A Single-Difference Multipath Hemispherical Map for Multipath Mitigation in BDS-2/BDS-3 Short Baseline Positioning

The BeiDou Navigation Satellite System (BDS) features a heterogeneous constellation so that it is difficult to mitigate the multipath in coordinate-domain. Therefore, mitigating observation-domain becomes more important. Sidereal filtering commonly used for mitigation, which needs calculate orbit repeat time of each satellite. However, poses computational challenge and damages integrity at end model. this paper proposes single-difference model based on hemispherical map (SD-MHM) BDS-2/BDS-3 short baseline. proposed method converted from double-difference residuals residuals, not restricted by pivot satellite transformation. Moreover, takes elevation azimuth angles as independent variables SD-MHM overcomes unequal observation some satellites does require specific hardware. experimental results show reduces root mean square positioning errors 56.4%, 63.9%, 67.4% east, north, vertical directions; moreover, contributes an increase baseline accuracy 1.97 0.84 mm. has significant advantages mitigation compared with advanced sidereal method. Besides, also excellent correction capability data period than seven days. provides universal strategy BDS mitigation.