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5594450 |
Radar system and method for detecting targets clutter using target intensity and angular position
A radar system includes a radar receiver that provides the amplitude and the angular position of a plurality of return signals. A computer forms a test function of amplitudes and angular positions...
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5563604 |
Weather radar using spectral gaussian envelope discrimination for clutter rejection
A method for removing clutter related frequency components from power spectrums generated from weather radar return signals to provide improved windshear detection capability. Weather radar return...
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5563601 |
Two-port synthetic aperature radar system for radar detection of targets
Doppler signals from a two-port radar system are spectrally processed and searched for a pattern of points wherein clutter at a first instant of time is subsequently replaced by low-level returns...
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5546089 |
Optical monopulse chirp processor
An optical chirp processor for the collection and processing clutter samples is presented that allows the simultaneous estimation of both the clutter mean and variance. The estimated clutter mean...
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5510796 |
Apparatus for wind shear compensation in an MTI radar system
The invention relates to apparatus for reducing the masking effect in the doppler frequency domain of wind sheared clutter upon the radar returns of moving targets. The invention consists in...
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5500647 |
Method for determining the rank of distance ambiguity of radar echoes
Disclosed is a method for determining the rank of ambiguity in terms of distance of radar echoes. In a sequence comprising a given number N of recurrences, the method consists, in a first step, in...
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5499195 |
Fine-grained multi-planar clutter rejection processor
A fine grained multi-planar clutter rejection processor (10) for correlating multiple sets of data. The processor (10) maps each set of data onto a plurality of arrays (28-34). The data includes...
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5499030 |
Expert system constant false alarm rate (CFAR) processor
An artificial intelligence system improves radar signal processor performance by increasing target probability of detection and reducing probability of false alarms in a severe radar clutter...
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5497162 |
Radar signal selection based upon antenna bearing
A method for mitigating interference among a plurality of radar sets utilizes the steps of: determining the direction in which a radar antenna is pointing; selecting one of a plurality of different...
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5495253 |
Soliton rejection filter
A soliton rejection filter circuit is provided, for use in RF signal procing, for isolating a low level signal in the presence of stronger nearby interfering signals and detecting its modulation...
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5485157 |
Doppler radar detection system
The invention improves the radar detection capabilities for moving targets by censoring clutter and noise after it is outputted from a doppler processor. It effects the resulting clutter and noise...
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5481269 |
General frame wavelet classifier
A classifier employing general frame wavelets for improving target recognition while decreasing computational intensity is disclosed. A wavelet selection means compares a portion of a time...
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5473332 |
RFI suppression circuit and method
Improvement of radar sign-to-noise ratio and detection sensitivity in radar systems is achieved by methods employing the subtraction of the unwanted radio frequency interference, RFI, or "clone"...
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5469374 |
Automatic data segmentation module for target motion analysis applications
A system having a device for comparing incoming data with hypotheses prevsly formed from prior data for providing new hypotheses on target information. It has application when the data source is...
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5469171 |
HF background noise measurement in HF environments
A frequency surveillance method for monitoring background atmospheric noise evels in unoccupied channels in an operating frequency band of a high frequency communication system. In the method, the...
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5467091 |
Radar and other communication systems having large bandwidth and large dynamic range
A large bandwidth communication system has a transmitter to transmit signals over a selectable frequency operating range and a receiver having a first mixer for mixing an LO1 signal with received...
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5465095 |
Time efficient method for processing adaptive target detection thresholds in doppler radar systems
A time efficient method for processing digitized doppler radar signals and establishing adaptive target detection thresholds which are used to distinguish targets from noise and clutter. After...
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5451961 |
Time varying adaptive clutter filter and clutter residue sensor
Clutter reduction is accomplished by dividing the sampling times of received radar signals into blocks containing a plurality of sampling times. The average clutter value in each block is estimated...
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5434573 |
Three term ripple suppression
Three term ripple suppression apparatus for suppressing ripple in a radar image derived from received radar signals. The ripple suppression apparatus comprises a field programable gate array having...
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5432517 |
Method and device for the filtering of responses in a secondary radar extractor
A method for the defruiting of the responses from radar transponders received by a secondary radar in response to interrogations sent by the radar recurrently, a recurrence being formed by the...
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5424674 |
Wide dynamic range detection circuit
Two wide dynamic range detection circuits are disclosed, which are capable of detecting low-level desired signals in the presence of nearby strong interfering signals. Each circuit includes an...
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5424743 |
2-D weighted least-squares phase unwrapping
Weighted values of interferometric signals are unwrapped by determining the least squares solution of phase unwrapping for unweighted values of the interferometric signals; and then determining the...
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5418536 |
Bandwidth and amplitude insensitive frequency discriminator
A frequency discriminator which generates an output signal characteristically representative of a predetermined frequency spectrum of an input signal, but insensitive to variations in the amplitude...
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5418534 |
Method of compensating for a signal component generated by a moving radar antenna
The present invention relates to a method and apparatus for producing compensated baseband signal components for a moving radar antenna. A fixed frequency oscillator is used and a baseband signal...
