模糊度线性约束的消电离层多频模糊度解算

Ionosphere-free Multi-carrier Ambiguity Resolution Method Based on Ambiguity Linear Constraints

针对传统多频模糊度解算方法受到电离层延迟影响造成窄巷模糊度解算可靠性降低的问题,提出一种基于模糊度线性约束的消电离层MCAR方法。该方法通过模型等价性原理构建了基于几何相关-消电离层组合模型,并凭借能够可靠解算的超宽巷/宽巷模糊度值形成线性约束,进而构造窄巷模糊度解算模型,最终求解窄巷模糊度及精密定位结果。多组北斗三频实际数据测试结果表明,即使双差电离层延迟达到73.2cm,所提出方法也可实现模糊度解算成功率高于96%,定位精度优于15cm。

Ionospheric delay is a crucial factor affecting the reliability of narrow-lane ambiguity resolution in the traditional multi-carrier ambiguity resolution(MCAR)method.To obtain a better narrow-lane ambiguity resolution performance,a new ionosphere-free MCAR method based on ambiguity linear constraints is proposed.The method constructs a geometry-based and ionosphere-free model by using the equality lemma,and then formats a narrow-lane ambiguity resolution model to resolve narrow-lane ambiguity and precise position depending on the ambiguity linear constraints formed by reliable extra wide-lane/wide-lane ambiguity value.The performance of the proposed method is tested by a series of experiments.The results denote that the proposed method achieves higher than ambiguity success rate of 96%and the position precision of about 15 cm,even though the double-differenced ionospheric delay increases up to 73.2 cm.