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次声波在非均匀大气中的超视距传播特性研究*
Properties of over-the-horizon propagation of infrasonic wave in the inhomogeneous atmosphere*
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摘要: 本文基于 Nonlinear Progressive Equation (NPE 方程)开展了对非均匀大气中次声波超视距传播特性的研究,通过数值模拟实验对武汉上空四季次声波传播情况以及路径传输损耗进行了模拟,获取了次声波在非均匀大气中的超视距传播特性.计算结果表明,非均匀大气的性质及其中存在的风对次声波传播有明显的影响,平流层折射与风速和声波传播方向密切相关,数值模拟结果表明,当高斯声源主频为0.1 Hz 时,在不同的背景风场传播条件下,存在着两个反射高度,其中40 km 高度反射传输损耗约为25 dB,110 km 反射传输损耗约为50 dB.Abstract: This paper explores the properties of over-the-horizon propagation of infrasonic wave in the inhomogeneous atmosphere using the nonlinear progressive equation (NPE). It has been calculated for propagation and path transmission loss of infrasonic wave all the year round in Wuhan. Results show that it is obviously influenced due to infrasonic wave propagation with properties of the inhomogeneous atmosphere and winds in the inhomogeneous atmosphere. Refraction in stratosphere is related to the speed of winds and propagation direction of infrasonic wave. The minimum propagation loss is achieved when the main frequency of gauss infrasonic wave source is 0.1Hz.
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