Doppler Dispersion Losses in the Reduced Averaging Processor for the Linear Swept FM Pulse

Abstract

Reduced averaging processing of the linear swept FM pulse signal has been studied by the technique of using one common reference signal with one common set of step oscillators for multiple acoustic channels. Doppler dispersion effects versus the doppler resolution accuracy in both point and a special type of extended target are considered. Under the matched echo and reference signal slopes, the stated processing technique acts as the matched filter processor for both point and extended targets. Under the mismatched echo and reference signal slopes for the point target case, the Doppler dispersion loss is negligible and the stated processing technique does not degrade the resolution performance from the system that provides more than one reference signal. When the target is extended and both echo and reference signal slopes are mismatched, the stated processing technique indicates the serious dispersion loss; therefore, the resolution accuracy is jeopardized. In other words, it is necessary to have multiple reference signals for the specified resolution accuracy.