High-rate Doppler-aided cycle slip detection and repair method for low-cost single-frequency receivers
High-rate Doppler-aided cycle slip detection and repair method for low-cost single-frequency receivers
复制标题
低成本单频接收机的高速多普勒辅助周跳检测与修复方法
DOI：
10.1007/s10291-020-00993-0
复制
发表时间：
2020-06-08
期刊：
影响因子：
4.9
通讯作者：
Yuan, Hong
中科院分区：
文献类型：
--
作者：
Zhao, Jiaojiao;Hernandez-Pajares, Manuel;Yuan, Hong
载波相位周跳可能是全球导航卫星系统（GNSS）精确定位中的一个重要误差源。在这种情况下，周跳可能严重损害定位精度和可靠性，特别是对于单频接收机，其不提供不同频率的同时测量以生成用于周跳检测的有效线性组合。我们介绍了一种高速率多普勒辅助周跳检测和修复（DACS-DR）方法来检测和修复单频低成本GNSS接收机中的周跳，这得益于高速率多普勒测量的可用性。系统地分析了在不同采样率下，由多普勒观测得到的载波相位时差减去载波相位变化后的残差的分布。在低成本和高端接收器之间进一步执行比较。考虑到接收机输出的失锁指示（LLI）也能反映周跳的情况，本文还基于实验接收机讨论了LLI的可靠性。基于这些分析，DACS-DR方法用于浮动PPP实验，数据集是在困难的情况下收集的：高纬度城市峡谷（冰岛北方阿克雷里，2017年12月），电离层闪烁强烈。结果表明，收敛时间，定位误差，和重新收敛事件的数量都显着减少与所提出的方法。此外，定位误差的水平和垂直方向的RMS值分别改善了44.2%和21.2%。
Carrier phase cycle slips can be an important source of error in precise Global Navigation Satellite System (GNSS) positioning. In such cases, cycle slips can seriously compromise the positioning accuracy and reliability, especially for single-frequency receivers, which do not provide simultaneous measurements at different frequencies to generate effective linear combinations for cycle slip detection. We introduce a high-rate Doppler-aided cycle slips detection and repair (DACS-DR) method to detect and repair cycle slips in single-frequency low-cost GNSS receivers, which benefit from the availability of high-rate Doppler measurements. The distributions of the residuals of the time-differenced carrier phase minus the carrier phase change derived from Doppler observations are analyzed systematically under different sampling rates. A comparison is further performed between the low-cost and high-end receivers. Considering that the loss of lock indicator (LLI) output by receivers can also reflect the condition of cycle slips, the reliability of the LLI is also discussed based on our experimental receiver. Based on these analyses, the DACS-DR method is used in a float-PPP experiment with a data set collected under a difficult situation: a high-latitude urban canyon (Akureyry, northern Iceland, Dec. 2017) with intense ionospheric scintillation. The results demonstrate that the convergence time, positioning errors, and the number of re-convergence events are all significantly reduced with the proposed method. Furthermore, the RMS values of the positioning errors in the horizontal and vertical directions are improved by 44.2% and 21.2%, respectively.