【作者】 许建明；

【导师】 王振会；

【作者基本信息】 南京气象学院 ， 大气物理学与大气环境， 2003， 硕士

【摘要】 本文由六章组成，第一章介绍云导风技术的研究进展和傅立叶导风技术的研究意义；第二章以波动理论和傅立叶变换为基础，对傅立叶相位导风技术进行理论推证和误差分析，通过模拟分析了空间域和频率域的导风特点，揭示了在导风过程中出现的相位重叠和频谱混叠两种现象；第三章通过计算在空间域速度线性变化情况下频率域振幅权重平均速度(?)和空间域平均速度(?)之间、频率域速度标准差σ_f和空间域速度标准差σ_x之间的关系，揭示(?)和σ_f在导风过程中所代表的物理意义和实用价值；第四章介绍导风系统的流程，给出用傅立叶相位法对连续两幅云图导风的具体算法；第五章分别用相关系数法和傅立叶相位法计算了一个风场个例，通过与欧洲中心提供的风场数据进行点对点比较，发现傅立叶相位法计算的风速要好于相关系数法计算的风速，而两种方法得到的风向较为一致；第六章进行研究总结，指出不足和有待于进一步研究之处。更多还原

【Abstract】 This article is composed of six parts. In the first part, the research progress of cloud motion wind was introduced and the significance of the 1-D Fourier analysis technique was given. In the second part, based on fluctuation theory and Fourier analysis, the one dimension Fourier analysis technique on cloud motion winds is deduced and demonstrated theoretically. By simulating mathematically on frequency and on space, we not only uncovered two questions in practice, first is phrase folding, second is frequency spectrum overlapping, but also gave methods and suggestions to solve them or avoid them. In the third part, we analyzed the relations not only between space average speed v andamplitude-weighted average speed v, but also between space speed variance σx and frequency speed variance σf. By comparing the relations, the practical meanings of vand σf in tracking cloud motion are found out. In the forth part, the system of cloudwind was introduced and the algorithms of tracking cloud motion with two sequential satellite images by the 1-D Fourier analysis technique was given. In the fifth part, we tracked cloud-motion of consecutive satellite images with one-minute interval by maximum correlation matching technique and the 1-D Fourier analysis technique. Compared with the data provided by Eumatsat, the velocities which are computed by the 1-D Fourier analysis technique are better than that computed by the maximum correlation matching technique. The directions got by two techniques are approximately uniform. In the sixth part, we summarized our research and put up with shortages of this article.更多还原