一种新的激光扫描仪多回波处理电路设计

Design of a new echo processing circuit of laser scanner

针对目前激光扫描仪多回波处理所用高采样率A/D采样电路的设计难度大、成本高的问题,提出一种新的多回波处理电路实现方法。首先简述了典型A/D采样电路的一般设计方法。其次提出了一种主要由高速比较器、时间延迟电路、脉冲产生电路、脉宽测量电路、加法电路以及一个现场可编程门阵列(FPGA)共同组成的新的多回波处理方法,并对重要模块的设计进行了阐述。最后通过实验验证了该电路可有效处理双脉冲回波。该电路设计成本较低,相对A/D采样电路设计难度较小。

At present, in the application of laser scanner, the most popular method to deal with the multiple echoes is sampling by high speed A/D first and then handling with complex algorithm. Because of the A/D chip is very expensive and it is hard to design, a new method is proposed. Firstly, an A/D sampling circuit design method is described. Then, a new circuit composed of comparator, time delay circuit, pulse generating circuit, pulse width measurement circuit, added circuit and Field Programmable Gate Array(FPGA) is proposed. This method is proved effective in dealing with two pulse echoes by experiment. This circuit costs less and is easier to design compared to A/D sampling circuit.