摘要
单频全球定位系统模糊度在航解算过程中存在法方程病态的问题,利用历元间坐标差信息可以在一定程度上削弱法方程的病态性,提高模糊度浮点解的精度和模糊度收敛速度。为进一步提高历元间坐标差法固定模糊度的效率,提出了一种改进的历元间坐标差方法,该方法对历元间坐标差虚拟观测误差方程进行了重构,并给出了新的虚拟观测值方差阵。实验结果表明,新方法较之以往的历元间坐标差方法具有更优的稳定性和效率。
Single-frequency GPS ambiguity resolution on-the-fly has the problem that normal equation is ill-posed. Using epoch-differenced coordinate information between neighboring epochs can mitigate the ill-condition problem to some extent, as a result, the accuracy of the float ambiguity solution will be improved and the convergence time of ambiguity will be shortened. In order to further improve the ambiguity fixing effciency of epoch-differenced method, the epoch-differenced coordinate pseudo-observation error equation and its new variance matrix is reconstructed. The experimental results show that, compared with the previous algorithm with epoch-differenced coordinate information, the new method has higher stability and efficiency.
作者
易重海
陈源军
YI Zhonghai;CHEN Yuanjun(School of Geosciences and Info-Physics, Central South University, Changsha 410083, China;Guangzhou Hi-Target GNSS Navigation Technology Co Ltd, Guangzhou 511400,China)
出处
《武汉大学学报(信息科学版)》
EI
CSCD
北大核心
2019年第4期489-494,共6页
Geomatics and Information Science of Wuhan University
基金
国家自然科学基金(41204024)
国家测绘地理信息局测绘基础研究基金(12-01-06)
现代城市测绘国家测绘地理信息局重点实验室开放课题(20111202W)~~
关键词
单频
动态定位
病态性
历元间坐标差
模糊度解算
single-frequency
kinematic positioning
ill-posed
epoch-differenced coordinate information
ambiguity resolution