全球定位系统2024，Vol.49Issue(3)：80-86,7.DOI:10.12265/j.gnss.2023191
GNSS广播ERP参数评估
Research on evaluation of GNSS system broadcast ERP parameters
摘要
Abstract
Modernized navigation messages of Global Navigation Satellite Systems like BDS,GPS,QZSS and IRNSS include earth rotation parameters(ERPs),namely the pole coordinates and UT-UTC(ΔUT1).Broadcast ERPs are primarily needed for space-borne GNSS applications that require transformations between earth-fixed and inertial reference frames like satellite precise orbit determination as well as earth to the moon navigation.Based on the International GNSS Service(IGS),we obtained broadcast ERP data for BDS,GPS,QZSS,and IRNSS from January 1,2022 to June 5,2023.Evaluate the discontinuity of broadcast ERP,the results show that for GPS and IRNSS,the discontinuity of polar motion is 0.9 to 1.4 mas,and the ΔUT1 discontinuity is about 0.2 ms.The discontinuity of polar motion is about 0.1 mas,and the ΔUT1 discontinuity is about 0.02 ms for QZSS.The discontinuity of BDS polar motion is about 4.5 mas,and the ΔUT1 discontinuity is about 1.3 ms.Compared with the external reference 14C04 sequence of the International Earth Rotation and Reference System Service(IERS),the QZSS polar motion error is about 0.6 mas,and the ΔUT1 error is about 0.27 ms.The polar motion of GPS and IRNSS is about 2.4 mas.For ΔUT1,the GPS error is about 0.36 ms,the IRNSS is about 10.47 ms,which is a significant difference.BDS polar motion error is about 6 mas,and ΔUT1 error is about 1.2 ms.Due to less frequent update intervals,compared with GPS,BDS performs worse by a factor of 1.5 and 2.5 for polar motion and ΔUT1 error,respectively.关键词
地球自转参数(ERP)/GNSS/极移/ΔUT1/不连续性/误差Key words
earth rotation parameters(ERP)/GNSS/pole coordinates/ΔUT1/discontinuity/error分类
天文与地球科学引用本文复制引用
张奋,阮仁桂,贾小林,朱永兴,王龙..GNSS广播ERP参数评估[J].全球定位系统,2024,49(3):80-86,7.基金项目
国家自然科学基金(41874041,42074025) （41874041,42074025）
