Hyperbolic Fits to Time-of-Arrival Sound Ranging Measurements.
NEW MEXICO STATE UNIV LAS CRUCES PHYSICAL SCIENCE LAB
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A simple algorithm is presented for fitting a hyperbola to the times of arrival of sounds at each of several microphone locations along a linear array. Timing points, taken in groups of three, are tested for causality to determine that they can be associated with a physically realizable source location. The resulting parameters defining the fit or averaged hyperbola are themselves an initial estimate of source location and sound emission time. After transformation to field co-ordinates, these estimates are capable of being used as input to existing sound ranging algorithms which correct for wind and temperature. If displayed with raw data, the hyperbola may be used in future to aid personnel in identifying related signals from among background clutter and for initial visual assessment of data quality. The algorithm is expected to be a useful tool in supporting advanced ranging techniques. Author
- Acoustic Detection and Detectors