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| Number | Title | Issue Date |
| 7999738 | Systems and methods for tracking a remote source and orientation control Systems and methods for tracking a remote source and monitoring and controlling the angular orientation of an antenna array, including a first antenna portion and a second antenna portion, are provided, including a sum-difference structure coupled to a first output ... | 08/16/2011 |
| 7450068 | Phased array antenna beam tracking with difference patterns A system and method for using a phased array antenna to concurrently receive an RF signal transmitted by a remote transmitter, to determine the angular location of the remote transmitter using the transmitted signal, and to use that angular location to direct a tran... | 11/11/2008 |
| 7372401 | Multitracking of collocated satellites Tracking of collocated satellites is accomplished by providing a single tracking antenna having a tracking feed and combiner which receives a first satellite signal. A first pointing error signal is extracted from the tracking feed based on the first satellite signa... | 05/13/2008 |
| 7265716 | Positioning of mobile wireless terminal An apparatus for determining a position of a mobile wireless station comprises means for determining the position of the mobile wireless station in accordance with a position of a first reference wireless station, a position of a second reference wireless station, a... | 09/04/2007 |
| 7218272 | Reducing antenna boresight error Reducing antenna boresight error includes receiving radar pulses reflected from the ground, where pulses are emitted from the antenna of a radar system, reflected by the ground, and received by the antenna. The return pulses carry information about the ground. Measu... | 05/15/2007 |
| 7202815 | Method and apparatus for location determination A location determination device (104) is worn on a user's head to facilitate searching and tracking for another individual carrying a portable radio (102) as well as locating exit routes. At least two antennas (108), a monopulse receiver (110... | 04/10/2007 |
| 7161973 | Pilot aided adaptive minimum mean square interference cancellation and detection A modified adaptive minimum mean square error (MMSE) receiver detects a spread spectrum signal, minimizing interference among multiple users. The receiver receives multiple pilot bits and corresponding data bits. A channel is estimated using at least one of the rece... | 01/09/2007 |
| 7126532 | Apparatus for tracing an optimal direction to receive satellite signal in active phase array antenna system The present invention relates to a signal combining apparatus of the active phase array antenna. The signal combining apparatus includes a plurality of signal distributors for receiving a signal from an antenna array element located at boundary between sub antenna a... | 10/24/2006 |
| 7075495 | Offset hybrid antenna using focuser A Ka-band offset hybrid antenna having a shaped focuser is disclosed. The Ka-band offset hybrid antenna having a shaped focuser, including: a shaped focuser for reflecting a received plane wave to focus an energy of the received plane wave on an offset focal line an... | 07/11/2006 |
| 7068215 | Reducing antenna boresight error Reducing antenna boresight error includes receiving radar pulses reflected from the ground, where pulses are emitted from the antenna of a radar system, reflected by the ground, and received by the antenna. The return pulses carry information about the ground. Measu... | 06/27/2006 |
| 7046720 | System and method for DC offset compensation in a WCDMA receiver A system and method for DC offset compensation wherein a received first signal is despread using a first spreading code to generate a second signal. The second signal along with a first set of pilot symbols is used to estimate a radio channel. The first signal is al... | 05/16/2006 |
| 7030813 | Array antennas with independent sum and difference excitations levels Improved punch-through performance is provided for applications such as sum and difference mode processing for IFF and other applications. With an array including a row of elements, difference sidelobe levels are increased relative to sum sidelobe levels by independ... | 04/18/2006 |
| 6992638 | High gain, steerable multiple beam antenna system A multi-beam antenna system is described herein that can be used in microwave frequency applications between 1 GHz and 100 GHz. The multi-beam antenna system covers four 90° sectors for full 360° coverage. Each 90° sector is covered with at least 1 narrow steerab... | 01/31/2006 |
| 6954176 | Device and method for an antenna array with switchable wide-angle coverage In order in simple manner to switchably cover a wide angle in sectors using an antenna array with broad main lobe, an antenna elements are so arranged, that the elements can be individually selected, so that some elements of the array can be operated in-phase and ot... | 10/11/2005 |
| 6950064 | System and method for ascertaining angle of arrival of an electromagnetic signal A system for ascertaining angle of arrival of an electromagnetic signal having at least one signal characteristic indicating a first state or a second state includes: (a) a plurality of n antenna elements intersecting a common axis and cooperating to establish 2 | 09/27/2005 |
| 6930637 | Method and apparatus for high resolution tracking via mono-pulse beam-forming in a communication system Method and apparatus for high resolution tracking via mono-pulse beam-forming in a communication system in which the capacity and range of mobile or fixed wireless communication base stations are improved by implementing a single or multiple antenna beam per signal ... | 08/16/2005 |
| 6919861 | Array antenna apparatus Antenna elements are provided along a linear line at regular intervals to be parallel to each other. The antenna elements receive signals transmitted from a communicating partner and output the signals to a receiving beam former. In the receiving beam former, phase ... | 07/19/2005 |
| 6914559 | Direction finding method and system using digital directional correlators In an interferometer system, a revolving antenna array is used to sufficiently resolve all ambiguities in determination of frequency and direction of arrival of a wave-front. The frequency and direction of arrival are determined by matching predicted phase differenc... | 07/05/2005 |
| 6906664 | Method and system using a GPS-based phased-array scheme for three-axis attitude determination A method and system for determining three-axis attitude from line-of-sight (LOS) solutions for two or more GPS satellites uses intersections of null cone patterns and LOS vectors to the GPS satellites. In a preferred embodiment, a unified GPS-based sensor also provi... | 06/14/2005 |
