A new method for detecting line spectrum of ship-radiated noise using Duffing oscillator
A new method for detecting line spectrum of ship-radiated noise using Duffing oscillator作者机构：Department of Communication Engineering Engineering College of the Chinese People's Armed Police Force Xi'an 710086 China Department of Basic Science Engineering College of the Chinese People's Armed Police Force Xi'an 710086 China College of Marine Engineering Northwestern Polytechnic University Xi'an 710072 China
出 版 物：《Chinese Science Bulletin》 (中国科学通报)
年 卷 期：2007年第52卷第14期
页 面：1906-1912页
核心收录：
学科分类：070207[理学-光学] 07[理学] 08[工学] 0803[工学-光学工程] 0702[理学-物理学]
基 金：National Natural Science Foundation of China (Grant No. 10474079) a major project of National Defense Science and Technology (Grant No. 41303080301)
摘 要：A detection scheme for line spectrum of ship-radiated noise is proposed using Duffing oscillator. The chaotic trajectory of Duffing oscillator is analyzed and the state equation of the system is improved to detect weak periodic signals in different frequencies. According to the simulation results, the phase transforms of Duffing oscillator are sensitive to periodic signals and immune to the random noise and the periodic interference signals which have larger angular frequency difference from the referential signal. By employing Lyapunov exponents in the field of detection as the criteria for chaos, the phase transforms of dynamic behaviors in quantity are successfully determined. Meanwhile, the threshold value in critical state has been evaluated more accurately. Based on the phase transforms of Duffing oscillator, a new method for detecting line spectrum of ship-radiated noise is given. Three types of ship-radiated noise signals are analyzed and the values of line spectrum are acquired successfully by this method. The experimental results show that this method has high sensitivity and high resolution.
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