Abstract
Future active sonar and underwater communication systems for use in unknown shallow ocean waters may be developed from the automatic spatial and temporal focusing properties of time-reversing arrays (TRAs). Previous simulation results suggest that stationary TRAs will work well with moving sources when the source Mach number is low. This presentation describes simulation results for the case when the TRA is moving and the source is stationary. When the array is moving, the forward and backward propagation necessary for TRA operations is influenced by the Doppler effect in an asymmetric manner. Here, numerical results for the characteristics of the retrofocused field will be presented for a range-independent sound channel based on wide-angle parabolic-equation (RAM by Dr. M. Collins of NRL) or wave number integration (OASES by Professor H. Schmidt of MIT) calculations. Different combinations of array motion and geometry for acoustic center frequencies of several hundred Hertz and nominal ranges up to 10 km will be included, as well as the influence of random bottom roughness. Issues concerning the implementation of a moving TRA in a realistic environment will also be addressed. [Work sponsored by ONR.]
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