粗糙目标合成孔径激光雷达信号仿真

Simulation of the Rough Target′s Signal in Synthetic Aperture Ladar

建立粗糙表面的蒙特卡罗模型,研究目标表面高度起伏对光外差信号的调制效应,对不同粗糙程度的目标引起的退相干效应进行定量分析,给出光外差信号恶化与粗糙目标表面参量的定量关系.结果表明:当相关长度为100λ,光外差信号随着高度起伏均方根的增大而减小,当高度起伏均方根超过0.2λ时,光外差信号非常微弱;当均方根高度起伏为0.1λ时,光外差信号随相关长度的减小而减小,给光外差探测造成困难.

Based on Mente Carlo method, the modulating effect of the target surface roughness on the optical heterodyne signal was discussed. The quantitative analysis of the decoherence effect caused by the roughness of targets was investigated. The relationship between the optical heterodyne signal and rough parameters of the target was given. It is shown that when the correlation length is 100λ, the optical heterodyne signal increases with the height of the root mean square fluctuation decreasing. When the height of the root mean square fluctuation exceeds 0. 2λ, the optical heterodyne signal is very weak. In addition, when the height of the root mean square is 0.1λ, the optical heterodyne signal decreases with the correlation length decreasing. It seriously affects the optical heterodyne detection of a rough target.