Patent ID: 8385152
Filing Date: 2013-02-26
Classification: G01H,G01S,G01V

Abstract:
1. A method of estimating a sound speed, the method comprising: transmitting a first acoustic signal through a water column from a first location; transmitting a second acoustic signal at a second location; receiving a first scattered signal at a third location, the first scattered signal comprising a plurality of echoes of the first acoustic signal reflected by a scattering layer within the water column; receiving a second scattered signal at a fourth location, the second scattered signal comprising a plurality of echoes of the second acoustic signal reflected by the scattering layer; estimating a travel time based on at least one of the echoes of the first acoustic signal reflected by the scattering layer or the echoes of the second acoustic signal reflected by the scattering layer; generating a cross-correlation signal comprising the cross-correlation of at least one of the echoes of the first scattered signal and at least one of the echoes of the second scattered signal in accordance with the bistatic invariance principle; estimating a travel time difference based on at least the cross-correlation signal; and estimating a sound speed based on the estimated travel time and the estimated travel time difference.