INS位置精度对GPS整周模糊度解算影响分析

Analysis of INS Position Accuracy Impact on GPS Integer Ambiguity Resolution

在基于载波相位观测值的DGPS/INS组合导航中,GPS失锁重捕获时,仅利用自身的观测信息很难快速恢复整周模糊度,使用INS位置信息辅助GPS模糊度解算的方法可以有效解决这个问题。以模糊度精度衰减因子(ADOP)作为指标,分别研究了松组合和紧组合两种模式下INS位置精度与GPS模糊度解算成功率之间的关系。结果表明:中低精度的惯导设备能够有效减小ADOP值,提高GPS模糊度解算的精度及可靠性。

Abstract. In DGPS/INS integrated navigation system based on carrier phase measurements, it is hard to resolve integer ambiguity using GPS only measurements when GPS signals become available after outages. The method that INS position aids GPS integer ambiguity resolution can solve this problem effectively. In this paper, taking Ambiguity Dilution of Precision（ADOP） as an indication, the relation between INS position accuracy and the successful probability of GPS ambiguity resolution has been researched under two integration scenarios： loose and tight coupling integration. The result showed that INS with medium or low precision can effectively lower ADOP value and improve precision and reliability of GPS ambiguity resolution.