北斗三号卫星多频多通道差分码偏差估计与分析

doi:10.11947/j.AGCS.2021.20200504

摘要/Abstract

摘要： 差分码偏差（DCB）是电离层建模与导航定位授时的主要误差源，北斗多频多通道信号衍生出一系列新的DCB。本文首先分析了北斗三号卫星的码观测值组合及可估的DCB类型，建立了北斗三号卫星多频码偏差估计的数学模型，利用IGS实测数据首次估计得到了22种不同类型的北斗DCB。在此基础上，全面比较分析了各类DCB的内符合精度、外符合精度及月稳定度。结果表明，北斗三号卫星各类DCB的闭合差基本都在0.2 ns以内，具有较好的内符合精度；估计结果与中科院（CAS）、德国宇航中心（DLR）提供的DCB产品具有一致性，与CAS的6种DCB偏差基本在0.1 ns以内，与DLR的4种DCB偏差基本在0.2 ns以内；由于误差传递的影响，通过线性转换得到DCB值的精度和可靠性不及DCB直接估计量；北斗三号卫星各类DCB的月平均标准差为0.083 ns，具有较好的中长期稳定性；相较于北斗二号卫星，北斗三号卫星的DCB稳定性相对更优。

关键词: 北斗三号全球导航卫星系统, 多频多通道, 差分码偏差, 一致性, 稳定性

Abstract: Differential code bias (DCB) is one of the major errors in ionospheric modeling, satellite navigation, positioning, and timing. A new series of DCBs is derived from BDS multi-frequency and multi-channel signals. Firstly, this paper analyzes the code observation combination and estimable DCB type for BDS-3, establishes the mathematical model of multi-frequency and multi-channel DCB estimation, and estimates more than 20 types of DCB by using IGS data. On this basis, the precision, accuracy, and monthly stability of various DCBs are compared and analyzed comprehensively. The results indicate that the closure errors of BDS-3 DCBs are basically within 0.2 ns, which shows good precision. The estimated results have a good agreement with the DCB products provided by CAS and DLR. Six types of DCB differences with CAS are basically within 0.1 ns. Four types of DCB differences with DLR are basically within 0.2 ns. Due to the influence of error propagation, the accuracy and reliability of DCB obtained by linear transformation are not as good as DCB estimated directly. The monthly mean STD of BDS-3 DCBs is 0.083 ns, showing good medium- and long- term stability. Compared with that of BDS-2, the DCB stability of BDS-3 is relatively better.

Key words: BDS-3, multi-frequency and multi-channel, differential code bias, consistency, stability

中图分类号:

P228

邓远帆, 郭斐, 张小红, 刘万科. 北斗三号卫星多频多通道差分码偏差估计与分析[J]. 测绘学报, 2021, 50(4): 448-456.

DENG Yuanfan, GUO Fei, ZHANG Xiaohong, LIU Wanke. Estimation and analysis of the multi-frequency and multi-channel DCB for BDS-3[J]. Acta Geodaetica et Cartographica Sinica, 2021, 50(4): 448-456.

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