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| Number | Title | Issue Date |
| 8111193 | Distance estimation The invention relates to an apparatus and method for estimating the distance between a transmitter and a receiver. A method comprising obtaining a signal from a receiver; determining whether the signal more likely propagated through a line-of-sight (LOS) radio chann... | 02/07/2012 |
| 8102316 | System and method for tracking lost subjects A method for monitoring and tracking the position of a subject comprises, in an exemplary embodiment, the steps of embedding a transponder into an article to be worn by the subject and installing software in a GPS-enabled receiver, such as a cell phone or the like, ... | 01/24/2012 |
| 8063825 | Cooperative position location via wireless data link using broadcast digital transmissions A cooperative position location device (CPLD) that integrates a broadcast digital transmission (BDT) receiver, a data link transceiver, and a displacement sensor; a computer program product tangibly stored in computer-readable media; and associated methods for recei... | 11/22/2011 |
| 8031121 | Apparatus for position detection using multiple antennas An apparatus includes a transmitter and a receiver device, which includes a receiver section and a processing module. The transmitter transmits a high carrier frequency signal. The receiver section includes first and second antennas that have an antenna radiation re... | 10/04/2011 |
| 8022877 | Systems and methods for using a satellite positioning system to detect moved WLAN access points The disclosed subject matter generally relates to hybrid positioning systems and methods and, more specifically, systems and methods of detecting moved WLAN assess points using a wireless local area network based positioning system (WLAN-PS) and a satellite-based po... | 09/20/2011 |
| 7999740 | Methods and systems for fast ranging in wireless communication networks A method for efficiently performing ranging in a wireless communication network may be implemented by a mobile station. The method may include sending a ranging code to a base station. The method may also include receiving a ranging response message from the base st... | 08/16/2011 |
| 7994982 | Method and apparatus for bounded time delay estimation A method and apparatus for estimating the position of a mobile device in a multi-path environment. In one example, the method includes receiving a plurality of reference signals from a corresponding plurality of reference devices, for each reference signal, calculat... | 08/09/2011 |
| 7880676 | Method and system for hybrid positioning using partial distance information The present invention provides a method and system for positioning one or more anchor nodes or one or more non-anchor nodes in one or more communication networks. A non-anchor node may be in communication with two or more anchor nodes. The method comprises determini... | 02/01/2011 |
| 7855683 | Methods and apparatuses for GPS coordinates extrapolation when GPS signals are not available Systems and methods for extrapolating GPS coordinates beyond line of sight are disclosed. A coordinate extrapolation system (CES) can include a memory, a processor, and a GPS receiver. The CES can receive GPS signals and determine GPS coordinates corresponding to a ... | 12/21/2010 |
| 7839325 | Positioning device and method for measuring the distance between multiple positioning devices A positioning device includes an antenna, a receiving module, a processing module and an output module. The receiving module receives positioning signals transmitted from positioning satellites and a position signal of another positioning device transmitted from a g... | 11/23/2010 |
| 7791535 | Positioning device and method for measuring the distance between multiple positioning devices A positioning device includes an antenna, a receiving module, a processing module and an output module. The receiving module receives positioning signals transmitted by positioning satellites and a position signal of another positioning device using the antenna. The... | 09/07/2010 |
| 7786936 | Position information detection system and position information detection method An object of the present invention is to achieve a position information detection system with high precision when an obstruction and a reflective object exist. A position information detection system includes a reader/writer whose position is known, a first RF chip ... | 08/31/2010 |
| 7710321 | Ranging signals methods and systems 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 prior estimate. The subsequent estimate allows estimate uncertainties ... | 05/04/2010 |
| 7692587 | Rapid acquisition and correlation of synchronization codes for mobile devices with limited memory and computational power The present invention provides a method, system, and apparatus for rapidly acquiring and correlating synchronization codes for a mobile receiver used for position determination purposes. The receiver uses a processing unit to perform the correlation functions. The p... | 04/06/2010 |
| 7683835 | System and method for locating wireless devices A system and method for locating a wireless device includes estimating respective distances between a wireless device and each of a plurality of access points, based upon respective signal strengths of a plurality of signals received by the wireless device from the ... | 03/23/2010 |
| 7656352 | Troposphere corrections for ground based positioning systems Troposphere corrections are provided in a land based transmitter-positioning system. Troposphere delays correct ranges based on X- or ISM-band carrier ranging signals with a modulation rate of the code of at least about 30 MHz. Ground based transmitters transmit non... | 02/02/2010 |
| 7639182 | Distance measurement in a radio communication device A radio communication arrangement including a plurality of transceivers and a distance measurement managing circuit. The distance measurement managing circuit is situated in a communication layer higher than the physical layer, is coupled with the plurality of trans... | 12/29/2009 |
| 7595755 | Distance estimation A method for estimating the distance between a transmitter and a receiver, the transmitter being arranged to transmit a signal as a series of bursts, and the carrier frequency of each burst being set according to a predetermined sequence, the method comprising: form... | 09/29/2009 |
| 7592956 | Wireless transmitter location determining system and related methods A location determining system for a wireless transmitter is carried by a platform movable relative to the wireless transmitter. The location determining system may include an antenna, and a receiver coupled to the antenna. The location determining system may also in... | 09/22/2009 |
