Research on Multi-path Error Characteristics of DFMC BDSBAS

In order to verify the conformity of the multi-path error characteristics of the BeiDou Satellite Based Augmentation System with the International Civil Aviation Organization Dual-Frequency Multi-Constellation Satellite-Based Augmentation System multipath error model, this paper compares the signal characteristics of BDS, GPS and Galileo systems, and then proposes a DFMC BDSBAS multi-path error characteristic verification method based on the multi-path model requirements of ICAO DFMC SBAS. Finally, its conformity is verified by aviation antenna group delay test and measured data. The results show that: (1) Dual-frequency signal characteristics of BDS, GPS and GALILEO are basically consistent; (2) The aerial antenna used in the test meets the requirements of DO-373 antenna group delay characteristics; (3) The change trend of multi-path error curve of BDS is basically consistent with that of GPS and GALILEO. The multi-path error characteristics of DFMC BDSBAS meet the requirements of multi-path model of ICAO.