一种基于新型间歇混沌振子的舰船线谱检测方法

发布时间：2018-03-22 12:32

本文选题：微弱线谱检测　切入点：未知频率检测　出处：《物理学报》2014年06期 　论文类型：期刊论文

【摘要】：为了实现低信噪比下未知频率的舰船辐射线谱的检测,对常规型间歇混沌振子列检测方法进行了改进,提出了一种基于适应步长型间歇混沌振子的信号检测方法.该方法可以只用一个Duffing振子,通过设定一组能够覆盖待测信号所在频段的求解步长序列,实现对未知频率、具有任意初相位的微弱周期信号的搜索检测.为进一步提高系统的弱信号检测性能,分析了Holmes型Duffing方程在不同频率内置策动力下对弱信号灵敏度的差异.综合理论分析和仿真研究结果给出了Duffing振子在内置策动力角频率为0.4 rad/s时对弱信号检测性能最佳,并据此对所采用的Duffing振子进行了优化;仿真结果表明,改进后的Duffing振子的弱信号检测性能提高了12 dB.最后将此方法应用于一组含有舰船辐射线谱的实船数据,结果表明此方法可以实现低信噪比下的未知频率微弱线谱检测.
[Abstract]:In order to detect the linear spectrum of ship radiation with unknown frequency at low SNR, the conventional detection method of intermittent chaotic oscillator sequence is improved. In this paper, a signal detection method based on adaptive step size intermittent chaotic oscillator is proposed. The method can use only one Duffing oscillator and realize unknown frequency by setting a set of solving step size sequences which can cover the frequency band of the signal to be measured. Search and detection of weak periodic signal with arbitrary initial phase. The difference of the sensitivity of Holmes type Duffing equation to weak signal under different internal driving force is analyzed. The results of theoretical analysis and simulation study show that the Duffing oscillator has the best detection performance for weak signal when the angular frequency of internal force is 0.4 rad/s. The simulation results show that the weak signal detection performance of the improved Duffing oscillator is improved by 12 dB. Finally, the proposed method is applied to a set of real ship data containing ship radiation line spectrum. The results show that this method can be used to detect the weak linear spectrum of unknown frequency at low signal-to-noise ratio (SNR).
【作者单位】：哈尔滨工程大学水声技术重点实验室;哈尔滨工程大学水声工程学院;
【基金】：国家自然科学基金(批准号:51279033)和国家自然科学基金重点项目(批准号:11234002)资助的课题~~
【分类号】：TN911.7;O415.5

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