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Enhancing BDS-3 precise time transfer with DCB modelling
Measurement ( IF 3.364 ) Pub Date : 2021-01-02 , DOI: 10.1016/j.measurement.2020.108641
Weijin Qin; Yulong Ge; Zhe Zhang; Haiyan Yang; Hang Su; Xuhai Yang

This article is the first report of BDS-3 differential code bias (DCB) correction models. Satellite differential code biases (SDCBs) were regarded as a source of error; if there was no correction, the quality of the GNSS Position & Navigation & Timing service deteriorated. As a newly built global system, the BDS-3 satellite broadcasted B1I, B3I, B1C and B2a signals. To fully exploit all the BDS-3 signals, DCB correction models related to multiple Dual-Frequency (DF) Ionosphere-Free (IF) combinations were developed for BDS-3 application. Two prevailing global navigation satellite system positioning technologies, namely, standard point positioning (SPP) and precise point positioning (PPP), were utilized to validate the efficacy of the DCB parameters provided by the Multi-GNSS Experiment (MGEX). Our numerical analyses clarified how the DCB model performed when it was applied to positioning and time transfer events under the B1C&B3I, B1I&B2a, B1C&B2a cases. With the use of DCB correction in three combinations, the positioning accuracy and frequency stability were significantly improved. The E, N and U position accuracies of the ondcb scheme compared to those of the offdcb scheme were enhanced in the range of 39.51–86.24%, 35.44–78.64% and 41.84–78.64%, respectively. In particular, we observed that the long-term stability of the time link was obviously better than the short-term stability. The stability percentages were improved by at least 3%, and some were improved by up to 66.5%. The frequency stability obtained by B1I&B3I is equivalent to that obtained by B1C&B3I and B1I&B2a. Finally, all the statistics indicate that the B1C&B2a combination recommended as the optimal option is applicable to time transfer communities. The result agrees with our expectation that the appropriate modelling of DCB is vital, which allows for more precise positioning and a stable time link.



中文翻译:

通过DCB建模增强BDS-3的精确时间传递

本文是BDS-3差分代码偏差(DCB)校正模型的第一份报告。卫星差分代码偏差(SDCB)被认为是错误的根源。如果不进行更正,则GNSS位置,导航和计时服务的质量会下降。作为新建的全球系统,BDS-3卫星广播了B1I,B3I,B1C和B2a信号。为了充分利用所有BDS-3信号,针对BDS-3应用开发了与多种双频(DF)无电离层(IF)组合相关的DCB校正模型。两种流行的全球导航卫星系统定位技术,即标准点定位(SPP)和精确点定位(PPP),用于验证Multi-GNSS实验(MGEX)提供的DCB参数的有效性。我们的数值分析阐明了DCB模型在B1C&B3I,B1I&B2a,B1C&B2a情况下应用于定位和时间转移事件时的表现。通过在三种组合中使用DCB校正,可以显着提高定位精度和频率稳定性。与offdcb方案相比,ondcb方案的E,N和U位置精度分别提高了39.51–86.24%,35.44–78.64%和41.84–78.64%。尤其是,我们观察到时间链接的长期稳定性明显好于短期稳定性。稳定性百分比至少提高了3%,有的提高了66.5%。B1I&B3I获得的频率稳定性与B1C&B3I和B1I&B2a获得的频率稳定性相同。最后,所有统计数据均表明,推荐的B1C&B2a组合作为最佳选择适用于时间转移社区。结果符合我们的期望,即适当的DCB建模至关重要,它可以实现更精确的定位和稳定的时间链接。

更新日期:2021-01-13
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