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6844843 |
Signal processing apparatus of radio radar
A signal from CW radar is received, and the received power detected by the CW radar's swinging in all directions is averaged in each direction. Then, the maximum value and the minimum value of the...
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6839471 |
Extended discrete fourier transform and parametric image algorithms
Computation of the Extended Discrete Fourier Transform (XDFT) for N×N input data (corresponding to an N×N image) gives additional information about each point in the image. This additional...
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6828929 |
Technique for non-coherent integration of targets with ambiguous velocities
A method for processing pulsed-Doppler radar signals to detect a target includes transmitting radar signals from a radar system according to a predetermined frequency technique including signals...
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6803876 |
Irregular PRT deconvolution method and systems, and its uses
This invention relates to radar signal processing. In particular, this invention concerns Doppler processing and clutter filtering on irregular Pulse Repetition Time (PRT) sampled signal. This...
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6801155 |
Method and apparatus for recognising a radar target
A method of recognizing a radar target comprises producing a sequence of Doppler spectra of radar returns form a scene and producing therefrom a sequence of Doppler feature vectors for a target in...
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6798373 |
FM-CW radar system
An FM-CW radar system comprises a modulating signal generating means for changing a modulating signal to be applied to a FM-CW wave, a calculating means for calculating a distance or relative...
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6798374 |
Traffic surveillance radar using ranging for accurate target identification
Disclosed is a Doppler shifted radar apparatus for correct target identification with respect to surveillance of moving vehicles. More particularly, an improved radar detection system using two or...
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6795012 |
Radar for detecting a target based on a frequency component
In a radar, a coupler extracts a part of a transmission signal as a local signal and a mixer mixes a reception signal from a circulator and the local signal so as to output an intermediate...
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H002109 |
Passive microwave direction finding with monobit fourier transformation receiver and matrix coupled antenna
A passive instantaneous microwave signal frequency identifying and angle of arrival identifying system employing a beam steering multiple element antenna coupled through a Butler matrix to a...
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6781541 |
Estimation and correction of phase for focusing search mode SAR images formed by range migration algorithm
A method for acquiring synthetic aperture images of stationary targets converts a plurality of radar signals stored as digital values and motion compensated to a first order into a well focused...
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6778127 |
Drillstring radar
A drillstring radar comprises a measurements-while-drilling instrument for mounting just behind the drill bit and downhole motor of a drill rod. The instrument includes a radar system connected to...
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6778129 |
Crossover detection method, radar apparatus and crossover detection program
The crossover detection method of a radar apparatus according to the present invention calculates distance/relative velocity information at a multitude of different clock times, using a beat...
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6765522 |
Automatic recognition of radar scan type
A system for determining the scan type of a signal, such as a radar signal, includes a scan detector, a transformer (e.g., an FFT algorithm), a correlator, and a decision block. The signal is...
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6753805 |
Radar system
In an FM-CW radar system, regarding peaks appearing in the frequency spectrum of a beat signal in an FM-CW radar, groups of consecutive peaks in beam bearings within a predetermined frequency...
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6750804 |
System and method for detecting and estimating the direction of near-stationary targets in monostatic clutter using phase information
A system and method for detecting a target. The inventive method includes the steps of receiving a complex return signal of an electromagnetic pulse having a real and an imaginary component;...
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6744400 |
System and method for evaluating uniformity of a wave field in a radar cross section test range
A method and system for probing incident radar fields in a target test zone of a radar cross-section (RCS) test facility is provided. The present invention accomplishes probing by exploiting the...
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6741204 |
Signal process apparatus for an on-vehicle radar and method thereof
The invention provides a signal process apparatus for an on-vehicle radar and a method thereof that can reduce operation load and obtain a sufficient detection capability. According to information...
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6735346 |
HD fourier transforms for irregularly sampled data
A collected data is divided into M single valued subsets, where M is greater than zero. A two-dimensional subset image is formed from each single valued subset. Then, a fast Fourier transform is...
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6731235 |
Mispairing determination and signal processing method for FM-CW radar
When a new target is detected, if it is determined that the distance difference between the newly detected target and the previously detected target is within a predetermined range, the difference...
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6731233 |
Method of suppressing jammer signals
In a method of suppressing jammer signals in the received signal of radar antennas of HPRF applications (such as pulse Doppler radar systems) by means of Fast Fourier Transformation and side lobe...
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6714153 |
Device for electromagnetic detection of geological properties in a well
The invention is a well radar for detecting, by electromagnetic wave reflection, resistivity horizons in production zones in oil wells. Transmitter and receiver antennas are combined in a tubing...
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6707419 |
Radar transmitter circuitry and techniques
A radar transmitter includes a digital ramp generator circuit for generating a VCO control signal. The ramp generator includes a digital signal processor and a digital-to-analog converter. In one...
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6704438 |
Apparatus and method for improving the signal to noise ratio on ultrasound images using coded waveforms
A parallel, frequency domain filter ( 50 ) for providing frequency-dependent phase delay for real data includes a fast Fourier transform (FFT) device ( 52 ), a complex multiplier ( 54 ), a filter...
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6703966 |
Method and device for measuring the speed of a moving object
To measure the absolute speed of a body 100 moving relative to the ground 33 using an onboard speed sensor 1 , a radar wave is transmitted towards the ground by an antenna with a wide aperture...
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6690316 |
System and method for automated alerting to geospatial anomalies
An automated inexpensive system and reliable method for detecting spatial anomalies in real time, allows an unsophisticated operator to detect hidden anomalies efficiently and safely. In a...
