台阶目标电磁散射特性研究

 通过系列雷达散射截面（RCS）测试，研究了单台阶板随台阶高度变化的规律，分析了多台阶板电磁散射与其高度、间距、极化方式之间的变化关系，并将台阶板散射结果与金属平板结果进行比较，定量总结了各参数对台阶板散射的影响。试验结果表明，台阶高度增加导致散射增强；多台阶间距增大引起曲线振荡增强，说明台阶间耦合作用加强，但RCS均值相对于平板均值增幅不变；多台阶散射表现为各台阶在不同相位上相互叠加的结果。

Analysis of Electromagnetic Scattering Characteristics of Steps

The variation rule between a single-step plate and its step height was studied by a series of radar cross section(RCS) testings in resonance region and optical region.By changing the height,interval of steps on the multi-step plate and polarization of incidence wave,the relation between scattering and the parameter from multi-step plate was obtained.These curves were compared with a non-step plate and the effects of above parameters on RCS was explored with quantitative analysis.The results show that: the step height increase enhances the scattering for both single step plate and multi-step plate,the RCS curves change more greatly when step the interval is larger and its average incremen,and the keep invariable;scattering from multi-step is the coupling of all single-step effects at different phases respectively.When the height of single step and the interval of multi-step increase,their scattering amplitudes of horizontal polarization are higher than that of vertical polarization.All these curves show weakly symmetry in the test.This conclusion can find its application to improve the stealth performance of aircraft.