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The Study of Adaptive Beamforming Detection Performance on ALPA (Alaskan Long-Period Array) Interfering Events
TEXAS INSTRUMENTS INC DALLAS EQUIPMENT GROUP
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The report presents the results obtained from applying a time-domain maximum likelihood adaptive-beamforming processor to simulated mixed-event data from the Alaskan Long-Period Array. Adaptive-beamforming detection threshold reduction with respect to the beamsteer threshold is investigated as two parameters are varied the time separation between Rayleigh-wave arrivals, and the azimuthal separation between the events. In the simulation performed for this report, the arrival time of a signal buried in a stronger off-azimuth interfering event has little effect on the 11 dB ABF threshold reduction obtained, but the threshold reduction is strongly dependent on the azimuthal separation between the events.
APPROVED FOR PUBLIC RELEASE