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| Number | Title | Issue Date |
| 7053829 | Method for determining a position with the aid of a radio signal having a rotating transmission characteristic A method determines the position of a mobile object by using at least one radio signal having a rotating transmission characteristic with at least one reference station. The relation between the orientation of the transmission characteristic and reference events is ... | 05/30/2006 |
| 7042395 | Method of providing an estimate of a location A method of providing an estimate of the location of first and second devices MS1, MS2 comprising the steps of obtaining at least one range measurement from the first device MS1 to a known reference point BS1, GPS SVs; obtaining at least ... | 05/09/2006 |
| 7034656 | Method for identifying the position of a portable transponder, and an antitheft system A method for the recognition of the proximity of a portable transponder (20) to a base station (2), comprises the steps of: the base station transmits a first test signal with a defined power, the transponder determines the field strength with which it... | 04/25/2006 |
| 7030809 | Multiple model radar tracking filter and systems and methods employing same A multiple model (MM) radar tracking filter which controls the weighting applied to outputs of first and second model functions responsive to non-Markovian switching logic, includes the first and second model functions, switching logic receiving unweighted outputs f... | 04/18/2006 |
| 7026983 | Location data diffusion and location discovery A location discovery method using location data items that originate at known locations (X,Y) and are passed to, and diffused between, entities (A,B) by short-range communication. Each location data item received by an entity (A,B) indicates a maximum distance of th... | 04/11/2006 |
| 7023995 | Secure location-based services system and method A system and method for providing a location-based service from a third party service provider includes encrypting a client's identification information using a public key exchanged with a network location server, wherein the network location server stores a record ... | 04/04/2006 |
| 7023381 | Multi-frequency pseudolites for carrier-based differential-position determination Apparatus and methods for resolving integer ambiguities in position determination. An embodiment of the invention includes a reference system, augmented with multi-frequency pseudolites using a carrier phase differential GPS implementation, and a mobile system. In o... | 04/04/2006 |
| 7012547 | Electronic vehicle toll collection system and method A system for automatic collection of tolls includes an in-vehicle toll processor having memory for storing a toll-money-available quantity purchased by the user, and a toll-facility-identification site that transmits a toll-facility-identifier signal indicating the ... | 03/14/2006 |
| 7012271 | Electromagnetic radiation structure control system A control system is provided for controlling the shape of a flexible electromagnetic radiation structure. The control system includes a plurality of actuators and a plurality of computational elements. Each of the plurality of actuators is coupled to a portion of th... | 03/14/2006 |
| 7010262 | Techniques for circumventing jamming of global positioning system receivers A method and apparatus for circumventing jamming of receivers for a global positioning system (GPS) include determining that a receiver is being jammed by a jamming signal not originating from the GPS. A first signal is transmitted from a portable unit including the... | 03/07/2006 |
| 7006838 | System and method for locating sources of unknown wireless radio signals A system and method for determining the location of a source (target device) of a wireless radio signal of an unknown or arbitrary type for which a signal correlator is not known or available. The target device's signal is received at a plurality of known locations ... | 02/28/2006 |
| 7002510 | Method and apparatus for air-to-air aircraft ranging A method and apparatus is disclosed for determining the range between two planes, ownship (10) and target (12). Model data (66) estimating the velocity and position of target (12) is compared to actual flight path data of the target (1... | 02/21/2006 |
| 6975722 | Dual echo canceller with fast reflector identification An echo canceller, which includes, receives and sends paths connected to standard telecommunication interfaces, a non adaptive filter with filter reflection coefficients which generate an estimated echo signal, which when subtracted from the send path input produces... | 12/13/2005 |
| 6973316 | Position detecting method and apparatus A sufficiently great processing gain is obtained by employing a sufficiently long symbol duration for a measuring signal, whereby it is possible to obtain both an increased communicable distance of the measuring signal and a reduced interference amount. Therefore it... | 12/06/2005 |
| 6970132 | Targeted data transmission and location services using digital television signaling A method, apparatus, and computer-readable media comprise receiving a broadcast digital television signal comprising data relevant to one or more particular locations; generating a pseudorange based on the broadcast digital television signal; and determining locatio... | 11/29/2005 |
| 6963727 | Direct-path-signal detection apparatus and associated methods Direct-path-signal (DPS) detector circuitry includes a standard deviation calculator circuitry configured to determine a standard deviation of a plurality of data values within a data frame. The data frame corresponds to a radio-frequency signal received via a commu... | 11/08/2005 |
| 6961020 | Position location using broadcast analog television signals A computer program product, apparatus, and method for determining the position of a user terminal. It includes receiving, at the user terminal, a broadcast analog television signal having a periodic component; and correlating the broadcast analog television signal w... | 11/01/2005 |
| 6956527 | Wireless network access point configuration A wireless network having wireless network access devices may determine the location of newly added wireless network access devices. ... | 10/18/2005 |
| 6952181 | Locating a mobile station using a plurality of wireless networks and applications therefor A location is disclosed for wireless telecommunication infrastructures. The systems output requested locations of hand sets or mobile stations (MS) based on, e.g., AMPS, NAMPS, CDMA or TDMA communication standards. The system determines both local MS locations, and ... | 10/04/2005 |
| 6950058 | System, method, apparatus and means for providing GPS aiding data to networked receivers A system, method, apparatus, and means for providing GPS aiding data to networked receivers includes capturing partial aiding data at a network device, deriving accurate aiding data from the partial aiding data, and utilizing the accurate aiding data as aiding data.... | 09/27/2005 |
