相关法高抗干扰超声波距离测量中的信号处理

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.
关键词: 相关法超声波距离测量技术; 超声波传感器; 调制解调; 信号处理
Abstract : This paper int roduces the correlative robust distance measurement approaches based on the signal models. The very simple match circuit s of the ult rasonic sensors were obtained by analyzing the f requency properties of the ult rasonic sensors. The modulation and demodulation were used to reduce the f requency 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 ult rasonic sensors. This paper describes also the linear in2 terpolation for the increase of the sampling f requency and the average method for the suppression of the scat2 tering echoes.
Key words : correlative ult rasonic distance measurement approaches ; ult rasonic sensors ; modulation and de2 modulation ; signal processing