摘要
本文引入时变分形曲面描述天然粗糙面的局部动态特征 ,给出三个合理电磁散射假设 ,采用基尔霍夫解定性分析散射的时域分形特性 ,导出天然粗糙面杂波的分形模型 .根据随机分形信号小波系数近似不相关的特性 ,提出小波白化滤波—相关检测法 ,并详细论述了该方法的相关理论 .理论分析和实验表明 ,天然粗糙面杂波符合分形模型 。
The time-variant fractal surface is adopted to describe regional dynamical feat ure of natural rough surface.Under three rational assumptions on electromagnetic scattering,the time-domain property of scattering field is analyzed qualitativ ely by applying Kirchhoff solution,and the fractal model of clutter from natural rough surface is deduced.According to the fact that wavelet detail coefficients of random fractal signal are approximately uncorrelated,the method based on wav elet-based whitening filter and correlation detection is proposed with detailed theory.Theoretical analysis and experimental results prove that the clutter mat ches the fractal model and the proposed method is effective on detecting target.
出处
《电子学报》
EI
CAS
CSCD
北大核心
2000年第7期138-141,共4页
Acta Electronica Sinica
关键词
天然粗糙面
杂波
相关检测
雷达
目标检测
natural rough surface
clutter
fractal model
whitening filter,correlation detecti on
