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北斗三号基本系统空间信号质量评估

宿晨庚 郭树人 刘旭楠 饶永南 王萌

引用本文: 宿晨庚, 郭树人, 刘旭楠, 饶永南, 王萌. 北斗三号基本系统空间信号质量评估[J]. 电子与信息学报, doi: 10.11999/JEIT190683 shu
Citation:  Chengeng SU, Shuren GUO, Xunan LIU, Yongnan RAO, Meng WANG. Signal Quality Assessment of BDS-3 Preliminary System[J]. Journal of Electronics and Information Technology, doi: 10.11999/JEIT190683 shu

北斗三号基本系统空间信号质量评估

    作者简介: 宿晨庚: 男,1988年生,助理研究员,研究方向为卫星导航信号设计与试验评估;
    郭树人: 男,1972年生,研究员,研究方向为卫星导航总体设计;
    刘旭楠: 女,1988年生,助理研究员,研究方向为卫星导航与遥感应用;
    饶永南: 男,1983年生,副研究员,研究方向为卫星导航信号测试与评估;
    王萌: 女,1993年生,博士生,研究方向为导航信号质量评估算法研究
    通讯作者: 宿晨庚,sucg@beidou.gov.cn
摘要: 卫星导航系统(GNSS)空间信号(SIS)质量直接影响了用户使用性能。北斗三号卫星不同于北斗二号卫星,将继续播发北斗二号老信号,同时新增播发B1C, B2a等新信号,多频多信号多分量的信号体制较北斗二号更为复杂,对导航卫星信号质量控制提出了较大挑战。2018年底北斗系统完成了18颗卫星组网,完成北斗三号基本系统建设并开始提供全球服务,有必要对北斗三号在轨卫星空间信号质量进行量化评估。传统空间信号质量评估方法侧重于单项的定性评估,而针对北斗三号复杂的信号体制,缺乏系统的、定量的分析结果。该文对标北斗系统接口控制文件(ICD),从功率特性、频域特性、时域特性、相关域特性和信号一致性等方面研究了不同参数配置对评估结果的影响,形成了一套面向新型调制方式和多频多分量复用信号的量化评估方法。基于40 m大口径天线的空间信号质量评估系统,对18颗MEO卫星进行了长时间监测跟踪和数据采集,首次对北斗三号卫星空间信号质量进行了全面量化评估。结果表明:北斗三号卫星空间信号质量良好,18颗MEO卫星一致性较好,符合ICD指标要求,可满足服务区内用户需求;评估方法可用于对后续导航卫星空间信号质量的量化评估。

English

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  • 图 1  评估内容

    图 2  不同带宽滤波后的S曲线偏差变化

    图 3  QMBOC自相关函数

    图 4  QMBOC信号S曲线

    图 5  数字畸变分析示意图

    图 6  B1C信号功率谱

    图 7  B2a信号功率谱

    图 8  北斗三号卫星B1频段地面接收功率

    图 9  B1Cd S曲线过零点偏差

    图 10  B1Cp S曲线过零点偏差

    图 11  B1C时域波形图

    图 12  B2a时域波形图

    表 1  北斗三号MEO卫星已公开信号格式

    频带信号分量中心频率(MHz)调制方式
    B1B1I1561.098BPSK(2)
    B1C1575.42QMBOC(6, 1, 1/11)
    B2B2a1176.45QPSK(10)
    B3B3I1268.52BPSK(10)
    下载: 导出CSV

    表 2  合成功率谱偏差均值(dB)

    信号M1M2M3M4M5M6M7M8M9
    B1C–0.2607–0.2052–0.2055–0.1863–0.2502–0.1209–0.0700–0.0572–0.3877
    B2a0.25780.30460.39120.08860.41540.40340.23210.33590.2825
    信号M10M11M12M13M14M15M16M17M18
    B1C–0.2323–0.4660–0.1585–0.0055–0.1714–0.3182–0.1586–0.0923–0.1014
    B2a0.32290.46140.38180.43570.32220.23510.14080.29560.2135
    下载: 导出CSV

    表 3  地面接收功率电平(dBW)

    信号M1M2M3M4M5M6M7M8M9
    B1C–155.305–154.415–155.156–155.620–155.423–154.715–155.581–155.570–154.734
    B2a–151.629–151.563–151.872–153.208–152.554–151.776–152.154–152.317–151.440
    信号M10M11M12M13M14M15M16M17M18
    B1C–154.750–155.363–155.324–154.974–154.951–156.105–155.029–156.162–155.5577
    B2a–151.353–152.373–152.183–151.097–151.748–153.673–152.034–153.691–152.0471
    下载: 导出CSV

    表 4  地面接收功率统计值(dBW)

    信号B1CB2a
    均值–154.38–152.15
    标准差0.470.74
    下载: 导出CSV

    表 5  信号各支路功率比

    信号分量M1M2M3M4M5M6M7M8M9
    B1Cp/B1Cd2.7072.8382.7942.7012.7692.7962.7552.7312.660
    B2ap/B2ad0.9970.9980.9910.9980.9950.9940.9990.9991.000
    信号M10M11M12M13M14M15M16M17M18
    B1Cp/B1Cd2.6572.6042.6802.7332.8342.5662.7522.6972.918
    B2ap/B2ad0.9970.9991.0000.9940.9980.9970.9971.0001.002
    下载: 导出CSV

    表 6  相关损耗分析结果(dB)

