Estimating location using multi-antenna radio receiver

Details Estimating location using multi-antenna radio receiver Estimating location using multi-antenna radio receiver

2008-05-16

2011-12-27

Edouard, Patrick (Department: 2617)

Telecommunications

Radiotelephone system

Zoned or cellular telephone system

C455S404200

Reexamination Certificate

active

08086248

ABSTRACT:
Packets are periodically transmitted by a plurality of radio beacons deployed at known positions over a location estimation area. Monitoring is conducted for incoming packets. Upon receipt of a packet from a kthone of the beacons, received signal strength, RSSI, is measured at each of the antenna outputs, the packet is decoded to obtain the unique identifier and the unique sequence number, and the received signal strength at each of the antenna outputs is spatially averaged. The measuring, decoding, and spatial averaging are repeated for additional packets from the kthone of the beacons during a pre-defined time window T. The plurality of spatially averaged received signal strengths are temporally averaged over the pre-defined time window T, to obtain a spatially and temporally averaged value of received signal strength. The distance dkfrom the apparatus to the kthone of the beacons is approximated based on the spatially and temporally averaged value of received signal strength. The approximate distance dkis designated as {circumflex over (d)}k. This is repeated for the K beacons that have successfully transmitted packet(s) during the pre-defined time window, k=1 to K. The location of the object is estimated as an approximate intersection of spheres with radii {circumflex over (d)}k. Each sphere is centered at the known position of the kthone of the beacons.

REFERENCES:
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Z. Xiang et al., “A wireless LAN-based indoor positioning technology”; IBM J. Res. & Dev. vol. 48 No. 5/6, Sep./Nov. 2004.
G. V. Zaruba, “Indoor location tracking using RSSI readings from a single Wi-Fi access point”; Wireless Netw (2007) 13:221-235; published online: Jun. 8, 2006; copy right Springer + Business Media, LLC 2007.
William S. Murphy, Jr. et al., “Determination of a Position in Three Dimensions Using Trilateration and Approximate Distances”, Nov. 28, 1999.

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