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5751241 |
Method and apparatus for measuring the speed of a moving body
To measure the speed of a body (1) moving relative to the ground (2) by means of a broad-band Doppler radar (3) fixed to the moving body, two incident radar waves are transmitted successively...
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5751240 |
FMCW radar system for detecting distance, relative velocity and azimuth of a target obstacle
Beat signals of respective receiver channels CH1 and CH2, produced by mixing their receiving signals with a transmission signal, are subjected to Fourier transformation to detect the frequency and...
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5748143 |
Adaptive post-doppler sequential beam processor
A signal processing system applies space-time adaptive processing ("STAP") to an airborne surveillance Doppler radar comprised of a single-channel, rotating antenna. The STAP substantially improves...
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5745069 |
Reduction of radar antenna area
The traditional minimum antenna area limit for synthetic aperture radar (SAR), imposed by ambiguity considerations, is eliminated by using a transmitter format providing distinguishable sub-pulses....
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5736956 |
Unlocked W-band receiver with coherent features
A coherent radar receiver that has pulse-to-pulse coherence using an unlocked voltage controlled oscillator, such as a Gunn voltage controlled oscillator. The present invention is a W-band, for...
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5736957 |
Delay compensated doppler radar altimeter
A delay compensated Doppler radar altimeter which eliminates the relative delay curvature associated with the energy reflected by a scatterer located in the along-track direction of an aerial...
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5734347 |
Digital holographic radar
This invention generates a radar analog of the optical hologram by recording a radar image in the range/doppler plane, the range/azimuth plane, and/or the range/elevation plane according to the...
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5731778 |
FM-CW radar apparatus for measuring relative speed of and distance to an object
An FM-CW radar which is suitable for automotive anti-collision systems, for example, is provided. This radar outputs a radar signal in the form of a triangular wave whose frequency is increased at...
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5726657 |
Phase coherent radar system using fast frequency agile waveform synthesis
A radar system in which a frequency agile synthesizer is used to provide rapid frequency shifts and in which measures are taken to maintain phase coherency. The system is fully coherent such that...
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5694131 |
Method and apparatus for detecting multipath interference in a radar receiver
A method and apparatus for detecting the presence of multipath interference within a radar receiver disposed to form sum (Σ) and difference (Δ) signals by time-sampling a target return signal is...
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5689268 |
Radar detection and classification of helicopters
The blade flash signature in a radar return is enhanced and used to detect and classify helicopter targets. The radar return of a target is fast Fourier transformed 34, and the frequencies...
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5689444 |
Statistical quality control of wind profiler data
The quality of wind profiling radar data is evaluated by comparing the probability density function of the power density of sets of returned samples to an exponential function. The standard...
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5686922 |
Super spatially variant apodization (Super - SVA)
In systems wherein signal compression is performed using matched filters or transforms, as in the case of radar, multiple extrapolations are used to resolve beyond the limits of defraction. In one...
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5682165 |
Active array self calibration
A process for collecting phase and amplitude calibration data for an active array system without the use of external sensors. The relative phase and amplitudes of adjacent T/R modules are...
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5659318 |
Interferometric SAR processor for elevation
An interferometric Synthetic Aperture Radar (SAR) system having a special-purpose processor to integrate motion compensation, interferogram coregistration, and a spectral shifting for optimal...
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5644314 |
Portable geophysical system using an inverse collocation-type metehodology
The invention pertains to a hand-held or vehicle mountable portable procer based high resolution radar system for detecting and identifying an object by using high resolution radar. In particular,...
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5625362 |
Radar equipment and method for its operation
A cost-effective FMCW radar equipment has a digital signal processor which controls at least one antenna through an oscillator and produces a mixed signal from transmitted and received signals...
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5612700 |
System for extracting targets from radar signatures
The present invention discloses a system for extracting targets from radar signatures. Disclosed is a unique combination of Wavelet technology and neural networks using fractal geometry techniques...
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5608408 |
Method of sounding a channel
To reduce emission power, the sounding of a channel comprises a space-of-change transformation of M columns with N initial samples having equal time ranks in the last N impulse responses of a...
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5594451 |
Processing method using an advanced radar waveform for simultaneous matched processing and range profiling of different size targets
A method of processing radar returns derived from a new radar waveform. The method processes radar returns derived from transmitting the radar waveform to provide simultaneous matched processing...
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5592171 |
Wind profiling radar
Clutter present in radar return signals as used for wind profiling is substantially removed by carrying out a Daubechies wavelet transformation on a time series of radar return signals. The...
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5570093 |
Police traffic radar using absolute signal strength information to improve target signal processing accuracy
A police radar utilizing digital data transmission from the antenna unit to a separately housed counting and display unit. The antenna has a double balanced mixer to suppress even order harmonics....
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5568154 |
System and a method for the instantaneous determination of the frequencies and angles of arrival of simultaneously incoming RF signals
A system for the instantaneous determination of the frequencies and angles of arrival of a plurality of simultaneously incoming signals. The system includes beam network matrix for receiving the...
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5568151 |
Statistical averaging method for wind profiler doppler spectra
This method for Doppler spectral processing more readily identifies the profiler radar return signals from the atmosphere in the presence of contamination, e.g., from bird echoes, ground clutter,...
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5568150 |
Method and apparatus for hybrid analog-digital pulse compression
A method and apparatus for hybrid analog-digital pulse compression, as well as, a method of use and manufacture includes an analog intermediate frequency filter, a converter, and a digital...
