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8183981 |
Passive tag with oscillator circuit and frequency identification system utilizing the same
A passive tag receiving a reader signal provided by a reader is disclosed. The passive tag includes an antenna, an oscillator circuit, and an internal chip. The antenna receives the reader signal....
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8169369 |
Method and device for generating a location signal
A frequency generation unit (FGU) in a communication device includes a voltage controlled oscillator (VCO), an adjustable filter having a capacitive element for wideband operation, a current source...
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8159397 |
System for determining position using two way time transfer signals
A system for enhancing location estimates by movable rovers including one or more base stations that engage in two way time transfer (TWTT) with the rovers. Each TWTT operation between a given base...
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8159396 |
Wireless proximity probe and method of operating same
A proximity probe, for use in determining a distance to a probe target, includes a first antenna configured to wirelessly receive a radio-frequency signal at a first predetermined frequency and a...
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8154454 |
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...
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8125389 |
Doppler-aided positioning, navigation, and timing using broadcast television signals
Methods having corresponding apparatus and tangible computer-readable media comprise: determining a plurality of first pseudoranges based on a plurality of respective wireless television signals...
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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...
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8106816 |
Method of determining the position of a mobile device
A set of device parameters consisting of clock bias and position of a mobile device is determined without previous knowledge of the week number (WN) in that solutions of a set of equations derived...
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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...
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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...
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8054226 |
Method for estimating location of nodes in wireless networks
A method localizes a set of nodes in a wireless network that includes a target node having unknown location and a set of anchor nodes having known locations. The set of anchor nodes is partitioned...
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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...
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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...
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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...
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7996020 |
Locating a WLAN station using signal propagation delay
A wireless network device including: a first RF transceiver module configured to (i) for a predetermined number of times, transmit a data frame to a second RF transceiver module, and (ii) for each...
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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...
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7978049 |
Time-of-flight ranging systems using coarse and fine measurements
A time-of-flight ranging system, such as a keyless access Control system, comprises a first part and a second part, e.g., a portable device such as a key fob. Both parts have a transceiver for...
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7974359 |
Methods and apparatus for mitigating multi-antenna correlation effect in communication systems
The disclosed embodiments provide for methods and systems for transmitting a number of streams of modulation symbols by a multi-antenna transmitter. In one aspect, a method for transmitting a...
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7969963 |
Method for estimating relative clock frequency offsets to improve radio ranging errors
A method and system improves two-way radio ranging accuracy by estimating a relative clock frequency offset between a first clock X of a first transceiver and a second clock Y a second transceiver....
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7941108 |
Method and system for automatically identifying wireless signal quality of a region
A method for automatically identifying wireless signal quality of a region includes receiving signal quality information associated with wireless signals received by each of a plurality of mobile...
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7898472 |
Method and apparatus for precise relative positioning in multiple vehicles
A system and method for determining the position and velocity of a plurality of vehicles relative to a host vehicle using GPS data. The method includes building a graph of the vehicles that define...
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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...
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7877101 |
Locating a WLAN station using signal propagation delay
A wireless network device comprises a first RF transceiver module and a control module. The first RF transceiver module transmits a first data frame to a second RF transceiver module and receives a...
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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...
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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...
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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...
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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...
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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...
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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...
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7768963 |
System and method of improving sampling of WLAN packet information to improve estimates of Doppler frequency of a WLAN positioning device
Systems and methods of improving sampling of WLAN packet information to improve estimates of Doppler frequency of a WLAN positioning device. A device estimates the position of itself. The device...
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7737893 |
Positioning in a single-frequency network
Apparatus having corresponding methods and computer-readable media comprise a receiver adapted to receive a plurality of single-frequency network (SFN) signals at a predetermined frequency; a...
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7720598 |
System and method for determining a position of a vehicle with compensation for noise or measurement error
A mobile transmitter transmits a transmission signal from a vehicle to beacons. An estimator determines elapsed times for corresponding propagation paths between the vehicle and the beacons. Each...
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7719994 |
Sub-frame synchronized ranging
A method of determining distances between communication nodes. The method includes transmitting an initial communication frame from a first node to at least one second node. The initial...
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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...
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7711375 |
Method and system for determining a location of a wireless transmitting device and guiding the search for the same
Method and system of determining a location of a wireless transmitting device, such as a cellular phone, a wireless PDA or a radio tag, and guiding the searching personnel to physically reach the...
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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...
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7688747 |
Sub-frame synchronized residual ranging
A method of ranging between nodes is provided. The method includes synchronizing two or more nodes with a frame preamble. Exchanging data and ranging schedule between the nodes without an...
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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...
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7676205 |
Active receiver detection and ranging
Method (500) and system (402) for actively detecting and determining a range of a remotely located radio receiver (100). The invention also provides a method and system to determine whether a...
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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...
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7646330 |
System and method for locating objects and communicating with the same
Communication between a remote locator and a transponder is used to determine the relative position of the transponder. The transponder and locator each include a transmitter and a receiver. The...
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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...
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7602339 |
Method and system for extensible position location
A method and system for extensible positioning that uses a primary reference node at a known first position and a secondary reference node at a second position, where a range is measured between...
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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...
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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...
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7579990 |
Method and system for estimating the location of a wireless terminal from a received signal strength
A first estimated location of a target terminal to be estimated in its location is obtained based on information derived from radio signals for location estimation and also locations of anchor...
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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...
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7564404 |
Determining precise direction and distance to a satellite radio beacon
The present invention discloses a device and method for precisely determining the direction and distance to a satellite radio beacon. In one embodiment, the disclosed device is used for SAR (search...
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7548517 |
Method and apparatus for determining the location of a node in a wireless system
A location technique is utilized where channel-model parameters are originally estimated prior to location taking place. Location then takes place using a first set of known-located nodes, and the...
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7545261 |
Passive method and apparatus for alerting a driver of a vehicle of a potential collision condition
The present invention discloses a vehicular collision alert system (100) which receives signals (104) from devices (102) commonly associated with vehicular use. The direction (308) of the received...
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