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| Number | Title | Issue Date |
| 7298316 | Apparatus and method for instantly automatic detecting clutter blocks and interference source and for dynamically establishing clutter map An apparatus for detecting clutter blocks and an interference source for dynamically establishing a clutter map includes a clutter block detecting module accumulates a plurality of range cell data of each detecting area, and compares the accumulated value with a clu... | 11/20/2007 |
| 7224716 | Communication methods and apparatus employing spread spectrum techniques and doppler-tolerant polyphase codes A communication apparatus and method that includes generating a series of successive spread-spectrum signals formed through the concatenation of a direct sequence spread spectrum code with a Doppler Tolerant Polyphase Code (DTPC) is herein disclosed. By transmitting... | 05/29/2007 |
| 7053819 | Pulse wave radar device To achieve a purpose of the present invention, a pulse wave radar device related to the present invention modulates a first transmitting pulse and a second transmitting pulse which are separated from each other by a predetermined lapse of time and transmits a transm... | 05/30/2006 |
| 7046188 | System and method for tracking beam-aspect targets with combined Kalman and particle filters Systems and methods of tracking a beam-aspect target are provided. In embodiments, a target is tracked with a Kalman filter while detections are received. After a detection is missed, the Kalman filter may be concurrently propagated with a blind-zone particle filter... | 05/16/2006 |
| 6999025 | Clutter rejection in a passive radar receiver of OFDM signals with antenna array The invention concerns a passive radar receiver with an array of antennas for a OFDM received signal comprising frames of symbols each emitted on coded orthogonal carriers. After formatting received signals into digital symbols, dummy signals from dummy OFDM emitter... | 02/14/2006 |
| 6982668 | Tangential velocity measurement using interferometric MTI radar Radar systems use time delay measurements between a transmitted signal and its echo to calculate range to a target. Ranges that change with time cause a Doppler offset in phase and frequency of the echo. Consequently, the closing velocity between target and radar ca... | 01/03/2006 |
| 6975264 | Signal separating system A signal separating system 1 comprises a frequency conversion element 3, a dynamic filter component 4 with associated coherent stop slot and non-coherent passband, optionally a signal wave enhancer 7 with bypass, and a frequency reconvers... | 12/13/2005 |
| 6956522 | Pulse radar system A pulse radar system has a high-frequency source, which supplies a continuous high-frequency signal and is connected on the one side to a transmission-side pulse modulator and on the other side to at least one mixer in at least one receive path. A pulse modulator is... | 10/18/2005 |
| 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 invention solves the above-mentioned drawbacks, in particular solv... | 10/12/2004 |
| 6401036 | Heading and position error-correction method and apparatus for vehicle navigation systems The present invention provides methods and devices that enable correction of gyroscope bias and gyroscope bias drift in low-cost, vehicular navigation and positioning systems without using estimates of position and heading, and subsequent correction of he... | 06/04/2002 |
| 6020842 | Electronic support measures (ESM) duty dithering scheme for improved probability of intercept at low ESM utilization A duty dithering method for use with electronic support measures and radar warning receivers, and the like, that provides for improved probability of intercept at low utilization levels. The electronic support measures (ESM) system and radar warning recei... | 02/01/2000 |
| 5977905 | Target detection method and device for wideband unambiguous pulse Doppler radar Coherent bursts of N wideband, low repetition frequency width-modulated pulses are transmitted, and they are received with pulse compression and then sampling. For each range gate and each speed hypothesis, a selection is made of the corresponding samples... | 11/02/1999 |
| 5870054 | Moving target indicator with no blind speeds A moving target indicating system wherein a pulse source which generates radiofrequency drive pulses at a predetermined pulse repetition frequency is connected to the inputs of a pair of channels. The first channel includes a phase-dispersive filter havin... | 02/09/1999 |
| 5703593 | Adaptive DPCA subsystem An ADPCA subsystem includes a weight processor for weighting the delta channel signal according to the results of an adaptive algorithm to which the output of a DPCA vector combiner is input. An AMTI vector combiner is connected to the output of the DPCA ... | 12/30/1997 |
