低噪声回波测距系统的电路设计与系统分析

描述了超声波脉冲回波测距系统的基本组成,重点研究了超声波测距系统中的低噪声问题,设计了分时和分区的开关隔离式超声波发射和接收电路,彻底切断了发射电路和其他电干扰信号对接收电路的影响.低噪声"能量球"的设计,极大地提高了回波的信噪比,实现了超声波低功率发射条件下的信号稳定接收.同时介绍了软件滤波器在超声波的智能化低噪声处理方面的应用.

Design and analysis of the lower electronic noise circuit with a ultrasonic pulse echo ranging system

The basic parts of the distance measurement of a pulse echo system were described. The study of lower noise electronic circuits was emphasized in the ranging system. A new kind of emitting and receiving circuit was designed with an isolated switching circuit to form different switching times and isolated current circuits, and the routing of the electronic noise from the emitting circuit to the receiving circuit was totally isolated. The new principle of "energy ball" was proposed to increase the signal-to-noise ratio distinctly, and the ability of receiving echo signals is more stable in the normal power consumer. Also a software filter in the digital data base of the pulse echo was introduced in the application to intelligent noise reduction.