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Signal Comparison-Based Location Determining Method

  • US 20100159951A1
  • Filed: 03/09/2010
  • Published: 06/24/2010
  • Est. Priority Date: 09/19/2006
  • Status: Active Grant
First Claim
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1. A signal-comparison based location-determining method, operable by a first portable RF communications device in conjunction with at least two fixed location service-area antenna stations capable of RF communication with the device wherein the stations are substantially continuously operating, the method comprising the steps of:

  • (a) the first portable RF communications device monitoring its location by (i) receiving communications signals from a plurality of local fixed-location service-area antenna stations, (ii) identifying at least one ID within at least one of the received communications signals, and (iii) measuring a signal characteristic associated with the communications signals;

    (b) the first portable RF communication device determining if the monitored location is within proximity to a location chosen by a user of the first portable RF communication device, by electronically comparing a fingerprint of the monitored location with a fingerprint of the chosen location, wherein the fingerprint of a given location is a group of figures identifying the location which include at least one figure which is an ID within a communication signal received at the given location and at least one figure which is based on a characteristic of a signal received at the location.

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