PULSE-ECHO PHASE DISCRIMINATOR USING DELTIC PROCESSING

摘要

This disclosure is of a pulse-echo signal processor for deriving and displaying bearing angle information by measurement of the phase difference of echo signals received at two spaced points. Bearing angle determination is accomplished by processing signals received at each of the two spaced points through a moving time series DELTIC and correlating the time-compressed outputs with the transmitted signal which is correspondingly time-compressed in a stationary time series DELTIC. The correlation signals thus generated are combined to provide an unthresholded display output, in which the input signal amplitude information is preserved, and a thresholded output to a timer which indicates the desired phase difference measurement.