| 引用本文: | 吴彦华,马庆力.内置频率对Duffing振子微弱二进制相移键控信号盲检测影响.[J].国防科技大学学报,2019,41(1):80-88.[点击复制] |
| WU Yanhua,MA Qingli.Forcing frequency′s influence on blind detection of weak binary phase shift keying signal by using Duffing oscillators[J].Journal of National University of Defense Technology,2019,41(1):80-88[点击复制] |
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| 内置频率对Duffing振子微弱二进制相移键控信号盲检测影响 |
| 吴彦华, 马庆力 |
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(国防科技大学 电子对抗学院， 安徽 合肥 230037)
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| 摘要: |
| 采用Duffing振子实现对微弱二进制相移键控（Binary Phase Shift Keying, BPSK）信号的盲检测时，Duffing系统输出的周期态和混沌态转换之间存在过渡带。针对这一问题，推导出过渡带时长和Duffing系统内置频率之间的关系表达式；指出内置频率越高，过渡带时间越短；仿真实验给出时间频率响应曲线。内置频率的提高，会降低系统检测微弱信号的灵敏度。针对这一问题，推导出周期态下Duffing系统输出幅度作为因变量、内置频率作为自变量的表达式；仿真实验给出幅频响应曲线。针对微弱BPSK信号盲检测，建立变尺度方法和检测阵列相结合的基于S变换提取Duffing系统输出幅度包络的微弱BPSK信号盲检测模型，仿真实验验证了模型方法的有效性。 |
| 关键词: Duffing振子 内置频率 过渡带时长 检测灵敏度 S变换 |
| DOI：10.11887/j.cn.201901012 |
| 投稿日期：2017-12-06 |
| 基金项目:安徽省自然科学基金资助项目（1608085MF138） |
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| Forcing frequency′s influence on blind detection of weak binary phase shift keying signal by using Duffing oscillators |
| WU Yanhua, MA Qingli |
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(College of Electronic Engineering, National University of Defense Technology, Hefei 230037, China)
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| Abstract: |
| There are transition zones in the transitions between the chaotic and periodic states while blindly detecting weak BPSK (binary phase shift keying) signal by using Dufffing oscillator. The relationship expression between transition zone time length and forcing frequency of Duffing system was deduced, and the conclusion that higher forcing frequency leads to shorter transition zone time length was drawn. The simulation experiment gave the time-frequency response curve. The detection sensitivity of Duffing system will lower with the increasing of forcing frequency. The equations of output amplitude as dependent variable and the internal frequency as argument were deduced while Duffing system was in periodic state. The simulation experiment gave the amplitude-frequency response curve. Finally, by using S transform to extract the envelope of Duffing system output, the blind detection model of weak BPSK signal with the scale transformation method combined and the detection array was built. The simulation experiment results show the efficiency of the blind detection model. |
| Keywords: Duffing oscillator forcing frequency transition zone time length detection sensitivity S transform |
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