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8179319 |
Adaptive optimization of estimation of the angle of arrival of a signal received by an array of antenna elements
A parameter of interest of a signal, such as the angle of arrival of a target signal received by an antenna system having an array of antenna elements, is estimated by (a) obtaining disparate...
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8035562 |
Digital beam-forming apparatus and technique for a multi-beam global positioning system (GPS) receiver
An advanced multiple-beam GPS receiving system is achieved that is capable of simultaneously tracking multiple GPS satellites independently, detecting multiple interference signals individually,...
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8022873 |
Methods and system for determining angles of sight between two devices
A method of determining angles of sight between a receiver device having at least two reception antennas and at least one transmitter device having at least one transmission antenna for the...
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8022874 |
Method 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...
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7982672 |
Reception device
A reception device includes a receiver, a direction detector, a location information acquisition component and a location calculator. The receiver receives broadcast signals sent from transmission...
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7756471 |
Systems and methods for multi-element antenna arrays with aperture control shutters
Embodiments include systems and methods for controlling beam direction of an array of antenna elements in a wireless communications system. In one embodiment, aperture control shutters...
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7705781 |
Histogram for ambiguity visualization and evaluation (HAVE)
A method is provided for constructing a histogram to represent the root-mean-squared phase differences for a signal received at pairs of elements in an array. A pair-wise element phase difference...
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7692586 |
Sparse interferometric array for radio frequency azimuth direction finding
A sparsely populated array of antenna elements on a plane is provided such that the angle of arrival (AoA) measurement for a radiofrequency signal received by the array has high resolution and is...
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7683757 |
Multi-antenna system and method for remotely controlling a function
A system and method for remotely controlling a function. The system includes a transmitter and a receiver control circuit having a plurality of antennas. The transmitter transmits a wireless...
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7450922 |
Data unit detection including antenna diversity
A system adjusts a receiving device in response to sensing symbols. An automatic gain control is adjusted in response to receiving a first symbol of a data unit from a first antenna. After...
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7436358 |
Signal 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...
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7409227 |
Radio 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...
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7382275 |
Mobile 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...
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7380455 |
System 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...
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7213442 |
Methods 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...
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7092673 |
Angle 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...
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7081847 |
Radar 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...
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7010304 |
Cell 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....
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7002461 |
Passive 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...
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6972663 |
Method 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....
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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...
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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...
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6907270 |
Method 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...
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6897807 |
Radio-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...
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6834251 |
Methods 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...
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H002109 |
Passive 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...
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6774845 |
Single 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...
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6765532 |
Wideband 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...
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6700536 |
System 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...
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6664921 |
Apparatus 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...
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6621417 |
Passive 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...
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6407702 |
Method 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...
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6392598 |
Cable 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.
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6388604 |
Circuit 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...
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6377214 |
Pipelined 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...
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6351238 |
Direction 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...
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6313794 |
Method 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...
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6278406 |
Direction 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...
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6255991 |
Low 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...
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6239747 |
Antenna 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...
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6225949 |
Method and apparatus for a ring interferometer
A method and apparatus for determining the azimuth and elevation angles of a signal from an emitter is provided. An antenna array receives the signal. The antenna array includes one or more pairs...
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6195043 |
AOA estimation and polarization induced phase correction using a conformal array of titled antenna elements
An apparatus and method for determining the angles-of-arrival and the polarization states of incoming RF signals of unknown polarization using five or more RF sensing antenna elements of differing...
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6195559 |
Communication system, a primary radio station, a secondary radio station, and a communication method
A communication system has a primary radio station and a portable radio station. The primary radio station communicates with the portable radio station. The portable radio station is freely...
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6169519 |
TCAS bearing measurement receiver apparatus with phase error compensation method
A TCAS receiver, including a relative bearing measurement radio receiving apparatus for use with an antenna array having four antennas where each antenna has associated with it, its own receiver...
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6011514 |
Means for extracting phase information for radio frequency direction of arrival
The extraction of phase information for radio frequency (RF) direction of rival is attained by pre-detect sensing and quantization of differential phase of a RF wave impinging on two or more...
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5990834 |
Radar angle determination with music direction finding
An apparatus and method for target-angle determination using lower-frequency radars having compact non-moving antennas over broad viewing sectors. Use of direction finding (DF) in place of beam...
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5945947 |
Synthetic doppler direction finder for use with FSK encoded transmitters
A radio direction finder based on the simulated Doppler frequency shift principle is disclosed that is applicable to FSK encoded pulsed transmissions. Typical applications include tracking of...
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5936575 |
Apparatus and method for determining angles-of-arrival and polarization of incoming RF signals
An apparatus and method for determining the angles-of-arrival and the polarization states of incoming RF signals of unknown polarization using three or more RF sensing antenna elements of differing...
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5905463 |
Linear array aircraft antenna with coning correction
Aircraft-mounted Identification Friend or Foe (IFF) antennas employ a linear array of radiator elements positioned transverse to the boresight axis. With an azimuth determination capability, but...
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5745071 |
Method and apparatus for precisely locating a resonant object
The method and apparatus precisely identifies and locates an object which resonates in response to signals of at least one and, more typically, two resonant frequencies. The locating apparatus...
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