一种顾及电离层约束的非差周跳的实时探测与修复方法

提出了一种顾及电离层约束的非差周跳实时探测与修复方法。通过构造3个线性无关的组合观测量,按逐级模糊度确定的思路,分别对超宽巷、宽巷和窄巷进行探测与修复;然后联合三步的探测结果,将周跳恢复到原始载波值上。在宽巷组合上进行了改进,将宽巷波长放大了5.34倍(GPS为3.4倍),由于窄巷波长较短需考虑电离层的影响,对不敏感周跳组合引入电离层残差法辅助窄巷的探测与修复。实验结果表明,该方法能够有效地进行周跳的实时探测和修复。

A Real-Time Undifferenced Cycle Slip Detection and Repair Method with Consideration to Ionosphere Constraints

This paper presents a real-time undifferenced cycle slip detection and repair method with consideration to ionosphere constraints. The method constructs three linearly independent observations. The combinations were di-vided into extra-wide lane ( EWL) , wide lane ( WL) and narrow lane ( NL) like TCAR( Three Carrier Ambiguity Resolution) . Cycle slips on the combinations were determined sequentially in three cascaded steps. And then the cycle slips on the original carrier phase observation can be uniquely identified. The wavelength of the wide lane magnified 5.43 times ( GPS, 3.4 times) than traditional MW combination. The first and second step employs the geometry-free and Ionosphere-free MW combination and the residual ionospheric delay is ignored. But the residual ionospheric delay must be considered in narrow lane because of its short wavelength. To particular case, the iono-sphere residual method assists the narrow lane of cycle slip detection. Results indicated that the approach can ef-fectively detect and correct cycle slip in real time.