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Class 342/384 - Difference of each antenna channel signal


Subclass of Class 342 - Communications: directive radio wave systems and devices (e.g., radar, radio navigation)
Definition: Subject matter wherein the receiving apparatus contains
No. of patents: 43
Last issue date: 03/04/2008


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NumberTitleIssue Date
7340281Method and system for enhancing reception of wireless communication signals
A method and system is disclosed for enhancing reception of wireless communication signals. A beam pattern including at least one set of beams is generated. Where the beam pattern includes at least two sets of beams, the beam sets may be offset with respect to each ...
03/04/2008
7315745Radio positioning systems
The invention provides a method of estimating the time offsets between signals transmitted by plural transmitters of a communications network and received by a receiver attached to a terminal. In the method a section of a representation of the signals from the plura...
01/01/2008
7231151Cosite interference rejection system using an optical approach
A cosite interference rejection system allows cancellation of large interfering signals with an optical cancellation subsystem. The rejection system includes an interference subsystem coupled to a transmit system, where the interference subsystem weights a sampled t...
06/12/2007
7190746Multiple lobe dot product detector for M-code GPS receivers
A positioning system receiver is disclosed. The positioning system receiver includes an antenna for receiving radio frequency (RF) signals. The positioning system receiver also includes a radio frequency front end system configured to convert the received RF signals...
03/13/2007
7183972Communications system that reduces auto-correlation or cross-correlation in weak signals
The present invention discloses methods, apparatuses, and systems for eliminating auto- and cross-correlation in weak signal CDMA systems, such as GPS systems. The invention uses parallel data paths that allow standard correlation of signals in parallel with verific...
02/27/2007
7136012Approach radar with array antenna having rows and columns skewed relative to the horizontal
A monopulse precision landing or other land-based radar system uses an array antenna and a beamformer to produce sum, azimuth difference and elevation difference beams relative to the array. The rows and columns of the array are skewed relative to the horizontal for...
11/14/2006
7030813Array 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
7010277Arrangement and method for interference cancelling
The present invention relates to an apparatus for cancellation of electromagnetic interferences (n), including means (3) for dividing a reference signal (sc) into a first and second signal (scl, scQ) having different phases, t...
03/07/2006
6788251Method and apparatus for interference reduction in a positioning system
Embodiments of the present invention relate to a method and apparatus for reducing interference in a positioning system. According to one or more embodiments of the present invention, the receiver in a conventional positioning system is configured to communicate wit...
09/07/2004
6720908Sensor front-end for range and bearing measurement
A method for measuring range and bearing of an object. At least a portion of a first signal is transmitted from a sensor. The transmitted signal is reflected from an object and received by the sensor. At least a portion of the first signal is applied a first mixer a...
04/13/2004
6297772Predicting coherent sidelobe canceller
A system for instrumenting time sampled predicting interference suppression, particularly in a side-lobe canceller system. Main and auxiliary channel signals are supplied to a canceller loop where correlating weights are sampled just prior to a radar puls...
10/02/2001
6208296Method and apparatus for training a receiver on a source
A method and apparatus for training a receiver on a source are provided. The receiver is an antenna and the source is a broadcast satellite. A first signal sensor receives at least one signal from the source. The first signal sensor may be a first low noi...
03/27/2001
6127973Signal processing apparatus and method for reducing the effects of interference and noise in wireless communication systems
A signal processing apparatus for minimizing interference and for reducing effects of noise by controlling beam patterns of a telecommunication system having an array antenna, comprising: a means for computing a residue vector, by using a signal vector pr...
10/03/2000
6061016Method for the attenuation of the clutter coming from the reflection lobes of a radar antenna
The disclosed method uses the ancillary antennas of a radar, and consists in determining the positions of the phase centers of these ancillary antennas, compensating for the difference in optical path between the reflection lobe of the processed channel a...
05/09/2000
5694133Adaptive direction finding system
This invention relates to automatic direction finding methods and systems for an electromagnetic or acoustic signal source by utilizing the concept of adaptive nulling of a narrow or wideband signal received by one sensor from the same signal received by ...
12/02/1997
5635939Device and method of using an auxiliary antenna outfitted with an adaptive space filter for anti-jamming a major associated antenna
The invention pertains to the sensing and elimination of jamming signals transmitted by jammers towards radar antennas. According to the invention, we associate with a main space surveillance radar antenna an auxiliary antenna that is outfitted with a mod...
06/03/1997
5578933Distance measuring system
A distance measuring system for measuring a distance between two objects has a transmitter assembly mounted on one of the two objects, for transmitting a plurality of electromagnetic waves having respective wavelengths different from each other at respect...
11/26/1996
5579016Phased array multiple area nulling antenna architecture
An adaptive nulling communication system for nulling undesired signals from communication signals in multiple separate and distinct coverage areas is disclosed. The adaptive nulling communication system includes a phased array antenna having multiple rece...
11/26/1996
5510796Apparatus for wind shear compensation in an MTI radar system
The invention relates to apparatus for reducing the masking effect in the doppler frequency domain of wind sheared clutter upon the radar returns of moving targets. The invention consists in forming two beams from the elements of a radar antenna array by ...
