CAJ | 학술논문

利用小斜率近似方法计算了起伏海面的声散射特性,得到了具有高斯分布粗糙海面的平均反射系数(即镜反射系数)计算公式,并与微扰法和Kirchhoff近似做了比较,结果表明小斜率近似是一种非常有效的分析起伏表面散射特性的近似方法.最后讨论了海面镜反射系数随海面的不平整度(波浪的均方根高度)、声波频率和声波入射方向的变化关系,得出了只有在声波波长和起伏波浪高度可比拟时,才有明显的镜反射的结论.这为分析浅海目标声散射特性时,选择是否需要考虑海面(海底)所引起的多途效应提供了理论依据.
이용소사솔근사방법계산료기복해면적성산사특성,득도료구유고사분포조조해면적평균반사계수(즉경반사계수)계산공식,병여미우법화Kirchhoff근사주료비교,결과표명소사솔근사시일충비상유효적분석기복표면산사특성적근사방법.최후토론료해면경반사계수수해면적불평정도(파랑적균방근고도)、성파빈솔화성파입사방향적변화관계,득출료지유재성파파장화기복파랑고도가비의시,재유명현적경반사적결론.저위분석천해목표성산사특성시,선택시부수요고필해면(해저)소인기적다도효응제공료이론의거.
Acoustic scattering from the rough surface by the small-slope approximation theory is studied, and the coherent reflection coefficient (that is, the specular reflection coefficient) of the rough sea surfaces which has a Gaussian spectrum is derived. The results by the small slope approximation are also compared with the perturbation and Kirchhoff approximation, and show that the small slope approximation is an efficient method to deal with the acoustic scattering from the rough surface. The change of the specular reflection coefficient with the rms surface slope, frequency and incident angle is discussed, and it is concluded that an obvious specular reflection appears just when the wavelength can be matched with the wave height. This gives the theoretical basis whether the multi-path effect needs to be considered while analyzing the target scattering in shallow sea channel.