北斗/GNSS多频率码偏差估计与分析OA北大核心CSTPCD

This paper introduces the methods and steps for estimating multi-GNSS multi-frequency code biases and validates the effectiveness of estimating inter-frequency code biases using a multi-GNSS ionospheric mod-eling approach.We compute daily solutions for various code biases using MGEX network observations from January 2019 to July 2023.We further analyze the accuracy of various code biases.The results indicate that the multi-GNSS multi-frequency OSBs calculated in this paper exhibit an average weekly stability ranging from 0.07 to 0.26 ns.Among them,the average weekly stability of BDS-2 and BDS-3 multi-frequency OSBs are 0.17 to 0.26 ns and 0.13 to 0.21 ns,respectively.The consistency of various types of DCBs with products from DLR and CAS can be maintained within 0.3 ns.This research is not dependent on external post-processing products and can calculate code biases with both a rapid turnaround time and high precision.