固定GEO卫星为参考的BDS与GPS紧组合定位方法  

A fixed positioning method for BDS and GPS tight combination under fixed reference GEO

作　　者：金俭俭 高成发[1] 高旺[1] 陈波[1] JIN Jianjian;GAO Chengfa;GAO Wang;CHEN Bo(School of Transportation,Southeast University,Nanjing 211189,China)

机构地区：[1]东南大学交通学院

出　　处：《测绘科学》2019年第11期1-8,共8页Science of Surveying and Mapping

摘　　要：针对BDS二代系统与GPS没有重叠的频率,受其影响,差分系统间偏差DISB无法事先标定的问题,该文提出了固定BDS的GEO卫星为参考星的策略,详细推导了BDS与GPS短基线紧组合相对定位模型,分析了BDS-B1、BDS-B2与GPS-L1、GPS-L2频点的相同接收机与不同接收机间DISB值的稳定性。结果表明:即使是相同类型的接收机,BDS与GPS差分系统间偏差亦不为0。当BDS系统参考星固定为GEO卫星时,载波与伪距DISB值随时间变化稳定,可以事先进行标定。最后利用不同高度截止角对遮挡环境进行模拟,短基线实验结果表明,当卫星数目较少时,紧组合模型相较于传统的松组合,定位精度有20%以上的提升,并且使用改正DISB后的紧组合模型,能够显著缩短模糊度的初始化时间,从而提高在高遮挡环境下定位的性能以及可用性。In view of the problem that the differential inter-system deviation DISB can not be calibrated in advance between the BDS second-generation system and the GPS,a strategy for fixed BDS GEO satellites as reference stars was proposed in this paper.Detailed derivation of a tightly-combined relative positioning model of BDS and GPS short baselines was performed,and the stability of the DISB value between the same receiver and different receivers of BDS-B1,BDS-B2 and GPS-L1,GPS-L2 frequencies was analyzed.The results showed that the deviation between BDS and GPS differential systems was not zero even for the same type of receiver.When the BDS system reference star was fixed to the GEO satellite,the carrier and pseudo-range DISB values changed with time and could be calibrated in advance.Finally,the shielding environment was simulated by using different height cutoff angles.The results of the short baseline experiment showed that when the number of satellites was small,the tight combination model had a positioning accuracy of more than 20% compared to the traditional loose combination,and using the tight combination model after correcting the DISB could significantly shorten the initialization time of the ambiguity,thereby improving the performance and usability of positioning in a high occlusion environment.

关 键 词：GPS BDS 紧组合 短基线 差分系统间偏差 

分 类 号：P228[天文地球—大地测量学与测量工程]