摘要
针对自主着陆过程中沙尘对调频连续波激光探测的干扰问题,基于蒙特卡罗方法研究了沙尘干扰下激光探测回波的功率谱密度特性。首先对沙尘回波组成进行分解,推导了回波的功率谱密度方程,然后基于蒙特卡罗方法进行仿真,分析了地面反射信号、沙尘干扰信号和随机噪声的功率谱密度特性。结果表明在沙尘浓度较低时,干扰对中频信号的影响较小,随着沙尘浓度的增大,干扰信号会不断增强且不易滤除,对测距精度影响较大。
This paper aims at the interference of dust to the frequency modulated continuous wave laser detection during the autonomous landing process.The power spectral density characteristics of the laser detection echo under the interference of dust are studied based on Monte Carlo method.Firstly,the composition of the dust echo is decomposed,and the power spectral density equation of the echo is deduced.Then,based on the Monte Carlo method,the power spectral density characteristics of ground reflection signal,signal of dust interference and random noise are analyzed.The results show that when the dust concentration is low,the interference has little effect on the intermediate frequency signal.With the increase of the dust concentration,the interference signal will continue to increase and is not easy to filter,which has a great impact on ranging accuracy.
作者
陈鹏
赵继广
张一鸣
宋一铄
朱博
CHEN Peng;ZHAO Jiguang;ZHANG Yiming;SONG Yishuo;ZHU Bo(Graduate School,Space Engineering University,Beijing 101416,China;Beijing Institute of Remote Sensing Information,Beijing 100192,China;Department of Electronics and Optical Engineering,Space Engineering University,Beijing 101416,China)
出处
《激光杂志》
北大核心
2020年第10期29-33,共5页
Laser Journal
基金
国家自然科学基金(No.61805284)。
关键词
激光探测
沙尘干扰
蒙特卡罗
功率谱密度
laser detection
interference of dust
Monte Carlo
power spectral density