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5563909 |
Radio communication system
A radio communication system for mobile communications, or more specifically, a radio receiver for a base station which receives signals transmitted from a plurality of mobile stations is provided...
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5561431 |
Wavelet transform implemented classification of sensor data
An improved classifier estimates a classification of a sensed object. Data representing the sensed object are received by a sensor, such as a radar, and transformed into wavelet transform...
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5546085 |
Separating coherent radio-frequency interference from synthetic aperture data
The data is processed using a quadratic phase removal process to remove quadratic phase variations contained in the interference to compress the interference to its narrowest extent in a range...
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5539409 |
Apparatus and method for windshear data processing
The present invention improves upon conventional windshear data processing techniques in three mutually exclusive aspects. First, the present invention provides an improved method and system for...
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5519402 |
Doppler shift compensation apparatus
A Doppler shift compensation apparatus for compensating Doppler frequency shifts in an incoming signal to reproduce a highly accurate signal. The Doppler shift compensation apparatus has high...
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5519399 |
Method for measuring the frequency of continuous wave and wide pulse RF signals
A method for measuring the frequency of continuous wave and wide pulse RF signals using multi-purpose, commercial-off-the-shelf test devices, such as an RF signal down converter, a digitizer and a...
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5510799 |
Method and apparatus for digital signal processing
A digital signal processing method and apparatus for beam forming utilizes an N-element phased array antenna (1). For transmit side beam forming of an agile beam to be steered in a direction...
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5497161 |
Angle of arrival (AOA) solution using a single receiver
A solution to the AOA problem is provided, receiving the data via a plurality of antennas, which uses a switching network to couple the antennas to a single receiver and a single analog-to-digital...
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5483242 |
Method for measuring the distance and velocity of objects
In a method for measuring the distance and the velocity of objects employing electromagnetic waves, the frequency of an emitted signal is modulated. The signals received during one rise and one...
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5477230 |
AOA application of digital channelized IFM receiver
This system compares the phases from Fast Frequency Transform (FFT) outputs to obtain angle of arrival (AOA) information.
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5471435 |
Method for acoustic/electromagnetic signal processing
A process for predictively modelling potential fields in inhomogeneous media is particularly suited for implementation as a Digital Signal Processing chip, as it rapidly predicts the potential...
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5448241 |
Terrain height radar
A terrain height radar system and processing method comprising a high resolution synthetic aperture radar (SAR) mounted on an air vehicle and a SAR signal processor containing a signal processing...
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5448245 |
Signal processing apparatus in radar
The present invention relates to a signal processing apparatus for use in radars, which can detect a target from a receive signal by digital processing. An A-D converter samples the receive signal...
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5424749 |
Vibrating object assessment from a pulse operated vibrating sensor
A distant target vibration assessment and signature determining apparatus for operation from a vibrating platform such as an aircraft or helicopter. The disclosed system employs pulse illumination...
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5414428 |
Radar system with pulse compression and range sidelobe suppression preceding doppler filtering
A radar system transmits dispersed pulses, and receives echoes from targets. The echo signals are digitized and applied over a number of signal paths. In each signal path except one, the digitized...
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5412390 |
Apparatus and method for reducing co-channel interference from a radio frequency signal
A system for reducing co-channel interference includes a power spectrum analyzer which provides a spectral signal representative of an intermediate frequency signal from the receiver of a direction...
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5402131 |
Detection of radar targets using higher-order statistics
A signal detection system, preferably for use with a coherent radar system elects certain combination of input signal samples in a block of signal samples to derive a test statistic which is...
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5396250 |
Spectral estimation of radar time-of-arrival periodicities
Disclosed is a method to extract the periodic properties (or Pulse Repetition Intervals (PRIs)) of radar signals whose time-of-arrival at an airborne platform have been time tagged by an Electronic...
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5389931 |
Radar signal processing system
A conical scan radar system (10) provides return pulses (30) to an A/D converter (38) from which a shaped pulse train is received and stored in a FIFO memory (40). The stored pulse train is then...
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5361072 |
Gated FMCW DF radar and signal processing for range/doppler/angle determination
A lower-frequency compact radar system for wide-angle surveillance. Direction-finding receive antennas consisting of colocated orthogonal electric and magnetic dipoles provide target angles from...
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5349359 |
Spatially variant apodization
Spatially variant apodization is a digital image processing technique for eliminating sidelobes produced by Fourier transform of finite data sequences without compromising mainlobe width. This...
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5347282 |
Apparatus for the observation and indentification of helicopters
Apparatus for the observation and identification of helicopters by means of an FM-CW radar apparatus provided with transmitter means (1), antenna means (2) and receiver means (3). Blade flashes...
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5343208 |
Radar with individually optimized doppler filters
An FFT-like array architecture (500), for use on the Doppler filters of a radar system, includes a plurality of stages (505, 506) of weighted butterflies (501, 502, 503, 504), in which each...
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5339082 |
FM/CW sensor processor for target recognition
A processor for an FM/CW sensor divides the sweep periods of the sensor into a number of subsweep intervals, measures the received power within a multiplicity of frequency windows during each of...
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5329284 |
Radar apparatus
Radar apparatus provided with a transmit generator and antenna means for the transmission of comparatively long, linearly frequency-modulated transmitter pulses. Echo signals are received by...
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