BDSBAS定位性能初步分析

Preliminary Analysis of BDSBAS Positioning Performance

BDSBAS通过播发B1C、B2a增强信号,向中国及周边地区用户提供符合ICAO标准的单频服务和双频多星座服务。利用BDSBAS播发的改正信息,选取iGMAS国内4个监测站数据,开展了定位分析。试验结果表明:星基增强BDS双频定位水平精度为1.7 m,垂直精度为2.6 m。相比基本导航BDS双频定位,3个方向分别提升了8%、19%和19%,三维方向提升了17%;星基增强GPS单频定位相对于基本导航GPS单频定位,3个方向分别提升了23%、43%和37%,三维方向提升了37%;星基增强GPS双频定位相对于基本导航GPS双频定位,水平方向精度相当,高程精度提升明显,3个方向分别提升了4%、13%和24%。

BDSBAS provides the single frequency(SF) service through B1 C signal and the dual-frequency multi-constellation(DFMC) service through B2 a signal for users in China and surrounding areas, in accordance with the International Civil Aviation Organization(ICAO) standard. The data of domestic monitoring stations which are from international GNSS Monitoring & Assessment System are selected to analyze positioning performance with correction information which is broadcasted by BASBAS. The results show that the horizontal accuracy of BDSBAS dual-frequency positioning is 1.7 m, and vertical accuracy is 2.6 m. Compared with those of the basic navigation BDS dual-frequency positioning, the accuracies in three directions are increased by 8%, 19% and 19%, and that in three-dimensional direction is increased by 17%. Compared with those of basic navigation GPS single-frequency positioning, those of satellite-based augmentation GPS single-frequency positioning are increased by 23%, 43% and 37%, respectively, and that in three-dimensional direction is increased by 37%. Compared with the accuracy of basic navigation GPS dual-frequency positioning, the accuracy of satellite-based augmentation GPS dual-frequency positioning in the horizontal direction is similar, but the vertical accuracy of satellite-based augmentation GPS is significantly improved, the accuracy in three directions is increased by 4%, 13% and 24%.