脉冲激光成像探测系统回波信号仿真

Simulation of Echo Signal in Laser Imaging Detection System

研究激光脉冲回波信号特性并建立其数学模型,是应用回波信号处理技术处理回波,生成目标三维激光仿真图像的基础。首先建立了激光器发射脉冲信号能量在时间和空间上的分布模型,然后依据成像目标的激光图像仿真模板,采用累加激光脚印各采样区发射脉冲信号与对应目标散射面单位冲激响应卷积值的方法,生成了探测器接收回波仿真信号,最后分析了影响回波信号仿真精度的因素。通过对激光脚印采样区个数的合理设置实现了激光脉冲回波波形的精确仿真。

The simulation and analysis of the laser pulse echo signal are very useful to study different kinds of echo signal processing approaches and produce 3-D laser simulated images for target. In this study, the uniform time propagation and spatial distribution models of the emitted laser pulse were built. The reflected signal from the laser pulse sent at the laser imaging simulation template arising from 3-D target model could be calculated as a convolution sum between the impulse responses and the emitted pulses for the subareas in the laser footprint. The simulation analyses show that the ranging error caused by the simulation approximations is minor, and the better simulation precision of the echo signal is achieved in coordination with high simulation efficiency by adjusting the number of the subarea in the laser footprint.