二维傅立叶相位导风技术的研究

【作者】 张红；

【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， 2004， 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，对一维傅立叶相位导风技术进行理论推导和误差分析；第三章基于一维傅立叶相位法导风，给出二维傅立叶相位法导风的理论分析，并对该算法进行了改进，加入了快速傅立叶算法。模拟模块内各点的速度线性变化时，得到空间域平均速度以及频率域以振幅为权重的平均速度，分析了空间域平均速度和频率域以振幅为权重的平均速度的关系，并揭示空间域的平均速度的标准差σ_x和频率域的振幅为权重的平均速度的标准差σ_v的意义，以及它们之间的关系；第四章介绍了云迹风系统的高度指定以及风矢高度的划分，并根据风场连续性原理，介绍了高度调整法的质量控制；第五章介绍导风系统的流程，选择了三个时刻的IR云图，分别用一维傅立叶相位法、二维傅立叶相位法和快速傅立叶算法计算一个风场个例，并对所得风场进行质量控制，并给出风场图；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 is introduced and the significance of the Fourier phrase analysis technique was given. In the second part, based on fluctuation theory and Fourier phrase analysis, the one-Dim Fourier analysis technique on cloud motion winds is deduced, and the error of the technique is analyzed. In the third part, basing on the one-Dim Fourier phrase analysis technique, the two-Dim Fourier phrase analysis technique is given, and improved the arithmetic of fast Fourier transform (FFT). By simulating mathematically on frequency and on space, we can find the average speed of space field and the average speed of frequency field that is weighted by amplitude, and analyse their relation, and analyse the meaning of space speed variance x and frequency speed variance V. In the fourth part, how to ensure the height of cloud is introduced, and basing on the theory of wind field continuity, the height updating quality controlling is introduced. In the fifth part, the system of cloud wind is introduced, we tracked cloud-motion of consecutive satellite images with one-minute interval by the 1-D Fourier analysis technique and the two-Dim Fourier analysis technique and the FFT analysis technique, and dispose them with quality controlling. In the sixth part, we summarized our research and put up with shortages of this article.更多还原