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基于半无码的P(Y)码自相关GNSS-R海面测高方法

樊梦文 张波 王峰

樊梦文, 张波, 王峰等 . 基于半无码的P(Y)码自相关GNSS-R海面测高方法[J]. 北京航空航天大学学报, 2019, 45(2): 398-404. doi: 10.13700/j.bh.1001-5965.2018.0294
引用本文: 樊梦文, 张波, 王峰等 . 基于半无码的P(Y)码自相关GNSS-R海面测高方法[J]. 北京航空航天大学学报, 2019, 45(2): 398-404. doi: 10.13700/j.bh.1001-5965.2018.0294
FAN Mengwen, ZHANG Bo, WANG Fenget al. Semi-codeless based P(Y) code autocorrelation GNSS-R sea surface altimetry method[J]. Journal of Beijing University of Aeronautics and Astronautics, 2019, 45(2): 398-404. doi: 10.13700/j.bh.1001-5965.2018.0294(in Chinese)
Citation: FAN Mengwen, ZHANG Bo, WANG Fenget al. Semi-codeless based P(Y) code autocorrelation GNSS-R sea surface altimetry method[J]. Journal of Beijing University of Aeronautics and Astronautics, 2019, 45(2): 398-404. doi: 10.13700/j.bh.1001-5965.2018.0294(in Chinese)

基于半无码的P(Y)码自相关GNSS-R海面测高方法

doi: 10.13700/j.bh.1001-5965.2018.0294
基金项目: 

国家自然科学基金 41774028

详细信息
    作者简介:

    樊梦文  女, 硕士研究生。主要研究方向:卫星导航及其在海洋遥感中的应用

    张波  男, 博士, 讲师。主要研究方向:扩频通信、卫星导航及其应用等

    王峰  男, 博士研究生。主要研究方向:导航卫星信号处理及其在海洋遥感中的应用

    通讯作者:

    张波, E-mail: bozhang@buaa.edu.cn

  • 中图分类号: P237

Semi-codeless based P(Y) code autocorrelation GNSS-R sea surface altimetry method

Funds: 

National Natural Science Foundation of China 41774028

More Information
  • 摘要:

    针对传统GPS C/A码延迟测高方法测高精度低和互相关测高方法时延波形信噪比低的问题,研究了基于半无码的P(Y)码自相关海面测高方法。首先,通过理论测高精度模型,对比分析了C/A码和P(Y)码的测高精度;然后,描述了L1、L2双频反射信号基于半无码的P(Y)码自相关处理架构,并论述了测高模型和L1、L2双频电离层时延误差修正方法;最后,利用模拟的L1、L2反射信号对比分析了基于半无码的P(Y)码自相关、C/A码自相关以及信号互相关方法的海面测高精度。结果表明:相比于C/A码自相关和信号互相关测高精度,基于半无码的P(Y)码自相关的测高精度分别提高了3.97倍和1.47倍。

     

  • 图 1  不同海面粗糙度条件下的GPS C/A码与P(Y)码反射信号归一化相关功率曲线

    Figure 1.  Curves of normalized correlation power of GPS C/A code and P(Y) code reflected signals under different sea surface roughness conditions

    图 2  不同ΔSNR条件下GPS C/A码与P(Y)码信号测高精度的比值随海面粗糙度的变化

    Figure 2.  Variation of ratio of GPS C/A code to P(Y) code signal altimetry precision with sea surface roughness under different ΔSNR conditions

    图 3  基于半无码的P(Y)码自相关测高方法框图

    Figure 3.  Block diagram of semi-codeless based P(Y) code autocorrelation altimetry method

    图 4  等时延信号相关结果示意图

    Figure 4.  Schematic diagram of iso-delay signal correlation results

    图 5  时延相关功率波形

    Figure 5.  Delay correlation power waveform

    图 6  3种测高方法处理模拟信号得到的高度测量结果

    Figure 6.  Analog signal processing results of three altimetry methods

    表  1  反射信号仿真参数

    Table  1.   Reflected signal simulation parameters

    参数 数值
    机载飞行高度/m 600
    卫星高度角/(°) 30
    采样频率/MHz 58
    相干积分时间/ms 1
    非相干累加次数 1 000
    风速/(m·s-1) 3
    下载: 导出CSV

    表  2  3种测高方法处理模拟信号得到的高度均方根误差

    Table  2.   Height mean square root errors obtained by analog signal processing using three altimetry methods

    测高方法 均方根误差/cm
    基于半无码的P(Y)码自相关测高 36.220 2
    信号互相关测高 89.373 9
    C/A码自相关测高 180.040 0
    下载: 导出CSV
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出版历程
  • 收稿日期:  2018-05-21
  • 录用日期:  2018-07-28
  • 刊出日期:  2019-02-20

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