| 5539408 | Method for the detection, localization and velocity determination of moving targets from raw radar data from a coherent, single- or multi-channel image system carried along in a vehicle In a method for the detection, localization and velocity determination of moving targets from raw radar data from a coherent, single- or multi-channel image system (SAR), for representing the surface of the earth with different backscatter ratios, chronol... | 07/23/1996 |
| 5422646 | High frequency MTI radar An MTI radar based on a comparison of the Doppler shifts of the original signal and a phase-reversed signal using pulse compression wherein the received signal is phase detected for in-phase and quadrature components relative to the IF. A Doppler-correcte... | 06/06/1995 |
| 5109231 | Radar arrangement A radar system comprises a transmitter which essentially continuously transmits a modulated carrier wave signal and a receiver for receiving the carrier wave signal reflected at an object (echo signal). The carrier wave signal is modulated with a code-gen... | 04/28/1992 |
| 4972194 | Method and device for compensating for the speed of clutter in a coherent doppler radar with variable blind speed In a doppler radar, in order to compensate for the speed of moving clutter, one first establishes during a burst of order (i) the phase variation $c;ri from one period to the next and which is due to clutter in a given range cell. Then, this... | 11/20/1990 |
| 4924231 | Device for removing the ambiguity over range and speed, used more especially in combination with a doppler type radar receiver and a radar containing it A device for removing ambiguities in the range and speed at the output of a Doppler-type radar in which all possible sets (p1, q1) and (p2, q2) corresponding to echoes at different repetition frequencies are sto... | 05/08/1990 |
| 4890113 | Second time around clutter cancellation system The present invention provides a system that cancels second time around clutter in a multiple pulse repetition frequency radar system which uses three groups of differently spaced pulses. The system processes returns from a clutter cancellation group of e... | 12/26/1989 |
| 4809002 | Moving target indicator A moving target indicator device comprising a first clutter removing circuit for responding to a radar having a variable transmit repetition time and for removing clutter having a Doppler speed of nearly zero from a radar received signal having stationary... | 02/28/1989 |
| 4714927 | Pulse doppler radar with variable pulse repetition rate A pulse doppler radar having variable repetition rates, noise pulses resulting from echos received from stationary multiple-time-around objects are removed by subjecting the reflected pulses to a coherent integration modified by means of a simplified vect... | 12/22/1987 |
| 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 approximately 80 knots while having no high velocity blind spe... | 03/22/1983 |
| 4249178 | Apparatus for eliminating blind velocities in MTI radars A system and method for reducing the blind velocity problems in MTI coherent pulsed Doppler radar systems comprising an agile local oscillator which is preprogrammed to operate sequentially at more than one frequency unitl a target of interest is acquired... | 02/03/1981 |
| 4153899 | MTI radar system and method An MTI radar system having a four pulse canceller where the interpulse periods vary preferably according to a double or triple sawtooth pattern is disclosed. The four pulse canceller is comprised of a two pulse canceller cascaded with a three pulse cancel... | 05/08/1979 |
| 4057800 | Multi-PRF signal processor system A multi PRF doppler radar processor system for airborne target search radar preferably using five PRF's. The received signal is processed through a bank of doppler filters, and the filter number and PRF of every target indication in a single range band is... | 11/08/1977 |
| 3952302 | Synchronous detector with pulse repetition frequency modulation A moving target indicating radar that includes a coherent on receive system and a clutter referenced velocity compensator operating in association with a linear predictor to produce coherent IF (intermediate frequency) receive signals shifted in frequency... | 04/20/1976 |
| 3950749 | Doppler frequency impulse radar system with displaced pulse sequence 1. A doppler frequency impulse radar system, comprising a transmitting circuit for transmitting an impulse modulated carrier wave and a receiving circuit for receiving reflected echo impulses, said transmitting circuit including means for transmitting a f... | 04/13/1976 |