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5416488 |
Radar return signal processing method
A radar system (10) forms a range-Doppler map (28). A CFAR processor (57) determines a threshold (60) and evaluates the map (28) to identify potential targets whose amplitudes are greater than the...
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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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5392047 |
Radar device comprising a synthetic aperture on the basis of rotating antennas
In the case of a ROSAR-device, a comparator module in which imaging defects are determined is provided for increasing and estimating the resolution precision in the processor circuit. This...
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5390133 |
Image processor for target detection and tracking
An image processor for use in detecting and tracking a plurality of targets is provided including a plurality of memory locations for storing intensity images and a signal processor coupled to the...
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5379043 |
Reply-frequency interference/jamming detector
Received IFF reply-frequency signals are examined to determine whether they re being interfered with by enemy sources, and indication of the extent of detected interference is provided. The number...
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5373297 |
Microwave repeater with broadband active and/or passive isolation control
A microwave repeater with antenna isolation comprises a first receiving anna for receiving an input signal from a distant source; an amplifier section for amplifying and modulating the input signal...
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5351055 |
Radar apparatus
A radar apparatus displays echo signals in a manner that desired echo signals can be easily distinguished from unwanted echo signals such as sea clutter and the like and eliminated, when any one of...
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5345242 |
Clutter rejection using connectivity
In a FLIR target detection system, true targets (52) are isolated from potential false target indications produced by background clutter through the use of a connectivity algorithm which attempts...
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5337055 |
Method and equipment for adjusting a radar detection threshold
This invention makes use of the technique known as CFAR (Constant False Alarm Rate). Its objective is to create a method of adjusting the detection threshold of a radar consisting in: breaking...
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5327141 |
Clutter removal by polynomial compensation
Apparatus and method for removing unwanted components of a signal received from a radar transmitter. The unwanted components lie in a clutter Doppler frequency band. Such components are removed by...
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5323161 |
Method of assessing radar target pulses
A method of assessing radar pulses in a passive, i.e. receive-only, radar system to distinguish pulses due to a particular target from pulses due to other targets from noise, interference, etc....
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5317320 |
Multiple radar interference suppressor
A multiple radar interference suppressor for use in a missile scoring system. The multiple radar interference suppressor phase locks the pulse repetition frequency of each drone (unmanned) aircraft...
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5311192 |
Polarization ECCM technique for radar systems
A process for cancelling the effects of noise jamming in a radar system having a dual-polarization monopulse antenna, a computer processor, and target detection algorithms, wherein the noise...
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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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5280288 |
Interference avoidance system for vehicular radar system
An interference avoidance system used in conjunction with a vehicular target detection system. The microwave transceiver section of the vehicular target detection system, in which the present...
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5264855 |
Technique for stationary radar target discrimination
The disclosure describes a method of measuring stationary CW radar targets in the presence of sizable clutter and leakage signals, and to eliminate the clutter and leakage by taking a first...
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5257028 |
Method of extracting phase errors caused by the atmosphere in the backscatter signal of a coherent imaging radar system carried by a carrier from radar raw data and apparatus for carrying out the method
In a method of extracting phase errors caused by the atmosphere in the backscatter signal of an on-board coherent imaging radar system from radar raw data, firstly to image areas with different...
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5235339 |
Radar target discrimination systems using artificial neural network topology
A system for distinguishing between a target and clutter analyzes frequency components of returned wave energy by one or more networks each having inputs receiving successive samples of the...
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5220329 |
Monopulse reply extractor for SSR navigation systems
An SSR reply decoding system for separating pulse codes of a series of closely-spaced or overlapping SSR replies is disclosed. A delay line is connected to receive pulses representing the leading...
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5212490 |
Echo ranging system for detecting velocity and range of targets using composite doppler invariant-like transmissions with suppression of false targets
False target (reverberation, clutter, etc.) detection is suppressed in an echo ranging system (sonar or radar) in which target velocity and range are measured using a composite Doppler...
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5179542 |
Signal processor
A signal processor which operates on an incoming signal to separate the signal into locally compact wavelets in the time frequency domain is described. The processor includes means for separating...
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5177487 |
Sea velocity evaluator
Sea clutter can be removed from radar signals by accurately determining sea velocity in a coverage area of a radar scan, updating a median value for the coverage area, and selecting a clutter...
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5173703 |
All weather strike system (AWTSS) and method of operation
An AWTSS is shown to be made up of an improved synthetic aperture radar (SAR) for generating radar maps with various degrees of resolution required for navigation of an aircraft and detection of...
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5162805 |
Frequency diversity sidelobe canceller
A new system and technique for cancelling interference in frequency agile ceiving systems. Main and auxiliary signals are supplied to a pair of multiple loop side-lobe cancellers which are capable...
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5134410 |
Sensitivity velocity control
A sensitivity velocity control program in a surveillance radar for distinguishing wanted moving targets from unwanted moving targets by processing radar target return data and having prestored...
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5132691 |
Method and apparatus for recognizing useful signals when superimposed with noise signals
In order to distinguish useful electrical signals from noise signals which are superimposed on the useful signals, a time window is moved along the receiver signal by means of a shift register. If...
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