Matches 1 - 50 out of 161 1 2 3 4 >


Match Document Document Title
8077088 Method for single satellite geolocation of emitters using an ambiguous interferometer array  
A method of locating a terrestrial emitter of electromagnetic radiation in the midst of a plurality of emitters in a satellite in orbit about the earth which utilizes a location estimation and...
8063824 Magnitude-squared coherence filtering in a time difference of arrival (TDOA) or group delay interferometric geolocation system  
In a geolocation system for determining a geolocation of a target emitter, a method for determining the geolocation. The method comprising: (a) receiving a signal transmitted from the target...
7961147 Long baseline phase interferometer ambiguity resolution using frequency differences  
A method for determining an angle-of-arrival for a detected signal. The method includes the steps of receiving the signal at a first antenna, receiving the signal at a second antenna, generating a...
7898479 System and method for signal extraction and angle of arrival determination  
A method of integrating a detected signal along a given angle of arrival to improve detection. The method includes receiving the signal at a first antenna, receiving the signal at a second antenna,...
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...
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...
7663548 Switched combiner GPS receiver system  
A receiving system includes a combiner configured to receive signals from two or more antenna elements and to generate sum and difference outputs, and a switch configured to sequentially provide...
7436359 Method for single satellite geolocation of emitters using an ambiguous interferometer array  
A method of locating a terrestrial emitter of electromagnetic radiation in the midst of a plurality of emitters in a satellite in orbit about the earth which utilizes a location estimation and...
H002224 Self-calibrating large baseline interferometer formed from two aircraft  
A method to passively locate an emitter using two aircraft to form a large baseline interferometer. The basic two element (two aircraft or helicopters) large baseline interferometer includes...
7427953 Wireless communication apparatus for determining direction of arrival information to form a three-dimensional beam used by a transceiver  
A wireless communication method and antenna system for determining the direction of arrival (DOA) of received signals in azimuth and elevation, (i.e., in three dimensions), to form a beam for...
7421212 Detecting and locating pulses using a Bragg cell  
Detecting a pulse of a signal includes receiving the signal and a light beam. The signal drives a spatial light modulator to modulate the light beam, where the complex amplitude of the modulated...
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...
7286085 Precision geolocation system and method using a long baseline interferometer antenna system  
A long baseline interferometer antenna system and method for determining the location of an emitter. The long baseline interferometer antenna system comprises a first antenna, a second antenna, an...
7268728 Moving transmitter correlation interferometer geolocation  
A Moving Transmitter Correlation Interferometer Geo-Location (MT-CIGL) system is disclosed that permits locating both moving and stationary transmitters from moving DF equipment. A conjugate...
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...
7042393 Thinned array antenna system  
An antenna comprised of a plurality of identical subarrays each having N antenna elements. The antenna elements of a core of subarrays all contribute outputs which are used for forming sum and...
7026990 Interferometer arrangement for unambiguous determination of an angle of incidence of incident electromagnetic radiation  
An interferometer arrangement includes an antenna array that receives radiation from a plane wave emitted by a transmitter, the radiation being incident on the array at an angle (θ). The array ...
6965343 System and method for antenna tracking  
A method for antenna tracking includes providing a central feed element in an antenna focal region with additional feed elements in an azimuth coordinate to provide a multitude of feed elements...
6839025 Precision direction finding sensing systems and methods  
Methods and systems are provide for precision direction finding capabilities for a sensing system, the method comprising providing a sensing system that utilizes an amplitude direction finding...
6784826 Body motion tracking system  
Methods and apparatus are disclosed for measuring position and motion of a “marker” antenna (14), disposed on a subject (12) at a physical location to be tracked. Relative distance of the mar...
6759981 Enhanced emitter location using adaptive combination of time shared interferometer elements  
An interferometer array system for processing pulse signals from a target emitter includes an n element interferometer array of radiator elements for producing radiator signals in response to the...
6744407 Method and device for space-time estimation of one or more transmitters  
Method and device for space-time estimation of one or more transmitters based on signals received using an antenna network. Signals received using the antenna network are separated in order to...
6697012 Altitude estimation system and method  
A system and method for detecting and tracking a target object, including the calculation of the target object's altitude, is disclosed. During the processing of signals received by a receiver, the...
6677884 Satellite configuration for interferometric and/or tomographic remote sensing by means of synthetic aperture radar (SAR)  
For interferometric and/or tomographic remote sensing by means of synthetic aperture radar (SAR) one to N receiver satellites and/or transmitter satellites and/or transceiver satellites with a...
