针对机载激光对埋地天然气管道自主定位这一特殊应用背景,对其定位原理进行研究,阐述其实现方法,分析激光对管道定位精度影响的因素,介绍定位误差建模方法.以载机位姿误差为例,给出定位误差敏感误差源的辨识方法和步骤 结果表明:载机的位姿精度是影响定位精度的主要因素,俯仰角误差对地面点误差影响最大,滚转角误差对地面点误差的影响较小,地面点的定位误差几乎不受载机高度误差的影响.分析结果提高了定位误差避免和误差补偿的效率.%Based on the particular application background of the remote sensing detection of the buried natural gas pipeline leak by the airborne laser, the accurate positioning of the buried natural gas pipeline by the laser is prerequisite. The basic theory of the airborne laser-to-ground positioning system was briefed and the realized method was introduced, and the influence of the laser on the positioning system was analyzed. The general error equation of this remote sensing system was derived from the error propagation law and the accuracy under different conditions was estimated. The results show that the position and orientation accuracy of the airborne is the main factor affecting the positioning accuracy. The error in pitch angle plays a more important role in ground point error, while the roll angle has little effect. Under the consideration of point positioning accuracy, the influence of the error in altitude is the least. These analysis results can enhance the efficiency of error prevention and error compensation.
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