Estimate DCB of BDS Satellites Based on the Observations of GPS/BDS
In single frequency precise point positioning, satellite’s DCBs is one of the main factors impacting the positioning accuracy. In the consideration of BDS navigation system has not completed and the limited distribution of regional monitoring network, the
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Estimate DCB of BDS Satellites Based on the Observations of GPS/BDS Chuanjun Wei, Qin Zhang, Lihong Fan, Shuangcheng Zhang, Guanwen Huang and Kejie Chen
Abstract In single frequency precise point positioning, satellite’s DCBs is one of the main factors impacting the positioning accuracy. In the consideration of BDS navigation system has not completed and the limited distribution of regional monitoring network, these adverse condition make it is hard to estimate the DCBs accuracy. So put forward using GPS rice data to estimate the DCB of BDS satellite by make a global ionosphere model using the observations of GPS and BDS. In this paper the strategy of estimate the DCB of BDS satellite is discussed in detail. Further analysis showed that the stability of BDS satellite’s DCBs is about 0.15 ns at 1 month. In order to further validate the precision of DCB of BDS satellites from this strategy, used BDS single frequency observations to position with the correct of BDS satellite’s DCB or without it. Compared with no DCBs correction, single-frequency user’s positioning accuracy is improved from 47% to 63% by using DCBs correction from the algorithm.
Keywords BDS GPS Combined Solution Ionosphere Differential code bias
29.1 Introduction GNSS satellites and receivers transmitting and receiving navigation signals of different frequencies by different channels, but the time when the navigation signal generated by the different channels are not entirely consistent. The time delay
C. Wei (&) Q. Zhang L. Fan S. Zhang G. Huang College of Geology Engineering and Geomatics, Chang’an University, Xi’an 710054, China e-mail: [email protected] K. Chen GFZ German Reasearch Centre for Geosciences, Potsdam, Germany
J. Sun et al. (eds.), China Satellite Navigation Conference (CSNC) 2014 Proceedings: Volume II, Lecture Notes in Electrical Engineering 304, DOI: 10.1007/978-3-642-54743-0_29, Springer-Verlag Berlin Heidelberg 2014
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between different frequencies is called Differential Code Bias (DCB). Its size in a few nanoseconds to tens of nanoseconds. It is the biggest error source of using navigation observations to calculate the Total Electron Content (TEC) of the ionosphere. Meanwhile is one of the error sources navigation and positioning by single-frequency [1]. So obtain accurate DCB parameter is very critical for improving accuracy of calculate the total electron content of the ionosphere and the single-frequency user positioning. Currently internationally recognized GPS satellite DCB is provided by the IGS (International GNSS Service) ionospheric group, is the result of comprehensive processing by four joint ionosphere analysis center (IAAC) [2,3]. Most of them calculate satellites’ DCB parameters is through make a global ionospheric model. Because the BeiDou navigation system has not been completed,so the satellites and tracking stations is less, can not make a good global ionospheric modeling by a single system and thus a good estimate of BeiDou satellite DCB parameters. At pres
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