6657591 Method and apparatus for joint identification and direction finding  
A method and apparatus for tracking a target. A signal from the target is received using a directional antenna and is digitized to provide a time series of samples. The samples are transformed,...
6639552 Method of and apparatus for deriving a signal for enabling a radio wave source location to be derived  
The location of a cellular telephone handset relative to the sites of two pairs of fixed cellular transceivers is determined by responding to the phase difference of radio waves the handset emits,...
6593876 Adaptive microwave antenna array  
An antenna array of “n” individual parabolic dishes is arranged about a center in subarrays extending in North, East, South and West rows. Signals received by the antennas are combined into rep...
6552684 Direction of arrival estimation method and radio reception apparatus  
Spatial profile creation section 102 creates an intensity distribution, that is, a spatial profile or spatial information of reception signals with respect to the directions of arrival of signals...
6421008 Method to resolve interferometric ambiguities  
A method for resolving interferometric ambiguities for an interferometer system with antenna elements employs multiple interferometric elements within the baseline. The overall accuracy of the...
6421000 GPS multipath mitigation using a multi-element antenna array  
A method and apparatus for mitigating multipath signal distortion using a multi-element antenna array is provided. The multi-element antenna array is used to discriminate between the desired signal...
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...
6281841 Direction determining apparatus  
A system for determining the direction that an object is pointing is disclosed. The pointing direction is calculated by determining phase differences between signals arriving at different positions...
6266585 Gyrocompassing by intermittent GPS interferometry  
6255992 Self-calibrating large baseline interferometer for very precise emitter location using time difference of arrival and time difference of arrival rate  
A passive system for locating a distant source of radio frequency energy, for example a pulsed radar transmitter, from a portable platform such as a moving aircraft. The disclosed system is non...
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...
6198436 Integrated interferometer and instantaneous frequency measurement device and method  
An integrated receiver includes an Instantaneous Frequency Measurement (IFM) device, an interferometer and switches. The IFM receives signals from a target and determines the frequency of the...
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...
6184830 Compensation of direction finding estimates for polarimetric errors  
An algorithmic technique which allows antenna arrays that are used for interferometric direction finding to have elements with arbitrary orientation. This technique allows the phase errors...
6130644 Method and apparatus for geodetic surveying and/or earth imaging by satellite signal processing  
A method of geoid measurement and/or earth imaging, characterized in that at least one directional antenna (2) is used to pick up a radio signal from a satellite and reflected on the ground, and...
6104346 Antenna and method for two-dimensional angle-of-arrival determination  
An antenna and system for determining two-dimensional angle-of-arrival includes circular array interferometers for azimuth, linear interferometers for elevation, and a mast for positioning the...
5955993 Detection of spread spectrum signals  
A spread spectrum signal detection system comprising two spatially separated receivers, a correlator, such as a time integrating correlator employing acousto-optic cells, which is connected to the...
5955990 Linear interferometer antenna capable of making error-free azimuth and elevation angle measurements  
A linear interferometer antenna for making azimuth angle measurements and elevation angle measurements of an identified target. The antenna includes six radiating elements which receive signals...
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...
5924056 Device and method for measuring gravitation  
Gravitation in three dimensions is measured using an accelerometer attached to a carrier, a satellite navigation receiver and a computer. The satellite navigation receiver determines a position and...
5917448 Attitude determination system with sequencing antenna inputs  
An attitude determination system uses multiple antenna inputs which are time-multiplexed into a multi-channel receiver. Each channel tracks one incoming signal from a known or ascertainable source....
5914687 Combined phase-circle and multiplatform TDOA precision emitter location  
A method for determining the geolocation--i.e., the latitude, longitude, and altitude--of a stationary emitter emitting an RF signal. The method employs at least one moving observer to measure...
5870056 Air-to-air passive location system  
A system is disclosed for estimating the position and velocity of a moving transmitter making use of both Doppler frequency measurements and LBI phase measurements. The frequency measurements and...
5854601 Methods for estimating the number of emitters and their parameters  
A method for estimating the number of emitters of intermittent or periodic pulsed energy waveforms received at a sensor location and the parameters of the intermittent or periodic energy waveforms,...
5852420 Antenna device  
An antenna system is made up by a main antenna and a sub antenna which is adjacent the main antenna in a direction not perpendicular to the direction of beam scan of the main antenna and which has...
5841397 Autotracking antenna system  
An autotracking antenna system operable to cause a steerable antenna assembly to automatically track a moving RF video signal source has a reflector, a rotator for positioning the reflector at any...
Matches 1 - 50 out of 161 1 2 3 4 >