激光回波模拟系统

Laser Echo Simulation System

激光检测系统分为激光发射、激光接收和回波信号处理三大部分。激光发射模块采用传统激光测距仪,激光接收模块釆用激光接收管,信号处理模块釆用FPGA编程实现,采用高精度延时模块实现对激光距离的模拟。主要完成了采样数据的缓存和处理以及整个电路的时钟控制、逻辑控制和时序控制。采用激光回波模拟系统,可以模拟激光在大气回波的传输过程,提供远距离的虚拟目标,实现对大测程指标的检测。以Spartan-6系列FPGA为设计平台,高速的时钟电路使用300 M内部倍频电路,实现回波延时精度达到3 ns左右,使系统具有快速性,而且实时性能好,同时FPGA具有并行处理的特点。

A laser detection system is divided into three parts, which are laser emission, laser receiving andecho signal processing. Traditional laser range finder is used as laser emission module. Laser receiving tube is usedin laser receiving module, signal processing module is realized by field programmable gate array（FPGA） and a highprecision time-delay module is used to simulate laser distance. The buffer storage and processing of the sampling da-ta, the clock control, logic control and sequence control of the whole circuit are mainly completed. The laser echosimulation system is used to simulate the transmission process of laser echo in atmosphere and provide remote virtu-al targets, and to get the longest measurement range parameter. With FPGA series Spartan-6 as the design platform,a 300 M internal frequency multiplier circuit is used in the high speed clock circuit to realize 3 ns time-delay preci-sion. The system has the characteristics of high speed, good real time and FPGA has the characteristic of parallelprocessing.