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首页> 外文期刊>Advances in space research >Early analysis of precise orbit and clock offset determination for the satellites of the global BeiDou-3 system
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Early analysis of precise orbit and clock offset determination for the satellites of the global BeiDou-3 system

机译：全球北斗三号系统卫星的精确轨道和时钟偏移确定的早期分析

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Eight new-generation BeiDou satellites (BeiDou-3) have been launched into Medium Earth Orbit (MEO), allowing for global coverage since March 2018, and they are equipped with new hydrogen atomic clocks and updated rubidium clocks. Firstly, we analyzed the signals for the carrier-to-noise-density ratio (C/NO) and pseudorange multipath (MP) by using international GNSS (Global Navigation Satellite System) Monitoring and Assessment System (iGMAS) station data, and found that B 1 C has a lower C/NO, and B2a has the same level of C/NO as the B1I and B3I signals. For pseudorange multipath, compared with the BeiDou-2 satellites, the obvious systematic variation of MP scatters related to the elevation angle is greatly improved for the BeiDou-3 and BeiDou-3e satellites signals. For the signals of the BeiDou-3 satellites, the order of the Root Mean Square (RMS) values of multipath and noise is B3I B1I B2a B1C. Then, the comparison of the precise orbit determination and clock offset determination for the BeiDou-2, BeiDou-3, and BeiDou-3 experimental (BeiDou-3e) satellites was done by using 10 stations from iGMAS. The 3D precision of the 24 h orbit overlap is 24.55, 25.61, and 23.35 cm for the BeiDou-3, BeiDou-3e, and BeiDou-2 satellites, respectively. BeiDou-3 satellite has a comparable precision to that of the BeiDou-2 satellite. For the precision of clock offset estimation, the Standard Deviation (STD) of the BeiDou-3 MEO satellite is 0.350 ns, which is an improvement of 0.042 ns over that of the BeiDou-2 MEO satellite. The stabilities of the BeiDou-3 and BeiDou-3e onboard clocks are better than those of BeiDou-2 by factors of 2.84 and 1.61 at an averaging time of 1000 and 10,000 s, respectively. (C) 2018 COSPAR. Published by Elsevier Ltd. All rights reserved.
机译：自2018年3月以来，八颗新一代北斗卫星（BeiDou-3）已发射到中地球轨道（MEO）中，可实现全球覆盖，并配备了新的氢原子钟和更新的rub钟。首先，我们使用国际GNSS（全球导航卫星系统）监视和评估系统（iGMAS）台站数据分析了载波噪声密度比（C / NO）和伪距多径（MP）信号，发现B 1 C的C / NO较低，B2a的C / NO电平与B1I和B3I信号相同。对于伪距多径，与BeiDou-2卫星相比，与BeiDou-3和BeiDou-3e卫星信号相比，与仰角相关的MP散射的明显系统变化得到了极大的改善。对于北斗3号卫星的信号，多径和噪声的均方根（RMS）值的顺序为B3I

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