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| Number | Title | Issue Date |
| 7436351 | Multipath resolving correlation interferometer direction finding Apparatus and a method utilizing correlation interferometer direction finding for determining the azimuth and elevation to an aircraft at long range and flying at low altitudes above water with a transmitting radar while resolving multipath signals. The signals from... | 10/14/2008 |
| 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 |
| 7358891 | Multipath resolving correlation interferometer direction finding Apparatus and a method utilizing correlation interferometer direction finding for determining the azimuth and elevation to an aircraft at long range and flying at low altitudes above water with a transmitting radar while resolving multipath signals. The signals from... | 04/15/2008 |
| 7205933 | Hostile platform position location utilizing networked communications The communication system utilizes transmitters that provide communication transmissions having deterministic data. Receivers of the system have the digital processing capability for correlating received transmission reflections of the deterministic data amongst the ... | 04/17/2007 |
| 7167126 | Radar system and method for determining the height of an object System and method for determining the height of an object reflecting a real beam radar signal by receiving the reflected signal with a first and second vertically spaced antennas. Receivers provide two signals indicating the phase of the reflected signals received b... | 01/23/2007 |
| 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 |
| 7148839 | Operational bistatic radar system synchronization A bistatic radar has a radar transmitter at a first location on a moving platform having a motion and a radar receiver at a second location, remote from the first location. The transmitter illuminates a target along an indirect path with an encoded radar signal. The... | 12/12/2006 |
| 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 |
| 7095984 | Base station apparatus and direction-of-arrival estimating method Signals including a plurality of components representing a phase rotation between antenna elements by combining signals, which have arrived through each path of a first to an m-th paths, for every antenna are generated in RAKE combining sections 104-1 ... | 08/22/2006 |
| 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 |
| 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 |
| 6909396 | METHOD AND DEVICE FOR DETERMINING THE POSITION OF AT LEAST ONE SECOND TRANSMITTING AND RECEIVING DEVICE IN RESPECT OF A FIRST TRANSMITTING AND RECEIVING DEVICE IN A PASSIVE ACCESS CONTROL SYSTEM OPERATING IN THE GHZ RANGE A method for determining the position of at least one second transmitting and receiving device (3) in respect of a first transmitting and receiving device in a passive access control system operating in the GHz range, comprising the steps of using a radar met... | 06/21/2005 |
| 6907269 | Mobile communication base station equipment A mobile communication base station determines the oncoming direction of a radio wave with a simple arrangement and transmits a narrow angle beam in this direction. Received signals from a pair of wide angle beam antennae 21-1 and 21-2 ha... | 06/14/2005 |
| 6853847 | Method and apparatus for positioning a mobile station A positioning apparatus and method for accurately determining a current position of a mobile station. The current position of the mobile station is determined utilizing radio waves arriving from a plurality of base stations installed in a communication area. For cal... | 02/08/2005 |
| 6833805 | Method of compensating for atmospheric effects while using near horizon radar A method of compensating for atmospheric effects to detect the actual location of low elevation objects using near horizon radar to detect an object which utilizes a preexisting satellite, wherein the location of the satellite is known. The method includes a step of... | 12/21/2004 |
| 6772100 | Multipath mitigation filter A technique for estimating the position of an object from sensor measurements in the presence of multipath conditions is disclosed. In one aspect, the technique includes a position estimator comprising a signal filter, a multipath detector, and a multipath bias esti... | 08/03/2004 |
| 6525685 | Method and apparatus for detecting and eliminating signal angle-of-arrival errors caused by multipath This present invention advantageously eliminates the critical deficiencies of current multipath interferometer processing demonstrated in field testing. In particular the present invention substantially improves AOA estimation accuracy and reliability whe... | 02/25/2003 |
| 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 |
| 6400312 | Method and device for object detection Objects of interest are detected which are below the horizon and which emit or are the cause of pressure wave fronts. By emitting radar pulses that interact with the pressure wave fronts that appear above the radar horizon and then by analysis of the dete... | 06/04/2002 |
| 6396434 | Radar transponder Upon receiving a radar electric wave from a search radar, a radar transponder according to the present invention generates a trigger signal in response to the reception of the radar electric wave. In response to only the trigger signal, the radar transpon... | 05/28/2002 |
