Estimation and analysis of Galileo differential code biases
Estimation and analysis of Galileo differential code biases
复制标题
Galileo差分码偏差的估计和分析
DOI：
10.1007/s00190-016-0962-1
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发表时间：
2017-03-01
影响因子：
4.4
通讯作者：
Huo, Xingliang
中科院分区：
文献类型：
--
作者：
Li, Min;Yuan, Yunbin;Huo, Xingliang
利用全球导航卫星系统（GNSS）的双频伪距观测对地球电离层进行传感时，卫星和接收机的差分码偏差（DCBs）是误差的主要来源之一。对于伽利略系统，关于卫星和接收机dcb的确定和特性分析的知识有限。为了更好地了解伽利略卫星和接收机的dcb特征，将IGGDCB （IGG，中国武汉大地测量与地球物理研究所）方法扩展到利用GPS和伽利略观测数据联合估算伽利略卫星和接收机的dcb。实验数据来自Multi-GNSS实验网络，时间为2013-2015年。因此，对伽利略卫星和接收机dcb在36个月期间的稳定性进行了伽利略系统当前状态的分析。基于iggdcb的伽利略卫星DCB估计值与德国航空航天中心（DLR）的DCB估计值在0.22 ns的水平上有很好的一致性。此外，IGGDCB和DLR算法在选定的时间跨度（标准差小于0.25 ns）内获得了伽利略卫星DCB估计的高度稳定性。在接收器硬件设备保持不变的情况下，伽利略接收器DCB估计值也相对稳定。还可以得出接收机DCB估计对固件版本的变化相当敏感，接收机天线类型对接收机DCB的影响不大。
When sensing the Earth's ionosphere using dual-frequency pseudorange observations of global navigation satellite systems (GNSS), the satellite and receiver differential code biases (DCBs) account for one of the main sources of error. For the Galileo system, limited knowledge is available about the determination and characteristic analysis of the satellite and receiver DCBs. To better understand the characteristics of satellite and receiver DCBs of Galileo, the IGGDCB (IGG, Institute of Geodesy and Geophysics, Wuhan, China) method is extended to estimate the satellite and receiver DCBs of Galileo, with the combined use of GPS and Galileo observations. The experimental data were collected from the Multi-GNSS Experiment network, covering the period of 2013-2015. The stability of both Galileo satellite and receiver DCBs over a time period of 36 months was thereby analyzed for the current state of the Galileo system. Good agreement of Galileo satellite DCBs is found between the IGGDCB-based DCB estimates and those from the German Aerospace Center (DLR), at the level of 0.22 ns. Moreover, high-level stability of the Galileo satellite DCB estimates is obtained over the selected time span (less than 0.25 ns in terms of standard deviation) by both IGGDCB and DLR algorithms. The Galileo receiver DCB estimates are also relatively stable for the case in which the receiver hardware device stays unchanged. It can also be concluded that the receiver DCB estimates are rather sensitive to the change of the firmware version and that the receiver antenna type has no great impact on receiver DCBs.