BDS三频GIF组合非显著周跳探测与修复

Detection and Repair of the Non-significant Cycle Slip in BDS Triple-frequencies GIF Combination

GNSS周跳探测与修复的准确性受复杂观测环境影响。本文针对BDS三频无几何无电离层(geometry and ionosphere free,GIF)组合不敏感周跳组合及周跳漏检问题,提出了进一步附加2个历元间二次差的电离层残差组合(second-order time-difference phase ionospheric residual,STPIR)对GIF修复观测进行周跳检验。在磁暴发生期间BDS实测数据的周跳探测和修复结果表明,该方法能够探测与修复BDS非差观测值中所有可能发生的周跳组合。

The accuracy of BDS triple-frequency cycle slip detection and repair is influenced by the observation environment.Three linear independence geometry-free and ionosphere-free combinations (GIF) have been widely applied detect and then to repair the GNSS cycle-slip,but for some special cycle-slip combinations or when observations with bad observation environment,the cycle-slip repair may be invalidated.For this,we further introduce the STPIR combination to the GIF model to detect and repair the cycle-slip,and use the second-order time-difference of the STPIR to further reduce the influence of the observational noise.The proposed method was applied to detect cycle slips in BDS observations during a magnetic storm.It shows that the proposed method can be used to detect and repair all possible cycle-slip combinations of BDS un-differenced observations.