Matches 401 - 450 out of 501 < 1 2 3 4 5 6 7 8 9 10 11 >
Match Document Document Title
4706092 Arrangement for measuring velocity with respect to a surface  
This arrangement comprises a fixed frequency emitter circuit (10) for directing a wave (12) to a surface (2) by means of a transmission antenna (11), a receiver circuit (25) for receiving by means...
4680589 Adaptive fast Fourier transform weighting technique to increase small target sensitivity  
A radar signal processor which operates without clutter canceller and AGC circuits by applying an adaptive weighting circuit which adjusts the FFT weighting function on a range gate basis to...
4679050 Pulse radar apparatus  
Described is a pulse radar apparatus having a repetition period containing m wobbles. The pulse radar apparatus is provided with: a transmitting and receiving unit (2), whereby the received target...
4670753 Method and apparatus for minimum amplitude time history analysis  
A method and apparatus selects the minimum value of a sequence of power measurements taken from each range of a radar's target area. This is preferably performed for two channels of a radar, and...
4654667 Signal-acquisition system for a circular array  
A signal-acquisition system (10) for a circular antenna array (12) includes a two-dimensional compressive receiver (18) that performs a two-dimensional Fourier transformation in time and position...
4652881 Efficient adaptive filter bank  
An N-point Fourier transform circuit for a moving target indicator system including a delay circuit with 2N-2 delays, N frequency filters, a processor for forming a main signal and N-1 auxiliary...
4646099 Three-dimensional fourier-transform device  
Signals from antenna elements (14) of a rectangular array (12) are translated in frequency by mixers (16) fed from a chirped local oscillator (19). The resultant signals are fed to the first of two...
4644356 Bistatic coherent radar receiving system  
A coherent-on-receive MTI radar receiver system for use with cooperative or non-cooperative radar transmitters of either the coherent or noncoherent, simple magnatron type and scanning antennas....
4641143 Two-dimensional acquisition system using circular array  
A frequency-and-direction-finding system (10) employing a circular array (12) performs a two-dimensional Fourier transformation in space and time on the signals from the individual elements. The...
4633257 Acquisition system employing circular array  
A system for indicating the direction of a source of radio waves received by a circular antenna array (12) includes a Butler matrix (18) that receives the array outputs and feeds the resultant...
4626854 Method and apparatus for generating a modified P.sub.1 code  
A digital pulse expander-compressor for use in pulse compression radars and having the advantage of precompression bandwidth tolerance. The pulse expander-compressor employs a discrete Fourier...
4622556 Technique for rapid determination of probability of detection in pulse doppler radars  
A technique and apparatus are disclosed for determining the performance of a pulse doppler radar system every integration period. The test is accomplished by injecting into the front end of the...
4622552 Factored matched filter/FFT radar Doppler processor  
A factored matched filter/FFT radar Doppler processor for reducing the le of clutter components contained in radar signals. The processor includes a matched Doppler filter, having a filter response...
4620192 Continuous wave radar with ranging capability  
A frequency modulated continuous wave radar wherein analog signals received from a target are converted to digital form, processed by correlation with differently delayed signals, also in digital...
4617567 Automatic motion compensation for residual motion in a synthetic aperture radar system  
In a SAR system (10) a method is provided for compensating for antenna AN residual motion relative to a motion sensor INS, wherein such residual motion causes phase corruption in a radar image...
4616227 Method of reconstructing synthetic aperture radar image  
Azimuth compression processing is carried out by the steps of determining Doppler rate time change data a reconstructed scene from orbit data of a sattelite or aircraft, determining azimuth...
4612545 Automatic frequency identifier for radar signals  
The invention provides a means for determining rapidly and accurately frequency information of electromagnetic radiation. It combines the operation of an Instantaneous Frequency Measurement...
H000108 Radar doppler processor using a fast orthogonalization network  
A radar doppler processor, comprising M, M=N-1, tap delay lines; N digital multipliers; a N-point fast fourier transform network; and a fast orthogonalizing network to orthogonalize each subband...
4591857 Programmable LFM signal processor  
The linear frequency modulation (LFM) signal processor may be programmed to be a matched filter for any pulse compression (PC) ratio less than or equal to the square of the number of bandpass...
4586044 Clutter positioning for electronically agile multi-beam radars  
An electronically agile multi-beam radar including a clutter positioning system for positioning the band of clutter signals in the derived doppler frequency spectrum of each of the individual beams...
4578677 Range doppler coupling magnifier  
A pulse expander-compressor for magnifying the range-doppler-coupling effs that accompany the use of frequency-modulation derived phase coded pulse compressors in order to accentuate the...
4568938 Radar altimeter nearest return tracking  
An FMCW distance measuring device is disclosed which enables increased accuracy by detecting the nearest return. A portion of the transmitted wave in an FMCW altimeter is mixed with the received...
4566011 Palindromic polyphase code expander-compressor  
A digital pulse expander-compressor for generating polyphase coded pulses which are highly doppler tolerant and have autocorrelation functions which are identical under frequency sweep reversal....
4563686 Range/doppler ship imaging for ordnance control  
Distortions inherent in the formation of a range/doppler image by an airborne Synthetic Aperture Radar (SAR) of a ship under the influence of roll, pitch, and yaw motions characteristic of sea...
H000014 Adaptive doppler filter banks  
A radar system for cancelling radar clutter with a minimum of equipment comprising an N-point Fast Fourier Transform for dividing the radar's doppler space into N contiguous frequency subbands; a...
