Simulating acoustic scattering from atmospheric temperature fluctuations using a k-space method.
Simulating acoustic scattering from atmospheric temperature fluctuations using a k-space method.
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DOI：
10.1121/1.4835955
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发表时间：
2014-01
期刊：
影响因子：
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通讯作者：
J. Hargreaves;P. Kendrick;Sabine von Hünerbein
中科院分区：
文献类型：
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作者：
J. Hargreaves;P. Kendrick;Sabine von Hünerbein
本文描述了一种数值模拟小区域非均匀温度起伏远场散射的方法。这种散射是令人感兴趣的，因为它是声学风速剖面仪（多普勒声达）接收后向散射的机制。因此，该方法可用于更好地理解在操作中的散射机制，并可能最终提供一个数值试验台，用于开发改进的SODAR信号和后处理算法。该方法结合了分析入射声模型与k空间模型的散射声接近的非均匀区域和近远场变换，以获得远场散射图案。从两个测试案例的气氛中的结果：一个周期性的温度波动与高度和随机温度波动的Kolmogorov谱。与理论预测的远场散射和多频声雷达设计的影响进行了讨论。
This paper describes a numerical method for simulating far-field scattering from small regions of inhomogeneous temperature fluctuations. Such scattering is of interest since it is the mechanism by which acoustic wind velocity profiling devices (Doppler SODAR) receive backscatter. The method may therefore be used to better understand the scattering mechanisms in operation and may eventually provide a numerical test-bed for developing improved SODAR signals and post-processing algorithms. The method combines an analytical incident sound model with a k-space model of the scattered sound close to the inhomogeneous region and a near-to-far-field transform to obtain far-field scattering patterns. Results from two test case atmospheres are presented: one with periodic temperature fluctuations with height and one with stochastic temperature fluctuations given by the Kolmogorov spectrum. Good agreement is seen with theoretically predicted far-field scattering and the implications for multi-frequency SODAR design are discussed.