GENERATION OF DOPPLERIZED, ASPECT DEPENDENT, HIGHLIGHTED SIMULATED ECHOES

摘要

Sonar echoes are simulated with doppler effects characterized by frequency shifts proportional to the transmitted frequencies. Memory and logic means read in and store a digital representation of sonar signal at a set rate and then read out the signal at a rate determined by range rate of change. An aspect dependent echo highlight generator and an aspect dependent attenuator both utilizing digital techniques are described as part of the simulation apparatus.