提出一种适合中长基线GPS网络差分的模糊度解算方法.根据网络差分站间整周模糊度只用于基线解算而不用于定位的特点,将伪距观测值应用于常规宽巷组合,形成一种新的抗差性强、无大气传播误差的GPS组合观测值;采用站星双差方法计算模糊度浮点解并建立法方程,利用高度角与大气误差的关系构造权阵,通过LAMBDA方法进行固定解搜索,实现模糊度快速解算.对三个参考站同步观测数据的实际测试结果表明:该方法网络模糊度解算时间小于200 s,基线长超过60 km.并满足闭合性原则.%An approach to fix the ambiguity of middle-long baseline is proposed.Based on the fact that ambiguity fixing for network difference aims directly to baseline solution but to positioning,a new GPS observation,being robust and free to atmosphere error,is combined by applying pseudo-range observation to conventional wide-lane combination.In order to fix ambiguity using LAMBDA,a weight matrix,established by the ratio between the elevations to the atmosphere error,is used to calculate the double difference observable equation.Applying the approach to the network with three reference stations.their baseline length is longer than 60km,the ambiguity is fixed within 200 S,thus meeting the ambiguity closure principle.Experimental results show that the approach developed in the contribution is applicable to fix ambiguity efficiently of middle-long baseline for NRTK.
展开▼
