Analysis of BDS ARAIM user receiver nominal bias

Beidou navigation satellite system (BDS) has provided open services for the most part of the Asia-Pacific region and plans to provide global service in 2020. In the future, it is necessary for BDS to support ARAIM. As an important parameter of ARAIM, the maximum nominal bias (Bnom) of BDS need to be determined. This paper aims to estimate the impact of nominal biases on ARAIM user performance of BDS. In particular, we focus on the signal deformation and the satellite group delay of BDS signal.