微弱距离信号检测电路的设计与实验验证

Design and Experimental Verification of Weak Distance Signal Detection Circuit

由于经典的蔡氏电路对电路的参数非常敏感,因此以蔡氏电路的简易结构为基础,结合自制的简易示波器、数字电位器及STM32单片机对非线性电路进行了详细的研究,设计并搭建了混沌电路测量微弱距离信号系统。通过把距离信号转换成蔡氏电路敏感的动态电阻,可轻易实现对微弱距离信号的检测。通过与Agilent DSO3102A双通道数字示波器测得的相轨迹曲线作为对比,证明了所设计的非线性电路及搭建的系统不仅简单易操作,而且非常适合初学者对非线性系统的实践操作。最后利用搭建的混沌电路测量微弱距离信号系统对障碍物的距离进行了实验测试,实验中测量的最远距离6.98 m。

Because the classical Chua’s circuit is very sensitive to the circuit parameters.Therefore,based on the simple structure of Chua’s circuit,combined with the simple oscilloscope,digital potentiometer and STM32 single chip microcomputer,the nonlinear circuit was studied in detail,and the chaotic circuit measuring weak distance signal system was designed and built.By converting the distance signal into the sensitive dynamic resistance of Chua’s circuit,it can detect weak distance signal easily.By comparing with the phase trace curve measured by Agilent DSO3102 A dual channel digital oscilloscope,it was proved that the nonlinear circuit and system designed were not only simple and easy to operate,but also very suitable for beginners to practice nonlinear system.Finally,the distance of obstacles was tested by using the chaotic circuit measuring weak distance signal system.The maximum distance measured in the experiment is 6.98 m.