Patent
location and tracking system
Martin Klepal,Widyawan,Dirk Pesch +2 more
- 18 Mar 2010
42
TL;DR: In this paper, a location and tracking system consisting of a site survey tool, a location engine, a self-calibration engine, and a fingerprint database is presented, which is used to estimate the position of a mobile node according to the current fingerprint, in turn giving rise to fresh updated fingerprints for future tracking.
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Abstract: A location and tracking system (1) comprises a site survey tool (2), a location engine (3), a self-calibration engine (4), and a fingerprint database (5) The system (1) operates for a wireless network of access points in a building and it generates from initialization data a model of the physical environment The model may for example be in the form of data representing geometry of lines in plan and signal attenuation values for the lines The system then uses this model to generate a fingerprint of projected signal strengths in the environment The system may maintains a fingerprint for every environment model or there may be only one model at any one time, or there may be a number Where the latter, the system may assign a weighting to each model to indicate its confidence value Upon detection of a mobile node in the environment the system (1) estimates position of the node according to the current fingerprint, and in real-time performs self-calibration of the environment model, in turn giving rise to fresh updated fingerprints for future tracking This continuous self-calibration ensures excellent tracking accuracy even with modification of the environment, such as changing of an access point configuration, moving a partition wall, or movement of a metal filing cabinet
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TL;DR: In this article, the location of a mobile unit (MU) in a wireless communication system and presenting it to a remote party is determined by comparing a snapshot of a predefined portion of the radio-frequency (RF) spectrum taken by the MU to a reference database containing multiple snapshots taken at various locations.
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TL;DR: In this article, a location system for locating and determining the motion and velocity of a wireless device is proposed, which is trained according to a sparse set of identified locations from which signal strengths are measured.
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Theodore S. Rappaport,Roger R. Skidmore,Veeraraghavan A. Anantha,Eric S. Reifsnider +3 more
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TL;DR: In this paper, a system and method for estimating the position of wireless devices within a wireless communication network combines measured RF channel characteristics for the wireless device with one or more predicted performance lookup tables, each of which correlates an RF channel characteristic to some higher order network performance metric and/or a position within an environmental model.
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Wireless position location and tracking system
Derek Smith,James D. Adams,Nicolas C. Nierenberg,Joseph C. Baker +3 more
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TL;DR: In this paper, the authors describe a system for accurate position location and tracking suitable for a wide range of facilities in variable environments, where a position engine comprises a mapped space of a physical environment, and a processor for updating the mapped space in response to received measurements.
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Wireless position determination using adjusted round trip time measurements
Alok Aggarwal,Ayman Fawzy Naguib,Vinay Sridhara,Saumitra Mohan Das +3 more
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TL;DR: In this paper, the authors proposed a method for wirelessly determining a position of a mobile station by measuring a round trip time (RTT) to a plurality of wireless access points, estimating a first distance to each wireless access point based upon the RTT delay and an initial processing time associated with each access point, and combining the first and second distance estimates, and calculating the position based on the combined distance estimates.
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