GPS变形监测信息单历元解算的抗差估计方法研究

根据高精度GPS变形监测的特点，介绍了单历元解算监测点变形量的似单差数学模型及其算法．该算法不涉及周跳的探测与修复、双差整周未知数的解算等棘手问题，适用于同步观测卫星数不少于2颗的情况．为提高单历元解算变形信息的可靠性，在分析算法的基础上，构造了实现对卫星进行自动选择的抗差估计模型．3个不同测区的试验数据计算结果表明，本文建立的似单差模型是正确的，采用抗差估计方法来选择卫星也是可行的．

Robust estimation method for solving GPS deformatoin monitor information with single epoch

According to the characteristics of the high precise GPS (global positioning system) deformation monitoring,the similar single-difference mathematical model and its algorithm for solving the GPS monitor points deformation information at the single epoch is introduced in this paper. The troublesome problems of detecting and repairing cycle slips, as well as the solution of double difference ambiguities,are avoided.This model can be used to the circumstances that the number of satellites to be syncronously monitored are not less than two.In order to improve the reliability of the deformation information solved by this model, the robust estimation model for choosing the satellites automatically is build based on analyzing the similar single-difference algorithm. The computed results of the test data from three different survey areas show that the similar single-difference model is correct and using robust estimation to choose satellites is practicable.