Galileo三频非组合PPP相位小数偏差估计与模糊度解算  

Fractional cycle bias estimation and ambiguity resolution for Galileo triple-frequency uncombined PPP

作　　者：熊博文 潘林[1] 裴根 刘宁[1] 章湘粤 邓民 XIONG Bowen;PAN Lin;PEI Gen;LIU Ning;ZHANG Xiangyue;DENG Min(School of Geoscience and Info-Physics,Central South University,Changsha 410083,China)

机构地区：[1]中南大学地球科学与信息物理学院,长沙410083

出　　处：《全球定位系统》2024年第3期51-56,共6页Gnss World of China

基　　金：国家自然科学基金项目(41904030)。

摘　　要：欧洲的Galileo目前已经有28颗在轨可用卫星,具备全球精密定位能力,并且所有卫星均能够播发多频信号,多频信号融合有望进一步改善精密单点定位(precise point positioning,PPP)模糊度固定解性能.本文研究了Galileo三频非组合PPP相位小数偏差(fractional cycle bias,FCB)估计与模糊度解算(ambiguity resolution,AR)方法,并将其结果同双频非组合PPP模糊度固定解与浮点解结果进行了对比分析.结果表明:利用155个全球分布的地面跟踪站数据进行FCB估计,单个频率上的FCB估值序列标准差(standard deviation,STD)优于0.04周;双频PPP浮点解在E、N、U方向收敛时间分别为32.0 min、10.0 min、43.5 min,双频PPP固定解收敛时间分别减少到30.5 min、8.5 min、32.0 min,三频PPP固定解收敛时间分别进一步缩短到16.5 min、8.0 min、32.0 min.Galileo already has 28 in-orbit satellites,with precise positioning capabilities on a global scale.All Galileo satellites are capable of broadcasting multi-frequency signals,and multi-frequency integration is expected to further improve the performance of precise point positioning(PPP)ambiguity-fixed solutions.In this paper,the fractional cycle bias(FCB)estimation method and ambiguity resolution(AR)method for Galileo triple-frequency uncombined(UC)PPP are developed,and the derived results are compared with those of dual-frequency UC PPP ambiguity-fixed and ambiguity-float solutions.The results indicate that the standard deviation(STD)of UC FCB series on a single frequency is better than 0.04 cycles using datasets from 155 globally distributed ground tracking stations.The convergence time of Galileo dualfrequency PPP float solutions in the east,north and up directions is 32.0 min,10.0 min and 43.5 min,respectively,and the corresponding statistic of dual-frequency PPP fixed solutions is reduced to 30.5 min,8.5 min and 32.0 min in the three directions,respectively.The convergence time of triple-frequency PPP fixed solutions is further shortened to 16.5 min,8.0 min and 32.0 min in the three directions,respectively.

关 键 词：相位小数偏差(FCB) 模糊度解算(AR) 精密单点定位(PPP) 三频信号 GALILEO 

分 类 号：P228.4[天文地球—大地测量学与测量工程]