Real-time triple-frequency cycle slip detection and repair method under ionospheric disturbance validated with BDS data
Real-time triple-frequency cycle slip detection and repair method under ionospheric disturbance validated with BDS data
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北斗数据验证电离层扰动下实时三频周跳检测与修复方法
DOI：
10.1007/s10291-018-0727-9
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发表时间：
2018-04
期刊：
影响因子：
4.9
通讯作者：
Zhang Qinghua
中科院分区：
文献类型：
--
作者：
Zeng Tian;Sui Lifen;Xu Yangyin;Jia Xiaolin;Xiao Guorui;Tian Yuan;Zhang Qinghua
为了解决电离层扰动和低采样率条件下数据的实时周跳检测和修复问题，提出了一种利用三频组合的新方法。首先推导了用于周跳检测的GFIF载波相位组合和GFIF伪距-相位线性组合。将两种GFIF组合不能检测到的特殊滑移群分为两类，分别设计了三种附加的无几何（GF）线性组合来检测。在估计步骤中，两个GFIF组合和具有B3载波相位观测值的伪距减相位线性组合一起用于确定原始三个载波上的周跳。该策略首先在B3中寻找周跳，然后利用两个GFIF组合通过整数自举方法找到B1和B2周期。使用前一个历元的载波相位数据估计两个连续历元之间的电离层延迟变化，并用于补偿包含残余电离层变化的时间差分线性组合。然后，在验证步骤中，使用阈值判断准则和最小一范数准则来验证周跳候选，最终得到正确的周跳候选。模拟和真实的周跳的实测数据检验表明，即使在电离层扰动下，该方法仍能高可靠性地修复所有周跳。在观测条件差的情况下，最不敏感的周跳组合±（1，1，1）可能会出现几次失败的修复，但这些周跳是可以检测到的。
In order to resolve the real-time cycle slip detection and repair problem with the data under ionospheric disturbance and low sample rate, a new method is proposed by using triple-frequency combinations. First, the geometry-free and ionospheric-free (GFIF) carrier phase combination and then the GFIF pseudorange minus phase linear combination are derived for cycle slip detection. The special slip groups which cannot be discovered by the two GFIF combinations are divided into two types, and each of them is designed to be detected by using three additional geometry-free (GF) linear combinations. In the estimation step, the two GFIF combinations and the pseudorange minus phase linear combination with B3 carrier phase observations are used together to determinate the cycle slip on the original three carriers. The strategy is first to search B3 for cycle slips and then find the B1 and B2 cycles using the two GFIF combinations by integer bootstrapping method. The ionospheric delay variations between two consecutive epochs are estimated using the carrier phase data of the previous epochs and used for compensating time-differenced linear combinations that contain residual ionospheric variations. Then, in the validation step, both the criterions of threshold judgment and minimum one norm are used to validate the cycle slip candidates and finally get the correct one. The real-data tests with simulated and real cycle slips reveal that the new method can repair all cycle slips with high reliability even under ionospheric disturbance. Several failed repairs may occur with the most insensitive slip combinations ± (1, 1, 1) under bad observation conditions, but these cycle slips can be detected.
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