| 复杂海况下舰船微弱信号的时频辨识研究 |
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| 引用本文： | 张宁,林春生,庞学亮,于李洋.复杂海况下舰船微弱信号的时频辨识研究[J].兵工学报,2009,30(6):834-838. |
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| 作者姓名： | 张宁 林春生 庞学亮 于李洋 |
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| 作者单位： | 海军工程大学,兵器工程系,湖北,武汉,430033;海军驻大连426厂军事代表室,辽宁,大连,116005 |
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| 摘 要： | 将时频分析技术应用于复杂海况背景下舰船物理场场微弱信号的辨识研究。分析了Wigner-Ville分布(WVD)检测微弱信号时的交叉项干扰问题，采用高阶Butterworth滤波器进行预滤波，并通过Blackman窗数字平滑滤波(SPWD)，抑制WVD交叉项干扰，提高WVD时频分辨率。基于舰船水压场海上测量，对算法进行对比验证，表明该算法显著提高对复杂海况下舰船微弱信号的辨识能力。
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| 关 键 词： | 信息处理技术 微弱信号辨识 Wigner-Ville时频分布 Butterworth预滤波 SPWD |
Time-frequency Identification of Weak Warship Signals in Complex Sea State Background |
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| ZHANG Ning,LIN Chun-sheng,PANG Xue-liang,YU Li-yang.Time-frequency Identification of Weak Warship Signals in Complex Sea State Background[J].Acta Armamentarii,2009,30(6):834-838. |
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| Authors: | ZHANG Ning LIN Chun-sheng PANG Xue-liang YU Li-yang |
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| Affiliation: | 1. Department of Weaponry Engineering, Naval Engineering University，Wuhan 430033, Hubei, China;
2.Naval Military Commissary in NO. 426 Dalian, Dalian 116005, Liaoning, China |
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| Abstract: | The signal time-frequency analysis was applied to identifying the weak physical field signals of warship in complex sea state background. The cross-interference problem of Wigner-Ville distribu?tion in weak signal identification was analyzed. To restrain the cross interference and improve time-fre?quency resolution, a high-order Butterworth pre-filter was introduced into a hydraulic pressure field collecting system and an algorithm of smooth pseudo Wigner-Ville distribution (SPWD) with Black?man window was brought forward. Based on a sea experiment of warship hydraulic pressure measure, the algorithm was validated and contrasted. The results show that the algorithm can improve ability of identiiying the weak warsmp signals obviously in complex sea state. |
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| Keywords: | SPWD |
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