耦合目标近场散射外推技术研究

发布时间：2018-11-17 14:22

【摘要】：针对具有多次散射的耦合目标在不满足远场条件下测量的散射方向图发生畸变的问题,通过分析耦合目标的近场-远场转换关系,提出一种"多发多收"模式的近场散射外推方法.在获得全角域的近场双站信息后,对各角度近场接收的散射数据进行外推处理,然后根据互易定理,将外推后的数据等效为"远场发射、近场接收"数据.接下来对该数据再进行一次外推,满足"远场发射、远场接收"的条件,最后取出对角线上的元素获得各角度的远场RCS(Radar Cross Section,RCS).通过建立存在强耦合机制的二面角和腔体结构模型,利用FEKO和MATLAB软件对方法进行仿真,将"多发多收"外推的结果与远场RCS进行比对.结果表明:该方法得到的结果与远场RCS方向图吻合良好,全角域均值误差小于1dB,验证了方法的有效性.
[Abstract]:In order to solve the problem that the scattering pattern of coupled target with multiple scattering does not satisfy the condition of far field, the near-field and far-field transformation relationship of coupled target is analyzed. This paper presents a near field scattering extrapolation method for multi-receiving mode. After obtaining the near-field bistatic information in the whole angle domain, the scattering data received from each angle near field are extrapolated and processed, and the extrapolated data is equivalent to "far-field emission, near-field receiving" data according to the reciprocity theorem. Then the data is extrapolated again to satisfy the condition of "far-field emission, far-field receiving". Finally, the elements on the diagonal line are taken out to obtain the far-field RCS (Radar Cross Section,RCS of each angle. By establishing the dihedral angle and cavity structure model with strong coupling mechanism, the method is simulated by using FEKO and MATLAB software, and the extrapolation results of "multiple receiving" are compared with the far field RCS. The results show that the results obtained by this method are in good agreement with the far field RCS pattern, and the mean error in the whole angle domain is less than 1 dB, which verifies the effectiveness of the method.
【作者单位】：西北工业大学电子信息学院;西北工业大学无人机特种技术重点实验室;
【基金】：国家自然科学基金(No.61371023,No.61201320,No.61571368)
【分类号】：TN95

【相似文献】