研究了基于最小损失函数法的三视场定位定向中各个误差源对定位定向准确度的影响.给出了基于最小损失函数进行三视场天文定位定向的数学模型, 结合模型归纳了定位定向的误差源及其特性, 分析了误差源对定位定向信息对的影响.最后, 建立了定位定向误差仿真模型, 并利用蒙特卡罗法进行误差仿真分析.仿真结果表明系统的定位准确度为88.1 m, 定向准确度为3.0″.分析指出定位定向主要的误差源是水平测量误差, 其次是垂线偏差数据误差.野外实验表明, 该系统的定位准确度为163.0 m, 定向准确度为3.5″, 水平测倾角的误差对定位定向结果的影响较大.

The influence of each error source on the position and orientation determination accuracy in three fields of view celestial positioning and orientation method based on minimum loss function was researched. Firstly, the mathematical model of celestial positioning and orientation of three fields of view based on the minimum loss function was proposed. Secondly, the characteristic and the probability distribution of error source were summarized, the impact of error sources on positioning and orientation information pair was analyzed. Finally, the position and orientation error simulation model was established, and the error simulation was done by using Monte Carlo method. The simulation results show that the mean of position accuracy is 88.1 m, and the mean of orientation accuracy is 3.0″. We point out that dominant error source is horizontal measurement error, and next one is vertical deviation data error. Outdoor experiments show that the mean of positioning accuracy is 163.0 m, the mean of orientation accuracy is 3.5″, and the horizontal measurement error is the main influence on the overall result.