弯折谱估计在抛物型方程模型电波传播中的应用研究

Application of cured wave spectral estimation in wave propagation with parabolic equation model

射线追踪法求解入射余角时与电波频率无关,且存在部分区域多值或无值问题,此外平面波谱估计的平面波前假设违背了非均匀大气条件下的电波传播特性.针对上述问题,提出了一种基于弯折谱估计进行抛物方程模型海面电波传播的计算方法.通过对光滑表面条件下的抛物方程模型计算结果进行弯折谱估计得到入射余角,再将其用于粗糙海面的抛物方程模型求解.该方法可以唯一的估计任意距离上的入射余角,避免了计算当前值需要用到基于该值估计参数的悖论.对射线追踪法、平面波谱估计和弯折谱估计的估计特性进行了仿真分析,数值试验验证了该方法应用于粗糙海面抛物方程求解的可行性和性能.

Grazing angles obtained by ray tracing(RT)have nothing to do with wave length,and may give multi-values or none in some areas.The plane wavefronts assumption of plane wave spectral estimation(PWS)violates the characters of wave propagation in inhomogeneous atmosphere.A parabolic equation model(PE)model based on the cured wave spectral estimation(CWS)is proposed for the wave propagation computation on rough sea surface.Grazing angles are estimated with the CWS from the PE outcomes on smooth surface,and then PE on rough surface can perform with them.With the new method,grazing angle can be uniquely obtained at arbitrary distances,avoiding the paradox of a chicken-and-egg problem.Performances of RT,PWS and CWS are simulated and analyzed.Performances and feasibility of the new method is checked on rough surface PE with numerical experiments.