| 摘要: |
| 本文通过对大量实测数据的处理与定量分析，证明Gamma分布可用于X波段雷达海杂波幅度分布的建模，并介绍了两种适用于Gamma分布杂波背景的恒虚警（CFAR）检测器：基于最大似然估计的MLG-CFAR和基于加权幅度循环迭代的WAI-CFAR。理论分析证明，MLG-CFAR检测器对Gamma分布的杂波平均功率估计值是渐进有效的，且在形状参数已知的前提下，该检测器对尺度参数具有恒虚警特性，在均匀、非均匀杂波背景中的检测性能仿真结果验证了该检测器在Gamma杂波中的最优性；WAI-CFAR检测器综合了均值类和有序统计量类CFAR算法的优点，在均匀杂波背景中具有较好的性能，在非均匀杂波背景中可通过灵活设定加权系数，获得较强的目标检测能力和鲁棒的虚警控制能力。 |
| 关键词: 恒虚警 目标检测 海杂波 Gamma分布 |
| DOI：DOI:10.3969/j.issn.1672-2337.2021.03.012 |
| 分类号:TN959 |
| 基金项目: |
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| Applications of Gamma Distribution in Sea Clutter Modelling and Maritime Target Detection |
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ZHOU Wei，ZHU Yong，DU Yuhan，XIE Junhao
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1. The 38th Research Institute of China Electronics Technology Group Corporation, Hefei 230088, China;2. School of Electronics and Information Engineering, Harbin Institute of Technology, Harbin 150001, China
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| Abstract: |
| The Gamma distribution is demonstrated to be promising to model the amplitude distribution of sea clutter based on experimental results. Furthermore, two CFAR detectors, namely the MLG-CFAR based on maximum likelihood estimation and the WAI-CFAR based on weighted amplitude iteration, are provided for Gamma-distributed background. Theoretical analysis shows that the derived estimator of the MLG-CFAR is an asymptotically efficient estimator of the mean power of the Gamma clutter. With a known shape parameter, the MLG-CFAR is demonstrated to maintain CFAR property with respect to the scale parameter of the Gamma distribution. Simulation results validate the superiority and generality of the MLG-CFAR in homogenous Gamma-distributed background. The WAI-CFAR is proposed by combining the advantages of cell averaging class CFAR detectors and ordered statistic class CFAR detectors. The superiority of the WAI-CFAR, which is applicable to different clutter scenarios with corresponding weighting factors, is investigated and verified by simulations. |
| Key words: constant false alarm rate target detection sea clutter Gamma distribution |
