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6166682 |
Radar device and object detection method
A radar device capable of discriminating a person possessing metals from a person having no metals by transmitting a radio wave includes a voltage controlled oscillator for generating a radio wave,...
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6166678 |
Fourier-transform-based adaptive radio interference mitigation
A signal process is provided for radar interference mitigation in SAR data and to perform several functions. Initially, the algorithm separately removes the average range bias of the I-channel and...
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6166677 |
Image synthesizing method using a plurality of reflection radar waves and aircraft image radar apparatus using the method
The present invention provides a small-size image radar apparatus to be mounted on an aircraft, having a high resolution not only the flying direction but also in the direction vertical to the...
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6163292 |
Method of determining the ability of a medium to absorb electromagnetic waves and a sensor for detecting foreign bodies in the medium
A method of determining the ability of a medium to absorb electromagnetic waves including placing antenna unit (10) having spaced transmitting and receiving antennas (2 and 3) on a limiting surface...
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6163293 |
Radio wave receiving apparatus having an improved antenna resolution
A radio wave receiving apparatus including having improved antenna resolution. The apparatus includes a signal processing circuit; a circuit for performing the Fourier transform with respect to an...
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6137439 |
Continuous wave doppler system with suppression of ground clutter
In a continuous wave Doppler system in which a fixed transmitter transmits a continuous wave signal to be reflected by moving targets and by fixed structure, an aircraft receives the reflective...
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6127965 |
Method and apparatus for rejecting rain clutter in a radar system
A method and apparatus for detecting the presence of objects in a vehicle operator's blind spots. The apparatus comprises a side-facing Doppler radar system using continuous wave (CW) transmission...
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6121917 |
FM-CW radar
In an FM-CW radar, a receive section has an array antenna in which a plurality of element antennas are arrayed as receive antennas, and a plurality of mixers for generating a beat signal of each...
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6107957 |
Radar level gauge
A FMCW radar tank level gauge (14) that measures a level (13) in a tank (10) by obtaining a set of phase shift data points of mixed transmitted waves and received waves. The set of spectral data...
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6087981 |
Method for pulse compression with a stepped frequency waveform
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6078281 |
Signal processing architecture which improves sonar and pulse Doppler radar performance and tracking capability
A Fast Fourier Transformation (FFT) processing is disclosed that measures FFT output phase standard deviation over a number of consecutive FFT runs. The system corrects FFT output phase in an...
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6075480 |
Down range returns simulator
A down range returns simulator for generating simulated radar reflected returns for testing advanced radar waveforms and associated signal processing. The simulator generates return signals based...
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6072419 |
Method for the processing of the reception signal of a deramp type synthetic aperture radar
A Deramp type radar used in synthetic aperture radar for radar imaging transmits coherently repeated linear frequency-modulated pulses and carries out a sort of pulse compression in reception by...
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6064334 |
Clutter resistant target detector
A ranging device is disclosed that monitors for changes in a scene of interest. The ranging device includes a transmitter that sends pulses into the scene, a receiver that generates pulse samples...
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6051027 |
Efficient three dimensional extraction
A layered structure is divided into a plurality of regions. Transmission line equivalents (Green's functions) in the spectral domain are formed between all regions within the layered structure. The...
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6040796 |
Radar system installable in an automotive vehicle for detecting a target object
A modulation signal generating section produces a modulation signal for controlling an oscillation frequency of a voltage-controlled oscillator. The modulation signal generating section comprises a...
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6031485 |
Digital bi-static spread spectrum radar
A bi-static spread spectrum digital radar including a transmitting antenna and a receiving antenna array separate from and positioned at a distance from the transmitting antenna. The transmitting...
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6023236 |
Speedometer assisted patrol speed search for DSP traffic radar
A digital signal processor (DSP) traffic radar utilizing pulses from the patrol vehicle's electronic speedometer to steer the DSP's search of Doppler return information for the patrol vehicle's...
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6023235 |
Method for generating microwave-resolution images of moving objects by inverse synthetic aperture radar
A method of radar imaging moving objects, especially ground traffic at airports, uses inverse synthetic aperture radar (ISAR). The two-dimensional location distribution of backscatter centers of...
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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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6018311 |
Noncoherent gain enhancement technique for improved detection-estimation performance
A system and method of processing data in a sensor system which receives signal returns from pulsed coherent transmitted signals which are transmitted at a pulse repetition rate and with a pulse...
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6018306 |
Scalable range migration algorithm for high-resolution, large-area SAR imaging
An improved range migration algorithm or processing method that advantageously performs digital synthetic aperture radar image formation processing. The range migration algorithm provides...
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5990823 |
Wavelet-based radar
Method and apparatus for developing high range resolution radar target profiles. An outgoing radar waveform is encoded with coefficients corresponding to a wavelet transformation and then...
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5990831 |
FFT implementation of digital antenna arry processing in GNSS receivers
Disclosed are global navigation satellite system (GNSS) receivers, including digital spatial nulling arrays, and a method of providing antenna pattern outputs using the same. The digital spatial...
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5982319 |
UHF synthetic aperture radar
A synthetic aperture radar (SAR) which operates at UHF frequencies and which includes a two element antenna. The SAR generates a null in the backlobe of the antenna pattern at the location of a...
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5977905 |
Target detection method and device for wideband unambiguous pulse Doppler radar
Coherent bursts of N wideband, low repetition frequency width-modulated pulses are transmitted, and they are received with pulse compression and then sampling. For each range gate and each speed...
