基于伪距宽巷组合的GPS模糊度固定方法

中长基线模糊度快速解算是GPS网络差分技术的核心内容。根据网络差分模糊度固定只用于基线解算而不用于定位的特点，通过对常用GPS原始观测数据组合方式的分析，提出伪距宽相组合的数据处理方法，有效消除了电离层、对流层传播误差，形成抗差性强、大气误差自由的GPS组合观测值；在此基础上引入双差伪距宽相组合进行模糊度浮点解并建立法方程，应用高度角与大气误差的关系构造权阵，对常规LAMBDA算法进行了改进，形成一种适合GPS网络差分的中长基线模糊度解算方法。对三个参考站同步观测数据的实际测试结果表明：使用该方法网络模糊度解算时间小于300s，基线长超过60km，并满足闭合性原则。

GPS baseline ambiguity fixing method based on pseudorange widelane combination observation

Middle-Long baseline ambiguity fixing is the kernel of GPS network difference technology. Based on the analysis of the combination method of conventional GPS initial observation,and according to the fact that the network difference ambiguity fixing is only used in baseline calculating not positioning,the pseudorange widelane combination is put forward,in which the ionosphere and troposphere error is effectively removed,and the new GPS observation has excellent robustness and is free to atmosphere error. More double difference pseudorange widelane combination observations are used to participate in the ambiguity float calculating,and establish a normal equation. The weight matrix is also established by the ratio of Elevation to atmosphere error,and the conventional LAMBDA arithmetic is improved. Based on this,a Middle-Long baseline ambiguity fixed method is put forward,which is adapted to network difference. The test for 3 station synchronization observation data show that the time spending on fixing ambiguity by the arithmetic is less 300 s,the baseline length is longer than 60 km,and the sum for all baseline ambiguity value is zero.