| 游波,蔡志明.典型非高斯分布假设下累积和检测方法性能研究[J].声学技术,2019,38(6):686~690 |
| 典型非高斯分布假设下累积和检测方法性能研究 |
| Research on the performance of page test method under the hypothesis of typical non-Gaussian distribution |
| 投稿时间：2018-10-11 修订日期：2018-12-20 |
| DOI：10.16300/j.cnki.1000-3630.2019.06.015 |
| 中文关键词: 累积和检测 瞬态信号检测 被动声呐检测 非高斯概率分布函数 |
| 英文关键词: page test transient signal detection passive sonar detection non-Gaussian probability distribution function |
| 基金项目:国家自然科学基金资助项目（61401494）；2018年湖北省教育厅科学技术研究计划指导性项目（B2018325）；武昌工学院博士基金项目（2017BSJ01） |
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| 中文摘要: |
| 累积和检测方法是根据声呐目标信号出现与消失时概率密度函数（Probability Distribution Function，PDF）的变化进行有效的瞬态信号检测。以非高斯模型t分布假设替代传统的高斯分布方差变化假设作为描述瞬态信号的PDF形式，推导了累积和检验统计量的表达、更新量PDF求取的数值方法，利用快速傅里叶变换法计算了门限和自由度等检测参数。利用仿真的落水信号、船体加速信号和消声水池实验数据进行检验。结果表明，基于t分布假设的累积和方法对瞬态脉冲信号的检测效果优于常规累积和方法，能更快地响应信号变化，更好地抑制背景干扰。 |
| 英文摘要: |
| The page test is an effective method for transient signal detection according to the change of probability distribution function (PDF) of the detected sequences when the sonar target signal emerges or disappears, and the PDF usually has non-Gaussian characteristics. A typical non-Gaussian PDF model, the t distribution, is taken to replace the traditional Gaussian PDF model in this paper. Under the hypothesis of t distribution, the expression of page test statistic and the numerical calculation method for the updated PDF are derived. The parameters essential for detection including threshold and degree of freedom are calculated by FFT approach. Simulated falling water signal, ship acceleration signal and the signal obtained in the anechoic tank are used to verify the algorithm of page test with t distribution. The results show that compared with the algorithm with traditional Gaussian PDF, the new algorithm proposed in this paper can detect underwater transient signals more effectively, respond to signal change more quickly and can better suppress background interference. |
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