无合作目标测距的回波接收系统设计与分析

对于调频连续波无合作目标测距来说,回波接收系统是其光学系统中重要的组成部分,其接收特性也影响着系统的测距精度。为对其进行设计与分析,利用光学设计软件对以卡塞格林望远镜与多模光纤为主体的接收系统进行了建模,通过像差与光接收效率的分析与优化确定系统选用的卡塞格林望远镜的参数。建立待测物后向散射的高斯散射模型,并搭建完整的接收光路进行实验,定量分析了不同情况下系统的接收功率,并研究了接收效率、聚焦位置等与待测物的距离和表面散射之间的规律。研究结果表明,对于相同的加工方式的样块,系统接收功率与粗糙度、待测物距离成负相关规律,系统聚焦距离与粗糙度、待测物距离呈正相关规律。

Design and analysis of echo receiving system in non cooperative target ranging

Echo receiving system is an important part in the optical system of frequency modulated continuous wave non cooperative target ranging; and its receiving characteristics have certain influence on the ranging precision of the system. In order to conduct the design and analysis of the system, optical design software was used to conduct the modeling of the receiving system with Cassegrain telescope and multimode fiber as the main body, and the parameters of the Cassegrain telescope were determined through analyzing and optimizing the aberration and optical receiving efficiency. The Gaussian scattering model for the backscattering of the target was established; a complete receiving optical path was built to conduct the experiment; the received power of the system was analyzed quantitatively under different conditions, and the rules between receiving efficiency, focusing position and target distance, surface scattering were investigated. The research results show that for the sample blocks processed with the same method, the system receiving power is negatively correlated with the roughness and target distance, while the system focusing distance is positively correlated with the roughness and target distance.