Performance analysis of ultrasonic ranging using a digital polarity correlator

摘要

This paper presents performance analysis of the distance measurement using a digital polarity correlator applied to the ultrasonic ranging system, consisting of piezoelectric transducers for pulse echo operation and a pulse compression filter using chirp signals. Analytical and simulation results show that the technique of one-bit correlation is as effective as two-bit correlation with respect to signal-to-noise ratios and probability of detecting a target, and further that both methods approach results obtained from a complete correlation of received signals with a reference signal, in the case that the threshold of the received signals is adjusted with regards to the noise level. Experimental results show close agreement with the presented theory.