Accession Number:

ADA017380

Title:

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

Descriptive Note:

Technical rept.

Corporate Author:

TEXAS INSTRUMENTS INC DALLAS EQUIPMENT GROUP

Personal Author(s):

• Shen, Wen-Wu

Report Date:

1975-07-28

Pagination or Media Count:

36.0

Abstract:

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.

Descriptors:

• *SEISMIC DETECTION
• *UNDERGROUND EXPLOSIONS
• ALASKA
• AZIMUTH
• BEAM FORMING
• EARTHQUAKES
• NUCLEAR EXPLOSIONS
• RAYLEIGH WAVES
• SEISMIC ARRAYS
• SEISMOLOGICAL STATIONS
• SIMULATION
• TIME DOMAIN

Subject Categories:

• Seismology
• Seismic Detection and Detectors

Distribution Statement:

APPROVED FOR PUBLIC RELEASE