| GRECO中棱边绕射场计算的改进 |
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| 引用本文： | 秦德华,王宝发,刘铁军.GRECO中棱边绕射场计算的改进[J].中国航空学报,2004,17(2). |
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| 作者姓名： | 秦德华 王宝发 刘铁军 |
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| 作者单位： | Department of Electronic Engineering，Beijing University of Aeronautics and Astronautics，Beijing 100083，China，Department of Electronic Engineering，Beijing University of Aeronautics and Astronautics，Beijing 100083，China，Department of Electronic Engineering，Beijing University of Aeronautics and Astronautics，Beijing 100083，China |
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| 基金项目： | FoundationofNationalKeyLaboratoryofElectromagneticEnvironmentalResearch ( 0 0 js67.1.1.hk0 10 1) |
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| 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。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 ,指出了相关文献中存在的错误 ,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
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| 关 键 词： | 电磁波散射 图形电磁计算 雷达散射截面 边缘绕射 |
Improvements of Edges Diffraction Computing in GRECO |
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| QIN De-hua,WANG Bao-fa,LIU Tie-jun.Improvements of Edges Diffraction Computing in GRECO[J].Chinese Journal of Aeronautics,2004,17(2). |
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| Authors: | QIN De-hua WANG Bao-fa LIU Tie-jun |
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| Abstract: | Graphical Electromagnetic Computing (GRECO) is one of the valuable methods for computing the radar cross section (RCS) of complex radar target in high frequency region. But there are some shortages of wedge detecting method in the original GRECO literature. A new method for collecting the edge pixels and wedge parameters is presented in this paper. An expression of edge diffraction field in the original GRECO literature is in error, the error-corrected formulas are derived by using method of equivalent edge currents (MEC) and physical theory of diffraction (PTD). Finally, the total RCS expression is given by physical optics (PO) and PTD method. The computing results are in close agreement with the measured data. |
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| Keywords: | electromagnetic wave scattering GRECO radar cross section edge diffraction |
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