【摘要】 常规雷达飞机目标回波的多重分形特性提供了对产生目标回波结构动力学特征的精细描述,为常规雷达飞机目标的分类和识别提供了新的途径.在介绍多重分形的研究方法以及常规雷达飞机目标回波数学模型的基础上,利用多重分形测度分析手段,详细分析常规雷达飞机目标回波的质量指数和多重分形奇异谱等多重分形特性曲线,并定义质量指数对称度Rτ、多重分形谱宽度Δσ和非对称指数Rσ等多重分形特征参数.实验结果表明:喷气式飞机、螺旋桨飞机和直升机这3类飞机目标的常规雷达回波数据具有显著不同的多重分形特征,所定义的3种多重分形特征参数可以作为常规雷达飞机目标分类和识别的有效特征.更多还原

【Abstract】 The multifractal feature of the conventional radar return signal from aircraft targets offers the fine description of the dynamic characteristics which induce the target’s echo structure,therefore it can provide a new way to the aircraft target classification and its recognition in the conventional radar.On the basis of introducing the research methods for the multifractal as well as the mathematical model of aircraft returns in the conventional radar,by means of the multifractal measure analysis,the multifractal characteristic curves of the aircraft returns such as the mass index and the multifractal singularity spectrum were analyzed in detail,and several multifractal characteristic parameters such as the symmetry degree Rτ of the mass index,the multifractal singularity spectrum width Δσ,the multifractal singularity spectrum asymmetric index Rσ and etc.,were defined.The experimental analysis showed that the conventional radar returns from three types of aircraft targets containing jets,propeller aircrafts and helicopters,had significantly different multifractal characteristic curves,and the three multifractal characteristic parameters could be used as effective features for aircraft target classification and recognition in the conventional radar.更多还原