| 7570213 | Method and apparatus for detecting and locating intrusion in a wireless network Method and apparatus for locating an intruding radio frequency signal in a wireless network. Relative distance measurements are computed between pairs of receivers from a plurality of receivers to the source of the intruding signal based on received signal strength.... | 08/04/2009 |
| 7528776 | 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... | 05/05/2009 |
| 7515103 | Measuring distance using wireless communication A method of estimating the distance between a first wireless communication terminal and a second wireless communication terminal includes: receiving a signal at the first terminal, processing the received signal including performing a demodulation operation to produ... | 04/07/2009 |
| 7495614 | System and method for multipath mitigation using clustered positioning signals A diversity system for positioning systems is disclosed, whereby a plurality of positioning signals, which are transmitted and/or are received from substantially the same location, are received and interpreted by an observing receiver. The observing receiver is conf... | 02/24/2009 |
| 7463194 | Method for reducing radio ranging errors due to clock frequency offsets A method reduces errors in two-way ranging between transceivers due to a frequency offset. A first transceiver measures a time CA1 between transmitting a request frame and receiving a reply frame, and a time CA2 between receiving a first inform... | 12/09/2008 |
| 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 prior estimate. The subsequent estimate allows estimate uncertainties ... | 11/11/2008 |
| 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 uses the reception time determining apparatus. There is provid... | 10/28/2008 |
| 7389114 | Estimating the location of inexpensive wireless terminals by using signal strength measurements A system is disclosed that enables the estimation of the location of a wireless terminal in a wireless network. The illustrative embodiment works without requiring modifications to be made to the wireless terminal. Furthermore, the hardware of some embodiments of th... | 06/17/2008 |
| 7383053 | Position estimation of transceivers in communication networks This invention provides a system and method using wireless communication interfaces coupled with statistical processing of time-of-flight data to locate by position estimation unknown wireless receivers. Such an invention can be applied in sensor network application... | 06/03/2008 |
| 7372405 | Position location using digital video broadcast television signals Apparatus to determine the position of a user terminal, the apparatus having corresponding methods and computer-readable media, comprises a receiver to receive, at the user terminal, a wireless orthogonal frequency-division multiplexing (OFDM) signal comprising a sc... | 05/13/2008 |
| 7369941 | Collision detection system and method of estimating target crossing location A collision detection system and method of estimating a crossing location are provided. The system includes a first sensor for sensing an object in a field of view and sensing a first range defined as the distance between the object and the first sensor. The system ... | 05/06/2008 |
| 7362270 | System and method to perform network node localization training using a mobile node A method and system for determining a location of at least one stationary node of a wireless network, which includes providing a predetermined path within a geographic space of the wireless network, prior to localization, moving a mobile node along the predetermined... | 04/22/2008 |
| 7362801 | Method for accurate estimation of noise for data modems Noise and signal-to-noise ratio (SNR) estimation are relatively straightforward tasks. However, when SNR is small, systematic errors in measurement may result in over-estimation of SNR, which also occurs during runtime monitoring of SNR. Here, sufficient numbers of ... | 04/22/2008 |
| 7359038 | Passive determination of ground target location Ground targets can be passively identified on uneven terrain from an observation point elevation above a known reference point, a line-of-sight inclination angle, an azimuth angle and a digital terrain elevation database wherein actual elevations of surrounding lati... | 04/15/2008 |
| 7358899 | Distance estimation in a communication system The present invention relates to estimation of the distance between stations that communicate in a communication system over a radio interface. In the system at least one of the stations transmits signal bursts in time slots in accordance with a timing structure and... | 04/15/2008 |
| 7339524 | Analog decorrelation of ranging signals In a local positioning system, a receiver is adapted for receiving signals from a land-based transmitter. The receiver includes an analog decorrelator for decorrelating the transmitted spread spectrum signals. A down converter connected with an antenna may be spaced... | 03/04/2008 |
| 7339526 | Synchronizing ranging signals in an asynchronous ranging or position system In a local positioning system, the land-based transmitters include free running oscillators or oscillators free of clock synchronization with any remote oscillator. A reference receiver receives the ranging signals from different transmitters and generates timing of... | 03/04/2008 |
| 7327306 | RF system for tracking objects A system for tracking an object in space for position, comprises a transponder device connectable to the object. The transponder device has one or several transponder aerial(s) and a transponder circuit connected to the transponder aerial for receiving an RF signal ... | 02/05/2008 |
| 7327314 | Two-way ranging between radio transceivers A method estimates a distance between transceivers in a wireless communications network. A first time interval T is set in a transmitter and a receiver. A signal is transmitted from the transmitter to the receiver at a time t2 according to a first clock o... | 02/05/2008 |
| 7321777 | Wireless communications system including a wireless device locator and related methods A wireless communications system may include a plurality of wireless communications devices and a wireless device locator. More particularly, the wireless device locator may include at least one antenna and a transceiver connected thereto, and a controller for coope... | 01/22/2008 |
| 7318206 | Offset determination for measurement system matching Dynamic offset determination for each of a plurality of measurement systems for matching the systems is disclosed. One embodiment uses an artifact which is periodically run across the measurement system to be matched. Inputs for each run include the current offsets ... | 01/08/2008 |
