Ultrasonic soundings of targets by processing of signals from plural receivers

Abstract

A method for acoustic soundings of targets is proposed. Ultrasonic M-sequence signal is transmitted through the medium under investigation and reflections from the targets are received by plural receivers at different positions. The cross correlation function between the original M-sequence and the reflected signal is adopted to detect any reflection and based on it, a method is presented to find the exact location of the target. In order to detect the expected peaks corresponding to the targets in the cross correlation function, a novel design of inverse filter is proposed so that the system can work under heavy ambient noise condition.