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基于过零点斜率加窗解调的ACARS信号接收方法

路辉 张帆 张宇轩

路辉,张帆,张宇轩. 基于过零点斜率加窗解调的ACARS信号接收方法[J]. 北京航空航天大学学报,2024,50(3):716-728 doi: 10.13700/j.bh.1001-5965.2022.0292
引用本文: 路辉,张帆,张宇轩. 基于过零点斜率加窗解调的ACARS信号接收方法[J]. 北京航空航天大学学报,2024,50(3):716-728 doi: 10.13700/j.bh.1001-5965.2022.0292
LU H,ZHANG F,ZHANG Y X. ACARS signal receiving method based on window demodulation of zero-crossing slope[J]. Journal of Beijing University of Aeronautics and Astronautics,2024,50(3):716-728 (in Chinese) doi: 10.13700/j.bh.1001-5965.2022.0292
Citation: LU H,ZHANG F,ZHANG Y X. ACARS signal receiving method based on window demodulation of zero-crossing slope[J]. Journal of Beijing University of Aeronautics and Astronautics,2024,50(3):716-728 (in Chinese) doi: 10.13700/j.bh.1001-5965.2022.0292

基于过零点斜率加窗解调的ACARS信号接收方法

doi: 10.13700/j.bh.1001-5965.2022.0292
基金项目: 国家自然科学基金(61827901)
详细信息
    通讯作者:

    E-mail:mluhui@buaa.edu.cn

  • 中图分类号: V243.1;TP919.3+2

ACARS signal receiving method based on window demodulation of zero-crossing slope

Funds: National Natural Science Foundation of China (61827901)
More Information
  • 摘要:

    飞机通信寻址与报告系统(ACARS)允许飞机和地面站之间发送和接收报文,在保障飞行安全、实现空中交通管制等方面具有重要意义。通信链路的噪声和频偏是影响ACARS信号接收性能的关键因素。针对ACARS信号接收过程中的失真等问题,深入研究频偏、噪声等因素与ACARS报文接收性能之间的关系;在充分考虑噪声与多普勒频移等因素的基础上,提出基于过零点斜率加窗解调的ACARS信号接收方法,并从理论和仿真分析2方面探讨不同方法的抗频偏抗噪声能力;设计并搭建基于软件无线电平台的ACARS信号接收系统。通过对ACARS报文接收性能的仿真分析和真实报文接收性能的对比分析,表明所提方法在提升抗噪声和频偏能力、降低误码率等方面均具有优势。

     

  • 图 1  MSK相干解调流程框图

    Figure 1.  Block diagram of coherent MSK demodulation

    图 2  MSK差分解调流程框图

    Figure 2.  Block diagram of differential MSK demodulation

    图 3  MSK信号的过零点检测

    Figure 3.  Zero crossing detection for MSK signals

    图 4  ACARS下行信号接收流程框图

    Figure 4.  Block diagram of ACARS downstream signal reception

    图 5  截断信号填充

    Figure 5.  Truncated signal padding

    图 6  信号滤波处理

    Figure 6.  Signal filtering processing

    图 7  信号预处理

    Figure 7.  Signal preprocessing

    图 8  过零点斜率加窗解调流程框图

    Figure 8.  Block diagram of window demodulation of zero-crossing slope

    图 9  MSK调制信号

    Figure 9.  MSK modulation signal

    图 10  MSK信号解调仿真

    Figure 10.  Simulation of MSK signal demodulation

    图 11  不同窗口大小时MSK调制误码率对比

    Figure 11.  Comparison of bit error rates of MSK modulation at different window sizes

    图 12  不同解调方法时MSK调制误码率对比

    Figure 12.  Comparison of different demodulation methods

    图 13  ACARS信号接收平台

    Figure 13.  ACARS signal receiving platform

    图 14  解码报文内容

    Figure 14.  Decoded message content

    表  2  解调方法对比分析(无频偏,不同窗口长度,本文方法)

    Table  2.   Comparison of different demodulation methods (without frequency offset,different window lengths, the proposed method)

    信噪比/dB 误码率
    窗口长度为2 窗口长度为4 窗口长度为6 窗口长度为8 窗口长度为10 窗口长度为12
    0 7.553×10−2 7.523×10−2 7.522×10−2 7.469×10−2 7.447×10−2 7.347×10−2
    1 5.283×10−2 5.198×10−2 5.139×10−2 5.114×10−2 5.168×10−2 5.126×10−2
    2 3.614×10−2 3.537×10−2 3.578×10−2 3.438×10−2 3.361×10−2 3.267×10−2
    3 2.761×10−2 2.669×10−2 2.534×10−2 2.464×10−2 2.074×10−2 2.026×10−2
    4 1.532×10−2 1.403×10−2 1.400×10−2 1.296×10−2 1.209×10−2 1.190×10−2
    5 5.849×10−3 5.499×10−3 5.445×10−3 5.263×10−3 5.136×10−3 4.715×10−3
    6 2.536×10−3 2.456×10−3 2.486×10−3 2.400×10−3 2.290×10−3 2.071×10−3
    7 7.919×10−4 7.851×10−4 7.818×10−4 7.763×10−4 6.167×10−4 6.258×10−4
    8 2.846×10−4 2.001×10−4 1.984×10−4 1.925×10−4 1.443×10−4 1.467×10−4
    9 4.224×10−5 3.654×10−5 3.090×10−5 3.365×10−5 3.377×10−5 3.051×10−5
    10 4.375×10−6 3.992×10−6 3.897×10−6 3.878×10−6 3.519×10−6 3.433×10−6
    下载: 导出CSV

