Location estimation of wireless terminals based on combinations of signal strength measurements and geometry-of-arrival measurements
First Claim
1. A method comprising:
- receiving (i) a first signal measurement for a first signal as received by a wireless terminal, and (ii) a second signal measurement for a second signal as transmitted by said wireless terminal; and
estimating the location of said wireless terminal based on said first signal measurement and said second signal measurement.
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Accused Products
Abstract
A method and apparatus for estimating the location of a wireless terminal are disclosed. The location of the wireless terminal is estimated based on one or more signal strength measurements in conjunction with: (i) one or more angle-of-arrival measurements, (ii) one or more time-of-arrival measurements, or (iii) a combination of (i) and (ii). At each measurement time, the illustrative embodiment (a) determines the candidate locations for the wireless terminal, (b) computes a measurement likelihood function for any signal strength measurements that are available at that time, (c) computes a measurement likelihood function for any geometry-of-arrival measurements that are available at that time, (d) computes a joint likelihood function for all measurements available at that time, and (e) updates the location probability distribution for the wireless terminal with the joint measurement likelihood function. Estimates of the location of the wireless terminal are obtained from the location probability distribution.
83 Citations
42 Claims
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1. A method comprising:
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receiving (i) a first signal measurement for a first signal as received by a wireless terminal, and (ii) a second signal measurement for a second signal as transmitted by said wireless terminal; and
estimating the location of said wireless terminal based on said first signal measurement and said second signal measurement. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A method comprising:
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receiving (i) a signal strength measurement for a first signal as received by a wireless terminal, and (ii) a time-of-arrival measurement for a second signal as received by said wireless terminal; and
estimating the location of said wireless terminal based on said signal strength measurement and said time-of-arrival measurement. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29)
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30. A method comprising:
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receiving (i) a signal strength measurement for a first signal as received by a wireless terminal, (ii) a first time-of-arrival measurement for a second signal as received by said wireless terminal, wherein said second signal is transmitted by a first Earth satellite, and (iii) a second time-of-arrival measurement for a third signal as received by said wireless terminal, wherein said third signal is transmitted by a second Earth satellite; and
estimating the location of said wireless terminal based on said signal strength measurement, said first time-of-arrival measurement, and said second time-of-arrival measurement. - View Dependent Claims (31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42)
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Specification