基于Duffing振子的微弱极低频信号检测研究

Research of Weak VLF Signal Detection Based on Duffing Oscillators

未来各国的对潜通信技术越来越趋于极低频通信,为了能够解决如何在强噪声下检测微弱极低频信号,做了一些尝试性的理论研究。在分析了利用Duffing振子检测微弱信号原理的基础上,利用Simulink仿真软件建立系统仿真模型,分析总结极低频频段在此系统中的特点,提出了一种利用Duffing振子检测单一频率或者某一频段的微弱极低频信号的新方法。通过大量的仿真实验,证明利用这种方法可以达到了预期的设想,检测信噪比达到-42.5dB,证实了这一方法的理论可行性。

In the near future, there is a worldwide trend towards VLF in the field of the communication technologies with submarines, In order to slove how to detect the weak VLF signal from strong noise background,make some tries on theory research in this paper. After analysing the principle of detecting weak signal, designs simulation model using Simulink, summarizes the characteristic of the VLF in the system, using Duffing Oscillators, the paper gaves a new method which is to importing Dulling Oscillators to detect the single frequency or weak VLF signal in a frequency width. By many simulations and experimentations, proves the method can attain the prospective assumer of the paper, it gets an conelution that SNR of Detection gets to -42.5dB and the new method is possible.