The Study of Adaptive Beamforming Detection Performance on ALPA (Alaskan Long-Period Array) Interfering Events.

摘要

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.