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| Number | Title | Issue Date |
| 7671789 | Method and system for target detection and angle estimation based on a radar signal A method for target detection and angle estimation in a radar system includes receiving a signal from a radar array; based on the received signal, performing monopulse beamforming to obtain one or more monopulse beams; based on the monopulse beams, determining monop... | 03/02/2010 |
| 7417584 | Monopulse radar estimation of target altitude at low angles of elevation A monopulse radar operating at low angles of elevation (LOE) receives returns from a target by a direct path and by a path including a reflection from that portion of the Earth's surface lying between the radar and the target. The surface-reflected signal tends to c... | 08/26/2008 |
| 7372897 | Portable information communication terminal, program, and recording medium The number of times for averaging operation for averaging a correlation value of a received signal and a reference signal is properly controlled. When the correlation value is not averaged, since a lower limit value TH_A of a correlation level of a distribution of t... | 05/13/2008 |
| 7358848 | Wireless remote sensor An integrated circuit implements a wireless remote sensor. The wireless remote sensor includes an antenna coupled to an energy distribution unit to allow passive collection of electrical charge. A signal processing unit couples to the energy distribution unit and mo... | 04/15/2008 |
| 7352800 | Method of partial parallel interference cancellation A method of Partial Parallel Interference Cancellation (PPIC) is provided for recursively eliminating the Multiple Access Interference from a received signal. Such method is to use a recursion way to eliminate all the Multiple Access Interference (MAI) one by one fr... | 04/01/2008 |
| 7304602 | Axial deviation determining method for on-vehicle radar An on-vehicle radar and a method of determining an axial deviation of the radar using stationary objects free of erroneous determination are disclosed. The amount of axial deviation of the radar is determined from the calculated stationary object line based on the d... | 12/04/2007 |
| 7268724 | Reduced-error monopulse processor This monopulse processor provides target position information having an RMS error which is less than that of a conventional monopulse processor. A Σ±jΔ vs. Σ processor is modified to provide a position output signal equal to the smaller in absolute magnitude of ... | 09/11/2007 |
| 7242345 | Method for controlling a radar antenna A method is described for detecting an object with target radar. After the first detection of an object, the antenna is tilted. The original direction towards the object is restored by electronically steering the emitted beam. The beamsteering is obtained by changin... | 07/10/2007 |
| 7205932 | Method and apparatus for improved determination of range and angle of arrival utilizing a two tone CW radar An improved system is provided for aiming a shotgun-based or other countermeasure system so as to be able to countermeasure incoming rockets or projectiles. In one embodiment a shotgun aimed and controlled by the subject system projects a pattern of pellets to inter... | 04/17/2007 |
| 7161530 | System and method for radar calibration using antenna leakage The system and method for radar calibration using antenna leakage is a simplified means of calibrating the channels in amplitude and phase using natural signal leakage between antennas. It utilizes as calibration signal a wideband sinusoidal Frequency Modulated Cont... | 01/09/2007 |
| 7161529 | Dual forward scattering method for modeling multipath propagation Analysis of electromagnetic (or acoustic) multipath propagation inventively focuses upon the transmitter-to-target propagation (transmitted propagation reaching target via both direct pathway and forward scattered pathway) and the target-to-receiver propagation (re-... | 01/09/2007 |
| 7136014 | System and method for estimating the azimuth pointing angle of a moving monopulse antenna An invention is provided for determining the azimuth pointing angle of a moving monopulse antenna. Pulses of energy are broadcast at the surface of a planetary body. Reflected signals are received from the surface of the planetary body using a plurality of feeds. A ... | 11/14/2006 |
| 7026981 | Surface interaction region methodology for delimiting multipath propagation inquiry Analysis of electromagnetic (or acoustic) multipath propagation inventively confines the assessment of multipath propagation to a “surface interactive region” (“SIR”), intermediate the target and transmitter and/or the target and receiver. The down range tim... | 04/11/2006 |
| 6801156 | Frequency-agile monopulse technique for resolving closely spaced targets A monopulse radar system generates elevation and azimuth difference monopulse estimates of the location of targets in each range cell, where the target may be either a single or plural target, each of which is made up of multiple scattering sources. Each azimuth-ele... | 10/05/2004 |
| 6734820 | Methods and apparatus for conversion of radar return data An in-phase/quadrature component (IQ) mixer is configured to reject returns from a negative doppler shift swath in order to mitigate corruption of returns of a positive doppler shift swath. The mixer includes a sample delay element which produces a quadrature compon... | 05/11/2004 |
| 6720910 | Pri-staggered post-doppler adaptive monopulse processing for detection and location of a moving target in ground clutter A method, apparatus, and processing system for radar detection and tracking of a target using monopulse ratio processing comprising the following steps. First, receiving a signal comprised of a plurality of sum azimuth beams and difference azimuth beams. Then stagge... | 04/13/2004 |
| 6674390 | Shipboard point defense system and elements therefor A pulse Doppler radar receiver is disclosed wherein monopulse sum and difference signals are time-multiplexed and passed through a single gain-controlled amplifier channel for normalization, the sum signal being processed to provide both a D.C. gain contr... | 01/06/2004 |
| 6630902 | Shipboard point defense system and elements therefor A radar receiver is shown wherein the frequency of a first local oscillator is changed to bring an intermediate frequency signal representative of a moving target into frequency coincidence with a signal from a reference oscillator of fixed frequency.... | 10/07/2003 |
| 6404379 | Matrix monopulse ratio radar processor for two target azimuth and elevation angle determination A method and system for identifying the locations of plural targets lying within a main beam of a monopulse antenna including four ports for generating sum, elevation difference, azimuth difference and double difference signals. The method comprises the s... | 06/11/2002 |
