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| Author: | John Olson |
| Institution: | Geophysical Institute, Univ. of Alaska |
| Email: | jvo@gi.alaska.edu |
| Authors: | Curt A. L. Szuberla, Charles R. Wilson, Kenneth M. Arnoult and Daniel Osborne |
Abstract Title:
"Bias and Uncertainty in Parameter Estimation in Infrasound Arrays" |
Abstract:
This report summarizes the collection of work done at the University of Alaska on the performance of various array geometries in the detection of signals, the estimation of their azimuth and trace velocity and calculation of the uncertainties associated with the estimates. We have also begun the development of an algorithm to estimate the range of signal sources near an array. Our studies began with the description of the original 4-element CTBT array and continued with the proposal, and implementation, of the 8-element array at I53US (Fairbanks, Alaska) and I55US (Windless Bight, Antarctica). These studies included the description of the impulse responses of the complete arrays as well as the impulse responses that result when elements were removed. Following this we began a study of the estimation of bearing and trace velocity for plane-wave arrivals using a least-squares estimator. The estimates of bearing and trace velocity along with their uncertainties and biases have described1 for the complete arrays and for cases where the arrays have lost a sensor. Verification of our calculations has been possible using signals from daily mine explosions near Fairbanks, AK.
1Szuberla, C. A. L. and J. V. Olson, Uncertainties associated with parameter estimation in atmospheric infrasound arrays, J. Acoust. Soc. Am., in press, 2003.
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| Keywords: | Parameter Estimation, Array Processing |
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