GRECO中棱边检测方法及其绕射场计算的改进  

Improvements of Edges Detecting and Diffraction Field Computing in GRECO

作　　者：秦德华[1] 王宝发[1] 刘铁军[1] 

机构地区：[1]北京航空航天大学电子工程系,北京100083

出　　处：《电子学报》2003年第8期1160-1163,共4页Acta Electronica Sinica

基　　金：国家电磁环境研究重点实验室基金 (No .0 0js67.1 .1 .hk0 1 0 1 )

摘　　要：图形电磁计算 (GRECO)方法是计算复杂目标高频区雷达散射截面 (RCS)的有效方法之一 .本文分析了原始GRECO方法在判定目标图象棱边象素的不足之处 ,给出了相应的改进措施 .改进后的软件能够更准确、充分地判定目标的棱边象素及获得棱边参数 .在边缘绕射场的计算方面 ,本文指出了相关文献中存在的错误[1] ,给出了基于等效电磁流法 (MEC)和物理绕射理论 (PTD)的边缘绕射场计算式 ,及与物理光学 (PO)场叠加求取RCS的完整表达式 .计算实例表明 ,新的方法具有更高的准确度 ,与实验测量值吻合 .Graphical Electromagnetic Computing (GRECO) is one of the valuable method for computing the radar cross section (RCS) of complex radar target in high frequency region. But there are some shortages of edges detecting method in original GRECO literature, a new method of collecting the edge pixels and wedge parameters is presented in this paper. Since an expression of edge diffraction field in the literature is in error, the error-correcting formulas are derived by using method of equivalent edge currents (MEG) and physical theory of diffraction (PTD). Finally, the total RCS expression is given by using physical optics (PO) and FID method. The computing results are in close agreement with the measured data.

关 键 词：电磁波散射 图形电磁计算 雷达散射截面 边缘绕射 

分 类 号：TN011.4[电子电信—物理电子学]