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5963164 |
Monobit kernel function electronic warefare receiver for characterizing two input signals
A broadband gigahertz frequency range radio receiver useful in electronic warfare and other applications for incoming signal detection and identification purposes. The receiver is based on Fourier...
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5943006 |
RF image reconstruction and super resolution using fourier transform techniques
Special mathematical techniques are used to process accurate energy measurements in the focal plane of a high quality imaging system to produce high resolution images. The improved resolution...
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5940445 |
Method and apparatus for providing transmit diversity in a wireless communication system
The wireless communication system transmits signals using radios (205). The radios (205) receive a signal which is formatted for transmission (602). The formatted signals from the radios (205) are...
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5936576 |
Measurement of amplitudes and phases of signals at a high speed and with high reliability
A multi-input amplitude and phase measuring method is disclosed for measuring the amplitudes and the phases of measurement signals at a high speed and with a high degree of reliability. Measurement...
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5933446 |
Beamformer with adaptive processors
The Beamformer with Adaptive Processors is a practical joint spatial-templ processor suitable for combining multiple antenna signals for a communications receiver. The invention identifies a beam...
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5923279 |
Method of correcting an object-dependent spectral shift in radar interferograms
A method of correcting an object-dependent spectral shift in radar interferograms has two main procedures. In the first, the phase of the interferogram is reconstructed through phase unwrapping and...
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5923283 |
Altimetric type measurement method for use on a satellite
An altimetric type measurement method for use on a satellite transmits a pulse towards the surface of the sea and carries out frequency transformation on the return signal resulting from the...
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5910785 |
Method for the processing of the reception signal of a synthetic aperture radar with frequency ramps
A Deramp type radar used in synthetic aperture radar for radar imaging transmits coherently repeated linear frequency-modulated pulses and carries out a sort of pulse compression in reception by...
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5905458 |
FM radar apparatus
An FM radar apparatus detects a distance to and/or a speed of a target not only from peak frequencies of beat signals in respective frequency rise and fall regions but also by reusing the peak...
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5872535 |
Removing buoy motion from wind profiler moment
The present invention provides an apparatus and method for correcting buoy motion in Doppler moment estimates. In the present invention, it is assumed that the buoy is stationary over short periods...
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5861835 |
Method to improve data obtained by a radar
A method of improving data obtained by radar by interpolation over frequency bands jammed by narrow-band interference, at which the following steps (A)-(J) are carried out. (A) It is determined...
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5854602 |
Subaperture high-order autofocus using reverse phase
A high-order synthetic aperture radar (SAR) autofocusing method decomposes phase error into basis function components, one order at a time. Image patches are partitioned into a plurality of...
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5850202 |
Method for improving SAR system sensitivity in the presence of RF interference
The sensitivity of a synthetic aperture radar (SAR) system employing stretch processing is improved in the presence of radio-frequency interference (RFI). The sequence of data processing operations...
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5841395 |
Localized interference nulling preprocessor
A localized interference nulling preprocessor for a Fast Fourier Transform (FFT) or a Butler matrix system includes a means for forming a dot product of a signal vector and each of the preprocessed...
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5835054 |
Ultra wideband ground penetrating radar imaging of heterogeneous solids
A non-invasive imaging system for analyzing engineered structures comprises pairs of ultra wideband radar transmitters and receivers in a linear array that are connected to a timing mechanism that...
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5812083 |
Non-cooperative target identification using antenna pattern shape
A method of classification of a device by recognizing distorted signals, generally a RF antenna pattern, emanating therefrom wherein a trainable recognition system, preferably a neural network, is...
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5812082 |
Method for azimuth scaling of SAR data and highly accurate processor for two-dimensional processing of scanSAR data
In a method for azimuth scaling of SAR data without interpolation, raw SAR data in azimuth are multiplied with a phase function H 5 (f a ;r o ), where f a denotes the azimuth frequency and r o ...
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5805106 |
Dual polarization wave clutter reduction
A system 10 for reducing clutter in passive radiometric images of the ocean surface, the system including: a first polarizer 12 for generating a vertically polarized image of a selected patch of...
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5805107 |
Cost-effective method for determining a pulse response of a high-resolution, band-limited radar channel
For less expensive estimation the impulse response x MOS of a high-resolution, band-limited radar channel in a radar station operating with an expanded transmitted pulse a(t), from a received...
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5796363 |
Automatic position calculating imaging radar with low-cost synthetic aperture sensor for imaging layered media
An imaging system for analyzing structures comprises a radar transmitter and receiver connected to a timing mechanism that allows a radar echo sample to be taken at a variety of delay times for...
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5793323 |
Two signal monobit electronic warfare receiver
A broadband gigahertz frequency range radio receiver useful in electronic warfare and other applications for incoming signal detection and identification purposes. The receiver is based on Fourier...
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5784026 |
Radar detection of accelerating airborne targets
Radar detection of accelerating airborne targets in accordance with the present invention utilizing a sequence of velocity, acceleration matched filters. This system includes a transmitter...
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5757309 |
Spatial frequency feature extraction for a classification system using wavelets
An iterative process to determine the wavelet function and combination of ales of the function which provides data where there is a large separability compared to the separability of the data set...
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5757307 |
Radar system for detecting distance, mutual speed and azimuth of a target obstacle
Receivers 14 and 16 comprise mixers 14b and 16b for mixing reception signals of receiver antennas 14a and 16a with a transmission signal to generate beat signals B1 and B2, respectively. Signal...
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