| 6369746 | Simultaneous nulling in low sidelobe sum and difference antenna beam patterns A radar system includes a null processor coupled to transmit receive modules. The null processor inserts nulls in the sum pattern at locations for suppressing a jamming source. The null processor determines the difference pattern based upon the product: s... | 04/09/2002 |
| 6316934 | System for three dimensional positioning and tracking A system for monitoring of the position of at least one portion of an object. The system includes a plurality of transmitters operative to transmit alternating magnetic fields within a three-dimensional space, and at least one positioning sensor arranged ... | 11/13/2001 |
| 6195035 | Cylindrical monopulse A monopulse antenna system comprising an inner antenna and an outer antenna disposed symmetrically about a central axis of symmetry. A central aperture is located at the axis of symmetry through which a weapon system may fire or an additional sensor may b... | 02/27/2001 |
| 6166678 | Fourier-transform-based adaptive radio interference mitigation A signal process is provided for radar interference mitigation in SAR data and to perform several functions. Initially, the algorithm separately removes the average range bias of the I-channel and the Q-channel data. Next, I- and Q-channels are equalized ... | 12/26/2000 |
| 6118402 | Process for side lobe suppression and amplitude or phase monopulse radar device The process is used for suppressing the effect of signals that are received or sent via side lobes of an antenna (PA; HA) of an amplitude or phase monopulse radar device, in which for the purpose of position measurement of a first and, if need be, a secon... | 09/12/2000 |
| 6078824 | Wireless base station equipment A wireless base station equipment includes a transmission power controlling unit for controlling a transmission power of a transmitted signal to be transmitted to a mobile station in accordance with a status of signal reception from the mobile station and... | 06/20/2000 |
| 6018315 | Method and system for attitude sensing using monopulse GPS processing A space vehicle uses a signal received from a global positioning system (GPS) satellite (51, FIG. 1) to determine the attitude of a space vehicle. The signal is received through a pair of antennas (10, 11) and converted to sum and difference outputs by a ... | 01/25/2000 |
| 5847673 | System and method for determining a position of an object using output from a radar system An inertial navigation system (INS) and a monopulse radar system are mounted on a body. The inertial navigation system outputs at least a velocity of the body. Either a synthetic aperture radar (SAR) map or doppler beam sharpening (DBS) map is created usi... | 12/08/1998 |
| 5841400 | Estimator of direction of desired signal A desired signal is received at first and second antennas. Output signals of the first and second antennas are orthogonal-detected by first and second signal conversion circuits and thereby converted into first and second baseband signals. A complex conju... | 11/24/1998 |
| 5831570 | Radar resolution using monopulse beam sharpening A method and apparatus for improving resolution of targets in a monopulse radar beam.... | 11/03/1998 |
| 5751249 | Radio transmission system and a radio apparatus for use in such a system A radio transmission system comprises a phased-array radio apparatus for optimizing reception in a multipath transmission environment. In the phased-array radio apparatus, phase shifting is performed after down-conversion of received RF signals. Phase con... | 05/12/1998 |
| 5694131 | Method and apparatus for detecting multipath interference in a radar receiver A method and apparatus for detecting the presence of multipath interference within a radar receiver disposed to form sum (Σ) and difference (Ɗ) signals by time-sampling a target return signal is disclosed herein. In accordance with this method there is ... | 12/02/1997 |
| 5619206 | Secondary radar digital monopulse receiving apparatus and method A secondary radar uses monopulse reception techniques to improve the estimate of the aircraft position and to improve the reliability of the reply decoding process. Digital signal processing techniques are utilized to replace the analog circuit used in th... | 04/08/1997 |
| 5576711 | Monopulse signal processor and method using same A monopulse signal processor provides target monopulse ratios and thus target angles having an improved accuracy in those situations where a low signal-to-noise ratio subsists and the monopulse ratio is derived from a sequence of pulses. The monopulse rat... | 11/19/1996 |
| 5493303 | Monopulse transceiver A dual channel monopulse transceiver is described for use at millimeter wavelengths and for the detection of targets for vehicle collision avoidance. A microstrip antenna is located on one side of a plate and a transceiver microstrip circuit coupled to th... | 02/20/1996 |
| 5473331 | Combined SAR monopulse and inverse monopulse weapon guidance A system and method that provides for all-weather precision guidance of conventional air-to-surface weapons. The system and method employs a coherent monopulse radar disposed on a launch platform and a noncoherent passive (receive only) radar disposed on ... | 12/05/1995 |
| 5450089 | Monopulse thresholding A monopulse thresholding processor and method for improving resolution by using the difference channel data to eliminate "excess" sum channel returns. The processor may be used with a radar system that comprises an antenna, a transminer, a receiver for pr... | 09/12/1995 |
| 5402130 | Monopulse processor In a monopulse radar processor, the usual sum (s) and difference (d) signals are manipulated to produce two other signals (s+ad and s+bd, in which a and b are constants). The phase of each of these derived signals with respect to the sum signal is then de... | 03/28/1995 |
| 5341145 | Method for tracking a radar target In a method for tracking a radar target the imaginary part of the complex elevation error signal is utilized and the value of the complex elevation error signal is calculated for a plurality of frequencies in a repeated sequence. The value change between ... | 08/23/1994 |
| 5331326 | Correcting errors in crossfeed radar systems A method for correction errors in radar systems that operate using a crossfeed principle (CFR), in which echo signals are directly received from flying objects, such as an aircraft. In particular, the present invention is used in connection with low-flyin... | 07/19/1994 |
| 5278564 | Method and apparatus for the determination of the height of a target Radar apparatus for determining the height of a low-elevation target, the target being illuminated by a transmitter (7) and an antenna (3) via a TR-switch (6). Electromagnetic radiation reflected directly by the target and indirectly by the target via the... | 01/11/1994 |