4562439 Imaging radar seeker  
An imaging radar seeker (8) for producing two-dimensional images of a target (2) is mounted on a missile (6) or other moving body, such as an automobile. A computer (40) directs the seeker (8) to...
4546355 Range/azimuth/elevation ship imaging for ordnance control  
Capability is provided for producing 3 scaled high resolution orthogonal image projections on a CRT of a ship under the influence of translational as well as rotational motions arising from sea...
4536764 Method of counting multiple targets in the post detection processing of a radar  
A method of analyzing the doppler spectrum obtained from narrow band doppler filtering in the post-detection processing of a radar for the purposes of counting multiple targets moving in close...
4527161 3D Imaging with stepped frequency waveforms and monopulse processing  
A radar is disclosed that obtains three-dimensional radar images of targets for target identification at tactically useful ranges. Images are generated with the radar in a target angle and range...
4527159 Threshold circuit for radar video data  
A threshold circuit comprises a shift memory (1) supplied with sampled and digitized radar video data; two adder circuits (2, 3) connected to the first and the last elements of the shift memory...
4524362 Phase coded pulse expander-compressor  
A pulse expansion and compression system, especially useful for radar rang, comprising a pulse coder for expanding an input pulse and a pulse compressor of the matched-filter type. The coder...
4524363 P2 Polyphase code expander-compressor  
A pulse expansion and compression system, especially useful for radar rang, comprising a pulse coder for expanding an input pulse and a pulse compressor of the matched-filter type. The coder...
4513289 P1 Polyphase code expander-compressor  
A pulse expansion and compression system, especially useful for radar rang, comprising a pulse coder for expanding an input pulse and a pulse compressor of the matched-filter type. The coder...
4490718 Radar apparatus for detecting and/or classifying an agitated reflective target  
Improved non-cooperative radar apparatus locates and type-classifies an agitated, vibrating reflective target (e.g., a vehicle with its engine running)--whether the target is moving or stationary....
4471357 Pipelined digital SAR azimuth correlator using hybrid FFT/transversal filter  
A synthetic aperture radar system (SAR) having a range correlator (10) is provided with a hybrid azimuth correlator (12) for correlation utilizing a block-pipelined Fast Fourier Transform (12a)...
4462032 Radar signal processing process and circuit  
Process for real time signal processing for side-looking synthetic aperture radar systems, the signal consisting of sample sequences corresponding to given spacing gates. For each spacing gate an...
4450444 Stepped frequency radar target imaging  
An apparatus is disclosed by which radar targets can be imaged in two dimions for identification at full radar range using relatively moderate speed data processing. Images of targets are found in...
4443792 Electromagnetic position detector employing fast fourier transform analysis  
A high frequency signal is beamed into a bunker and a reflected signal from the top of the contents in the bunker is detected and fed into electronic circuitry. This circuitry obtains a beat signal...
4403314 Active detection system using simultaneous multiple transmissions  
A system for detection by an echo containing transmission and reception sources for detection by acoustic waves in particular. A circular base with N columns T 1 , T 2 , -T i ,-T N of...
4389092 High speed ambiguity function evaluation by optical processing utilizing a space variant linear phase shifter  
A system for using optical data processing means to create the ambiguity function for two signals is disclosed. One-dimensional spatial light modulators are employed to code the signals into a beam...
4384291 Efficient low-sidelobe pulse compression  
A pulse compression system for use with step approximation to linear FM and rank coded signals to eliminate sampling errors and range time grating lobes while providing large pulse compression...
4379295 Low sidelobe pulse compressor  
A pulse compression system based on the transmission of a step approximat to linear FM pulse, and the subsequent processing of echos therefrom by converting the echo pulses to I and Q baseband...
4377811 Medium PRF pulse doppler radar having simplified ground moving target rejection capabilities  
In a single channel medium PRF pulse doppler radar receiver, the return signal data is processed to prevent sidelobe return signals from being displayed and rejects ground moving targets up to...
4373190 Efficient, precompression, bandwidth-tolerant, digital pulse expander-compressor  
A digital pulse expander-compressor for use in pulse compression radars and having the advantage of precompression bandwidth tolerance. The pulse expander-compressor exploys a discrete Fourier...
4355311 Multibeam single frequency synthetic aperture radar processor for imaging separate range swaths  
A single-frequency multibeam synthetic aperture radar for large swath imaging is disclosed. Each beam illuminates a separate "footprint" (i.e., range and azimuth interval). The distinct azimuth...
4339752 Synthetic array processor  
A synthetic array processor wherein radar data, received from an area to be mapped during a plurality of subarray flight path segments, is electronically focused in parallel processing channels to...
4339176 Holographic space-variant system for evaluating the ambiguity integral  
An optical system for creating the ambiguity function of a moving target is disclosed. The two signals which are to be used in the analysis are coded on spatial data masks as two-dimensional arrays...
4297702 Polyphase coded fuzing system  
A radar fuzing system for a guided missile is shown to include means for impressing a polyphase coded modulation on a transmitted signal and delayed replicas of such modulation on a bank of...
4271413 Null mask  
A coherent optical processor antenna controller which is capable of inserg deep nulls in the antenna pattern at selected locations, without degrading the remainder of the pattern. The processor...
4271412 Range tracker utilizing spectral analysis  
A radar system transmits a signal to a target wherein the frequency is modulated with a sinusoidal modulation pattern. The difference between the actual target range and an estimate thereof is...
Matches 401 - 450 out of 501 < 1 2 3 4 5 6 7 8 9 10 11 >