残余振动导致激光雷达成像模糊的研究  

Lidar image blur caused by residual random vibration

作　　者：苏恒[1] 严惠民[1] 张秀达[1] 杨超[1] 

机构地区：[1]浙江大学现代光学仪器国家重点实验室,浙江杭州310027

出　　处：《红外与激光工程》2011年第11期2174-2179,共6页Infrared and Laser Engineering

基　　金：国家973计划(2009CB72400404);国家863计划(2009AA12Z142)

摘　　要：由于机载凝视成像激光雷达对地测距采用稳定平台,抑制了飞行过程中的高频振动,随机振动影响成像质量的成分主要是中低频振动。建立了随机振动模糊的理论模型,分析了采用多曝光叠加的动态成像过程中像素间串扰的影响机理。结合双通道三维主动测距方案,通过对具体的稳定平台振动谱的分析,研究了曝光时间与像素串扰半径、相对测距误差系数之间的关系。通过仿真程序得出满足横向分辨率要求下的最佳曝光时间,从而提高了系统的测距性能。In application of earth observation using airborne staring imaging lidar, the high-frequency vibration is restrained by the stabilized facility such as gyro vibration absorber. And the medium and low frequency vibration are the main factors that blur the intensity images. A random vibration modal was proposed and the crosstalk between two neighboring pixels was analyzed when the multiple exposal and superposition were employed. Then, the relationship between the crosstalk radius and relative ranging error in different exposure time was analyzed by combining the method of double-channel three dimensional active imaging and referring to the residual spectrum. Finally, the best exposure time according to the resolution requirement was presented by the simulation program, and the performance of the system had been improved.

关 键 词：成像激光雷达 稳定平台 随机振动 像素串扰 相对测距误差系数 

分 类 号：TN958.98[电子电信—信号与信息处理]