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北斗卫星反射信号岸基海面高度反演精度的评估

张云 赵乐久 孟婉婷 秦瑾 盛志超 杨树瑚

张云,赵乐久,孟婉婷,等. 北斗卫星反射信号岸基海面高度反演精度的评估[J]. 北京航空航天大学学报,2023,49(5):999-1008 doi: 10.13700/j.bh.1001-5965.2021.0412
引用本文: 张云,赵乐久,孟婉婷,等. 北斗卫星反射信号岸基海面高度反演精度的评估[J]. 北京航空航天大学学报,2023,49(5):999-1008 doi: 10.13700/j.bh.1001-5965.2021.0412
ZHANG Y,ZHAO L J,MENG W T,et al. Evaluation of accuracy of shore-based sea surface height inversion based on Beidou satellite reflected signals[J]. Journal of Beijing University of Aeronautics and Astronautics,2023,49(5):999-1008 (in Chinese) doi: 10.13700/j.bh.1001-5965.2021.0412
Citation: ZHANG Y,ZHAO L J,MENG W T,et al. Evaluation of accuracy of shore-based sea surface height inversion based on Beidou satellite reflected signals[J]. Journal of Beijing University of Aeronautics and Astronautics,2023,49(5):999-1008 (in Chinese) doi: 10.13700/j.bh.1001-5965.2021.0412

北斗卫星反射信号岸基海面高度反演精度的评估

doi: 10.13700/j.bh.1001-5965.2021.0412
基金项目: 国家自然科学基金(41871325);国家重点研发计划(87654)
详细信息
    通讯作者:

    E-mail: shyang@shou.edu.cn

  • 中图分类号: V221+.3;TB553

Evaluation of accuracy of shore-based sea surface height inversion based on Beidou satellite reflected signals

Funds: National Natural Science Foundation of China (41871325); National Key R & D Program of China (87654)
More Information
  • 摘要:

    北斗B3I信号作为新一代民用码,相较于北斗B1I信号,具有码速率更高、码片宽度更窄等特点。目前,利用北斗卫星导航系统反射测量(BDS-R)技术对北斗B3I信号进行海面高度反演的研究较少。基于此,在2020年9月7日山东威海附近海域,接收B1I/B3I双频段的直射和反射信号数据,分别采用时延-多普勒(DDM)和载波相位延迟进行岸基海面高度反演。通过实测的同比数据验证反演精度,在信号特性和测高方法2个维度评估北斗B1I和B3I信号海面高度反演的性能。结果显示:采用DDM测高方法,B1I频段和B3I频段的反演结果与实测数据的平均绝对误差和均方根误差分别为1.18 m、1.48 m和0.84 m、1.10 m;采用载波相位延迟测高方法,B1I频段和B3I频段的反演结果与实测数据的平均绝对误差和均方根误差分别为0.12 m、0.15 m和0.10 m、0.12 m。由于信号特性差异,B3I频段的DDM测高结果相较于B1I频段的测高结果精度提高了28%;B3I频段的载波相位延迟测高结果精度略优于B1I频段,两者差异不明显。实验对北斗B1I和B3I信号特性和测高方法导致的反演精度差异的评估,证明了B1I和B3I反射信号均能适用于海面高度反演的需求。

     

  • 图 1  岸基BDS-R海面高度反演示意图

    Figure 1.  Schematic diagram of shore-based BDS-R sea surface height retrieval

    图 2  B1I频段和B3I频段生成的DDM相关功率图

    Figure 2.  DDM correlation power diagram generated by B1I and B3I frequency bands

    图 3  B1I频段和B3I频段DDM多普勒维度为0的时延一维功率谱切片

    Figure 3.  Slice of B1I and B3I frequency bands DDM time-delay one-dimensional power spectrum when Doppler is 0

    图 4  岸基BDS-R DDM海面高度反演方法流程

    Figure 4.  Flow chart of shore-based BDS-R DDM sea surface height retrieval method

    图 5  B3I频段直射和反射I、Q相关支路波形

    Figure 5.  Waveforms of I and Q related branches of direct and reflection in B3I frequency band

    图 6  B3I频段码延迟和相位延迟对比

    Figure 6.  Comparison of code delay and phase delay in B3I frequency band

    图 7  岸基BDS-R载波相位延迟海面高度反演方法流程

    Figure 7.  Flow chart of shore-based BDS-R carrier phase delay sea surface height retrieval method

    图 8  实验场景

    Figure 8.  Experimental scene

    图 9  实验卫星天顶图和卫星仰角图

    Figure 9.  Experimental satellite zenith and elevation angle

    图 10  镜面反射点移动轨迹

    Figure 10.  Movement trajectory of specular reflection points

    图 11  2020年9月7日08:18—10:41(LT)时刻C10、C13、C19、C22卫星B1I和B3I频段DDM反演与同比数据对比结果

    Figure 11.  Comparison of B1I and B3I frequency bands DDM retrieval results and measured heights of C10, C13, C19 and C22 satellites at 08:18—10:40 September 7, 2020 (LT)

    图 12  2020年9月7日08:55—10:07(LT)时刻B1I和B3I频段载波相位延迟反演与同比数据对比结果

    Figure 12.  Comparison of B1I and B3I frequency bands carrier phase delay retrieval results and measureed heights at 08:55—10:07 September 7, 2020 (LT)

    表  1  北斗B1I和B3I信号对比

    Table  1.   Comparison of Beidou B1I signals and B3I signals

    北斗信号标称载波频率/MHz带宽/MHz波长/m调制方式伪码速率/MHz码片个数码片宽度/μs
    北斗B1I信号1561.0984.0920.192BPSK2.04620460.489
    北斗B3I信号1268.5220.460.237BPSK10.23102300.098
    下载: 导出CSV

    表  2  实验相关参数

    Table  2.   Experimental parameter

    天线架设经纬度反射天线倾角/(°)天线架杆长度/m天线方位角/(°)直射/反射天线垂直高度差/m
    37°32′2.4839″ N,122°2′44.1544″ E425.452000.379
    下载: 导出CSV

    表  3  实验风速数据

    Table  3.   Experimental wind speed data

    采集时间风速/(m·s−1瞬时风向
    08:137.1西北
    08:317.9西北
    08:507西北
    09:119.5西北
    09:279.8西北
    09:468.2西北
    10:0010.8西北
    10:1710西北
    10:3311.7西北
    下载: 导出CSV

    表  4  DDM测高方法B1I和B3I频段卫星精度分析

    Table  4.   DDM height measuring method for B1I and B3I frequency bands accuracy analysis

    卫星号卫星高度角/(°)MAE/mRMSE/m
    B1IB3IB1IB3I
    C1059.1~47.21.160.881.411.14
    C1349.3~49.91.511.021.621.19
    C1945.9~50.41.490.841.821.03
    C2251.0~67.70.860.711.080.86
    全体数据集1.180.841.481.10
    下载: 导出CSV

    表  5  载波相位延迟测高方法B1I和B3I频段卫星精度分析

    Table  5.   Carrier phase delay height measuring method for B1I and B3I frequency bands accuracy analysis m

    反演频段卫星号MAERMSE
    B1I全体数据集0.120.15
    B3I全体数据集0.100.12
    下载: 导出CSV
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出版历程
  • 收稿日期:  2021-07-20
  • 录用日期:  2021-10-11
  • 网络出版日期:  2022-02-23
  • 整期出版日期:  2023-05-31

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