ASA 124th Meeting New Orleans 1992 October

4pUW7. Comparison of propagation models for source localization in a sloping shallow-water environment.

P. Jackson

Naval Res. Lab., Stennis Space Center, MS 39529

J. Wolf

T. C. Yang

Naval Res. Lab., Washington, DC 20375

Benchmark tests of propagation models have been conducted by comparing transmission loss of individual phones. While various propagation models often yield the same (range) averaged transmission loss, they differ in the calculation of phases. The difference in the calculated pressure field is examined here in terms of source localization in a sloping shallow-water environment. This study examines the impact on source localization due to boundary reflection loss, bottom bathymetry and profile, and mode coupling which are handled differently by different models. In particular, the coupled normal mode, adiabatic normal mode, and PE propagation codes are examined. The calculated pressure field from individual models are analyzed in terms of the normal mode amplitudes at the receiver site. The difference of mode amplitude surfaces are plotted as a function of source range to evaluate the range dependence of propagation model mismatch.