卫星微振动对测风激光雷达信噪比影响研究  

Influence of Satellite Micro-Vibrationon Signal-to-Noise Ratio of Wind LiDAR

作　　者：曹启鹏[1] 李永昌[1] 董小静[1] 王超[1] 王靖[1] Cao Qipeng;Li Yongchang;Dong Xiaojing;Wang Chao;Wang Jing(China DFH Satellite CO.,LTD,Beijing 100094,China)

机构地区：[1]航天东方红卫星有限公司,北京100094

出　　处：《激光与光电子学进展》2020年第9期196-201,共6页Laser & Optoelectronics Progress

摘　　要：大气风场的测量对于全球气候变化、海上暴风探测、日常天气预报精度,乃至国家军事安全具有重要意义。天基相干测风雷达以其高时-空分辨率、高灵敏度、实时探测、体积小等优点,受到广泛关注。大多数航天器都存在微振动扰动源,会对相干测风激光雷达的信噪比有一定影响。本文在对相干测风激光雷达系统原理分析的基础上,以某型号微振动实测数据为样本,分析了卫星微振动对相干测风激光雷达的信噪比的影响。实验结果表明:卫星微振动对于相干测风激光雷达的信噪比有一定影响,在失配角为3.77μrad时,信噪比在-1.5dB^1.36dB之间浮动,相对来说影响较弱。从微振动的角度来讲,某卫星平台能够满足相干测风激光雷达的探测要求。The measurement of atmospheric wind field is of great significance for global climate change,sea storm detection,accuracy of daily weather forecast,and even national military security.Space-based coherent wind light detection and ranging(LiDAR)has attracted wide attention due to its high time-space resolution,high sensitivity,real-time detection,and small volume.Most spacecraft have micro-vibration disturbance sources,which can influence the signal-to-noise ratio(SNR)of coherent wind LiDAR.Based on the principle analysis of coherent wind LiDAR system,this paper analyzes the influence of satellite micro-vibration on the signal-to-noise ratio of the coherent wind LiDAR,based on the measured data of a certain type of micro-vibration.The experimental results show that satellite micro-vibration has a certain effect on the signal-to-noise ratio of coherent wind LiDAR.When the mismatch angle is 3.77μrad,the signal-to-noise ratio fluctuates between-1.5 dB and 1.36 dB,and the impact is relatively weak.From a micro-vibration perspective,a satellite platform can meet the detection requirements of a coherent wind LiDAR.

关 键 词：遥感 激光雷达 相干测风 微振动 信噪比 

分 类 号：P412.2[天文地球—大气科学及气象学]