中文摘要：

利用GNSS观测数据解算TEC的最大误差源是硬件延迟,包括卫星硬件延迟和接收机硬件延迟.在单接收机情况下,由于数据稀疏以及接收到的卫星信号时间不对齐等特点,已有的解算硬件延迟方法的求解结果往往不理想.在应用局域模式拟合方法和SCORE方法求解单接收机数据基础上,利用局域模型拟合法在电离层平静期拟合较准确的优点,提出一种联合改进方法,同时改正了SCORE方法解算过程中约束过强的缺点.通过利用GPStation-6接收机的GPS和BDS实际观测数据进行解算分析,验证了所提方法的有效性与准确性.

英文摘要：

The largest error sources of deriving TEC from GNSS observational data are Combined Differential Code Biases（CDCB） of instruments, including both satellite＇s DCB and receiver＇s DCB.Current existing methods for solving these DCBs are pretty suitable for multi-receiver cases, but under single receiver cases, they are not ideal for sparse ionospheric puncture points and timeunaligned signals among satellites. A joint method based on the local model fitting method and SCORE method is proposed to improve the solution for the single receiver case. The joint method takes advantage of the higher accuracy of local model fitting method during ionosphere quiet period,meanwhile it overcomes the disadvantage of strong restraint of SCORE method. By using of GPS and BDS data received by GP Station-6 receiver, the practical calculation proves the effectiveness and accuracy of the joint method.