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机载超短波电台邻道干扰减敏特性建模与评估

武南开 苏东林 何洪涛 刘焱

武南开, 苏东林, 何洪涛, 等 . 机载超短波电台邻道干扰减敏特性建模与评估[J]. 北京航空航天大学学报, 2017, 43(3): 481-487. doi: 10.13700/j.bh.1001-5965.2016.0230
引用本文: 武南开, 苏东林, 何洪涛, 等 . 机载超短波电台邻道干扰减敏特性建模与评估[J]. 北京航空航天大学学报, 2017, 43(3): 481-487. doi: 10.13700/j.bh.1001-5965.2016.0230
WU Nankai, SU Donglin, HE Hongtao, et al. Adjacent channel interference modeling and assessment on reduction of airborne VHF radio sensitivity[J]. Journal of Beijing University of Aeronautics and Astronautics, 2017, 43(3): 481-487. doi: 10.13700/j.bh.1001-5965.2016.0230(in Chinese)
Citation: WU Nankai, SU Donglin, HE Hongtao, et al. Adjacent channel interference modeling and assessment on reduction of airborne VHF radio sensitivity[J]. Journal of Beijing University of Aeronautics and Astronautics, 2017, 43(3): 481-487. doi: 10.13700/j.bh.1001-5965.2016.0230(in Chinese)

机载超短波电台邻道干扰减敏特性建模与评估

doi: 10.13700/j.bh.1001-5965.2016.0230
基金项目: 

国家自然科学基金 61521091

国家自然科学基金 61427803

详细信息
    作者简介:

    武南开, 男, 博士研究生。主要研究方向:机载设备电磁干扰预测与评估、电台接收机非线性建模等

    苏东林, 女, 博士, 教授, 博士生导师。主要研究方向:电磁兼容、电磁环境效应、计算电磁学、射频微波电路与系统、新型飞行器机载共形/共用/小型化天线等

    何洪涛, 男, 博士, 高级工程师。主要研究方向:电磁兼容试验技术、复杂电磁环境效应评估等

    通讯作者:

    苏东林, E-mail:sdl@buaa.edu.cn

  • 中图分类号: TN911.4

Adjacent channel interference modeling and assessment on reduction of airborne VHF radio sensitivity

Funds: 

National Natural Science Foundation of China 61521091

National Natural Science Foundation of China 61427803

More Information
  • 摘要:

    为了解决传统邻道干扰模型与测试数据对比误差较大的难题,将接收机射频前端的非线性响应模型和信噪比模型相融合,考虑到邻道干扰信号与本振相位噪声混频而产生的噪声,提出了噪声修正因子,进一步建立了超短波(VHF)电台接收机邻道干扰减敏模型,与典型实装测试数据相对比误差约为3dB,表明本文方法能够很好地描述邻道干扰的减敏特性。利用本文模型给出了机载超短波电台邻道干扰评估方法,结合直升机编队飞行时电台邻道干扰评估案例,验证了本文方法的适用性和有效性,具有一定的工程应用价值。

     

  • 图 1  超短波电台接收机前端邻道干扰示意图

    Figure 1.  Schematic diagram of adjacent channel interference at front end of VHF radio receiver

    图 2  非线性输出项幅度和频率筛选

    Figure 2.  Output of nonlinear response screening by amplitude and frequency

    图 3  邻道干扰试验配置

    Figure 3.  Test configuration of adjacent channel interference

    图 4  信噪比下降3 dB和6 dB时干扰信号功率与频率偏差关系

    Figure 4.  Relation between interference signal power and frequency deviation when SNR decreases by 3 dB and 6 dB

    图 5  3种频率偏差下干扰信号功率与信噪比下降幅度关系

    Figure 5.  Relation between interference signal power and reduction of SNR under three kinds of frequency deviation

    图 6  3种频率偏差下计算与实测的信噪比下降误差对比

    Figure 6.  Error comparison between calculated and measured reduction of SNR under three kinds of frequency deviation

    图 7  机载超短波电台邻道干扰评估流程

    Figure 7.  Assessment procedure of adjacent channel interference of airborne VHF radio

    图 8  直升机编队飞行邻道干扰场景

    Figure 8.  Scene of helicopter formation flight interfered by adjacent channel

    图 9  干扰信号功率计算示意图

    Figure 9.  Schematic diagram of interference signal power calculation

    图 10  已知工作频率偏差的邻道干扰评估

    Figure 10.  Adjacent channel interference assessment of known operating frequency deviation

    图 11  不产生邻道干扰时的频率偏差评估

    Figure 11.  Assessment of frequency deviation without adjacent channel interference

    表  1  双信号输入下的前3阶非线性响应

    Table  1.   First three order nonlinear response of dual-channel input signal

    编号 响应幅度 响应频率 响应类型
    1 a1vI ωI 1阶线性
    2 a1vS ωS 1阶线性
    3 0.5a2vI2 2ωI 2阶谐波
    4 0.5a2vS2 2ωS 2阶谐波
    5 a2vIvS ωI±ωS 2阶交调
    6 0.25a3vI3 3ωI 3阶谐波
    7 0.25a3vS3 3ωS 3阶谐波
    8 0.75a3vI2vS 2ωI±ωS 3阶交调
    9 0.75a3vS2vI 2ωS±ωI 3阶交调
    10 0.75a3vI3 2ωI-ωI 3阶压缩
    11 0.75a3vS3 2ωS-ωS 3阶压缩
    12 1.5a3vIvS2 ωI+ωS-ωS 3阶交调
    13 1.5a3vSvI2 ωS+ωI-ωI 3阶交调
    下载: 导出CSV
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出版历程
  • 收稿日期:  2016-03-24
  • 录用日期:  2016-04-01
  • 刊出日期:  2017-03-20

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