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| Number | Title | Issue Date |
| 8174448 | Multilateration apparatus In a multilateration apparatus a correlator is provided with a time of arrival correlation window which is set to cater for the path lengths that may be experienced before a signal from an object to be located is received by receivers in the system. This may be on t... | 05/08/2012 |
| 8098200 | Method and system for locating signal emitters using residual values A method and system determine a location of an emitter using at least three sensors, each receiving a signal from the emitter. Cross-correlation data is determined for the received signals at sensor pairs, and one or more peaks are identified in the cross-correlatio... | 01/17/2012 |
| 8077091 | System and method for determining a position of a mobile device within a surveillance volume in the presence of multipath interference A system of determining a position of a mobile device within a surveillance volume includes a phase difference array comprising a spatially diverse array of N sensors for detecting RF signals from the mobile device and acquiring phase difference data from the RF sig... | 12/13/2011 |
| 8049668 | Method and system for locating signal emitters using iterative residual weighting A method and system for determining a location of a first device that emits a signal: provide at least three sensors separated and spaced apart from each other; determine estimated location data for the first device for each sensor or unique sensor pair; determine a... | 11/01/2011 |
| 8044859 | Reference beacon methods and apparatus for TDOA/FDOA geolocation A method and apparatus for estimating bias errors in a time-difference-of-arrival/frequency-difference-of-arrival (TDOA/FDOA) geolocation system using a reference signal transmitter in which position and/or motion information of the reference signal transmitter is e... | 10/25/2011 |
| 8009100 | Radio frequency emitter detection and location method and system A system and method for detecting and locating a radio frequency emitter. A number, N, of receiving units using the same bandwidth, center frequency, and measurement time duration receive signals from the emitter. Higher Order Statistics (HOS) are used to calculate ... | 08/30/2011 |
| 7952523 | Method and apparatus for passively locating radar emissions from rotating transmitters Systems and methods are presented for passive location of transmitters in which two or more receivers time stamp received signals from target transmitters and the time stamped data for each target signal of interest is isolated to identify a peak power time of arriv... | 05/31/2011 |
| 7952524 | Method and system for positioning mobile units based on angle measurements A method and system for positioning mobile units using angle measurements taken by neighboring mobile units is disclosed. A selected mobile unit and mobile units in the vicinity of the selected mobile unit are selectively instructed to measure and report information... | 05/31/2011 |
| 7928908 | Apparatus and method for determining receiver performance in a multilateration system In a multilateration system receivers are grouped into two groups. The first group is used to determine a position of a signal source, for example, an aircraft equipped with a SAR transponder. From the determined position, predicted time of arrival values are produc... | 04/19/2011 |
| 7911385 | RF transmitter geolocation system and related methods A system for geolocating a radio frequency (RF) transmitter in the presence of multipath interference may include a plurality of RF receivers arranged in spaced relation. The system may also include a controller coupled to the plurality of receivers and configured t... | 03/22/2011 |
| 7907089 | Method for tracking a transmitter by means of a synthetic sparse antenna network Method of locating one or more transmitters on the basis of an array of sensors moving with respect to the transmitters comprising at least the following steps: determining the direction vectors âk corresponding to the ... | 03/15/2011 |
| 7893876 | System and method for determining locations of medical devices The location of a medical device is determined by receiving one or more signals at the medical device transmitted by one or more beacons, respectively, at known locations. The one or more signals received at the medical device are sent from the medical device to a p... | 02/22/2011 |
| 7876268 | System and method for precise location of receiving antennas Various aspects of the present invention are shown and described, each of which has stand alone utility in a navigated medical environment. A receiver position calibration system and method facilitates calibration of a reference frame prior to each navigated procedu... | 01/25/2011 |
| 7859465 | System and method for multilaterating a position of a target using mobile remote receiving units A method of multilaterating the position of a target, including the steps of deploying a plurality of time synchronized receiving units in a network that allows the receiving units to communicate with a central processor; receiving a target signal from the target at... | 12/28/2010 |
| 7847734 | System and method for multilaterating a position of a target using mobile remote receiving units A method of multilaterating the position of a target, including the steps of deploying a plurality of time synchronized receiving units in a network that allows the receiving units to communicate with a central processor; receiving a target signal from the target at... | 12/07/2010 |
| 7830308 | Apparatus for multilateration and method To cater for the positioning of an aircraft in a boundary zone between two adjacent multilateration systems, the controller (14) in one system receives Time Difference of Arrival data provided by the controller (15) in the second system. The controller... | 11/09/2010 |
| 7830309 | Location system A portable location device for use in a location system, the device comprising a transmitter for transmitting ultra-wideband signals, a receiver for receiving non-ultra-wideband signals and a control unit coupled to the receiver for controlling the operation of the ... | 11/09/2010 |
| 7821458 | Apparatus and method for locating a terminal in a broadband wireless communication system An apparatus and method for locating a terminal in a broadband wireless communication system are provided. The apparatus for locating the terminal includes a candidate region determiner, a virtual location determiner, and a final location determiner. The candidate r... | 10/26/2010 |
| 7800541 | Methods and systems for determining the location of an electronic device Embodiments of the present invention include a method of determining a location of a mobile device. The method comprises transmitting a signal between a plurality of known locations and receiving signal at device of unknown location such as a mobile device. The sign... | 09/21/2010 |
