| 基于分数低阶统计量的水下目标定向新方法 |
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| 引用本文： | 邱天爽,查代奉. 基于分数低阶统计量的水下目标定向新方法[J]. 系统工程与电子技术, 2006, 28(7): 941-945 |
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| 作者姓名： | 邱天爽 查代奉 |
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| 作者单位： | 1. 大连理工大学电子与信息工程学院,辽宁,大连,116024
2. 九江大学电子工程学院,江西,九江,332005 |
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| 基金项目： | 国家自然科学基金(60372081,30574075,30170259)，辽宁省科学技术基金(2001101057)，教育部博士点基金(20050141025)资助课题 |
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| 摘 要： | 针对传统方法对阵列信号处理所研究的噪声采用高斯分布的模型来进行描述,当噪声存在显著的尖峰时,不能得到满意结果的问题。利用稳定分布对实际中所遇到的具有较大脉冲特性的随机噪声进行建模,分析了共变在阵列信号处理中的不足,利用已有的矢量水听器模型建立一种水下目标定向系统,提出了一种基于分数阶相关的水下目标定向算法。仿真表明这种算法是一种在高斯和分数低阶α-稳定分布噪声条件下具有良好韧性的水下目标定向算法,相对共变而言,分数阶相关具有更宽的噪声特征指数范围,更适用于实际应用。
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| 关 键 词： | 阵列信号处理 α-稳定分布 矢量水听器 共变 分数阶相关 |
| 文章编号： | 1001-506X(2006)07-0941-05 |
| 修稿时间： | 2005-07-20 |
New algorithm for underwater target localization based on fractional lower order statistics |
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| QIU Tian-shuang,ZHA Dai-feng. New algorithm for underwater target localization based on fractional lower order statistics[J]. System Engineering and Electronics, 2006, 28(7): 941-945 |
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| Authors: | QIU Tian-shuang ZHA Dai-feng |
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| Abstract: | Conventional methods of array signal processing are based on Gaussian assumption,which can not lead to good performance.Alpha stable distribution can be the better model of the impulsive random processes in physical application.After introducing the fractional lower order statistics,including the covariation and the fractional order correlation(FOC),a new method of 2-D direction finding based on the fractional order correlation for underwater 2-D source localization using a vector hydrophones array under alpha-stable noise conditions is presented.Simulation experiments and analysis show that the proposed method is robust in a wide range of characteristic exponent values of stable distribution. |
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| Keywords: | array signal processing alpha stable distribution vector hydrophone covariation fractional order correlation |
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