Sequence-based positioning technique

Details Sequence-based positioning technique Sequence-based positioning technique

2008-03-25

2008-03-25

Nguyen, Duc M. (Department: 2617)

Telecommunications

Radiotelephone system

Emergency or alarm communication

C455S456100, C455S440000

Reexamination Certificate

active

10999191

ABSTRACT:
A target device's location is estimated by a location estimation module (LEM) that comprises a probabilistic model (PM) for a plurality of sample points, each of which comprises a sample location and an expected distribution of signal values at that sample point. The location estimation module (LEM) makes a sequence (OS) of observations on, n=1, 2, 3 . . . , of signal values. Each observation corresponds to a respective location qnalong the target device's path. The sequence of observations and the respective location constitute a hidden Markov model. The module estimates the target device's location qnbased on the probabilistic model (PM) and the sequence of observations, wherein the sequence of observations comprises one or more future observations on+mfor which m is a positive integer. In other words, the target device's location is estimated, at least partially, based on knowledge of its future.

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Mark, Brian L. et al., “Robust Mobility Tracking for Cellular Networks,” IEEE International Conference on Communications, p. 445-449, ( 2002).

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