| 摘要 |
To determine the speed of propagation of a signal in a medium, signals with known harmonic components are transmitted from one or more sources within the region. One or more detectors within the region measure wave amplitude over time at so as to detect the signals transmitted at the sources and so as to identify the source from which each detected signal was transmitted. Beta bar coefficients are calculated so as to maximize the correlation of the calculated matched field processing power and the measured matched field processing power for each source-detector combination. Beta coefficients for all cells through which a path from a source to a detector passes are calculated by representing all positions in the region by cell number i and position coordinate z, the region being partitioned into M discrete, indexed cells Ci; expressing the wave speed as a known function w of the beta coefficients; and calculating the beta coefficients based on the beta bar coefficients, on the path lengths between each source and each detector combination, and on the lengths of those paths passing through each cell. The wave speed is then calculated by using the function w and the beta coefficients.
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