BDS参考站三频整周模糊度单历元确定方法

The algorithm of integer ambiguity resolution with BDS triple-frequency between reference stations at single epoch

参考站载波相位整周模糊度的准确确定是实现BDS网络RTK定位的关键。本文研究了BDS参考站三频载波相位整周模糊度单历元确定方法。首先推导了参考站三频载波相位整周模糊度之间的多个整数线性关系,根据双频载波相位整周模糊度的整数线性关系,以及B1载波相位整周模糊度备选值,确定B1/B2和B1/B3载波相位整周模糊度的备选组合。然后利用不受误差影响的三频载波相位整周模糊度间整数线性关系,对整周模糊度备选值进行约束和确定。根据大气误差的空间相关性,采用以卫星高度角和方位角为依据的基准卫星选择方法,降低了对流层延迟误差残差对多频载波相位整周模糊度之间线性关系约束能力的影响。试验结果表明,本文方法能够实现参考站三频载波相位整周模糊度的单历元准确确定,且计算效率高,算法简单。

The carrier phase integer ambiguity resolution between reference stations is very important in BDS network RTK.The algorithm of determining the BDS triple-frequency carrier phase ambiguity between reference stations at single-epoch is studied in this paper.Firstly,the linear relations of triple-frequency carrier phase ambiguity between the reference stations are deduced.Then the ambiguity candidates of B1 and B2 carrier phase are selected by ambiguity candidates of B1 carrier phase ambiguity and the linear relationship of dual-frequency carrier phase ambiguities,and the same as the ambiguity candidates of B1 and B3 carrier phase.The ambiguity candidates of triple-frequency carrier phase are controlled and fixed by the linear relationship between triple-frequency carrier phase ambiguities without errors.In order to reduce the influence of tropospheric delay on the constraint ability of linear relations between multi-frequency carrier phase ambiguities,the method of selecting a reference satellite with altitude and azimuth is used by the spatial correlation of atmospheric errors.The results of test indicate that the carrier phase integer ambiguities of triple-frequency between reference stations can be fixed at single-epoch,and the algorithm is simple and efficient.