Modeling and Analysis of BDS-2 and BDS-3 Combined Precise Time and Frequency Transfer Considering Stochastic Models of Inter-System Bias
Modeling and Analysis of BDS-2 and BDS-3 Combined Precise Time and Frequency Transfer Considering Stochastic Models of Inter-System Bias
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考虑系统间偏差随机模型的BDS-2和BDS-3组合精密时频传递建模与分析
DOI：
10.3390/rs13040793
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发表时间：
2021-02
期刊：
影响因子：
5
通讯作者：
Na Cheng
中科院分区：
文献类型：
--
作者：
Guoqiang Jiao;Shuli Song;Qinming Chen;Chao Huang;Ke Su;Zhitao Wang;Na Cheng
北斗全球导航卫星系统（BDS）于2020年7月31日正式开始向全球用户提供定位，导航和定时（PNT）服务。BDS星座由区域导航卫星（BDS-2）和全球导航卫星（BDS-3）组成。由于BDS-2和BDS-3默认公务员信号（B1 I/B3 I）调制方式和特性的差异以及BDS-3新信号（B1 C/B2 a）的增加，接收端在接收和处理BDS-2和BDS-3信号时存在系统偏差，导致接收端BDS-2和BDS-3之间存在系统间偏差（ISB）。为了充分利用BDS，考虑ISB的影响，研究了BDS-2和BDS-3组合精确时间和频率传递。提出了四种ISB随机模型：忽略ISB（ISBNO）、ISBCV、随机游走过程（ISBRW）和白色噪声过程（ISBWN）。结果表明，通过对ISB的估计，可以统一接收机钟差数据，避免ISB推导出的数据混乱。ISBCV和ISBRW模型上级ISBWN模型。采用ISBNO、ISBCV、ISBRW和ISBWN的BDS-2和BDS-3联合精确时频传递，老信号钟差稳定度分别比单独BDS-2提高了20.18%、23.89%、23.96%和11.46%。对于新信号，增强分别为-50.77%，20.22%，17.53%和-3.69%。此外，ISBCV和ISBRW模型具有更好的频率传递稳定性。因此，我们建议BDS-2和BDS-3的最佳ISBCV或次优ISBRW模型在处理新旧信号时结合精确的时间和频率传输。
BeiDou global navigation satellite system (BDS) began to provide positioning, navigation, and timing (PNT) services to global users officially on 31 July, 2020. BDS constellations consist of regional (BDS-2) and global navigation satellites (BDS-3). Due to the difference of modulations and characteristics for the BDS-2 and BDS-3 default civil service signals (B1I/B3I) and the increase of new signals (B1C/B2a) for BDS-3, a systemically bias exists in the receiver-end when receiving and processing BDS-2 and BDS-3 signals, which leads to the inter-system bias (ISB) between BDS-2 and BDS-3 on the receiver side. To fully utilize BDS, the BDS-2 and BDS-3 combined precise time and frequency transfer are investigated considering the effect of the ISB. Four kinds of ISB stochastic models are presented, which are ignoring ISB (ISBNO), estimating ISB as random constant (ISBCV), random walk process (ISBRW), and white noise process (ISBWN). The results demonstrate that the datum of receiver clock offsets can be unified and the ISB deduced datum confusion can be avoided by estimating the ISB. The ISBCV and ISBRW models are superior to ISBWN. For the BDS-2 and BDS-3 combined precise time and frequency transfer using ISBNO, ISBCV, ISBRW, and ISBWN, the stability of clock differences of old signals can be enhanced by 20.18%, 23.89%, 23.96%, and 11.46% over BDS-2-only, respectively. For new signals, the enhancements are −50.77%, 20.22%, 17.53%, and −3.69%, respectively. Moreover, ISBCV and ISBRW models have the better frequency transfer stability. Consequently, we recommended the optimal ISBCV or suboptimal ISBRW model for BDS-2 and BDS-3 combined precise time and frequency transfer when processing the old as well as the new signals.
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