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6690315 |
Quadbit kernel function algorithm and receiver
A Fourier transformation system usable for example in an electronic warfare radio receiver for analyzing spectral content of multiple transmitter-sourced brief duration incoming signals for...
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6686870 |
Radar
A radar device precisely detects a target in short time intervals by detecting a true peak frequency with high accuracy via a calculation which does not require a large amount of computation. A...
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6674393 |
FM-CW radar processing device
An FM-CW radar processing system pairs up peaks obtained by fast-Fourier transforming a beat signal occurring on an up portion and a down portion of a triangular-shaped FM-CW wave, calculates a...
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6670907 |
Efficient phase correction scheme for range migration algorithm
A system and method for efficient phase error correction in range migration algorithm (RMA) for synthetic aperture radar (SAR) systems implemented by making proper shifts for each position...
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6664920 |
Near-range microwave detection for frequency-modulation continuous-wave and stepped frequency radar systems
A cancellation technique embodied in a system and a radar signal processing method that is employed to detect near-range targets. The present invention uses a frequency-modulation continuous-wave...
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6650272 |
Radar system and method
A method for exciting an antenna with a waveform having a burst width and pulse width scaled proportionately with a selected range scale and a temporal filter to address any ambiguities in range...
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6650276 |
Radar apparatus and method for detecting small slow moving targets
Radar method and apparatus for detecting small, slow moving targets in the presence of high background clutter that includes a balanced bridge structure to achieve a null balance with the target...
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6646591 |
Doppler complex FFT police radar with direction sensing capability
A series of police doppler single mode radars and a multimode police doppler radar, all with direction sensing capability are disclosed. A quadrature front end which mixes received RF with a local...
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6646589 |
Radar designed to minimize error in detecting target
An FMCW radar is provided which may be employed in automotive anti-collision or radar cruise control systems. In a distance measuring mode, only one of channels is used to sample a beat signal...
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6633252 |
Radar plow drillstring steering
A radar-plow drillstring steering system comprises a steering plow and a measurements-while-drilling instrument for mounting just behind the drill bit and downhole motor of a drill rod. The...
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6630900 |
Process for carrying out a non-contact remote interrogation
The invention relates to a system suitable for a remote interrogation of passive transponders using chirp signals for interrogation. The transponder preferably has an encoding unit ( 11 ), a...
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6611225 |
Radar signal processing apparatus, and method of measuring distance and speed
A radar signal processing apparatus has a range gate for extracting range gate data sequences from a memory, a first frequency extraction section which extracts a beat frequency corresponding to a...
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6608586 |
Method for removing RFI from SAR images
A method of removing RFI from a SAR by comparing two SAR images on a pixel by pixel basis and selecting the pixel with the lower magnitude to form a composite image. One SAR image is the...
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6603423 |
Method for detecting wires using the ROSAR system
A ROSAR wire detection method is based upon ROSAR focusing of entire segments of wire. By generating a wire reference signal comprised of a sum of coherent reference signals, the basis for reliable...
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6593874 |
Radar for detecting the distance to a target
In a radar, a frequency-modulated transmission signal whose frequency varies in time is generated. The gain-frequency characteristics of an IF signal which represents a beat signal between the...
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6590519 |
Method and system for identification of subterranean objects
A radar source is configured on a vehicle, which may be an airborne vehicle such as a helicopter. An arrangement of at least one computer system is provided in communication with the radar source...
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6587073 |
Frequency-signal processing method
A method for the processing of a frequency signal especially for utilization in the evaluation of a distance measurement by means of pulsed electromagnetic waves or of frequency-modulated...
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6583754 |
Fast fourier transform signal processing method for doppler radar speed sensor
A vehicle speed sensing system includes an RF transceiver coupled to an antenna for transmitting an RF signal towards the terrain over which the vehicle moves and for receiving a reflected Doppler...
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6577265 |
Multi-stage processing for efficient and accurate spectral moment estimation
A multi-stage processing system receives data from signals that indicate information related to scatterers, such as signals from a Doppler scanning system. The multi-stage processing system tracks...
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6577267 |
Device and method for contactlessly measuring speed on surfaces
A device for non-contractual measurement of the speed of an object moving over a surface comprises a means for radiating a signal of fixed frequency at an angle onto the surface in or against the...
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6570526 |
Speedometer
A device for measuring the speed reached and the distance covered by a moving user or object has a Doppler radar sensor that may be secured to the moving user or object and is made of a microwave...
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6538599 |
Noncoherent gain enhancement technique for non-stationary targets
A radar system and radar processing method includes a number of aspects for providing improved function. The system and method may employ one or more of the following aspects: timely range-velocity...
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6531976 |
Adaptive digital beamforming radar technique for creating high resolution range profile for target in motion in the presence of jamming
A wideband adaptive digital beamforming technique for maintaining a high range resolution profile of a target in motion in the presence of jamming utilizes a sequence of adaptively calculated...
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6529157 |
Radar signature evaluation apparatus
An improved radar signature evaluation apparatus for measuring and evaluating the radar signature for an aircraft, missiles, and other vehicle. The radar signature apparatus includes an...
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6522284 |
Radar cross-section measurement system for analysis of electrically insulative structures
A method and system for identifying an anomaly in an electrically insulative component of a structure, such as an insulator on a utility or telecommunications pole, are provided. Locations for the...
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