Statistical Characteristic of Scattering From Randomly Rough Surfaces
An analytical expression for the fourth order moment of the plane wave scattering from two-dimensional randomly rough surface with small roughness is presented based on the Kirchhoff and physical optics approximation. The fourth order moment has been simplified to get the two-position and two-frequency mutual correlation function. With the incidence wavelength 1.06μm and different root-mean-square (rms) heights,the distributions of FOM changing with the coherence bandwidth frequency difference and scattering angles have been given. It is shown that the rms height of rough surface greatly influences on results and the scattered FOM mainly comes from the specular direction and zero frequency difference with small rms height,if the frequency difference is greater than zero,FOM will quickly decreases to zeroInother directions; while at zero frequency,with the increase of rms height,there is also the biggest value which is smaller than that with smaller rms height,and the valueInspecular direction decreases but others increase,which we call speckle effect.Inaddition,the increase of rms height results inthe correlation bandwidth narrowing.
Zhang Geng Wu Zhensen Zhang Hanlu
Science School,Xidian University,Xian,710071,China
国际会议
2008 International Conference on Microwave and Millimeter Wave Technology(2008国际微波毫米波技术会议)
南京
英文
991-994
2008-04-21（万方平台首次上网日期，不代表论文的发表时间）