| 6944541 | Systems and methods for fault detection and exclusion in navigational systems The Fault Detection and Exclusion (FDE) system for use in navigational systems that rely upon multiple ranging signals, such as GPS satellites, uses an FDE algorithm to detect, as soon as possible, whether a fault exists in a signal associated with one or more of th... | 09/13/2005 |
| 6940994 | Passive power line detection system for aircraft A passive, real-time obstacle detection system is provided that determines the presence of small, curvilinear objects such as power lines. The system generally comprises a payload system having an infrared image detection system, a crew interface having a display fo... | 09/06/2005 |
| 6933889 | Direction and distance finder The present invention relates to a system and method for locating the direction and distance to a RF signal source, primarily for search and rescue. The system and method includes a RF signal locator and a graphical display residing on the signal locator. The receiv... | 08/23/2005 |
| 6930638 | Passive moving object detection system and method using signals transmitted by a mobile telephone station A passive object detection system (1) comprises first and second antennas (4, 6) and a processor (8). The first antenna (4) is adapted to receive a signal transmitted by a mobile telephone base station; the second antenna (6) is ad... | 08/16/2005 |
| 6925064 | Method and apparatus for discovering neighbors within a piconet communication system In order to discover neighboring nodes (203, 207, 208) within a particular piconet, a first node (206) determines a list of all nodes (205-207) within its piconet (201) and then transmits to each node within the piconet, a message requiri... | 08/02/2005 |
| 6922166 | System and method for distance measurement by inphase and quadrature signals in a radio system A system and a method for distance measurement utilizes a radio system. The distance is measured in coarse resolution, and in fine resolution that corresponds to distance attributes. The distance between first and second radio transceivers is determined from the coa... | 07/26/2005 |
| 6920330 | Apparatus and method for the use of position information in wireless applications Embodiments of the present invention are directed at gathering position information of mobile and stationary entities and using the position information in a wide variety of applications. Various embodiments use a plurality of signal transmitting devices and/or a pl... | 07/19/2005 |
| 6914560 | Position location using broadcast digital television signals comprising pseudonoise sequences A user terminal comprises a receiver adapted to receive, at the user terminal, a broadcast digital television signal transmitted by a television transmitter and comprising a pseudo-noise code; and a controller adapted to generate a pseudorange based on the pseudo-no... | 07/05/2005 |
| 6906625 | System and method for information assimilation and functionality control based on positioning information obtained by impulse radio techniques A system and method for information assimilation and functionality control based on positioning information obtained by impulse radio techniques, which utilizes the position information and communication abilities inherent in impulse radio technology to correlate po... | 06/14/2005 |
| 6882845 | Autonomous zone forming communication device and autonomous zone forming method An autonomous zone forming method of autonomously forming a zone which is a service area of a base station in a wireless communication system having the base station is provided. In the method, it is detected that a zone is newly formed around the base station, and ... | 04/19/2005 |
| 6879286 | Position location using ghost canceling reference 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 analog television signal comprising a chirp-type signal; and generating a pseudorange based on the chirp-type sign... | 04/12/2005 |
| 6876326 | Method and apparatus for high-accuracy position location using search mode ranging techniques A high accuracy search and tracking system that uses a round-trip messaging scheme in which the time of arrive (TOA) of ranging signals is accurately determined to yield the range estimates between a target communications device and one or more search communications... | 04/05/2005 |
| 6823190 | System and method to anonymously test for proximity of mobile users without revealing individual phase space coordinates Described is a way for computing proximity (location-based proximity or preference-based proximity) between mobile wireless subscribers (who use different services) without either divulging their location/preference to the other (preservation of privacy). Privacy is... | 11/23/2004 |
| 6810353 | Non-directional magnet field based proximity receiver with multiple warning and machine shutdown capability A hazardous area warning system with a non-directional magnetic field based proximity receiver for warning personnel of an attendant hazard. The receiver includes a x-axis receiver with an antenna directed in a x direction, a y-axis receiver with an antenna directed... | 10/26/2004 |
| 6806828 | Passive range and angle measurement system and method A method determines range from a moving platform to an emitter. The method receives a RF signal from the emitter; counts a number of phase reversals of the received RF signal during a period of time; measures a Doppler frequency during the period of time; and determ... | 10/19/2004 |
| 6774846 | System and method for position determination by impulse radio A system and a method for position determination by impulse radio using a first transceiver having a first clock providing a first reference signal and a second transceiver placed spaced from the first transceiver. The system determines the position of the second tr... | 08/10/2004 |
| 6756901 | Multi function electronic personal monitor and radio telemetry cell system A multi function personal alert safety cell system having condition responsive sensors and an alarm for emergency type personal. The personal alert safety cell system having a transceiver. The transceiver for transmitting and receiving at several different radiated ... | 06/29/2004 |
| 6748224 | Local positioning system A local positioning system (LPS) uses the radio propagation parameters in a CDMA forward link or TDMA reverse link to establish a mobile station's position. The mobile station receives pilot channel signals from at least three distinct base stations and records the ... | 06/08/2004 |
| 6741209 | Positioning system The invention provides a positional system intended to supplement positional information derived by means of a Global Positioning System (GPS), so as to provide positional data coverage in situations where the GPS data may be unreliable, for example due to local att... | 05/25/2004 |
| 6734823 | Method and system for mapping and tracking information from a plurality of remote stations A method of tracking changes in position of a plurality of remote stations, each having, the method comprising: (a) assigning a plurality of transmission slots to each of the remote stations; (b) determining, by the respective stations, of their positi... | 05/11/2004 |
