图形电磁计算法在双站散射计算中的工程扩展

Application of the GRECO method to bistatic scattering simulation

鉴于GRECO法在电磁散射计算中具有快速、准确和可视化等特点 ,其在雷达目标单站RCS预估中有着广泛应用。对足够光滑的目标 ,当双站角较小时 ,可以单—双站等效原理分析其双站散射特性 ,但对于大双站角和复杂目标双站情况 ,GRECO法已不适用 ,而目前分析复杂目标双站RCS的CMT法和PEM法由于计算时间过长 ,很难满足工程设计的需要 ;本文给出一种新的GRECO扩展法以适应实时双站散射场分析的需求 ,应用GRECO、单—双站等效原理和Leonov公式 ,给出了适合复杂目标双站RCS计算的方法———GRECO扩展 ,仿真结果证明了此方法的正确性和实用性。

Graphical Electromagnetic Computing (GRECO) is widely used in monostatic Radar Cross Section (RCS) analysis in view of the visibility, accuracy and quickness of the method. The bistatic RCS prediction can be obtained by using the bistatic equivalence theorem for some sufficiently smooth targets. But the equivalence theorem failed for large bistatic angle and non-smooth targets. Some methods, such as Current Marching Method (CMT) and Parabolic Equation Method (PEM), will take a long time in bistatic RCS calculation and can be hardly suitable in engineering design. This paper presented a new approach: GRECO expanding method to suit the demand of bistatic scattering prediction in real time. The GRECO expanding method was given by using the hybrid of GRECO, mono-bistatic equivalence theory and Leonov formula. The simulation results show that the method above is effective and utility.