Comparative analysis of broadcast ephemeris accuracy before and after the opening of BDS-3 system
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摘要: 北斗三号卫星导航系统(BDS-3)开通已一年有余，通过研究2019-08—2021-08共2 a的北斗卫星导航系统(BDS)广播星历数据，采用事后精密星历对北斗二号卫星导航系统(BDS-2)和BDS-3卫星的轨道、钟差和空间信号测距误差(SISRE)进行分析. 结果表明：BDS-3系统开通后，卫星轨道精度比BDS-2提升明显，径向(R)误差均方根(RMS)值从0.87 m左右提升至优于0.23 m，精度提升约74%，3D误差RMS值从1.63 m以内提升到优于0.75 m，精度提升约54%；氢原子钟和铷原子钟精度相当，BDS-3钟差误差RMS值精度提升与BDS-2提升基本相同，精度提升约1 ns；SISRE精度比对中，BDS-2 SISRE的RMS值从0.9 m提升到0.7 m，BDS-3从0.8 m提升到0.5 m. 综合比较，BDS-3系统性能提升较大.
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关键词:
- 北斗卫星导航系统(BDS) /
- 广播星历 /
- 精密星历 /
- 轨道误差 /
- 钟差 /
- 空间信号测距误差 (SISRE)
Abstract: BeiDou-3 Navigation Satellite System (BDS-3) has been in operation for more than one year. By studying the BeiDou Navigation Satellite System (BDS) broadcast ephemeris data from August 2019 to August 2021, the orbit, clock error and signal-inspace ranging error (SISRE) of BeiDou Navigation Satellite (regional) System (BDS-2) and BDS-3 satellites are analyzed by using the post precision ephemeris. The results show that after the BDS-3 system is opened, the satellite orbit accuracy is significantly higher than that of BDS-2. The radial error root mean square (RMS) value is improved from about 0.87 m to better than 0.23 m, the accuracy is improved by about 74%, and the 3D error RMS value is improved from less than 1.63 m to better than 0.75 m, the accuracy is improved by about 54%; The accuracy of hydrogen atomic clock and rubidium atomic clock is the same. The accuracy improvement of RMS value of BDS-3 clock error is basically the same as that of BDS-2, with an accuracy improvement of about 1 ns; In SISRE accuracy comparison, the RMS value of BDS-2 SISRE is increased from 0.9 m to 0.7 m, and BDS-3 SISRE is increased from 0.8 m to 0.5 m. through comprehensive comparison, the performance of BDS-3 system is greatly improved -
表 1 各类型卫星
$ \alpha $ 和$\;\beta$ 的取值卫星类型 贡献因子值 $\alpha $ $\;\beta $ BDS (GEO/IGSO) 0.99 127 BDS (MEO) 0.98 54 
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表 3 各卫星数据使用率
% PRN 轨道 钟差 开通前 开通后 开通前 开通后 C01 99.93 94.03 91.45 93.10 C02 99.98 100.00 90.96 93.76 C03 99.95 100.00 91.20 93.40 C04 99.90 99.60 90.67 93.09 C05 99.93 100.00 90.93 93.17 C06 100.00 100.00 91.17 93.26 C07 100.00 100.00 91.40 93.35 C08 99.98 100.00 90.93 93.03 C09 99.98 100.00 91.17 93.04 C10 100.00 100.00 91.03 93.63 C11 85.99 85.44 90.96 92.91 C12 83.55 86.33 90.53 92.70 C13 100.00 100.00 91.19 93.31 C14 84.25 86.15 90.55 91.60 C16 100.00 100.00 90.83 93.21 C19 99.80 99.87 91.37 93.38 C20 99.75 99.95 90.88 93.35 C21 99.64 100.00 90.46 93.30 C22 99.73 100.00 91.24 93.35 C23 99.83 99.92 91.23 93.38 C24 99.85 100.00 91.10 93.38 C25 99.76 99.92 91.09 93.07 C26 99.69 99.92 90.67 93.35 C27 99.47 100.00 91.68 93.38 C28 99.47 100.00 90.72 93.35 C29 99.81 100.00 91.25 93.35 C30 99.61 99.97 90.96 93.04 C32 99.79 99.92 90.33 92.85 C33 99.97 99.84 91.08 93.04 C34 99.84 99.95 91.26 93.35 C35 99.74 100.00 91.45 93.35 C36 99.84 99.77 89.97 93.07 C37 100.00 100.00 90.30 93.04
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表 4 BDS-3开通前后1 a BDS卫星轨道误差RMS统计结果
m PRN 卫星类型 开通前RMS 开通后RMS A C R 3D A C R 3D C01 BDS-2 GEO 6.76 2.01 0.92 7.11 7.13 1.86 1.01 7.44 C02 2.95 2.04 0.72 3.66 2.44 1.80 0.56 3.08 C03 3.59 2.21 1.09 4.35 3.80 1.69 0.65 4.21 C04 4.61 2.28 0.91 5.22 6.74 2.21 0.94 7.15 C05 3.22 2.54 1.11 4.24 4.34 1.92 0.74 4.80 C06 BDS-2 IGSO 1.37 1.32 0.84 2.08 1.76 1.18 0.70 2.23 C07 1.96 1.37 0.85 2.54 1.28 1.28 0.48 1.87 C08 1.77 1.85 0.64 2.64 1.85 1.73 0.50 2.59 C09 1.28 1.40 0.87 2.09 1.46 1.08 0.55 1.90 C10 1.40 1.22 0.73 2.00 1.21 1.16 0.47 1.74 C13 1.48 1.32 0.63 2.08 1.21 1.16 0.52 1.75 C16 1.20 1.26 0.85 1.94 1.24 1.18 0.64 1.83 C11 BDS-2 MEO 2.51 0.92 0.66 2.75 2.34 0.73 0.62 2.52 C12 3.04 1.15 1.18 3.46 2.60 0.76 0.66 2.79 C14 2.67 1.53 0.71 3.15 2.57 1.04 1.00 2.95 C19 BDS-3 MEO 0.47 0.60 0.35 0.84 0.38 0.41 0.18 0.59 C20 0.99 1.00 0.81 1.62 0.38 0.39 0.21 0.59 C21 0.52 0.73 0.50 1.02 0.34 0.39 0.16 0.54 C22 0.74 0.82 1.34 1.74 0.34 0.39 0.16 0.54 C23 0.63 0.57 0.39 0.93 0.38 0.39 0.17 0.57 C24 0.72 0.60 0.47 1.05 0.36 0.40 0.15 0.56 C25 0.93 0.66 0.71 1.35 0.33 0.36 0.18 0.52 C26 0.71 0.53 0.86 1.23 0.38 0.45 0.19 0.62 C27 0.66 0.66 0.86 1.27 0.31 0.33 0.16 0.48 C28 0.73 0.62 0.48 1.07 0.32 0.36 0.16 0.51 C29 0.55 0.52 0.48 0.90 0.32 0.35 0.16 0.50 C30 0.58 0.78 0.70 1.20 0.32 0.33 0.16 0.49 C32 0.46 0.66 0.46 0.93 0.37 0.39 0.17 0.56 C33 0.37 0.46 0.18 0.61 0.58 0.40 0.22 0.74 C34 0.61 0.68 0.38 0.99 0.33 0.34 0.16 0.50 C35 0.50 0.60 0.48 0.92 0.32 0.35 0.16 0.50 C36 0.55 0.52 0.63 0.98 0.34 0.44 0.15 0.58 C37 0.63 0.58 0.43 0.96 0.36 0.39 0.16 0.55
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