Wi-Fi辅助的城市中BDS定位完好性监测  

Wi-Fi Assisted BDS Positioning Integrity Monitoring in Urban Cities

作　　者：夏敬潮 汪善根[1] 金向农[1] 曾秋[1] XIA Jingchao;WANG Shan′gen;JIN Xiangnong;ZENG Qiu(School of Civil Engineering,Guangzhou University,Guangzhou 510006,China)

机构地区：[1]广州大学土木工程学院,广东广州510006

出　　处：《测绘与空间地理信息》2022年第5期15-17,23,共4页Geomatics & Spatial Information Technology

基　　金：广州市科技计划项目(202102020953);广东省省级科技计划项目(2020A1414040038);国家自然科学基金(41701190)资助。

摘　　要：接收机自主完好性监测通常是建立在冗余观测值的基础上,然而在城市复杂环境下,卫星信号易受高层建筑物的遮挡,观测到的卫星数量往往不足,为此,本文探讨了Wi-Fi辅助的北斗定位的完好性监测方法。Wi-Fi的辅助功能主要体现在它可以为接收机提供概略的位置信息,当只有4颗观测卫星时,可将单点定位结果与Wi-Fi定位结果进行比较,从而判断卫星定位结果的可用性;另外,当卫星坐标或者观测值出现异常时,无初始坐标的单点定位往往不能迭代出正确的结果,此时可在Wi-Fi定位结果的基础上作进一步的数据预处理,以剔除掉异常的卫星。Redundant BDS(BeiDou Navigation Satellite System)satellite observations should be recorded if Receiver Autonomous Integrity Monitoring(RAIM)technique is used.However,due to signals blocked by tall buildings in cities,the numbers of observed BDS satellites are not always enough for us to do the integrity monitoring work.In order to solve the problem mentioned above,a Wi-Fi assisted BDS positioning integrity monitoring method is proposed in this paper.The key role of Wi-Fi is to provide approximate coordinates of BDS receiver by Wi-Fi positioning.If there are only 4 BDS satellites in view,the result of standard point positioning can be compared with that of Wi-Fi positioning to check the usability of BDS;Moreover,the coordinates provided by Wi-Fi positioning could also be used for preprocessing if BDS standard point positioning is not able to get the right coordinates when there are gross errors in ephemerides or observations of BDS satellites.

关 键 词：WI-FI 北斗卫星导航系统 无线局域网 完好性 接收机自主完好性监测 

分 类 号：P228[天文地球—大地测量学与测量工程]