Signal Processing Techniques for Sound Ranging: From Correlation Functions to Target Coordinates
Interim rept. 1 Jan-31 Oct 1968
BOLT BERANEK AND NEWMAN INC CAMBRIDGE MA
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This report considers the problem of predicting target coordinates, given a temporal and spatial distribution of shots from a multiplicity of targets. The method is based on analyzing multifold polarity-coincidence correlations of acoustic signals received at a configuration of azimuth- determining arrays. The process of generating multifold correlation functions, is reviewed with emphasis on those properties which are of concern in azimuth determination. An azimuth determination algorithm designed to make most effective use of the information contained in the correlation function is described. The discussion of generalized triangulation points out the weaknesses of traditional methods, and outlines a probabilistic approach to triangulation that would yield an optimal prediction for a given set of azimuths. Because this probabilistic approach would be extremely demanding in computational requirements, an alternative method is presented based on similar concepts but yielding a closed-form solution. This new method of generalized triangulation is tested with synthetic data, and found consistently more accurate than the traditional method.
- Acoustic Detection and Detectors