海上角反射体群的 RCS 快速混合预估算法

摘要

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（geomet-rical 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。%Evaluate the radar cross section (RCS)of the passive countermeasure system composed of mari-time multi-corner reflectors in the far field and high frequency environment.Aiming at the problem of high com-plexity as well as large computation cost,a hybrid rapid method,combining the improved geometrical optics/ar-ea 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 algo-rithm,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 re-present 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.