Method for gradient flow source localization and signal...

Details Method for gradient flow source localization and signal... Method for gradient flow source localization and signal...

2005-03-08

2005-03-08

Bui, Bryan (Department: 2863)

Data processing: measuring, calibrating, or testing

Measurement system in a specific environment

Earth science

C702S014000, C702S094000, C702S095000

Reexamination Certificate

active

06865490

ABSTRACT:
A method of separating and localizing sources of traveling waves, by obtaining linearly independent time-differentiated instantaneous observations of the sources, from spatial derivatives of the traveling wave acquired using a distributed sensor or a sensor array. The sources are blindly separated by direct application of (static) independent component analysis on the time-differentiated observations, yielding both the sources and their direction cosines relative to the sensor geometry. The method is suited for arrays of small aperture, with dimensions shorter than the coherence length of the waves. In one preferred embodiment, three sources are separated and localized from differential observations on four coplanar sensors positioned on the corners of a square. Applications include miniature microphone arrays for intelligent hearing aids with adaptive suppression of interfering signals and nonstationary noise, and integrated RF arrays for resolving or localizing multiple users or channels from a base station or mobile unit.

REFERENCES:
patent: 6185309 (2001-02-01), Attias
patent: 6512996 (2003-01-01), Praskovsky et al.
patent: 6670920 (2003-12-01), Herrick

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