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Class 342/445 - Having more than two antennas


Subclass of Class 342 - Communications: directive radio wave systems and devices (e.g., radar, radio navigation)
Definition: Subject matter wherein the direction finding receiver is
No. of patents: 86
Last issue date: 09/20/2011


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NumberTitleIssue Date
8022874Method and system for detecting signal sources in a surveillance space
A respective electromagnetic parameter and spatial disposition of an unknown number of signal sources in a surveillance space simultaneously bombarded by multiple signals are determined by receiving multiple signals at each of a plurality of widebeam, wideband anten...
09/20/2011
7440758Cell planning methods and apparatus, and networks configured based on same
Coverage areas for wireless networks are divided into a plurality of cells that are arranged in rows. Channel frequencies are assigned to cell sectors and associated with respective antenna axes. The antenna axes of adjacent rows are alternatingly rotated, thereby r...
10/21/2008
7436358Signal arrival direction deducing device, signal arrival direction deducing method, and signal direction deducing program
A signal arrival direction deducing device capable of deducing the signal arrival direction even when a correlation matrix between input signals and noise correlation matrix are singular. A state is observed in which only noise is present and a state is observed in ...
10/14/2008
7409227Radio apparatus
The invention relates to a radio apparatus for estimating a direction from which a received wave arrives and forming a radio transmission channel between a transmitting end of the received wave and itself. The invention aims to maintain stable transmission quality. ...
08/05/2008
7382275Mobile enforcement reader
A mobile enforcement reader (MER) includes an antenna, a reader coupled to receive signals from the antenna and a control/display unit (CDU) coupled to the reader. The CDU selects a receive direction and processes signals provided thereto from the reader. When the M...
06/03/2008
7380455System and method for resolving phase ambiguity of a transducer array to determine direction of arrival of received signals
System and method for resolving phase ambiguities of various transducer arrays, including non-coplanar interferometer antennas on an aircraft skin, in order to determine the direction of arrival of a signal received by the array and emitted by a source remote from t...
06/03/2008
7289058Radar apparatus
The present invention relates to a radar apparatus that forms multiple digital beams based on reflected waves of a transmitted radio wave. A transmit signal is transmitted in a predetermined cycle from one of transmitting/receiving antennas A1 to A4 ar...
10/30/2007
7213442Methods of arranging transducers and transducer arrays having reduced phase ambiguity for determining direction of arrival of received signals
Method of arranging transducers, including non-coplanar interferometer antennas on the outer surface of an aircraft, to minimize phase ambiguities when determining the direction of arrival of a signal received by an array of the transducers and emitted by a source r...
05/08/2007
7201054System and method for resolving phase ambiguity of a transducer array to determine direction of arrival of received signals
System and method for resolving phase ambiguities of various transducer arrays, including non-coplanar interferometer antennas on an aircraft skin, in order to determine the direction of arrival of a signal received by the array and emitted by a source remote from t...
04/10/2007
7173561Radar device capable of scanning received reflection waves
The present invention relates to a radar device for forming multi-beams in multiple channels from reflected waves of a transmitted wave by using a minimum number of antennas. The device has: antennas used for both transmission and reception A1–A4; tr...
02/06/2007
7117016Adaptive antenna base station apparatus
An adaptive antenna base station apparatus comprises an array antenna including N (N being a natural number) antenna elements; N reception sections for respectively performing orthogonal detection of high-frequency signals, respectively received by the antenna eleme...
10/03/2006
7092673Angle of arrival estimation in a wireless telecommunications network
The present invention relates to estimating the Angle of Arrival (AoA) of a signal from a user equipment received at a base station of a wireless telecommunications network where the base station has a multi-beam antenna. A signal received from a user equipment is r...
08/15/2006
7081847Radar system with switchable angular resolution
A radar system with a radar sensor (10) which comprises a transmitting module (20), a receiving module (22) and a supply network (64), wherein the transmitting module (20) comprises a first plurality of partial antennas (26, 28,...
07/25/2006
7079868Smart antenna arrays
The present invention relates to a beamforming method for smart antenna arrays. Smart antennas employ arrays of low gain antennas connected to a combining/beamforming network. Smart antennas can provide enhanced coverage through range extension, hole filling and imp...
07/18/2006
7035319Method and apparatus for determining whether a received signal includes a desired signal
A method of and data processing system for determining whether a received signal in a Code Division Multiple Access system that uses an antenna array includes a desired signal with a predetermined timing offset, the method including correlating 607 the receiv...
04/25/2006
7010304Cell planning methods and apparatus, and networks configured based on same
Coverage areas for wireless networks are divided into a plurality of cells that are arranged in rows. Channel frequencies are assigned to cell sectors and associated with respective antenna axes. The antenna axes of adjacent rows are alternatingly rotated, thereby r...
03/07/2006
7002461Passive RFID transponder/machine-mounted antenna and reader system and method for hidden obstacle detection and avoidance
A system designed to detect and identify fixed utility objects, such as telephone pedestals, power transformers, man-holes, anchor cables, and the like, that are hidden by heavy overgrowth of vegetation. The system provides for automatic look-ahead detection of such...
02/21/2006
6980163Signal leakage detector
An antenna apparatus for detecting a leaked electromagnetic signal is provided. The apparatus includes a telescoping antenna and a casing, which has a portion of the antenna mounted in it. The antenna can move telescopically relative to the casing between an extende...
