Method and apparatus for locating the source of an unknown...

Communications: directive radio wave systems and devices (e.g. – Directive – Position indicating

Reexamination Certificate

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C342S357400

Reexamination Certificate

active

08081111

ABSTRACT:
A method of locating the source of an unknown signal is provided that includes calculating a differential offset for a signal for each of a plurality of positions within a region in which the transmitter must lie, for each of a series of times m with respect to first and second signal relays and respective first and second receivers, the positions of the signal relays and receivers being known, generating a cross-ambiguity function (CAF) using data corresponding to samples of the unknown signal received at the first and second receivers via the first and second signal relays respectively, estimating the level of noise in the CAF, and using this data to obtain a measure of the likelihood that the source is located within defined areas within the region, where the differential offsets are differential time offsets, or differential frequency offsets, or both. The method provides location which is unconditionally convergent.

REFERENCES:
patent: 6018312 (2000-01-01), Haworth
patent: 6618009 (2002-06-01), Griffin et al.
Griffin C et al: “Interferometric radio-frequency emitter location” IEE Proceedings: Radar, Sonar & Navigation, Institution of Electrical Engineers, GB, vol. 149, No. 3, Jun. 3, 2002, p. 153-160, XP006018390.

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