地基北斗多信息海面高反射测量方法及精度分析OA

With the continuous development of the BeiDou Navigation Satellite System(BDS),sea surface height retrieval based on BDS Interferometric Reflectometry(BDS-IR)has attracted increasing attention.In this paper,we introduce sea surface height retrieval methods based on BDS SNR,triple-frequency carrier phase combinations,and single-frequency carrier pseudorange combinations,and also analyse the effects of signal types and signal frequencies on BDS-IR sea surface height retrieval.Using 120 days of BDS observation data from the AT01 station,the retrieval results show that the RMSE of the SNR-based retrieval model,triple-frequency carrier phase combination model,and single-frequency carrier pseudo range combination model are 0.199 m,0.189 m,and 0.204 m,respectively,with bias of 0.126 m,0.067 m,and 0.130 m,respectively.The SNR-based model performs the best,and the triple-frequency carrier phase combination model outperforms the single-frequency carrier pseudo range combination model.All BDS frequencies demonstrate high retrieval accuracy,with the RMSE ranging between 0.16 m and 0.19 m.Excluding the S7I,which provides an average of only 5.5 retrieval points per day,the other frequencies produce about 50 retrieval points per day,meeting the requirements for high-precision sea level monitoring.BDS-2 and BDS-3 exhibit comparable retrieval accuracy,with RMSE of 0.163 m and 0.185 m,respectively.This study will further improve GNSS-IR water level monitoring technology and provide accuracy support for future research.