GPS/Galileo FCB估计方法与数值分析  

GPS/Galileo FCB estimation methods and numerical analysis

作　　者：刘学习 姜卫平[2] 郑南山[1] 张克非 LIU Xuexi;JIANG Weiping;ZHENG Nanshan;ZHANG Kefei(School of Environment Science and Spatial Informatics,China University of Mining and Technology,Xuzhou,Jiangsu 221116,China;GNSS Research Center,Wuhan University,Wuhan 430079,China)

机构地区：[1]中国矿业大学环境与测绘学院,江苏徐州221116 [2]武汉大学卫星导航定位技术研究中心,武汉430079

出　　处：《导航定位学报》2024年第1期1-11,共11页Journal of Navigation and Positioning

基　　金：国家自然科学基金项目(42304015);江苏省自然科学基金项目(BK20231087);大地测量与地球动力学国家重点实验室开放基金项目(SKLGED2024-3-7)。

摘　　要：为了进一步研究不同分析中心精密产品对全球卫星导航系统(GNSS)精密单点定位(PPP)中卫星端硬件延迟小数周偏差(FCB)的影响,对GNSSFCB估计算法进行分析:介绍GNSSFCB估计的流程和算法;然后采用2021年共51d分布在全球221个测站的数据估计全球定位系统(GPS)、伽利略卫星导航系统(Galileo)卫星端的FCB;最后分析使用德国地学中心(GBM)和欧洲定轨中心(COD)精密产品对GNSS FCB结果的影响。研究结果表明:使用不同分析中心的精密产品对与宽巷(WL)FCB没有影响,并且在51 d之内,绝大部分GPS卫星的WL FCB非常稳定,几乎都在0.1周(1周载波长度=1倍波长)之内,所有Galileo卫星的WLFCB均在0.05周以内;对于窄巷(NL)FCB,大多数GPS和Galileo卫星的CODNLFCB和GBMNLFCB数值在0.1周之内变化,少部分卫星变化在0.15周左右,GPSNLFCB残差分布在±0.15和±0.25周以内的占比超过91.6%和94.2%,而GalileoNLFCB残差分布在±0.15和±0.25周以内的占比超过92.6%和95.1%;整体看来,Galileo卫星的WL和NL FCB要优于GPS,COD NL FCB要优于GBM NLFCB,采用GBM改变策略之后得到的NLFCB要优于改变策略之前的NLFCB,且所有改变策略之后的GalileoNL FCB均为0,而大部分GPS卫星的NL FCB并不为0。In order to further study the effect of precise products from different analysis centers on the fractional cycle bias(FCB)of satellite hardware delay in precise point positioning(PPP)for global navigation satellite system(GNSS),the paper analyzed GPS/Galileo FCB estimation methods:the process and algorithm of GNSS FCB estimation were introduced in detail;and the satellite FCB of the global positioning system(GPS)and Galileo navigation satellite system(Galileo)were estimated using the data of 221 stations distributed in the world in a total of 51 days in 2021;finally,the impact of using the precise products from the GeoForschungsZentrum(GFZ(GBM))and Center for Orbit Determination in Europe(CODE(COD))on GNSS FCB results was analyzed.Results showed that precise products from different analysis centers would have no effect on wide-lane(WL)FCB,and within 51 days,the WL FCB of the majority of GPS satellites would be very stable,almost all within 0.1 cycles,while the WL FCB for all Galileo satellites would be within 0.05 cycles;moreover,for NL FCB,the COD NL FCB and GBM NL FCB of most GPS and Galileo satellites would vary within 0.1 cycles,and a few satellites change around 0.15 cycles,meanwhile,the proportion of GPS NL FCB residuals distributed within±0.15 and±0.25 cycles could exceed 91.6%and 94.2%,and the proportion of Galileo NL FCB residuals distributed within±0.15 and±0.25 cycles could exceed 92.6%and 95.1%;in general,the WL and NL FCB of Galileo would be better than that of GPS;COD NL FCB would be better than GBM NL FCB,and the NL FCB obtained after GBM strategy change the would be better than that before strategy change,and after changing strategy,the Galileo NL FCB would be zero,while the NL FCB of most GPS satellites would be not zero.

关 键 词：精密单点定位(PPP) 全球卫星导航系统(GNSS) 小数周偏差(FCB) 参数估计 精度评估 

分 类 号：P227[天文地球—大地测量学与测量工程] P228.4[天文地球—测绘科学与技术]