海上角反射体群的RCS快速混合预估算法

在高频、远场条件下,对海上多角反射体构成的无源对抗系统的雷达散射面积(radar cross section,RCS)进行预估。针对传统算法计算量大、复杂度高的问题,提出综合利用改进的几何光学/区域投影法(geometrical optics/area projection,GO/AP)和散射中心合成法,进行海上角反射体群RCS的快速预估。首先,根据角反射体的分布态势,利用改进GO/AP算法实时计算各角反射体的RCS;然后,利用散射中心合成法将各角反射体的RCS贡献量相干叠加,快速预估角反射体群在特定分布态势下的RCS;最后,通过多次计算不同分布态势下的RCS,取平均值表征角反射体群在特定雷达照射方向下的RCS水平。利用FEKO软件对算法进行仿真验证,结果表明:所提算法在保证计算精度的前提下,能够显著提高海上角反射体群RCS的预估效率。

Hybrid RCS evaluation method for maritime multi-corner reflectors

Evaluate the radar cross section (RCS) of the passive countermeasure system composed of maritime multi-corner reflectors in the far field and high frequency environment. Aiming at the problem of high complexity as well as large computation cost, a hybrid rapid method, combining the improved geometrical optics/area projection (GO/AP) with the scattering center composition algorithm, is proposed to estimate the RCS of multi-corner reflectors efficiently. Firstly, each corner reflector’s RCS is obtained by means of the improved GO/AP according to their distribution situation. Secondly, based on the scattering center composition algorithm, take the coherent superposition of each corner reflector’s component as RCS of multi-corner reflectors under the specific distribution situation. Then, the average of different distribution situations is calculated to represent the overall level of RCS under the specific incident direction. Finally, the validity and efficiency of the hybrid method is confirmed by the comparison with FEKO simulation results.