Multipath Mitigation Method in GPS/BDS Deformation Monitoring Based on Observation Domain
In GNSS real-time high-precision monitoring, the multipath spatial correlation is weak, it is difficult to eliminate the multipath error by double difference, and the traditional method based on the sidereal filtering in the coordinate domain to mitigate multipath error of MEO satellite will no longer be applicable. Aiming at the above problem, this paper storage single difference observation residuals after ambiguity resolved in real-time baseline resolution, where storage residual information for 1d in GPS, BDS GEO, IGSO, and BDS MEO satellite for 7d. When the residual information database initialization is complete, each satellite multipath error sequence model will be established from the residual database by using the low-pass filter method, then mitigating multipath error of the corresponding satellite carrier phase observations in real time. The measured data show that, based on the mitigating multipath of observation domain, the real-time monitoring accuracy of the 3D position can be improved by about 50% after mitigating multipath error in real-time.
KeywordsGPS/BDS Deformation monitoring Multipath Observation domain
This work was supported by the “National key R&D project” (No. 2017YFD0700400, No. 2017YFD0700402) and Applied “Technology R&D special” (No. 2015B010131009).
- 1.Choi K (2004) Modified sidereal filtering: implications for high-rate GPS positioning. Geophys Res Lett 31(22):L22608Google Scholar
- 2.Axelrad P, Larson K, Jones B (2005) Use of the correct satellite repeat period to characterize and reduce site-specific multipath errors. In: Proceedings of the ION GNSSGoogle Scholar
- 8.Cui X, Yu Z, Tao B et al (2005) Generalized surveying adjustment. Press of Wuhan UniversityGoogle Scholar
- 9.Xue Z (2012) A study of key technology for dynamic deformation monitoring using GNSS. PLA Information Engineering University, ZhengzhouGoogle Scholar
- 10.Liu W, Ren J et al (2016) Accuracy assessment of BDS signal-in-space rangeerrors in 2013—2015. J Natl Univ Def Technol 38(3):1–6Google Scholar