    信号分量M1M2M3M4M5M6M7M8M9
    B1Cp–0.381–0.491–0.441–0.373–0.444–0.415–0.050–0.202–0.165
    B1Cd–0.051–0.159–0.097–0.025–0.071–0.1230.1410.0440.182
    B1C–0.296–0.405–0.352–0.283–0.348–0.340–0.001–0.139–0.076
    B2ad0.0560.0390.0210.0510.0550.0540.0600.0420.053
    B2ap0.0550.0390.0190.0510.0580.0550.0610.0470.055
    B2a0.0550.0390.0200.0510.1130.0560.060.0440.054
    信号分量M10M11M12M13M14M15M16M17M18
    B1Cp–0.203–0.345–0.306–0.444–0.555–0.317–0.251–0.241–0.095
    B1Cd0.1430.1150.0140.024–0.0300.205–0.0320.0300.204
    B1C–0.114–0.227–0.224–0.323–0.42–0.183–0.195–0.171–0.018
    B2ad0.0520.0230.0550.0560.0530.0600.0550.0320.038
    B2ap0.0530.0250.0560.0580.0510.0590.0560.0330.038
    B2a0.0520.0240.0550.0570.0520.0590.0550.0320.038
    下载: 导出CSV

    表 7  相关损耗统计结果(dB)

    信号分量B1CpB1CdB1CB2adB2apB2a
    均值–0.320.03–0.230.050.050.05
    标准差0.140.110.130.010.010.02
    下载: 导出CSV

    表 8  S曲线偏差分析结果(ns)

    信号分量B1CdB1CpaB1Cp1B1Cp2B2adB2ap
    M10.0050.0060.1640.1380.1580.167
    M20.1480.1320.1070.1420.0690.074
    M30.1170.0670.0190.0750.0970.128
    M40.0520.0070.0560.0210.0800.080
    M50.1110.0600.2730.1860.0760.174
    M60.0530.0120.0830.0970.0900.084
    M70.1400.1480.0730.0700.0780.075
    M80.0520.110.1220.1120.0290.024
    M90.0050.0620.1340.1000.1880.182
    M100.1260.1200.1380.0640.1280.049
    M110.1110.1680.0360.0290.0260.027
    M120.0530.0050.1380.1130.0440.134
    M130.0500.0460.2770.1830.1190.128
    M140.0960.0510.1640.0830.0650.075
    M150.1670.1560.1770.0920.1350.142
    M160.0370.0250.2690.1660.1510.143
    M170.0070.0660.2470.1640.1290.126
    M180.0730.0110.1480.1320.1030.088
    下载: 导出CSV

    表 9  S曲线偏差统计结果

    信号分量B1CdB1CpaB1Cp1B1Cp2B2adB2ap
    均值0.080.070.150.100.100.10
    标准差0.050.050.080.050.040.05
    下载: 导出CSV

    表 10  正/负码片与理想码片长度偏差均值和最大值(ns)

    信号
    分量
    B1CpB1CdB2apB2ad
    均值最大值均值最大值均值最大值均值最大值
    M10.1013.3810.1173.2770.0242.714–0.0272.576
    M20.0553.6120.0163.390–0.0132.607–0.0332.676
    M30.1923.4120.0122.7730.0313.276–0.0323.092
    M40.0853.5400.0542.9140.0062.301–0.0232.113
    M50.0483.3960.1413.568–0.0012.2820.0532.256
    M60.1073.3590.0452.8050.0322.3300.0582.416
    M70.0183.3990.0553.4920.0122.145–0.0692.116
    M80.0813.2840.0222.9270.0152.939–0.0353.096
    M90.1123.3940.2062.6680.0542.244–0.0082.367
    M100.1013.4350.1672.8010.0622.2460.0132.407
    M110.1643.4150.3003.3380.0612.448–0.0362.274
    M120.0553.5680.1392.5970.0692.467–0.0842.340
    M130.1593.4360.1093.2120.0212.255–0.0482.336
    M140.0183.3330.0112.7460.1282.6630.0412.415
    M150.1883.6720.0493.080–0.0412.7270.0272.795
    M160.0953.3310.0102.702–0.0362.6780.0022.680
    M170.1732.6810.0082.7830.0312.2920.0362.474
    M180.1693.5420.0752.8970.0552.4860.0852.273
    下载: 导出CSV

    表 11  信号一致性测试结果(ns)

    信号分量B1Cd-B1CpB2ad-B2ap
    均值标准差均值标准差
    M12.26E-040.0769.96E-060.013
    M26.90E-050.0703.70E-050.012
    M32.03E-040.0796.74E-050.015
    M43.14E-040.0763.65E-050.016
    M55.40E-050.0711.43E-070.014
    M62.09E-040.0831.25E-050.013
    M75.30E-050.0891.82E-060.013
    M81.16E-040.0821.62E-050.014
    M92.60E-040.0989.06E-050.013
    M105.20E-050.0987.99E-060.013
    M111.30E-050.0858.59E-050.013
    M128.20E-050.0728.64E-050.015
    M131.15E-040.0815.67E-050.012
    M141.37E-040.0833.77E-050.013
    M151.98E-040.0987.98E-050.018
    M167.70E-050.0901.77E-050.014
    M171.93E-040.0763.67E-060.013
    M184.08E-040.0702.44E-050.012
    下载: 导出CSV
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  • 通讯作者:  宿晨庚, sucg@beidou.gov.cn
  • 收稿日期:  2019-09-04
  • 录用日期:  2020-03-31
  • 网络出版日期:  2020-05-12
通讯作者: 陈斌, bchen63@163.com
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