Reliable recognition of ultrasonic echo-signal under high-noise background using digital signal processing

摘要

In practice, it is very important to recognize the ultrasonic echo-signal under high-noise background. In this paper, the Fourier spectrum and composition of ultrasonic ranging signals under high-noise background have been analyzed firstly, then the recognition of ultrasonic echo-signal has been realized using three methods: frequency filter, auto-correlation and the effective combination of the former two methods. The mathematical models are established and the results are given both theoretically and experimentally.