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为了研究等离子体对超高速模型雷达散射截面的影响,利用气动物理靶测量超高速模型及其绕流的雷达散射截面(RCS),给出了雷达接收信号、信号频谱和模型雷达散射截面的一维距离像。利用时域有限差分方法(FDTD)分析了等离子体鞘套对模型电磁散射特性的影响。将数值模拟结果和试验结果进行了对比,对比结果显示二者符合得很好。数值模拟结果还表明雷达入射角小角度偏移对测量结果有较大影响。
In order to study the effect of plasma on the radar cross section of the superhigh speed model, a new model of the superhigh speed aerodynamic target measurement and its cross-flow RCS (Radar Cross Section) Dimension distance image. The influence of plasma sheath on the electromagnetic scattering characteristics of the model was analyzed by FDTD method. The numerical simulation results and the experimental results were compared, the results show that the two are in good agreement. The numerical simulation results also show that the small angle deviation of radar incident angle has a great influence on the measurement results.