| 7777676 | Method of lightning location using time difference of arrival technology with auto correlation There is disclosed a system for identifying a source location of an electromagnetic signal having a known waveform. Radio receiving equipment located at three of more monitoring stations receives and demodulates a radio frequency signal from a common source. A time ... | 08/17/2010 |
| 7746275 | Position detecting system and position detecting server A position detecting system includes an RFID terminal configured to transmit an identification information signal by radio; a plurality of receiving devices configured to receive the identification information signal; and a position detecting server configured to re... | 06/29/2010 |
| 7710322 | Extensible object location system and method using multiple references An ultra wideband (UWB) or short-pulse RF system is disclosed that can be used to precisely locate or track objects (such as personnel, equipment, assets, etc.) in real-time in an arbitrarily large, physically connected or disconnected, multipath and/or noisy enviro... | 05/04/2010 |
| 7667649 | Detection of time of arrival of CDMA signals in a wireless location system In a Wireless Location System (WLS) deployed in connection with a CDMA-based wireless communications system, Location Measurement Units are used to collect multi-path corrupted radio signaling for use in time difference of arrival (TDOA) and hybrid positioning metho... | 02/23/2010 |
| 7636062 | Location device and system using UWB and non-UWB signals A portable location device for use in a location system, the device comprising a transmitter for transmitting ultra-wideband signals, a receiver for receiving non-ultra-wideband signals and a control unit coupled to the receiver for controlling the operation of the ... | 12/22/2009 |
| 7626546 | Methods and systems for detection and location of multiple emitters Systems and methods for detection and geolocation of multiple emitters that are emitting RF signal energy on a common frequency, and that may be implemented to separate, geolocate, and/or determine the number of emitters (e.g., radio users) emitting on a common RF f... | 12/01/2009 |
| 7612717 | ULB location system for rescuing avalanche victims A method for locating a UWB transmitter, without a previously-set reference, using at least one first set of at least three UWB searching transceivers, including first, second, and third transceivers. The method a) synchronizes the three UWB searching transceivers, ... | 11/03/2009 |
| 7598911 | Method and system for positioning mobile units based on angle measurements A method and system for positioning mobile units using angle measurements taken by neighboring mobile units is disclosed. A selected mobile unit and mobile units in the vicinity of the selected mobile unit are selectively instructed to measure and report information... | 10/06/2009 |
| 7576695 | Multilateration enhancements for noise and operations management Multilateration techniques are used to provide accurate aircraft tracking data for aircraft on the ground and in the vicinity of an airport. From this data, aircraft noise and operations management may be enhanced. Aircraft noise may be calculated virtually using tr... | 08/18/2009 |
| 7561105 | Emitter locating using time-difference-of-arrival (TDOA) techniques The present invention provides a method of selecting receiving pairs from a set of at least three receivers that may be used to localize an emitter. This involves identifying the set of at least three receivers to be used to localize the emitter. An isochron may be ... | 07/14/2009 |
| 7557754 | Method for use in a multilateration system and a multilateration system Groupings of receivers for determining a target location by a multilateration system are selected to give the best geometric dilution of precision result by eliminating the receiver that makes the greatest contribution to such dilution. In this way the groups to be ... | 07/07/2009 |
| 7551138 | Method and apparatus for signal tracking utilizing universal algorithm A method and apparatus for signal tracking utilizing a universal algorithm is disclosed. The method and apparatus generally include acquiring a signal measurement corresponding to a signal, forming a measurement matrix utilizing the acquired signal measurement, and ... | 06/23/2009 |
| 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 sensor mounted on a second platform for sampling a second portion of ... | 06/23/2009 |
| 7545326 | Wireless tracking system and method with multipath error mitigation A system (50) and method (300) for providing multipath error mitigation for real-time wireless tracking of an object (100) is disclosed herein. A plurality of sensor readings are obtained from a tag (60) attached to an object (100)... | 06/09/2009 |
| 7541978 | Antenna-assisted two-point positioning system An antenna-assisted two-point positioning system for positioning a mobile device is disclosed. The antenna-assisted two-point positioning system comprises a first wireless communication module comprising first antennas, a second wireless communication module compris... | 06/02/2009 |
| 7535420 | Method and apparatus for signal tracking utilizing universal algorithm Embodiments of the present invention provide a method and apparatus for signal tracking utilizing a universal algorithm. The method and apparatus generally include acquiring a signal measurement corresponding to a signal emitted from an emitter, forming a measuremen... | 05/19/2009 |
| 7515105 | Method for mapping machine rooms and locating machines within machine rooms A system and method automatically maps computer center rooms and locates data center components within computer centers. Radio triangulation is used to determine the locations and, optionally, orientation, of machines within a computer center. ... | 04/07/2009 |
| 7498986 | Methods and systems for locating actuators for improvised explosive devices A method for determining the location of an actuating device is described. The method includes receiving transmissions from the actuator utilizing a plurality of multiple channel receiving devices, determining a direction to the actuator based on the signals receive... | 03/03/2009 |
| 7492316 | Wireless time reference system and method Instead of normalizing time reference of independent spatially-located clocks using a reference tag transmission from known location, the present invention uses an interarrival time interval between a pulse pair of UWB pulses as a timing metric. Thus, a method of sy... | 02/17/2009 |
| 7471245 | Method and apparatus for estimating geolocations Methods and apparatus operable to estimate the geolocation of a signal emitter. In some embodiments, the methods comprise acquiring collection data from a plurality of collector elements, computing a plurality of candidate geolocations from the acquired collection d... | 12/30/2008 |
| 7463195 | Position location using global positioning signals augmented by broadcast television signals A method, apparatus, and computer-readable media for determining the position of a user terminal comprises receiving at the user terminal a broadcast television signal from a television signal transmitter; determining a first pseudo-range between the user terminal a... | 12/09/2008 |
