影响机载激光扫描测高精度的系统误差分析  

Analysis of Systematic Error Influencing the Accuracy of Airborne Laser Scanning Altimetry

作　　者：刘经南[1] 张小红[2] 李征航[2] 

机构地区：[1]武汉大学校长办公室,武汉市珞珈山430072 [2]武汉大学测绘学院,武汉市珞喻路129号430079

出　　处：《武汉大学学报（信息科学版）》2002年第2期111-117,共7页Geomatics and Information Science of Wuhan University

基　　金：国家自然科学基金资助项目 ( 4 0 0 0 40 0 1)

摘　　要：简要介绍了机载激光扫描测高技术的系统组成和发展现状。通过坐标转换技术建立起机载激光扫描对地定位的基本几何关系 ,并从这些几何关系出发 ,着重分析了动态偏心改正及动态时效误差对机载激光测高精度的影响 ,对不同的误差源如何影响定位结果的精度进行了讨论 ,最后给出模拟计算结果 ,得出了一些有益的结论。In this paper the error sources related to the laser instrument,GPS,and INS are analyzed in details.Several coordinate systems used in airborne laser scanning are set up,and then thebasic formula of the system is given.This paper emphasizes on discussing the kinematic offset correction between GPS antenna phase center and laser pulse fired point.And kinematic time delay influence on laser footprint position,the ranging errors,positioning errors,attitude errors and inte_gration errors of the system are also explored.Finally,the result shows that the kinmatic time delay can be neglected in comparison with other errors.The accuracy of the coordinates is not only influenced by the amplitude of the error,but also controlled by the flight height,scanning angle amplitude and attitude magnitude.

关 键 词：机载激光扫描测高 动态偏心改正 动态时延 误差分析 模拟计算 坐标转换 

分 类 号：P228.5[天文地球—大地测量学与测量工程]