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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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7498978 |
Radio frequency and microwave signals
A device for generating high powered Radio Frequency (RF) or microwave signals comprising a fast rise-time video pulse generator, a modulator to modify the generated UWB pulses by gyromagnetic...
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7474257 |
Multistatic adaptive pulse compression method and system
A radar receiver system includes a receiver, a processor, and a detector. The processor is programmed with a Multistatic Adaptive Pulse Compression (MAPC) algorithm for estimating adaptively a...
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7450059 |
Non-linear dispersive transmission line assembly
A non-linear dispersive transmission line assembly for producing high power radio frequency electrical signals includes a transmission line ( 6, 7 ) having a plurality of series connected inductors...
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7365603 |
FET amplifier, pulse modulation module, and radar device
An FET amplifier includes an FET for amplifying a high-frequency signal to be input to the gate on the basis of a gate bias voltage from a gate bias control circuit. In the FET amplifier, a...
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7239268 |
Method and apparatus for minimizing the number of power amplifiers required under multiple transmission conditions
The number of power amplifiers required to amplify a plurality of transmission signals is reduced by using non-linear transmission lines (NTL) circuits. In general, a “combining” NTL circuit is...
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7212154 |
Apparatus for producing an amplified radio frequency pulse
Apparatus for producing an amplified Radio Frequency pulse includes a controller for monitoring the output amplified pulse and determining therefrom a correction for a deviation in the...
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7196658 |
Waveform generation method, waveform generation program, waveform generation circuit and radar device
A conventional waveform generation circuit was required to increase a number of bits or a sampling rate for a D/A converter to enhance a precision of waveform shaping, and had a problem that a cost...
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7170444 |
Non-linear dispersive pulse generator
A non-linear dispersive pulse generator for producing pulsed radio frequency electrical signals includes a non-linear dispersive electrical circuit ( 1 ) incorporating at least one non-linear...
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7167125 |
Pulse radar arrangement
A pulse radar system has a high-frequency source, which supplies a continuous high-frequency signal and is connected on the one side with a transmission-side pulse modulator and on the other side...
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7158077 |
Radar device and method for suppressing interference with a radar device
A radar device is described having an arrangement to generate a carrier signal having a carrier frequency f T , an arrangement to generate pulses having a pulse repetition rate f PW , an...
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7151484 |
Pulse compression processor
A pulse compression processor 20 compressing a modulated pulse signal correlately received by a receiver, includes a coefficient calculator 30 calculating a set of filtering coefficients for...
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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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7106250 |
Robust predictive deconvolution system and method
A method for processing a received, modulated pulse (i.e. waveform) that requires predictive deconvolution to resolve a scatterer from noise and other scatterers includes receiving a return signal;...
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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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6943640 |
Current source modulator
A current source modulator ( 202; 302, 502 ) provides power to radar transmitters. The modulator comprises a power supply ( 210, 310, 510 ) providing, when enabled, a known current to a storage...
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6940450 |
Robust predictive deconvolution system and method
A method for processing a received, modulated pulse (i.e. waveform) that requires predictive deconvolution to resolve a scatterer from noise and other scatterers includes receiving a return signal;...
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6940449 |
Method for eliminating dummy objects short-range pulse radar sensors
In order to create a method for eliminating dummy objects in short-range pulse radar sensors, in which radar pulses are transmitted at a defined frequency, and the time until they are reflected by...
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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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6917327 |
Adding error correction and coding to a radar system
A method for transmitting a radar signal comprises the step of transmitting a series of pulses, each of the pulses being separated in time by an interpulse period, and each of the pulses in the...
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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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6844842 |
Method for pulse width modulation of a radar system
A radar system is operated by controlling and thereby limiting the mean power of the transmitted signal in response to the mean power of the received signal thereby limiting the power to a...
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6744402 |
High-frequency diode oscillator and millimeter-wave transmitting/receiving apparatus
An object of the present invention is to facilitate positioning of a metal member for mounting a high-frequency diode and of a dielectric strip, thereby remarkably improving control of oscillation...
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6720909 |
Radar apparatus
A radar apparatus provided with a transmitter for periodic transmission of mutually disjunct groups of N radar transmitter pulses and provided with a receiver for the receipt of echo signals of the...
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6700532 |
Magnetron drive circuit
The invention provides a magnetron drive circuit which drives a magnetron to produce a generally rectangular-shaped narrow transmission pulse having sharply shaped rising and falling edges. The...
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6697011 |
Doppler radar device
A doppler radar device having comparing means 142 for comparing the level of pulse signal to be transmitted, sampled through a burst gate, with a predetermined threshold value and search means ...
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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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6668008 |
Ultra-wide band communication system and method
A system and method for generating an ultra-wide band communication signal having data occurring a specific frequencies precisely excised at baseband. The data to be transmitted is transformed into...
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6563450 |
Shipboard point defense system and elements therefor
A combined defense and navigational system on a naval vessel is disclosed. The disclosed system includes a track-while-scan pulse radar which is controlled to provide either navigational...
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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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6459404 |
DDS spur mitigation in a high performance radar exciter
A technique is described for providing a pulsed radar exciter signal, in a radar exciter including a direct digital synthesizer (DDS). The DDS is reset pulse-to-pulse to provide a pulsed DDS signal...
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6392588 |
Multifrequency signal structure for radar systems
A multifrequency phase-coded signal structure is presented for use in a system like a radar or sonar or detecting a remote target. The signal structure comprises at least one pulse signal in the...
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6384773 |
Adaptive fragmentation and frequency translation of continuous spectrum waveform to make use of discontinuous unoccupied segments of communication bandwidth
Identity transform filters, such as sin(x)/x filters, are used to coherently fragment the frequency continuum of a wideband waveform, such as an ultra wideband radar signal, into a plurality of...
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6342851 |
Method and arrangement for duty cycle enlargement
The duty cycle of a pulse train from a pulse radar antenna is increased by dividing the antenna aperture into sub-apertures ( 1-5 ), generating separate pulse trains from said sub-apertures ( 1-5...
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6339394 |
Digital coherent radar
The digital coherent radar generates its transmitted waveform from a low intermediate frequency (IF) and a local oscillator (LO) by digitally generated waveforms after passing through...
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6281835 |
Radar transmitter
The invention relates to solid-state radar transmitter, comprising a number of amplifier modules (4.i). To prevent the trailing edge of a steer pulse supplied to the radar transmitter from becoming...
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6208285 |
Pulse compressor for doppler tolerant radar
A radar system employing Doppler tolerant radar pulses such as linear FM or hyperbolic FM chirps includes a pulse compressor configured as a digital finite impulse response filter. In one...
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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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6097329 |
Meteorological radar apparatus
A meteorological radar apparatus which calculates a shift of the pulse synchronization of a transmission pulse signal output from a transmission unit and corrects the transmission timing of the...
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6087981 |
Method for pulse compression with a stepped frequency waveform
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6067043 |
Pulse compression radar
The invention concerns a method of synthesizing a replica used in the compression filter of pulse compression radar. The replica is calculated from the spectrum of a required impulse response. The...
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6020843 |
Technique for implementing very large pulse compression biphase codes
A processing method for use in providing improved SAR imagery at high duty factors that provides for enhanced radar sensitivity. Radar signals are transmitted that embody a high duty factor...
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6002707 |
Spread signal spectrum communication circuits and system
The present invention provides a covert radar system in which radar signals emitted are capable to search receiver thermal noise and, therefore, are substantially undetectable in the normal radar...
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