摘要
广播星历在位置、导航和时间服务上起重要作用,探讨北斗二号(BDS-2)和北斗三号(BDS-3)的广播星历非常重要。本研究以欧洲定轨中心(COD)、德国地球科学研究中心(GFZ)和武汉大学(WHU)三个国际全球导航卫星系统服务(IGS)分析中心的高精度产品为基准,比较了2022年全年BDS-2和BDS-3广播星历的轨道误差、钟差误差和空间信号测距误差(SISRE),并进行了误差相关性分析。实验结果表明:对于中圆轨道(MEO)卫星,BDS-3广播星历的期龄优于BDS-2;天线相位中心改正(PCO)对BDS-3广播星历轨道精度的提升优于BDS-2;BDS-2与BDS-3广播星历的轨道误差在切向(A)、法向(C)和径向(R)上的均方根(RMS)分别为3.32、1.00、0.53 m和0.42、0.30、0.08 m。对于钟差误差,BDS-2和BDS-3的RMS值分别为1.99和1.69 ns。BDS卫星在轨道切向误差和轨道径向误差(A-R)以及轨道径向误差和钟差误差(R-V)上存在较为明显的相关性,且BDS-2卫星的误差相关性大于BDS-3。BDS-3和BDS-2卫星SISRE的RMS分别为0.53和0.79 m。
Broadcast ephemeris is pivotal in positioning,navigation and timing services.Therefore,it is crucial to analyze and compare the broadcast ephemeris between BDS-2 and BDS-3.By using the precision orbit and clock products sourced from the International GNSS Service(IGS)analysis centers such as Center for Orbit Determination in Europe(COD),GeoForschungsZentrum(GFZ)and Wuhan University(WHU)as references,a comprehensive evaluation and a comparative study were conducted on the orbit errors,clock errors,errors correlation and signal-in-space range errors(SISRE)of both BDS-2 and BDS-3 throughout 2022.For medium earth orbit(MEO)satellites,the broadcast ephemeris of BDS-3 has better data ages compared to BDS-2.The improvement of BDS-3 broadcast ephemeris orbit accuracy by the antenna phase center offset(PCO)correction is better than that of BDS-2.The root mean square(RMS)values of orbit errors in the along(A),cross(C)and radial(R)directions for BDS-3 are 0.42,0.30 and 0.08 m respectively,while those for BDS-2 are 3.32,1.00 and 0.53 m.In terms of clock errors,the RMS value for BDS-3 is 1.69 ns and it is 1.99 ns for BDS-2.Furthermore,a pronounced correlation is observed between orbit along errors and orbit radial errors(A-R),as well as between orbit radial errors and clock errors(R-V)for BDS satellites.The errors correlation is more pronounced in BDS-2 compared to BDS-3 satellites.The RMS values of SISRE for BDS-3 and BDS-2 satellites are 0.53 and 0.79 m respectively.
作者
董正华
张松林
DONG Zhenghua;ZHANG Songlin(College of Surveying and Geo-informatics,Tongji University,Shanghai 200092,China)
出处
《山东科技大学学报(自然科学版)》
北大核心
2025年第1期65-81,共17页
Journal of Shandong University of Science and Technology(Natural Science)
基金
上海市自然科学基金项目(19ZR1459700)
国家重点研发计划项目(2017YFB0502700)。
