基于CDMA的抗杂光干扰激光测距技术研究

为了解决固定周期激光测距系统抗杂光干扰性能差的问题,文中提出了一种基于CDMA技术的激光测距系统方法,该系统以FPGA为主控芯片,采用码分多址调制方法生成随机跳变的脉冲信号进行发射,同时在接收到回波后进行相应的门限检测,滤除干扰信号,仅使真实的回波通过并触发计数器停止计数,完成测距过程。实验结果表明,该方法确实能有效的滤除杂光干扰信号,提高激光测距系统的抗干扰性能。

Research on a Technique for Laser Ranging System with the Capacity of Anti-interference Based on CDMA

There is a problem with the traditional laser ranging system,it's capacity of anti-interference is bad.In order to resolve that problem,this paper proposes a method of laser ranging system based on CDMA.This system uses the FPGA chip as the master chip,adopts the multiple access modulation method to generate random pulse to send,at the same time it uses the threshold detection to receive signals after detects echos,this method can filter the interference signal,only make the real signal through the threshold detection and trigger the counter stop to count,then it can complete the ranging process.The experimental result shows that this method do filter light disturbance effectively,improve laser ranging system anti-interference performance.