Estimating Whether Or Not A Wireless Terminal Is In A Zone Using Radio Navigation
First Claim
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1. A method comprising:
- generating a computer-executable program based on a database that comprises;
(i) an expected value of a electromagnetic trait of a first signal in said first location, and(ii) an expected value of said electromagnetic trait of a second signal in a second location; and
transmitting said computer-executable program to said wireless terminal for execution on said wireless terminal;
wherein said computer-executable program estimates whether or not said wireless terminal is present in a zone is based on a measured value of said electromagnetic trait of said first signal; and
wherein said zone comprises said first location and said second location.
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Abstract
A method for estimating whether or not a wireless terminal is in a zone is described. The method is based on the following observation: when a wireless terminal is at a particular location, the values of the traits of the ambient electromagnetic signals that vary with location represent a “fingerprint” or “signature” for that location. This enables the location of a wireless terminal to be estimated by comparing the observed values of the traits of the ambient electromagnetic signals with the fingerprint for each potential location for the wireless terminal.
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Citations
14 Claims
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1. A method comprising:
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generating a computer-executable program based on a database that comprises; (i) an expected value of a electromagnetic trait of a first signal in said first location, and (ii) an expected value of said electromagnetic trait of a second signal in a second location; and transmitting said computer-executable program to said wireless terminal for execution on said wireless terminal; wherein said computer-executable program estimates whether or not said wireless terminal is present in a zone is based on a measured value of said electromagnetic trait of said first signal; and wherein said zone comprises said first location and said second location. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method comprising:
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generating a computer-executable program based on a database that comprises; (i) an expected value of a electromagnetic trait of a first signal in said first location, (ii) an expected value of said electromagnetic trait of a second signal in said first location; and transmitting said computer-executable program to said wireless terminal for execution on said wireless terminal; wherein said computer-executable program estimates whether or not said wireless terminal is present in said first location is based on; (i) a measured value of said electromagnetic trait of said first signal, (ii) a measured value of said electromagnetic trait of said second signal, and (iii) the difference between said measured value of said electromagnetic trait of said first signal and said measured value of said electromagnetic trait of said second signal. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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Specification