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Comparison of Modeled and Measured Ocean Surface DDMs from Aircraft Measurements of S-Band Satellite Digital Audio Radio Service Transmissions

S-band delay doppler maps (DDMs) acquired by an airborne signals of opportunity receiver developed by Purdue University are compared with model predictions of the same. Particular emphasis in the comparisons is placed on scattering effects outside the specular region traditionally examined in signals of opportunity sensing by examining portions of the DDMs at significant delay and doppler offsets with respect to the specular point.