Estimation and Characteristic Analysis of GPS Differential Code Bias at the Receiver Side

The existing researches rarely systematically consider the characteristics of the differential code bias (DCB) parameters at the receiver side. In this contribution, the DCB valuations at the receiver end for a single station were obtained by a multi-frequency PPP model with receiver DCB parameters using raw observations. The multi-frequency measured data of 275 stations in the MGEX tracking network were selected to analyze the stability and reliability of DCB valuations at the receiver end. The results show that single-day solutions of DCB12 and DCB13 parameters at the receiver end based on the multi-frequency PPP model tend to be stable after convergence, and no large jumps for all single-day solutions exist on consecutive days. Additionally, the DCB12 and DCB13 valuations at the receiver side are dependent on receiver type. The differences among DCB valuations of different types of receivers are significant. In contrast, DCB valuations of two types of receivers of Septentrio manufacturers show no difference, and the difference between the two is within 1.0 ns. The DCB valuations at the receiver end obtained by the multi-frequency PPP model keep consistent with the receiver DCB products provided by CAS. The reliability of receiver DCB12 valuations is better than that of receiver DCB13 valuations.