CAJ | 학술논문

采用指数型分布粗糙面模拟实际的粗糙地面，运用 FDTD 方法研究了超宽带高斯脉冲电磁波入射粗糙地面时的宽带前向电磁散射问题；通过数值计算得到前向散射系数随频率的变化曲线，并与时谐场源激励下的结果进行了对比；分析了不同的粗糙地面高度起伏相关长度、均方根高度，土壤湿度和入射角下前向散射系数随频率的变化关系，得到了指数型分布粗糙地面的宽带前向电磁散射特性。数值计算结果表明各参数的变化对前向电磁散射系数的影响比较明显，入射波不同极化方式下的前向散射系数也有显著变化。
채용지수형분포조조면모의실제적조조지면，운용 FDTD 방법연구료초관대고사맥충전자파입사조조지면시적관대전향전자산사문제；통과수치계산득도전향산사계수수빈솔적변화곡선，병여시해장원격려하적결과진행료대비；분석료불동적조조지면고도기복상관장도、균방근고도，토양습도화입사각하전향산사계수수빈솔적변화관계，득도료지수형분포조조지면적관대전향전자산사특성。수치계산결과표명각삼수적변화대전향전자산사계수적영향비교명현，입사파불동겁화방식하적전향산사계수야유현저변화。
The actual rough land surface is simulated with the exponential type distribution rough surface,the wide-band forward electromagnetic scattering from rough land surface under UWB Gaussian pulse electromagnetic wave incidence is studied using FDTD.The curves of forward electromagnetic scattering coefficient varied with frequency are obtained by numerical calculation,and compared with result under harmonic field source.The forward electromagnetic scattering coefficient varying with frequency is analyzed under the difference of the correlation length and the root-mean-square of rough land height fluctuation,the moisture capacity of soil,the incidence angle.The characteristics of the wide-band forward electromagnetic scattering from rough land surface are obtained.The numerical results show that the influence of various parameters on the forward electromagnetic scattering coefficient is obvious.Moreover,forward scattering coefficient with the changes of the incident polarization modes is also significantly different.