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6044336 |
Method and apparatus for situationally adaptive processing in echo-location systems operating in non-Gaussian environments
A signal processing method for use in echo-location systems (radar, sonar, laser radar) to obtain accurate estimates of the target reflectivity sequence in a random (non-Gaussian) noise...
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6040797 |
Method for detecting a radar target
The invention relates to a method of detecting a radar target, especially a sea target, in the presence of clutter caused by ocean waves in particular. To detect a radar target within a...
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6038526 |
Method for detecting weak signals in a non-gaussian and non-stationary background
A method is described for detecting weak signals in a non-Gaussian and non-stationary background using a hidden Markov parameter estimator. The method comprises the steps of: a) partitioning input...
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6037892 |
Method for automatic focusing of radar or sonar imaging systems using high-order measurements
Automatic focusing of radar or sonar imaging systems, for example, synthetic aperture radar (SAR) or synthetic aperture sonar (SAS) systems, is accomplished by using high order measurements, such...
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6028549 |
Process for the detection and suppression of interfering signals in S.A.R. data and device for performing this process
For the detection and suppression of interfering signals in SAR data, a time-domain noisy raw data signal U T (t) is Fourier-transformed by range lines in raw frequency-domain spectrum U T (f)....
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6018310 |
Radar device with false-alarm control on scatter
The invention relates to a radar device comprising two antennae fed by the same emission means, but serving reception means which are separated at least in part into two channels, followed by...
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5995038 |
Wake filter for false alarm suppression and tracking
A processing technique suitable for use with a search radar system which minimizes the false detection of targets. Rather than rely on a predetermined target trajectory, such as a straight line...
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5990824 |
Ground based pulse radar system and method providing high clutter rejection and reliable moving target indication with extended range for airport traffic control and other applications
An MTI radar system transmits pulses with variable interpulse time periods and is structured with a lattice filter to process return signals to identify targets while substantially rejecting static...
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5973634 |
Method and apparatus for reducing range ambiguity in synthetic aperture radar
A modified Synthetic Aperture Radar (SAR) system with reduced sensitivity to range ambiguities, and which uses secondary receiver channels to detect the range ambiguous signals and subtract them...
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5955984 |
System and method for simultaneous data link with multipurpose radar operations
A technique for operating a communication link in RF proximity to an operational radar. A data link waveform is employed which allows a data link receiver to detect an alert indication during...
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5955985 |
Device for the reduction of noise in a radar receiver
Disclosed is a device for the reduction of noise in a radar receiver. The noise to be reduced being governed by a 1/F k relationship and the radar carrying out an encoding of the transmission in...
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5952955 |
Compensation for radar path length variation and phase error
Methods that compensate for phase errors caused by path length variations in a radar system, and that compensate for relative phase errors in upconvertor and downconverter references employed in...
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5949368 |
Adaptive constant false alarm rate circuit with extremely low loss
A false alarm rate is maintained at or below a desired rate over a fluctuating mean noise level for providing additional sensitivity and increased range performance in a constant false alarm rate...
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5940025 |
Noise cancellation method and apparatus
A radar transmitter for producing a radar signal in response to a radar trigger signal fed thereto. The transmitter includes a radio frequency oscillator for producing a signal having a radio...
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5920282 |
Digitally-controlled pulse shaper for pulsed radar systems and radar wind profilers
A digitally-controlled pulse shaper (DCPS) is provided which precisely controls the shape of the leading and trailing edges of a transmit pulse in a radar wind profiler, or pulsed-radar. In the...
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5909190 |
Clutter rejection using adaptive estimation of clutter probability density function
A processor and method for discriminating against interference during target acquisition and reacquisition processing of densely cluttered images. The processor and method that adaptively estimates...
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5900835 |
Coherent hidden markov model
A hidden Markov detector of the present invention comprises a hidden Markov arameter estimator for coupling to an input data source, a parameter smoother coupled to the parameter estimator, and a...
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5861837 |
Poly-frequency CW doppler radar system with leakage cancellation and method
A single antenna poly-frequency Continuous Wave (CW) Doppler radar system having leakage cancellation. The system provides for transmitting a plurality of carrier frequency signals and receiving...
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5842156 |
Multirate multiresolution target tracking
A multiresolution, multirate approach for detecting and following targets. The resolution of data obtained from a target scanning region is reduced spatially and temporally in order to provide to a...
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5808579 |
Radar system using a cell averaging constant false alarm rate device
A cell averaging (CA) constant false alarm rate (CFAR) device for use in a radar system which filters noise and clutter from a signal containing a plurality of range cells. A moving window average...
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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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5798728 |
Radar signal processing apparatus
The radar signal processing apparatus according to the present invention comprises a noise distribution measurement system comprising an edge detecting circuit, a noise distribution measuring...
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5793326 |
Methods of generating a clutter threshold and arrangements for executing the methods
A method and arrangement for generating a clutter threshold by means of a CFAR circuit. In the process the partial registers of the CFAR are subdivided into storage blocks each containing a...
