Performance Analysis of BDS-3 Klobuchar Model

Since July 2020, the global Beidou Navigation Satellite System (BDS-3) satellites provide new B1C and B2a public navigation service signals, as well as the legacy B1I and B3I signals. With the opening of BDS-3 global service, the service area of the broadcast Klobuchar model (BDSKlob) parameters expanded from China and parts of the Asia-Pacific region to the whole world. In this study, the differences between the GPS Klobuchar model (GPSKlob) and the BDSKlob is comprehensively analyzed. The data since the opening of the BDS-3 is collected, and the results show that: (1) the average correction accuracy of the BDSKlob model in global-scale is about 4.61–5.75 TECU; (2) the correction abnormalities of the modified BDSKlob model in high latitude region has been improved significantly; (3) the interchangeability between the BDSKlob and the GPSKlob model algorithm has been verified, is initially verified.