摘要
针对中长基线参考站间宽巷模糊度固定较慢的问题,提出了一种基于BDS-3四频信号(B1I/B2a/B3I/B1C)的分步无电离层(SIF)单历元解算方法。利用BDS-3四频超宽巷/宽巷模糊度易于固定的优点,通过无几何无电离层(GIF)法固定两个超宽巷模糊度,将模糊度固定的双差载波观测值与待求的宽巷观测值组成无电离层模型消除电离层延迟的影响。分析和试验结果表明,与宽巷组合(WLC)法相比,SIF法不受电离层延迟误差的影响,且宽巷模糊度解算过程中受观测值噪声的影响远小于GIF法;在104 km基线实验中通过SIF法单历元固定宽巷模糊度的成功率为100%,且偏差基本在±0.2周内。综合来看,SIF法在大气误差较小和较大时均有较好的性能,可应用于中长基线及长基线参考站间的宽巷模糊度快速可靠固定。
Aiming at the problems that wide-lane ambiguity between medium-long range reference stations is fixed slowly, a stepwise ionosphere-free(SIF) single-epoch algorithm based on BDS-3 four-frequency signals(B1 I/B2 a/B3 I/B1 C) is proposed. Using the advantage that four-frequency extra-wide-lane/wide-lane ambiguities of BDS-3 are easy to be fixed, first fix the two extra-wide-lane ambiguities by the geometry-free and ionosphere-free(GIF) method, then, the double-difference carrier observation with fixed ambiguity and the wide lane observation to be obtained form a non-ionospheric model to eliminate the influence of ionospheric delay. Analysis and experimental results show that compared with the wide-lane combination(WLC) method, the SIF method is not affected by the ionospheric delay error, and the influence of the observation noise during the wide-lane ambiguity resolution process is much smaller than that of the GIF method;in the 104 km baseline experiment, the success rate of fixing wide-lane ambiguity in a single epoch by SIF method was 100%,and the deviation was basically within ±0.2 cycle. On the whole, the SIF method has better performance when the atmospheric error is small and large, and it can be used to quickly and reliably fix the wide-lane ambiguity between medium-long range and long range reference stations.
作者
张宸浩
潘树国
高旺
何璇
彭佳伟
ZHANG Chenhao;PAN Shuguo;GAO Wang;HE Xuan;PENG Jiawei(School of Instrument Science and Engineering,Southeast University,Nanjing 210096,China)
出处
《测绘科学》
CSCD
北大核心
2022年第1期76-83,共8页
Science of Surveying and Mapping
基金
国家自然科学基金项目(41904022,41774027)。