| 6847327 | Base station, base station module and method for direction of arrival estimation The invention relates to a base station for a radio communications network. In order to be able to enhance the resolution for a direction of arrival estimation, the base station comprises: a first phasing network (31) for forming beams (B1-B4 | 01/25/2005 |
| 6831601 | Circular array scanning with sum and difference excitation Antennas having a circular array of radiating elements are arranged to enable continuous 360 degree scanning of a sum and difference beam pattern. With a 108 element circular array, a sub array of 27 contiguous elements may be step scanned to 108 positions while mai... | 12/14/2004 |
| 6759982 | Radio direction and position finding apparatus A detection apparatus is provided to detect the direction of arrival and the position of an emission source of radio wave with high accuracy. The apparatus comprises; a first and a second directional antenna 1 and 10 which rotates with a desired angle ... | 07/06/2004 |
| 6618008 | Monopulse phased array system A monopulse phased array system comprises antenna elements with T/R modules controlled a beam steering computer. The space in which the antenna elements are arranged is divided into quadrants which are defined relative to the main axis of the radar beam. ... | 09/09/2003 |
| 6570535 | Single-receiver multiple-antenna RF autotrack control A system and method for RF autotracking multiple antennas (preferably located on a spacecraft) to compensate for disturbances experienced by the antennas. The system and method estimate high frequency errors associated with all of the antennas. The high f... | 05/27/2003 |
| 6567034 | Digital beamforming radar system and method with super-resolution multiple jammer location In a radar system, sampled aperture data are received from an antenna array. The sampled aperture data include data that do not correspond to echo returns from a beam transmitted by the antenna. A covariance matrix is generating using the sampled aperture... | 05/20/2003 |
| 6459406 | GPS patch antenna attitude reference system A pair of patch antennas are used to form a null slit antenna pattern for receiving GPS signals from at least three GPS satellites functioning as pseudo stars for spin rate and spin axis attitude determination for a spinning space vehicle in an earth orbi... | 10/01/2002 |
| 6456238 | Dynamic signal routing in electronically scanned antenna systems An antenna array system with dynamic signal routing to a set of receivers. A monopulse electronically scanned antenna (ESA) has a plurality of antenna elements divided into subarrays. ESA beam steering phase shifters are associated with the respective sub... | 09/24/2002 |
| 6452543 | GPS patch antenna attitude reference method A null slit antenna pattern receives GPS signals from at least three GPS satellites functioning as pseudo stars for spin rate and spin axis attitude determination of a spinning space vehicle in an earth orbit below the GPS satellites.... | 09/17/2002 |
| 6400315 | Control system for electronically scanned phased array antennas with a mechanically steered axis A control system for maximizing performance of an electronically scanned, mechanically augmented phased array (MAPA) antenna. In one preferred form, the control system forms a closed loop system which monitors a signal quality of the received signal from ... | 06/04/2002 |
| 6377212 | Radar apparatus employing a sidelobe blanking system A method and apparatus are provided for determining whether a signal received the main channel (2) of an antenna (1) was incident on the antenna (1) in a direction corresponding to a high gain main lobe. A sidelobe suppression signal is generated from sig... | 04/23/2002 |
| 6373435 | Radio direction and position finding apparatus An object of the present invention is to provide a selective level measuring apparatus with wider dynamic range of effective value detection, compared with the range by a conventional one. The apparatus according to the present invention comprises a gain ... | 04/16/2002 |
| 6320541 | Off-axis indicator algorithm for electrically large antennas A technique is described which makes novel use of monopulse data to augment the normal CFAR detection processing by incorporating monopulse data in a computationally simple way into the detection decision process such that off-axis signals which are of su... | 11/20/2001 |
| 6246365 | Radar apparatus A radar apparatus comprising: a receiving antenna having an array antenna in which a plurality of antenna elements are arrayed in a horizontal direction; and a signal processing section for carrying out recognition of a target existing in a predetermined ... | 06/12/2001 |
| 6236361 | Precision beacon tracking system A system and method for eliminating pointing error in a beacon tracking system due to uncontrolled differences in passive loss or in amplification of the separate signals involved in creating a pilot signal. A locally generated reference signal (30) is ra... | 05/22/2001 |
| 6211813 | Compact monopulse source for a focal feed reflector antenna A monopulse source for a focal feed antenna including at least two waveguides machined in a metal flange supporting a microwave transmission and reception circuit of the antenna, and a dielectric substrate on the metal flange. Also included is a microwave... | 04/03/2001 |
| 5986605 | Method for improving monopulse processing of aperture segment outputs A system and method for estimating azimuth angle, elevation angle and signal detection and which includes an antenna system having a plurality of elements, each element receiving a different concurrent portion of an incoming analog signal having a real an... | 11/16/1999 |
| 5943011 | Antenna array using simplified beam forming network An antenna array for identifying aircrafts operating in a region of interest. The antenna includes a beam forming means and an antenna means. The beam forming means receives, processes and routes a sum and difference beam pattern to the antenna means. The... | 08/24/1999 |
| 5929808 | System and method for the acquisition of a non-geosynchronous satellite signal An antenna having multiple antenna elements that are selectively activated performs an initial acquisition of a satellite signal by activating only a few of the antenna elements. This results in a broad beam width and increases the likelihood of detecting... | 07/27/1999 |
| 5854609 | Satellite tracking method for vehicle-mounted antenna system A satellite tracking method for a vehicle-mounted receiving antenna system to determine the orientations of satellites dependent upon the moving direction of a moving body such as an automobile associated with the attitude control of an antenna which is m... | 12/29/1998 |
| 5754140 | Beam sharpened, low sidelobe antenna system A beam sharpened, low sidelobe antenna is obtained by segmenting the antenna to provide two sub-antennas, one of which is arranged as an interferometer. The output signals of the two antennas are added and subtracted to provide sum and difference signals.... | 05/19/1998 |
