disclosed which employs a frequency modulated and phase coded transmission signal which can have up to a 100 percent duty cycle and which performs time tracking of the...
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5107272 |
Radar system employing injection locked transmitter stage
A radar transmitter chain employing injection locked oscillator, e.g., a magnetron, as an output stage. Problems arise with maintaining the injection locking bandwidth centered on the radar source...
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