A Comparison of Time-Domain Parabolic Equation and Measured Ocean Impulse Responses
1990
Leclere, J. H. | Field, R. L.
The time-domain parabolic equation (TDPE) model, developed by Collins, is a broadband, range-dependent, acoustic propagation code. TDPE has the capability of modeling high-angle acoustic propagation and of accounting for attenuation in sediments, which are advances over an earlier time-domain formulation of PE. The high-angle capability is achieved by evaluating Pade series coefficients in the PE operator instead of Taylor series coefficients, which were used in the initial formulation of PE. The TDPE model is shown to accurately model measured ocean impulse response in a near-field shallow water ocean environment. Ocean impulse response functions are measured by cross- correlating the source signature of a 20 to 150 Hz swept frequency signal with the signals received on a vertical line array. The autocorrelation of the swept signal is the input source pulse for TDPE. Ocean-bottom parameters are developed from Deep Sea Drilling Project sites near the experimental area. The capability of TDPE to model high-angle (70-75 deg) multipath propagation is established. TDPE results are compared to results from the fast field algorithm, SAFARI.
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