近远场变换技术在目标特性测试中的应用

Application of near-far field transform technology in target characteristics test

对近远场变换技术在目标特性测试中的应用进行了研究,通过对飞机模型的仿真结果进行近场成像处理、远场计算重构以及卷积积分修正等处理,可将近场散射变换到远场。同时,近远场变换技术能够有效解决在不满足远场条件下测量雷达散射截面积(RCS)时遇到的问题。通过对金属导体圆柱、导弹模型、常规飞机模型、角反射器等进行RCS测试,并对单柱面紧缩场与平面波紧缩场的RCS测试结果进行对比,得到近远场变换技术适用于那些采用隐身减缩技术的目标体,具有对测量数据进行一定程度的修正及提升测试精确度的效果。但对于未采取隐身措施的目标,近远场变换技术则完全不适用。

The application of near-far field transform technology in target characteristics testing is studied.By performing near-field imaging processing,far-field calculation and reconstruction,and convolution integral correction on the simulation results of the aircraft model,the near-field scattering can be transformed into the far-field.At the same time,the near-far field transform technology can effectively solve the problem encountered when measuring the Radar Cross Section(RCS)under the conditions not satisfying the far-field.By RCS tests on metal conductor cylinders,missile models,conventional aircraft models,angle reflectors,etc.,and comparing the RCS test results of the single cylinder compression field with that of the plane wave compression field,it is obtained that the near-far field transform technology is suitable for those targets using stealth reduction technology,showing the effects of correcting the measurement data to a certain extent and improving the test accuracy.Nevertheless,the near-far field transform technology is completely unsuitable for those targets without taking stealth measures.