Performance analysis of ultrasonic ranging using a digital polarity correlator

Abstract

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.

Improvement of Measurement Range via Chaotic Binary Frequency Shift Keying Excitation Sequences for Multichannel Ultrasonic Ranging System

“…In our experiments, a SensComp 600 series instrument-grade electrostatic sensor was used as both transmitter and receiver. After band-pass filter, automatic gain control amplification and shaping, the polarity correlation [16] between the binary echo signal and a reference echo signal was carried out. The reference echo signal was recoded from an acrylic board placed 40 cm in front of the ultrasonic sensor.…”

A Novel Vehicle Ranging Method Based on Self-Calibration Principle

“…Vehicle ranging is an important guarantee for the safe operation of the vehicle. It is well known, there are many methods of vehicle ranging, such as ultrasonic ranging, laser ranging, infrared ranging and so on [1]. In these methods, ultrasonic ranging is the most widely used for its economy and stability.…”