BDS空间信号的连续性和可用性评估  

Continuity and availability assessment of BDS signal in space

作　　者：马下平[1] 张奇超 贺小星 严丽 秦永彪 冯超 MA Xiaping;ZHANG Qichao;HE Xiaoxing;YAN Li;QIN Yongbiao;FENG Chao(School of Geomatics,Xi’an University of Science and Technology,Xi’an 710054,China;School of Environment and Spatial Informatics,Jiangxi University of Science and Technology,Ganzhou,Jiangxi 341000,China;Engineering Research Center for Seismic Disaster Prevention and Engineering Geological Disaster Detection of Jiangxi Province(Earthquake Administration of Jiangxi Province),Nanchang 330013,China;HeBei Water Conservancy Engineering Bureau Group Limited,Shijiazhuang 050021,China)

机构地区：[1]西安科技大学测绘科学与技术学院,西安710054 [2]江西理工大学土木与测绘工程学院,江西赣州341000 [3]江西省防震减灾与工程地质灾害探测工程研究中心(江西省地震局),南昌330013 [4]河北省水利工程局集团有限公司,石家庄050021

出　　处：《导航定位学报》2023年第2期21-27,共7页Journal of Navigation and Positioning

基　　金：国家重点研究发展计划项目(2016YFB0502102);国家自然科学基金项目(41904171,42104023);上海市空间导航与定位技术重点实验室项目(201913);江西理工大学高层次人才科研启动项目(205200100564);江西数字国土重点实验室开放基金项目(DLLJ202203)。

摘　　要：为了及时评估北斗卫星导航系统(BDS)的空间信号(SIS)可用性和连续性,采用2020-10-01至2021-10-01共1 a的BDS广播星历数据,对BDS中的地球静止轨道卫星(GEO)、倾斜地球同步轨道卫星(IGSO)和中圆地球轨道卫星(MEO)3类卫星进行了可用性和连续性评估。结果表明:3类卫星的单星可用性最优为0.993,平均可用性达到0.991,但也存在如C07、C14号卫星的可用性未达到预期标准(0.98)的现象;SIS的连续性评估中,除个别卫星未达到规范的标准要求外,指数模型和滑窗算法计算的GEO卫星达到0.995,IGSO和MEO均达到0.998;指数模型计算的BDS中GEO、IGSO和MEO卫星的平均连续性分别为0.99729、0.99926、0.99958,而滑窗算法计算得到的平均连续性分别为0.99627、0.99917、0.99939,2种方法计算的BDS 3类卫星的整体连续性分别为0.99914和0.99885,指数模型较滑窗算法计算的SIS连续性偏差不大,与全球定位系统(GPS)相比存在一定差距,总体达到系统设计的指标要求。最后对比分析指数模型算法与滑窗算法,验证了指数模型可用于短期连续性统计。In order to evaluate the availability and continuity of signal in space(SIS)for BeiDou navigation satellite system(BDS)in time,the paper used the BDS broadcast ephemeris data of one year from October 1,2020 to October 1,2021 to analyze and evaluate the availability and continuity of three types of satellites including geostationary Earth orbit(GEO)satellites,inclined geo-synchronous orbits(IGSO)satellites and medium Earth orbit(MEO)satellites in BDS.Results showed that the single-satellite availability of the three types of satellites would be the best 0.993 and the average 0.991,however,the availability of some satellites,such as C07 and C14,did not reach the expected standard(0.98);in SIS continuity assessment,GEO satellites calculated by exponential model and sliding window algorithm reached 0.995 standard,IGSO and MEO both reached 0.998 standard,except that some satellites did not meet the standard requirements of the specification;the average continuity of GEO,IGSO and MEO satellites in the BDS calculated by the exponential model would be 0.99729,0.99926 and 0.99958,respectively,while the average continuity calculated by the sliding window algorithm would be 0.99627,0.99917 and 0.99939,respectively,and the overall continuity of the three types of satellites in the BDS calculated by the two methods woud be 0.99914 and 0.99885,respectively,indicating that the SIS continuity calculated by exponential model had little deviation from that by sliding window algorithm,which could meet the overall index requirements of the system design,although there woule be a certain gap compared with global positioning system(GPS).Finally,the exponential model algorithm and the sliding window algorithm were comparatively analyzed,and it was verified that the exponential model could be used for short-term continuity statistics.

关 键 词：北斗卫星导航系统(BDS) 可用性 连续性 计划中断 空间信号(SIS) 

分 类 号：P228[天文地球—大地测量学与测量工程]