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7616155 |
Portable, iterative geolocation of RF emitters
Iterative geolocation of a stationary RF emitter through the use of TDOA may include the use of a single portable geolocation (e.g., TDOA) sensor, a pair of portable geolocation sensors and three...
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7609207 |
System and method for performing time difference of arrival location without requiring a common time base or clock calibration
A method for performing Time Difference Of Arrival (TDOA) that eliminates the need for a common time base or clock calibration and a system for implementing the method. The method relies on a...
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7551139 |
Multi-platform precision passive location of continuous wave emitters
An apparatus comprises a first sensor mounted on a first platform for sampling a first portion of a continuous waveform occurring in a time window and for producing a first signal sample, a second...
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7545325 |
Method of signal processing
The present invention is a method of finding propagation time and velocity of a transmitter. Specifically, receiving a signal at two or more receivers and using the scalar time relationship to...
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7541977 |
Method and wireless communication system for locating wireless transmit/receive units
A method and system for locating a wireless transmit/receive unit (WTRU) is disclosed. A wireless communication system comprises a plurality of access points (APs). Each AP broadcasts a message...
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7525483 |
Receive device and method for receiving a receive sequence
A receive device for determining a location of a transmitter device includes an evaluator formed to determine a first location of the transmitter device from a time of arrival of a first receive...
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7508344 |
Systems and methods for TDOA/FDOA location
Systems and methods that may be implemented to determine the location of an emitter of electromagnetic radiation, such as an RF signal emitter having an unknown location, using at least two...
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7477191 |
System and method for performing time difference of arrival location without requiring a common time base or clock calibration
A method for performing Time Difference Of Arrival (TDOA) that eliminates the need for a common time base or clock calibration and a system for implementing the method. The method relies on a...
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7468696 |
Method and device for trilateration using LOS link prediction and pre-measurement LOS path filtering
A method for trilateration may include receiving a signal via each of a plurality of LOS paths and predicting performance of each LOS path. The method may also include filtering out signals...
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7450069 |
Ranging system and method
A system and method for estimating the range between two devices performs two or more ranging estimates with subsequent estimates performed using a clock that is offset in phase with respect to a...
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7443342 |
Reception time determining apparatus and distance measuring apparatus using the same
The invention provides a reception time determining apparatus which can measure reception time to a high accuracy, without expanding an occupied bandwidth, and a distance measuring apparatus which...
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7427952 |
Augmentation of commercial wireless location system (WLS) with moving and/or airborne sensors for enhanced location accuracy and use of real-time overhead imagery for identification of wireless device locations
Mobile LMUs can be used in a Wireless Location System to provide detection coverage in areas lacking adequate receiver coverage. The mobile LMUs can be used to detect the radio frequency (RF)...
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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...
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7411551 |
System and method for asynchronous wireless positioning by ordered transmission
Disclosed is a wireless positioning system and method that can perform a high-precision position tracking. The wireless positioning system includes a target device that is an object of wireless...
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7411548 |
Reference beacon identification using transmission sequence characteristics
A method and apparatus for encoding information in a reference beacon signal for use in a time-difference-of-arrival/frequency-difference-of-arrival (TDOA/FDOA) geolocation system. Information is...
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7403157 |
Radio ranging using sequential time-difference-of-arrival estimation
A method determines a position of a target object. A window function is applied repeatedly to a first signal and a second signal of a pair of radio signals received at a pair of passive sensors...
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7392015 |
Calibration methods and structures in wireless communications systems
Calibration methods and structures are provided for wireless communications devices that compensate across a signal bandwidth for relative gain and phase errors between spatial communication...
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7391368 |
Determining the time of arrival of a wireless signal
In an example embodiment, a time of arrival circuit coupled to a wireless transceiver configured to determine a time of arrival of a wireless signal. The time of arrival circuit is operative to...
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7379744 |
Positioning system, positioning method, and positioning server
To provide a positioning system, a positioning method, and a positioning server, which are capable of improving accuracy in detection of a position. In a positioning system, three or more access...
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7375683 |
Use of geo-stationary satellites to augment wide— area multilateration synchronization
The present invention improves WAMLAT Timing Availability by using timing from one or more of a variety of sources. These sources include unaugmented SATNAV timing, from GPS or/and GALILEO, GEO...
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7365682 |
System and method for distributed signal compression for cooperative geolocation
A cooperative geolocation system and method. The system and method involves time stamping a plurality of received signals and modifying, such as compressing, one or more of the received signals,...
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7359711 |
Methods and apparatus for improving accuracy of radio timing measurements
A system, method, apparatus, means, and computer program code for improving accuracy of radio timing measurements. According to some embodiments, a wireless terminal or other wireless device can...
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7346345 |
Positioning in a telecommunications system
A telecommunications system comprises a first transmitter unit situated at a first, known location; a second transmitter unit situated at a second, unknown location; a first receiving unit at a...
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7340217 |
Positional information providing apparatus communication terminal mobile communication terminal and positional information providing method
A positional information service server selects a measuring system most suitable for measuring quality conditions received from a terminal requesting measurement when able to measure position of a...
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7319877 |
Methods for determining the approximate location of a device from ambient signals
The present invention leverages changes in the sensed strength of radio signals at different locations to determine a device's location. In one instance of the invention, inference procedures are...
