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

doi:10.11947/j.AGCS.2018.20170296

Abstract

Abstract: 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.

Key words: multi-carrier ambiguity resolution, equality lemma, ionosphere-free combination, linear constraints, model's strength

CLC Number:

P228

JIA Chun, ZHAO Lin, LI Liang, CHENG Jianhua, LI Hui. Ionosphere-free Multi-carrier Ambiguity Resolution Method Based on Ambiguity Linear Constraints[J]. Acta Geodaetica et Cartographica Sinica, 2018, 47(7): 930-939.

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