| 6243037 | Tracking method for a radar system A tracking method for a signal echo system, including generating a plurality of gates for respective propagation modes on the basis of a target state prediction for a dwell time, and generating a target state estimate for the dwell time on the basis of ta... | 06/05/2001 |
| 6005510 | Method for the processing of multiple paths The invention relates to the processing of the multiple paths in an interrogator station which, in response to a salvo of interrogations, receives responses in the form of pulses. The station comprises at least two reception channels. The responses to eac... | 12/21/1999 |
| 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 |
| 5610617 | Directive beam selectivity for high speed wireless communication networks The present invention provides a wireless communication system which employs Butler matrix combiners and circuit switching at transmitter and receiver antenna arrays to provide directive beamwidth capabilities. Such narrow beamwidths permit the communicat... | 03/11/1997 |
| 5583508 | Methods and systems of attitude determination The attitude of a body 12 is determined, or refined, by illuminating it with a direct beam and one or more indirect beams which are reflected from a scattering surface SS, all of the beams being radiated from the same or adjacent sources. The directions o... | 12/10/1996 |
| 5506586 | Multiple-hypothesis, multiple-matched filter system A multiple-hypothesis, multipath-matched filter (10) is disclosed for use in combining multipath components of transmissions between, for example, an aircraft (12) and aircraft (14) through a multipath environment (16). Rather than sensing the characteris... | 04/09/1996 |
| 5371503 | Radar system and method of operating same A method of operating a radar system is shown to include the steps of transmitting a plurality of signals, each signal having a different frequency, and receiving, if existing, a corresponding return signal for each one of the plurality of signals. The me... | 12/06/1994 |
| 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 |
| 5334984 | Method and system for locating direction of transmission source based on wave therefrom A direction finding method and system for locating the direction of a transmission source based on an electromagnetic wave which is transmitted from the transmission source and is received by an antenna means at a receiving end apparatus. The transmission... | 08/02/1994 |
| 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 |
| 5270718 | Method and apparatus for tracking targets from direct and multipath reflected radar signals A method and apparatus to determine angles θ1 and θ2 between paths of two sets of reflected radar waves and a radar boresight utilizes the electrical angles 댡 or 댢 and two successive radar target... | 12/14/1993 |
| 4961075 | Two and one-half dimensional radar system A radar system for determining not only the azimuth and range of a target but also the target height over a predetermined range of elevation angles has separate receiving and signal processing channels coupled to a dual beam antenna for processing signals... | 10/02/1990 |
| 4796031 | Radar system Where reflection coefficient k of the surface of the sea is in a relatively wide range and as the ratio of the antenna height to the wavelength is larger, a radar system can eliminate ambiguities in measuring a target height of a low elevation angle on th... | 01/03/1989 |
| 4472718 | Tracking radar system A tracking radar system which includes a variable frequency oscillator for supplying to a vertical antenna array an oscillation frequency which is changed for each of a number of pulses transmitted from the antenna array. The antenna array transmits an el... | 09/18/1984 |
| 4449127 | System and method for tracking targets in a multipath environment A method and apparatus is described for determining the presence of multipath conditions when tracking a target with a radar wherein the radar includes apparatus for transmitting signals and receiving target reflected signals along two boresight reference... | 05/15/1984 |
| 4316191 | Low angle radar processing means The elevation angle of a low angle target is accurately measured by subtracting from the received radar signal signals derived from an estimated value of target elevation which reduces the resulting signal to a minimum. The estimated value is an accurate ... | 02/16/1982 |
| 4163975 | Method of measuring the altitude of a target maneuvering at a very low elevation, and a tracking radar using same A method of measuring the altitude of a target maneuvering at very low elevations is used to determine the instantaneous deviation of the target at various operating frequencies of a monopulse tracking radar. The quadrature component of the difference sig... | 08/07/1979 |
| 4110752 | Systems for reducing the elevation error for tracking radars of low height targets A system for the automatic correction of the nodding elevation errors for radars tracking targets at low height, comprising in a conventional mode a receiving and transmitting group associated with an intermediate frequency channel and with an antenna ser... | 08/29/1978 |
| 4090197 | Monopulse, fan-beam, search-radar system with improved height and azimuth determination Multipath signals are eliminated at all but the lowest elevation angles awing monopulse techniques to be used to determine target height and azimuth in a two-dimensional, fan-beam, search-radar system. A narrow-azimuth fan beam is oriented at an angle to... | 05/16/1978 |
