Estimation and analysis of GNSS receiver differential code bias in Southeast Asia using a new method

Abstract

The receiver differential code bias (DCB) is one of the main errors in GNSS navigation and positioning as well as ionospheric monitoring. In this paper, we present a new method to estimate the receiver differential code bias (DCB) using Multi-GNSS observations in Southeast Asia. Different from the traditional method by using ionosphere modeling or Global ionospheric map (GIM), the total electron content (TEC) of station in the new method is estimated directly together with the receiver DCB. The data of one year with 34 stations were used to evaluate the performance of the presented method. The results show a good agreement between our estimated receiver DCBs and the MGEX DCB products and the RMS of eight types of GNSS receiver DCB are mostly less than 1ns with respect to the MGEX products. Finally, the stability of GNSS receiver DCB was analysed for eight stations located in Southeast Asia as examples. The result indicates that those stations were relatively stable with mostly less than 1ns of STD of receiver DCB. Moreover, no evidence of latitudinal and receiver type dependencies of the stability of receiver DCB for those selected stations was found.