Extended Array Evaluation Program. Special Report No. 2. Simulated On- Line Adaptive Processing Results Using Alaska Long Period Array Data
TEXAS INSTRUMENTS INC DALLAS EQUIPMENT GROUP
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The report deals with results obtained from operating an adaptive time-domain maximum-likelihood filtering system on data from the Alaska Long- Period Array ALPA. Signal-to-noise gain of adaptive filtering relative to beamsteering is investigated as a function of convergence rate and steer direction. In addition, the effect upon signal-to-noise gain of freezing the adaptive filter set is described. Both on-azimuth and off-azimuth signals are examined to determine how much they are attenuated in the adaptive filter beam in comparison with the beamsteer output. Signal-to-noise gain values presented are measured using beam output traces formed from actual seismic data. Theoretical studies of the effect of floating DC levels and roundoff error are also contained in this report.
- Seismic Detection and Detectors