相关法高抗干扰超声波距离测量中的信号处理

Signal Processing in Correlation Based Robust Ultrasonic Distance Measurement

提出了一种建立在信号模型基础上的高抗干扰超声波距离测量相关法 .通过对超声波传感器频率特性的分析而求得一个十分简单的超声波匹配电路 .为了降低所处理的信号频率采用了调制与解调技术 .由于伪随机二进制信号PRBS和超声波传感器的特性 ,可用方波载波信号来有效地代替正弦波载波信号 .还描述了用于提高采样频率的线形内插法和用于抑制分散回声的均值法 .

This paper introduces the correlative robust distance measurement approaches based on the signal models.The very simple match circuits of the ultrasonic sensors were obtained by analyzing the frequency properties of the ultrasonic sensors.The modulation and demodulation were used to reduce the frequency of the processed signals.The carrier signals were substituted with the rectangle signals because of the properties of the pseudo random binary sequences (PRBS) and the ultrasonic sensors.This paper describes also the linear interpolation for the increase of the sampling frequency and the average method for the suppression of the scattering echoes.