光学 精密工程, 2009, 17 (2): 388, 网络出版: 2009-10-09
机载测量平台中的坐标转换误差分析
Analysis on coordinate conversion error of airborne measuring device
机载测量平台 定位 引导 齐次坐标转换 误差分析 蒙特卡罗法 airborne measuring device positioning guiding homogeneous coordinate conversion error analysis Monte-Calro method
摘要
为了提高机载测量平台的定位精度和引导精度,利用齐次坐标转换法推导了从大地坐标系到望远镜坐标系的转换方程,并在此基础上建立了误差分析的数学模型。运用蒙特卡罗法的思想,综合分析了机载测量系统中各参数对结果的影响。提出了改善平台测量精度首先要解决的就是载机姿态精度;其次是载机(或目标)的位置精度;此外,通过数据处理来提高定位精度也是有效的方法。实验结果表明:姿态精度从0.3°提升至0.1°后,定位精度和引导精度都可提高30%;载机位置精度从20 m提升至5 m后,定位精度可提高9%。分析过程和结果对机载测量平台的设计有一定的参考价值。
Abstract
In order to improve the positioning accuracy and guiding accuracy of an airborne measuring device, a mathematical model of error analysis is established based on the coordinate conversion equation from geodetic coordinates to telescope coordinates deduced by the homogeneous coordinate conversion theory. The effects of some parameters in airborne measuring device on positioning result and guiding result are theoretically analyzed using Monte-Calro method. Several approaches to improve the accuracy of airborne measuring device are presented, such as improving the attitude accuracy and position accuracy of airplane. In addition, it is pointed that data processing is also an effective method to improve the positioning accuracy. The results indicate that positioning accuracy and guiding accuracy can both be increased by 30% through changing airplane attitude accuracy from 0.3°to 0.1°, and positioning accuracy can be enhanced by 9% through changing airplane position accuracy from 20 m to 5 m. The analysis process and result are useful for designing airborne measuring device.
王晶, 高利民, 姚俊峰. 机载测量平台中的坐标转换误差分析[J]. 光学 精密工程, 2009, 17(2): 388. WANG Jing, GAO Li-min, YAO Jun-feng. Analysis on coordinate conversion error of airborne measuring device[J]. Optics and Precision Engineering, 2009, 17(2): 388.