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7315280 |
Coherent geolocation system
A coherent TOA system is provided for rapidly ascertaining the position of a pulse train emitter such as a radar. Techniques are provided to estimate the underlying repetition interval of the...
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7304609 |
Hybrid wireless ranging system and associated methods
A wireless ranging system includes a first wireless unit and a second wireless unit spaced therefrom. The first wireless unit may include a time-of-arrival (TOA) wireless transmitter, and a...
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7295159 |
Method for measuring time of arrival of signals in a communications network
A method for measuring the Time Of Arrival of signals in a communications network is provided. A transmitter emits a beacon that is a digital message of known content, followed by timing...
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7292189 |
Methods and apparatus for high resolution positioning
The invention relates to a method of signal analysis that determines the location of a transmitter and to devices that implement the method. The method includes receiving by at least three...
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7277052 |
Method for the multistatic detection and locating of a mobile craft through the use of digital broadcasting transmitters
A method to detect and/or locate a mobile craft in a reception system making use of transmitters of opportunity, whose signal comprises elements enabling the synchronization of the receiver,...
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RE39829 |
Method and apparatus for correlating flight identification data with secondary surveillance radar data
A system for correlating secondary surveillance radar (SSR) data and ACARS data which results in a real time correlation of data which are unique to the separate existing systems. More...
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7257412 |
Methods and systems for location estimation
Methods and systems for location estimation. Signals are received from a plurality of satellites and a plurality of base stations by a mobile station. The location of the mobile station is...
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7256737 |
Method and apparatus for geolocating a wireless communications device
The time difference of arrival for a signal received at two or more receiving sites as transmitted from a wireless communications device, is determined by a frequency domain technique. The...
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7250906 |
Methods and apparatus for identifying asset location in communication networks
The location of unmodified wireless assets in a wireless communication network may be identified using time differences of arrivals of a communication sequence at different network receivers....
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7203461 |
Adaptive channel quality estimation algorithm to support link adaptation
RF communications received by a wireless terminal from a servicing base station are used to determine the channel quality such as reported bit error probability (BEP). The RF communications may be...
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7187327 |
Method and system for determining the position of an object
A method and system for determining the location of an object. The system may implement a number of sensors at different locations that are positioned to receive a transmitted or reflected signal...
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7154437 |
Method and system for processing positioning signals based on predetermined message data segment
A method and system for determining a geolocation of an object includes collecting a positioning signal including a predetermined message data segment. A time of arrival of the predetermined...
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7050817 |
Locating method and system
A method for determining a location of a digital radio transmitter includes detecting, by at least three spatially separated receivers, a digitally encoded radio signal, having a known pattern of...
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7039433 |
Methods for determining times and changes of times of transmission, radio communications system and processor
The invention relates to a method for determining transmission times of signals transmitted by at least one radio transmitter BTS. In order to enhance the accuracy and reliability of estimates of...
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7030812 |
Wireless clock synchronization
A system and method for synchronizing internal clocks of receiving stations of a locating system are described. A beacon transmits reference data packets at a known position. A first arrival time...
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7016688 |
Forward link repeater delay watermarking system
A forward link repeater delay watermarking (FLRDWM) system and method that enable accurate position location of mobile stations in areas where repeaters are present by watermarking repeated signals...
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6972718 |
Position calculating method, signal receiver, and position calculating apparatus therefor
A method of measuring reception timings of signals transmitted and received between base stations and a mobile station and calculating the position of the mobile station by using the reception...
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6972717 |
Method and apparatus for enhanced 911 location using power control in a wireless system
A method of locating a mobile telephone includes steps of receiving, transmitting, increasing and determining. In the receiving step, a first base station receives a call from a mobile telephone,...
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6947501 |
Decoder device for decoding packet signals composed of control codes and data codes
A packet signal, formed according to an orthogonal frequency division multiplexing (OFDM) format, received by a receiver is decoded in a decoder device of the receiver. The packet signal includes a...
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6943729 |
Method and system for time difference of arrival (TDOA) location services
A method and system for determining the location of a mobile transmitting device that uses three dimensional location coordinates to triangulate the location using a time difference of arrival...
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6933888 |
Multi-ship coherent geolocation system
A system is provided for rapidly ascertaining the position of a pulse train emitter such as a radar using multiple collectors without requiring more than one platform to measure the same pulse....
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6900762 |
Methods and apparatus for location determination based on dispersed radio frequency tags
Systems and techniques for location determination. A plurality of tags emitting radio frequency signals are dispersed throughout a region, such as a building, within which a user's location is to...
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6885339 |
Discrete radiation source location
A radiation source location technique includes focusing a plurality of receivers (i.e., antennas) at the same location. At least one determined characteristic of the radiation received at each...
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6882315 |
Object location system and method
An RF object locating system and method that uses or includes a set of N (N>2) receivers (monitoring stations) located at fixed positions in and/or about a region to be monitored, one or more...
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6873898 |
Vehicle control system utilizing gps data
A vehicle having a vehicle control system for controlling a performance characteristic of the vehicle and a controller. The controller is coupled to the vehicle control system and adapted to...
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