12/27/2005
6972663Method for detecting portable objects and system for carrying out said method
A method for detecting portable objects from a network of N antennae controlled by a centralized management unit. Signals are simultaneously emitted by the management unit to all antennae. Resulting response signals from antennae that have detected a portable object...
12/06/2005
6950064System 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
6914559Direction 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
6907270Method and apparatus for reduced rank channel estimation in a communications system
A method and apparatus for estimating a communication channel in a wireless communication system having multiple transmitter antennas using reduced rank estimation. The method exploits redundant and/or a priori knowledge within a system to simplify the estimation ca...
06/14/2005
6904308Array system and method for locating an in vivo signal source
A system and method for localizing an in vivo signal source using a wearable antenna array having at least two antenna elements. The signal is received and a signal strength is measured at two or more antenna elements. An estimated coordinate set is derived from the...
06/07/2005
6897807Radio-wave arrival-direction estimating apparatus and directional variable transceiver
A radio-wave arrival-direction apparatus calculates a correlation matrix of received signals by correlation calculation between antenna elements, and calculates a noise spatial eigenmatrix, of which each row or column is an eigenvector belonging to a noise eigen-spa...
05/24/2005
6834251Methods and devices for identifying, sensing and tracking objects over a surface
Methods and devices are disclosed for identifying objects over a surface and for tracking the position of said objects in relation to the sensing surface. The methods include the steps of providing an array of electrodes or coils that generating electromagnetic radi...
12/21/2004
H2109Passive microwave direction finding with monobit fourier transformation receiver and matrix coupled antenna
A passive instantaneous microwave signal frequency identifying and angle of arrival identifying system employing a beam steering multiple element antenna coupled through a Butler matrix to a plurality of simplified Fourier transformation radio receivers wherein unit...
09/07/2004
6774845Single receiver wireless tracking system
A configurable directional antenna includes a center antenna element, a plurality of second antenna elements, and a switch matrix. Each second antenna element, together with the center antenna element, defines an antenna sector. A first portion of the second antenna...
08/10/2004
6765532Wideband signal detection and tracking system
A system is provided for assisting in the detection and tracking of narrowband signals arriving at an antenna array operating over a wide detection bandwidth and in a crowded RF environment. Since the nature of the detection mission is constrained to be a general se...
07/20/2004
6700536System and method for determining a direction of incident electromagnetic signals
A system and method are provided that includes at least a pair of spaced antennas having overlapping fields of view. The system further includes at least a pair of receivers respectively coupled to the pair of antennas. Each of the receivers includes a sp...
03/02/2004
6664921Apparatus for receiving ranging signals
Apparatus for receiving ranging signals (e.g. signals from Global Positioning System satellites) has a receiver coupled to a plurality of spaced antennas. The receiver includes a signal combiner which receives, from a processing circuit, signal components...
12/16/2003
6621417Passive RFID transponder/reader system and method for hidden obstacle detection and avoidance
A system designed to detect and identify fixed utility objects, such as telephone pedestals, power transformers, man-holes, anchor cables, and the like, that are hidden by heavy overgrowth of vegetation. The system provides for automatic look-ahead detect...
09/16/2003
6407702Method and system for obtaining direction of an electromagnetic wave
A method and a system are disclosed which utilize the polarization properties of electromagnetic fields for a determination of the direction to the source of the electromagnetic radiation. The method and system primarily use a particular antenna device wi...
06/18/2002
6392598Cable phase calibration in a TCAS
An apparatus and method determining angle-of-arrival of a received radio frequency signal, and apparatus and method for calibrating the angle-of-arrival determining apparatus....
05/21/2002
6388604Circuit for LPI signal detection and suppression of conventional pulsed signals
A pulse Low Probability of Intercept (LPI) signal discriminator has a soft-limiting IF amplifier chain for receiving an IF signal to soft-limit any high-peak IF signals in the IF signal and a high-peak amplitude compressive circuit followed by an integrat...
05/14/2002
6377214Pipelined processing algorithm for interferometer angle of arrival estimation
This disclosure describes an electronic support measures (ESM) system for estimating the angle of arrival of a signal which impinges on an array of antennas configured in a straight line. The antennas in the array are spaced such that the distances from t...
04/23/2002
6351238Direction of arrival estimation apparatus and variable directional signal receiving and transmitting apparatus using the same
A direction of arrival (DOA) estimation apparatus of the present invention comprises a plurality of A/D converters that converts a plurality of complex base band signal obtained from the receiving signals of a plurality of antenna elements to respective c...
02/26/2002
6313794Method of detection and determining an angular location of frequency agile emitters
The present invention uses feedback 300 from RF carrier frequency measurements 301 to disassociate the emitter angle-of-arrival component 313 in the ambiguous phase measurement 312 from the initially unknown phase measurement integer ambiguities 314; to t...
11/06/2001
6278406Direction finder and device for processing measurement results for the same
A direction finder is provided that can measure the incoming angles of plural incoming signals without spatially moving antenna elements and can be used in outdoor mobile communication environments. The direction finder also can shorten the measurement ti...
08/21/2001
6255991Low cost angle of arrival measurement system
An interferometer antenna system (32) for measuring the angle of arrival of RF signals. The interferometer antenna system (32) includes a plurality of interferometer antenna elements (36) coupled to a first switching network (42). The first switching netw...
07/03/2001
6239747Antenna system and method for direction finding
An array antenna for direction-finding includes antenna elements which define a triangular outline well-suited for meeting space constraints or reducing reflections from mounting conditions associated with the array antenna. The actual geometric configura...
05/29/2001
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