利用三阶混沌系统构造了一种新的微弱信号检测系统——类Liu系统,对类Liu系统进行了深度的理论分析.类Liu系统中,当输入待测信号幅值大于某临界值时,系统可达到平衡点S0,S0中系统变量x平衡于摄动力信号,系统变量y,z收敛于零态,且S0对应...利用三阶混沌系统构造了一种新的微弱信号检测系统——类Liu系统,对类Liu系统进行了深度的理论分析.类Liu系统中,当输入待测信号幅值大于某临界值时,系统可达到平衡点S0,S0中系统变量x平衡于摄动力信号,系统变量y,z收敛于零态,且S0对应的Lyapunov指数小于零.通过Matlab仿真、Multisim电路仿真以及实际电路证明了类Liu系统的周期态收敛性及广域检测性,解决了传统Duffing系统进行微弱信号检测时周期态不收敛、只能进行窄域检测等问题,同时谱级信噪比范围仍可达-46.57 d B.类Liu系统采用了全新的设计理念,具有较高的实用价值,对未来海洋物联网中的水声通信有一定参考价值.展开更多
An adaptive algorithm for extracting weak signal based on the theory of stochastic resonance(SR) was proposed. It was implemented by investigating the self correlation of the outputs of the bistable system(with differ...An adaptive algorithm for extracting weak signal based on the theory of stochastic resonance(SR) was proposed. It was implemented by investigating the self correlation of the outputs of the bistable system(with different μ ). The results show that the self correlation will reach maximum when a sudden change of output occurs, and hence prove that SR is sensitive sharply to the change of the parameters μ , and also provide one novel method to express the outputs which hasnt been solved till now. The adaptive algorithm was also applied to analyze the weak Laser Raman spectrum of a CCl 4 sample(liquid in capillary) which was measured with SPEX 1403 Laser Raman spectrometer from 250 cm -1 to 418 cm -1 on 5 mW(output power of laser) . The spectrum was analyzed with the adaptive algorithm by varying the data to (-4 13, 3 50) and declining μ from 2 0 with step 0 01. The results obtained show that the adaptive algorithm was able to detect the weak signal automatically and correctly.展开更多
文摘利用三阶混沌系统构造了一种新的微弱信号检测系统——类Liu系统,对类Liu系统进行了深度的理论分析.类Liu系统中,当输入待测信号幅值大于某临界值时,系统可达到平衡点S0,S0中系统变量x平衡于摄动力信号,系统变量y,z收敛于零态,且S0对应的Lyapunov指数小于零.通过Matlab仿真、Multisim电路仿真以及实际电路证明了类Liu系统的周期态收敛性及广域检测性,解决了传统Duffing系统进行微弱信号检测时周期态不收敛、只能进行窄域检测等问题,同时谱级信噪比范围仍可达-46.57 d B.类Liu系统采用了全新的设计理念,具有较高的实用价值,对未来海洋物联网中的水声通信有一定参考价值.
文摘An adaptive algorithm for extracting weak signal based on the theory of stochastic resonance(SR) was proposed. It was implemented by investigating the self correlation of the outputs of the bistable system(with different μ ). The results show that the self correlation will reach maximum when a sudden change of output occurs, and hence prove that SR is sensitive sharply to the change of the parameters μ , and also provide one novel method to express the outputs which hasnt been solved till now. The adaptive algorithm was also applied to analyze the weak Laser Raman spectrum of a CCl 4 sample(liquid in capillary) which was measured with SPEX 1403 Laser Raman spectrometer from 250 cm -1 to 418 cm -1 on 5 mW(output power of laser) . The spectrum was analyzed with the adaptive algorithm by varying the data to (-4 13, 3 50) and declining μ from 2 0 with step 0 01. The results obtained show that the adaptive algorithm was able to detect the weak signal automatically and correctly.
