Abstract
Abstract. The differential code bias (DCB) of the Global Navigation Satellite System (GNSS) is an important error source in ionospheric modeling, which was generally estimated as constants every day. However, the receiver DCB may be changing due to the varying spatial environments and temperatures. In this paper, a method based on the global ionospheric map (GIM) of the Center for Orbit Determination in Europe (CODE) is presented to estimate the BeiDou Navigation Satellite System (BDS) receiver DCB with epoch-by-epoch estimates. The BDS receiver DCBs are analyzed from 30 d of Multi-GNSS Experiment observations. The comparison of estimated receiver DCB of BDS with the DCB provided by the German Aerospace Center (DLR) and the Chinese Academy of Sciences (CAS) shows a good agreement. The root-mean-square (rms) values of receiver DCB are 0.43 and 0.80 ns with respect to the DLR and CAS estimates, respectively. In terms of the intraday variability of receiver DCB, most of the receiver DCBs show relative stability within 1 d with the intraday standard deviation (SD) of less than 1 ns. However, larger fluctuations with more than 2 ns of intraday receiver DCB are found. Besides, the intraday stability of receiver DCB calculated by the third-generation BDS (BDS-3) and the second-generation BDS (BDS-2) observations is compared. The result shows that the intraday stability of BDS-3 receiver DCB is better than that of BDS-2 receiver DCB.
Highlights
The Global Positioning System (GPS) has been widely used as a useful tool in ionospheric monitoring and modeling (Hernández-Pajares et al, 1999; McCaffrey et al, 2017; Choi and Lee, 2018)
In order to better analyze the short-term variations of BeiDou Navigation Satellite System (BDS) receiver differential code bias (DCB) with the additional BDS-3 observations, this paper presents a DCB estimation method based on the global ionospheric map (GIM) by International GNSS Service (IGS) to estimate the BDS satellite and receiver DCB
The section begins by verifying the performance of the DCB estimation method, in which the satellite and receiver DCBs are compared with the DCB products by Chinese Academy of Sciences (CAS) and DLR
Summary
The Global Positioning System (GPS) has been widely used as a useful tool in ionospheric monitoring and modeling (Hernández-Pajares et al, 1999; McCaffrey et al, 2017; Choi and Lee, 2018). With its rapid development in recent years, the BeiDou Navigation Satellite System (BDS) begins to play an important role in global navigation, positioning, timing, and related applications (Su and Jin, 2019; Wang et al, 2019). Since the third-generation BeiDou Navigation Satellite System (BDS-3) provided global services at the end of 2018, more and more stations have been constructed to track the BDS signals. BDS can provide available observations globally for ionospheric modeling and research. The ionospheric total electron contents (TECs) can be obtained by the geometry-free linear combination of the dual-frequency Global Navigation Satellite System (GNSS) code observations, in which the differential code bias (DCB) is one of the main error terms to be estimated and removed (Sanz et al, 2017; Jin and Su, 2020).
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