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| Application No. | Application Title | Issue Date |
| 20100321244 | TRACKING OF EMERGENCY PERSONNEL Techniques are disclosed that allow for the detection, identification, direction finding, and geolocation of emergency personnel in a given multipath environment. For example, the techniques can be used to detect and identify multiple lines of bearing (LOBs) to an IEEE ... | 12/23/2010 |
| 20090243934 | 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 synchr... | 10/01/2009 |
| 20090219211 | Method and apparatus for locating the source of radio frequency emissions At least two receiver sets are provided. A data processor is in communication with the receiver sets, wherein the data processor tags position data and radio frequency emission data from the receiver sets. A data storage unit is in communication with the data processor ... | 09/03/2009 |
| 20090140925 | 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 track ... | 06/04/2009 |
| 20090079633 | CALIBRATION OF A LOCATION SYSTEM A location system comprising a plurality of base units for enabling the locating of a device by means of one or more location signals communicated between the device and the base units and signal processing equipment for: i. determining the location of the device in dep... | 03/26/2009 |
| 20080238777 | SYSTEM AND METHOD FOR ENHANCIN THE ACCURACY OF A LOCATION ESTIMATE A method for enabling a system to enhance the accuracy of a location estimate modifies weights in a weight matrix associated with receiver station measurements in parallel with successive refinements of the location estimate. In a typical location estimation scenario, s... | 10/02/2008 |
| 20080231511 | Beacon-Assisted Precision Location of Untethered Client in Packet Networks A novel beacon-based position location technique for efficient location discovery of untethered clients in packet networks is disclosed. The position location technique utilizes the time-difference-of-arrival (“TDOA”) of a first signal transmitted by a beacon of kno... | 09/25/2008 |
| 20080204322 | Determining Positional Information Apparatus for determining positional information relating to an object, comprising: means for receiving, comprising a plurality of receiving elements; detection means for detecting signals received at the receiving elements and for generating output signals representati... | 08/28/2008 |
| 20080186235 | Multiplatform TDOA correlation interferometer geolocation A radio geolocation system is described in which a plurality of moving platforms such as aircraft concurrently receive a signal from a remote transmitter and the geolocation of the transmitter is determined. At each platform every thirty seconds a plurality of samples o... | 08/07/2008 |
| 20080129601 | Method for use in a multilateration system and a multilateration system Groupings of receivers to be used for determining a target location by a multilateration system are selected to give the best Geometric Dilution of Precision result by eliminating that receiver that makes the greatest contribution. In this way the groups to be used may ... | 06/05/2008 |
| 20080129600 | 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 received, a... | 06/05/2008 |
| 20080068267 | Cost effective communication infrastructure for location sensing A system for tracking persons in a structure, using a mobile unit for transmitting a distinctive beacon signal to a wireless array network of RF transceivers when the signal is within a predetermined distance of one or more RF transceivers, and transmitting the received... | 03/20/2008 |
| 20080068265 | PERFORMANCE AND POWER MANAGEMENT IN DIRECTION OF ARRIVAL DETERMINATION BY UTILIZING SENSOR INFORMATION A system for enhancing the performance of a wireless communication device (WCD) while executing a direction of arrival (DoA) estimation. The performance may be improved through device management, and may include the collection of information from one or more sensors ins... | 03/20/2008 |
| 20080042902 | 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 ( 02/21/2008 | |
| 20070247368 | 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 eac... | 10/25/2007 |
| 20070241965 | Location and tracking of people with combined use of RF infrascture and dead reckoning modules A system for tracking persons and other assets in a structure, having a multi-function tracking tag and a network of fixed RF receivers forming a gateway array. The location of the person being tracked is calculated by a computer using an algorithm that weights each sep... | 10/18/2007 |
| 20070236389 | 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 encod... | 10/11/2007 |
| 20070216576 | Ultrasonic Football Linesman A portable system for measuring and positioning a football on the playfield is revealed. The system measures ultrasonic sound wave propagation delay and relates it to yardage. It corrects for wind errors by sending ultrasonic waves in both directions on the playfield an... | 09/20/2007 |
| 20070216577 | 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:
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| 20070176826 | 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, arra... | 08/02/2007 |
| 20070146198 | Method and apparatus for detecting emitter movement A method and apparatus for detecting emitter movement. The method and apparatus generally include acquiring a measured signal characteristic corresponding to a signal emitted from an emitter, estimating a signal characteristic corresponding to the signal, and comparing ... | 06/28/2007 |
