基于远场的薄壳式天线罩壁厚修磨量反求方法  

Inverse method for determining material removal amount in grinding monolithic radome based on far field

作　　者：许万业[1] 李鹏[1] 连培园 仇原鹰[1] 张树新[1] 

机构地区：[1]西安电子科技大学电子装备结构设计教育部重点实验室,陕西西安710071

出　　处：《系统工程与电子技术》2013年第12期2471-2476,共6页Systems Engineering and Electronics

基　　金：国家自然科学基金重点项目(51035006);国家自然科学基金(51205301);中央高校基本科研业务费(JY10000904019)资助课题

摘　　要：复杂的成型工艺使得机载弹载天线罩罩体各处的材料介电常数往往不一致,这将影响带罩天线系统的电性能,需要通过修磨罩壁几何厚度来补偿材料介电常数偏差的影响。提出了一种基于远场的天线罩壁厚修磨量的反求方法,根据带罩天线的远场计算公式,建立了求解罩体各处透射系数的反演模型,然后根据透射系数以及天线罩的外形、厚度等已知信息反求出各处的介电常数值,再按照电厚度一致的原则确定出壁厚修磨量。此外又提出了一种不增加天线罩网格数的近场积分网格细化方法,提高了反演模型的精度。最后对某1.2m口径正切卵形天线罩进行了数值仿真,结果验证了所提方法的正确性和有效性。The distribution of permittivity of the airborne radome material is usually not uniform because of the sophisticated manufacturing process, which leads to degradation of the electrical performance of antenna-ra- dome systems. Such degradation could be ameliorated by modifying the geometric thickness of the radome through grinding. An inverse method based on far field for determining material removal amount is presented. Firstly, the inversion model for determining the transmission coefficient is established according to the far field formula. Then the distribution of permittivity is obtained based on the transmission coefficient as well as the shape and thickness of the radome. Finally, a refining method of the integrating meshes of near field that does not increase the radome meshes is proposed to improve the precision of the inversion model. Simulation results of some 1.2 m oval radome verify the correctness and effectiveness of the method.

关 键 词：天线罩 修磨量 反演模型 远场 介电常数 

分 类 号：TN957[电子电信—信号与信息处理]