    表  3  解调方法对比(有频偏,不同解调方法,信噪比为10 dB)

    Table  3.   Comparison of different demodulation methods (with frequency offset, different demodulation methods, SNR=10 dB)

    频偏/% 误码率
    相干解调 过零点检测 差分解调 过零点斜率加窗解调(窗口长度为8)
    2 2.412×10−3 3.858×10−1 1.121×10−3 2.879×10−5
    4 7.486×10−3 3.972×10−1 2.371×10−3 6.565×10−4
    6 9.860×10−2 4.162×10−1 3.108×10−3 9.019×10−4
    8 1.261×10−1 4.341×10−1 3.630×10−3 1.246×10−3
    10 1.987×10−1 4.241×10−1 1.267×10−2 3.882×10−3
    下载: 导出CSV

    表  1  解调方法对比分析(无频偏,不同解调方法)

    Table  1.   Comparison of different demodulation methods(without frequency offset, different demodulation methods)

    信噪比/dB 误码率
    相干解调 过零点检测 差分解调 过零点斜率加窗解调(窗口长度为8)
    0 7.865×10−2 3.909×10−1 2.568×10−1 7.469×10−2
    1 5.628×10−2 3.890×10−1 2.113×10−1 5.114×10−2
    2 3.751×10−2 3.788×10−1 1.682×10−1 3.438×10−2
    3 2.288×10−2 3.738×10−1 1.313×10−1 2.464×10−2
    4 1.250×10−2 3.737×10−1 9.439×10−2 1.296×10−2
    5 5.954×10−3 3.613×10−1 6.321×10−2 5.263×10−3
    6 2.388×10−3 3.522×10−1 3.941×10−2 2.400×10−3
    7 7.727×10−4 3.450×10−1 2.056×10−2 7.763×10−4
    8 1.909×10−4 3.309×10−1 8.881×10−3 1.925×10−4
    9 3.362×10−5 3.177×10−1 2.291×10−3 3.365×10−5
    10 3.875×10−6 2.983×10−1 3.076×10−4 3.878×10−6
    下载: 导出CSV

    表  4  解调方法对比(有频偏,不同窗口长度,信噪比为10 dB,本文方法)

    Table  4.   Comparison of different demodulation methods (with frequency offset, different window lengths, SNR=10 dB, the proposed method)

    频偏/% 误码率
    窗口长度为2 窗口长度为4 窗口长度为6 窗口长度为8 窗口长度为10 窗口长度为12
    2 3.968×10−5 2.987×10−5 2.622×10−5 2.879×10−5 3.514×10−5 6.873×10−5
    4 8.639×10−4 6.577×10−4 6.726×10−4 6.565×10−4 8.126×10−4 2.840×10−3
    6 1.293×10−3 9.524×10−4 9.261×10−4 9.019×10−4 1.812×10−3 3.547×10−3
    8 2.374×10−3 1.846×10−3 1.973×10−3 1.246×10−3 2.565×10−3 6.918×10−3
    10 6.684×10−3 5.556×10−3 6.277×10−3 3.882×10−3 7.091×10−3 2.349×10−2
    下载: 导出CSV

    表  5  USRP数据和仿真数据对比 (仿真数据,信噪比为0)

    Table  5.   Comparison of USRP data and simulation data (simulation data, SNR=0)

    数据 误码率
    相干解调 过零点检测 差分解调 过零点斜率加窗解调
    报文数据1 7.765×10−2 3.910×10−1 2.495×10−1 7.469×10−2
    报文数据2 7.869×10−2 3.309×10−1 2.367×10−1 7.625×10−2
    随机数据1 7.523×10−2 3.482×10−1 2.918×10−1 7.664×10−2
    随机数据2 7.619×10−2 3.774×10−1 2.128×10−1 7.615×10−2
    下载: 导出CSV

    表  6  USRP数据和仿真数据对比 (USRP接收数据,信噪比为0)

    Table  6.   Comparison of USRP data and simulation data (data received by USRP, SNR=0)

    数据 误码率
    相干解调 过零点检测 差分解调 过零点斜率加窗解调
    报文数据1 9.971×10−2 4.371×10−1 3.269×10−1 8.519×10−2
    报文数据2 1.001×10−1 3.917×10−1 2.901×10−1 8.610×10−2
    随机数据1 9.864×10−2 3.934×10−1 3.117×10−1 8.636×10−2
    随机数据2 9.876×10−2 4.143×10−1 2.965×10−1 8.770×10−2
    下载: 导出CSV

    表  7  实测接收报文结果与PlanePlotter软件处理结果对比

    Table  7.   Comparison of measured received message results and PlanPlotter software processing results %

    数据 成功率
    PlanePlotter软件 相干解调 过零点检测 差分解调 过零点斜率加窗解调
    操场数据1 89.655 56.896 56.896 56.896 93.103
    操场数据2 88.524 63.946 63.946 63.946 93.442
    天台数据1 87.097 66.129 66.129 66.129 90.323
    天台数据2 86.667 63.333 63.333 63.333 90.000
    下载: 导出CSV
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出版历程
  • 收稿日期:  2022-04-28
  • 录用日期:  2022-09-23
  • 网络出版日期:  2022-11-01
  • 整期出版日期:  2024-03-27

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