| 20070120738 | 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 electromagnetic radiation sensor antennas that are co-located on a single sensin... | 05/31/2007 |
| 20070115176 | Land-based local ranging signal methods and systems To provide sub-meter accuracy in a local positioning system, ranging signals with a high modulation rate of code, such as 30 MHz, or more are transmitted. Code phase measurements may be used to obtain the accuracy without requiring relative motion or real time kinematic... | 05/24/2007 |
| 20070090995 | System and method for position detection of a terminal in a network In a position detection system for detecting a position of a terminal apparatus of a radio communications system, a position detection time is shortened using a position detection method for determining signal times-of-arrival between the terminal apparatus and base sta... | 04/26/2007 |
| 20070001903 | 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 timing from pseudo SATNAV signals, additional GEO timing for non SATNAV appl... | 01/04/2007 |
| 20060273960 | 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 deve... | 12/07/2006 |
| 20060244661 | 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 receivers, from a transmitter, a first continuous-time signal having a first chan... | 11/02/2006 |
| 20060227043 | Passive geostationary satellite position determination Systems and methods for accurately determining the position of a satellite such as, for example, a geostationary satellite. In one embodiment, a satellite position determination system (10) includes an uplink station (20), a transceiver (50) onboard... | 10/12/2006 |
| 20060187119 | 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 constituent frequencies of the signals received at the two or more receiving site... | 08/24/2006 |
| 20060166681 | Method and apparatus for position sensing Embodiments of the present invention include one or more wireless transmitting devices and an array of receiver units for receiving wireless communications from the transmitting devices. The transmitter devices and receiver units can be arranged in one, two or three dim... | 07/27/2006 |
| 20060145922 | Tracking system utilizing antenna multiplexing A wireless tracking system that uses antenna multiplexing. According to the invention, a system for tracking an object includes at least one transmitter, a plurality of receiver stations, and at least one processor. The transmitter is carried on or embedded within the o... | 07/06/2006 |
| 20060125695 | System and method for enhancing the accuracy of a location estimate A method for enabling a system to enhance the accuracy of a location estimate modifies weights in a weight matrix associated with receiver station measurements in parallel with successive refinements of the location estimate. In a typical location estimation scenario, s... | 06/15/2006 |
| 20060125693 | Determining a position of at least one beacon in a location system A position for a beacon in a location system is determined based on distances measured from positions in a local coordinate system for the location system and from intersection points of circles. The circles each have a center point of one of the positions in the local ... | 06/15/2006 |
| 20060066486 | Radio signal transmitter with multiple antennas for improved position detection A radio frequency (RF) signal transmission device (the “device”) is used as a tracked target in a position tracking system (the “system”). In the preferred embodiments, the device's position is determined by analyzing the time difference of arrival of the device... | 03/30/2006 |
| 20060066485 | Wireless tracking system based upon phase differences A system and method of obtaining high accuracy position information relating to one or more mobile transmitters within a wireless tracking system relies upon phase differences for the time difference of arrival measurements of the transmitter(s). One or more transmitter... | 03/30/2006 |
| 20060033662 | 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 devi... | 02/16/2006 |
| 20060033660 | 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 method, with diminishing errors, error correction and which takes advantage o... | 02/16/2006 |
| 20050285793 | Self-calibrated path loss position estimation and zone of impact determination A device and method are provided for estimating a position of a target device (e.g., a device emitting radio frequency energy) based on data pertaining to strength of an emission received from the target device. At a mobile device, emissions are received from the target... | 12/29/2005 |
| 20050285792 | System and method for locating radio emitters using self-calibrated path loss computation Techniques for reducing the complexity and improving the accuracy of receive signal strength based location systems. The system comprises a plurality of radio sensor devices placed at known positions within a space in which devices are to be located. According to one te... | 12/29/2005 |
| 20050280578 | Location system and method that achieves time synchronized network performance using unsynchronized receiver clocks A system for locating an object within a monitored environment includes a tag transmitter that transmits an RF signal to receivers having unsynchronized clocks. A processor is operative with each receiver and determines clock timing relationships for the clocks based on... | 12/22/2005 |
