一维带限Weierstrass分形海面电磁散射的矩量法研究

Study on Electromagnetic Scattering from 1D Band-limited Weierstrass Fractal Rough Sea Surface Using the Method of Moments

采用一维带限Weierstrass分形函数来模拟实际的分形海面,依据海水的介电特性,运用矩量法研究了锥形波入射一维带限Weierstrass分形海面的电磁散射特性。通过数值计算得到了散射系数随散射角的变化曲线,讨论了风速、分维、海水盐含量、入射波频率对散射系数的影响,得到了一维带限Weierstrass分形海面散射系数的基本特征、分形特征和随频率变化特征。结果表明,风速、分维和入射波频率对散射系数有显著影响,而海水盐含量对散射系数的影响较小。

A 1D band-limited weierstrass fractal function is used to simulate the practical fractal sea surface.Based on the brine dielectric properties , the electromagnetic scattering from 1D band-limited weierstrass fractal rough sea surface with the tapered wave incidence is studied using the method of moment. The curves of electromagnetic scattering coefficient with scattering angle are obtained by numerical calculation. The effects of the wind speed, the fractal dimension, the salt content of sea and the frequency of the incident wave on the scattering coefficient are discussed. The basic characteristics, the fractal characteristics and the characteristics with varying of fre- quency of scattering coefficient from 1D band-limited Weierstrass fractal rough sea surface are also obtained. The results show that the effect of the wind speed, the fractal dimension and the frequency of the incident wave on the scattering coefficient of the rough surface is obvious while the influence of the salt content in sea is smaller.