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5786788 |
Radar system and method for reducing range sidelobes
A system (10) for reducing range sidelobes adapted for use with pulsed radar systems. The inventive system (10) includes a mismatched filter (90) for correlating a received signal (84) with a...
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5781144 |
Wide band video signal denoiser and method for denoising
A method and apparatus for high speed denoising of an input signal received by a radar warning receiver (RWR) system. The novel system digitizes the input signal into sample windows each having a...
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5781149 |
Doppler radar clutter spike rejector
The invention is an improved clutter suppressor for MTI and pulse doppler radars operating so that the received clutter pulses are large enough to hard limit within the receiving system. It is...
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5760733 |
Apparatus for avoiding crosstalk problems when locating a vehicle travelling along means for propagating electromagnetic waves
An apparatus for avoiding crosstalk problems when locating a vehicle travelling along an electromagnetic wave propagation path. The apparatus is particularly directed to rail transport. The...
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5760734 |
Radar clutter removal by matrix processing
An apparatus and method for radar detection of spectral moments and other spectral characteristics of echoes includes an agile antenna which directs an antenna beam in a direction for a dwell...
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5757312 |
Method and apparatus for hard-wired adaptive cancellation
Hard-wired analog adaptive cancellation for microwave receivers to cancel the interference generated by co-located transmitter employs a circuit having two or more quadrature taps on a delay line....
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5748142 |
Pulse doppler radar system which identifies and removes electromagnetic interference
A radar system for identifying an object of interest. A transmitter produces a first signal and a duplexer receives the first signal from the transmitter. An antenna transmits the first signal into...
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5734577 |
Adaptive IIR multitone detector
An adaptive Infinite Impulse Response (IIR) filter is provided that can adaptively detect the presence of one or more tones in its input stream. The tones to be detected may be of arbitrary...
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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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5706013 |
Nonhomogeneity detection method and apparatus for improved adaptive signal processing
Apparatus and method for improving detection of targets in a radar system that employs adaptive filtering. A nonhomogeneity detector eliminates nonhomogeneous signals from the population of signals...
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5703592 |
Method and apparatus for estimating the detection range of a radar
A method and apparatus estimate the detection range R 1 of a radar in the presence of noise and clutter. The radar return signals from a range cell under test and from a plurality of surrounding...
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5694342 |
Method for detecting signals in non-Gaussian background clutter
The invention provides a method for detecting signals in non-Gaussian background clutter, comprising the steps of: 1) filtering input data to partition Gaussian input data from non-Gaussian input...
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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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5686919 |
Process for generating wind profiler data free of fixed ground clutter contamination
This invention discloses a process for generating wind profiler data which is free of fixed ground clutter contamination. The fixed ground clutter contamination is removed based upon the different...
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5668739 |
System and method for tracking objects using a detection system
A system and method of tracking objects first receives returns from objects in the field of view of a detector. The sensor generates a current frame of datapoints, where an object in the field of...
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5661487 |
Digital center line filter
A center-line filter for a radar receiver is a cascade of an analog filter and a digital filter. The purpose of the filter cascade is to filter out all but a single line of a pulsed spectrum. The...
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5659319 |
Method and apparatus for operating a surface detection surveillance radar using frequency agile pulse transmissions
In accordance with the principles of the invention, a surveillance radar is provided with a rotating, frequency squinting, end-fed slotted array antenna, which is caused to transmit a plurality of...
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5644508 |
Detection of moving objects
Moving objects (36) are detected by processing images through a spatial filter (42) and positional shifter (46), which shifts the image by an amount reflecting a line of sight velocity hypothesis...
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5633643 |
Method and device for signal-processing in a radar system
Method and device for reducing, in a radar system, the influence of distortion which has arisen in signals in signal-generating and signal-processing parts of the radar system by firstly applying a...
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5630154 |
Programmable systolic array system arranged in a found arrangement for passing data through programmable number of cells in a time interleaved manner
A linear systolic array of computation cells, each cell having several vector rotation stages. These stages are programmable to provide efficient implementation of a variety of matrix algorithms....
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5617099 |
Adaptive filtering of matched-filter data
An adaptive processor which uses the successive range and Doppler outputs of a conventional matched-filter to improve the signal-to-noise ratio for non white noise/clutter. The adaptive processor...
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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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5608514 |
High range resolution ladar
In a high range resolution ladar, a chirp signal waveform is propagated as a divergent laser light waveform and the target reflected return is collected and converted to a current proportional to...
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5604503 |
Multipath and co-channel signal preprocessor
A multipath signal preprocessor which permits coherent bistatic radar detection with a single omnidirectional antenna is provided. The multipath signal preprocessor separates multipath signals...
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5602760 |
Image-based detection and tracking system and processing method employing clutter measurements and signal-to-clutter ratios
A method for measuring and quantifying clutter, and target detection and tracking systems that employs wavelet-based clutter quantification to generate a clutter number and a signal-to-clutter...
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5598355 |
Process for the trajectography of objects and device for performing this process
The invention relates to a process for obtaining trajectories of moving objects, by optimizing at least one criterion from the physics of the phenomenon observed and comprising the following...
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