Shallow Water RASP Upgrade
1991
Fulford, J. K.
The Range Dependent Active System Performance model (RASP) has been modified to function at higher frequencies in shallower water than its initial design specification. The major difficulties in the original version of the model were the control of the cubic spline fitting routines to the sound speed points, extension of attenuation coefficients to higher frequencies and the need to interface to Navy standard data bases (or models) for bottom loss calculations. These two areas of difficulty were overcome using a front end sound speed fitting algorithm based on cubic splines under tension to control the oscillations in the spline fits in the model, and subroutines to allow input of standard bottom loss curves. The resulting modifications to the model created a model capable of predicting range dependent monostatic reverberation (with reasonable accuracy) at frequencies up to kHz. The modifications did not address the broader problem of bistatic range dependent reverberation at high frequencies (or in shallow water), or the problem of energy splitting loss on predicted target returns.
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