首页|GPS/Galileo FCB估计方法与数值分析

GPS/Galileo FCB估计方法与数值分析

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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 GNSS FCB 估计算法进行分析:介绍 GNSS FCB估计的流程和算法;然后采用 2021年共 51 d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 WL FCB均在 0.05 周以内;对于窄巷(NL)FCB,大多数 GPS和 Galileo卫星的 COD NL FCB和 GBM NL FCB数值在 0.1 周之内变化,少部分卫星变化在 0.15 周左右,GPS NL FCB残差分布在±0.15 和±0.25 周以内的占比超过 91.6%和 94.2%,而 Galileo NL FCB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 NL FCB,采用 GBM改变策略之后得到的 NL FCB要优于改变策略之前的 NL FCB,且所有改变策略之后的 Galileo NL FCB均为 0,而大部分GPS卫星的NL FCB并不为 0.
GPS/Galileo FCB estimation methods and numerical analysis
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.

precise point positioning(PPP)global navigation satellite system(GNSS)fractional cycle bias(FCB)parameter estimationaccuracy evaluation

刘学习、姜卫平、郑南山、张克非

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中国矿业大学 环境与测绘学院,江苏 徐州 221116

武汉大学 卫星导航定位技术研究中心,武汉 430079

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

国家自然科学基金项目江苏省自然科学基金项目大地测量与地球动力学国家重点实验室开放基金项目

42304015BK20231087SKLGED2024-3-7

2024

10.16547/j.cnki.10-1096.20240102

导航定位学报

导航定位学报

CSTPCD北大核心
影响因子：0.72
ISSN：
年,卷(期)：2024.12(1)
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