04/23/1996
5502448Method and means for short pulse interference rejection
A radar interference circuit which rejects both continuous noise and shorulse interference signals. A plurality of omni-directional antennas are placed around the main directional radar antenna and connected in differing sets to a plurality of canceller ...
03/26/1996
5491487Slaved Gram Schmidt adaptive noise cancellation method and apparatus
A method and apparatus are provided for filtering noise from a plurality of input signals in a sensor system. One first main input signal and several first auxiliary input signals are obtained and interior weights corresponding to the first main and auxil...
02/13/1996
5363104Jamming signal cancellation system
Improved radar system performance in a jamming environment is achieved by detecting the AM difference frequency produced by the beating of the desired radar signal with the jamming signal and applying same to one input of a balanced modulator while simult...
11/08/1994
5361074Mainlobe canceller system
An interference suppression system for cancelling undesired signals recei through the mainlobe of an antenna as well as its sidelobes. The interference suppression system has a main channel input having high gain for receiving desired signals and undesir...
11/01/1994
5359329Jammer reference target measurement system
A system for cancelling jammer signals entering the mainlobe of a monopulse adar and providing target locations with respect to the jammer position comprising for a sequential lobing embodiment: measuring the angular position of the jammer in the radar's m...
10/25/1994
5351058General purpose sidelobe canceller system
A digital, open-loop, sidelobe canceller system includes an arrangement of uxiliary-channel preprocessing cancellers and a series of main-channel cancellers in which specific cancellers average a different number of samples for cancelling both barrage (con...
09/27/1994
5296865MTI compatible coherent sidelobe canceller
A system for instrumenting time sampled interference suppression, particuly in a side-lobe canceller system. Interference signals are sampled just before a radar transmits on command of a sample gate or radar pulse, with main and auxiliary channel signal...
03/22/1994
5291209Coherent side lobe canceler
The elimination of jamming signals from received radar signals is conventionally accomplished by side lobe cancellation techniques. Large interfering signals caused either by clutter or other sources, however, can cause intolerable degradation of coherent...
03/01/1994
5260707Phase coherent interference signal suppression system and method
An interference signal suppression system and method that suppresses coherent jamming signals. The system comprises first and second receiving antennas that are physically separated from each other to generate non-coherent received signals of interest. Th...
11/09/1993
5049890Sampled data processing
An improved signal processing system and technique for preprocessing auxiry data signals by sequential decorrelation, particularly for use in systems employing adaptive cancaller loops. Each of a plurality of signal channels sample the environment of a p...
09/17/1991
5027123Adaptive interference canceller
An adaptive interference canceller for use in a dual polarized radar system for receiving cross-polar and like-polar signals and generating an output signal corresponding to the received cross-polar signal with a like-polar interfering component cancelled...
06/25/1991
4893128Troposcatter diversity sidelobe jamming suppressor
Sidelobe jamming in dual diversity troposcatter link receivers is effectively suppressed by providing an auxilliary low power antenna, the output of which is differenced from the high power main antenna signals prior to processing in the receivers's dual ...
01/09/1990
4885590Blind speed elimination for dual displaced phase center antenna radar processor mounted on a moving platform
A radar system mounted on a moving vehicle uses a displaced phase center antanna (DPCA) and associated processing for taking the difference between the two signals received by the displaced antennas to provide moving target indication (MTI) by cancellatio...
12/05/1989
4849764Interference source noise cancelling beamformer
A beam is directed to an interfering source to obtain the best estimate of this signal. The beamformer output is fed into an inverse beamformer in such a way that the total delay experienced by a signal from any element of the array is the same as that of...
07/18/1989
4713668Adaptive antenna
A steered adaptive antenna arrangement including an adaptive beamforming network 10 to which the output signals of an array of antenna elements are applied, the network having a feedback wherein the summed output of the network is correlated with each ele...
12/15/1987
4697188Interference canceler with difference beam
Undesired signals from interfering satellites are separated from desired signals from a target satellite by using a sum beam and a difference beam as in a monopulse radar. Both desired and undesired signals are received by an antenna and separated by diff...
09/29/1987
4689628Adapive sidelobe canceller system
An improved signal processing technique for developing a plurality of indndent samples, particularly for use in a canceller system receiving interference from a plurality of sources. Each of a plurality of signal channels sample the environment from a pl...
08/25/1987
4688187Constraint application processor for applying a constraint to a set of signals
A constraint application processor is arranged to apply a linear constraint to signals from antennas. A main antenna signal is fed to constraint element multipliers and then to respective adders for subtraction from subsidiary antenna signals. Delay units...
08/18/1987
4638318Small angular beamwidth antenna system
A relatively narrow beamwidth (10° or less) receiving antenna patt is formed at the receiver end of a radio frequency transmission link where a plurality of radiating sources are operating in a dense communications environment. The antenna pattern compr...
01/20/1987
4608569Adaptive signal processor for interference cancellation
The present invention relates to an adaptive signal processor for reducing interference in ranging and communication systems resulting from jamming or multipath reception. More particularly, an optical signal processor is provided in which a first time co...
08/26/1986
4516126Adaptive array having an auxiliary channel notched pattern in the steered beam direction
An apparatus for cancelling undesired signals affecting an antenna system. The apparatus includes a plurality of adaptive modules. Each module provides sum and difference signals from a pair of antennas in the system. Each difference signal is weighted by...
05/07/1985
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