亚皮秒级激光回波半实物仿真系统关键技术研究

Research on key technologies of sub-picosecond laser echo semi-physical simulation system

激光回波仿真系统能够根据所模拟的目标生成高频高精度模拟回波信号。提出一种激光回波仿真系统设计方案,系统中采用FPGA生成延时信号,可以对回波信号实现亚皮秒级的延时精度;对光纤通信协议进行了优化,用FPGA实现基于该协议的回波信号传输系统,摆脱了现有方案中对反射内存卡的依赖性,提升了数据的刷新频率。仿真结果表明,所设计的仿真系统数据传输速度达到1.6 Gb/s,回波精度达到125 ps,距离分辨率达到0.05 m。为基于激光阵列的高精度激光制导半实物仿真系统的研制奠定了基础。

The laser echo simulation system can generate high-frequency and high-precision analog echo signals according to the simulated target.This paper presents a design scheme of a laser echo simulation system.The system uses FPGA to generate a delay signal,which can achieve a sub-picosecond delay accuracy for the echo signal.This paper optimizes the optical fiber communication protocol and uses FPGA to implement the echo signal transmission system,which has got rid of the dependence on the reflective memory card in the existing scheme,and has increased the data refresh frequency.The simulation results show that the data transmission speed of the simulation system designed in this paper reaches 1.6 Gb/s,the echo accuracy reaches 125 ps,and the distance resolution reaches 0.05 m.It laid the foundation for the development of high-precision laser guidance semi-physical simulation system based on laser array.