利用X波段雷达提取海浪信息的分析   总被引：2，自引：0，他引：2  

楚晓亮  徐铭  王峰  王剑 《中国海洋大学学报(自然科学版)》2011,41(5):110-113

利用X波段雷达海浪信息提取系统,通过对龙口屺姆岛海域岸基试验数据分析,获得了有效波高、主波频率、主波波向等海况参数,并和该区域的浮标数据进行了比较分析,结果表明利用X波段雷达系统能够有效地获得海况信息。  相似文献   

基于小波变换的海洋平台损伤检测研究     

林裕裕  王典鹤  王树青  王森 《中国海洋大学学报(自然科学版)》2011,(Z1):413-419

当结构物产生损伤时,结构的动力特性会发生变化,从而引起结构振动响应产生相应的变化。小波变换是奇异性信号的良好检测工具,可以用于识别结构损伤的发生。建立了某海洋平台有限元模型,得到了随机海浪作用下不同损伤工况的结构振动响应。基于小波变换损伤检测,针对不同类型杆件损伤、不同位置杆件损伤、不同程度的噪声污染以及不同方向振动响应信号情况下,分别研究了海洋平台结构的损伤检测问题,得到了一些有用的结论。  相似文献   

Deriving Temporal and Vertical Distributions of Methane in Xianghe Using Ground-based Fourier Transform Infrared and Gas-analyzer Measurements     

Denghui JI  Minqiang ZHOU  Pucai WANG  Yang YANG  Ting WANG  Xiaoyu SUN  Christian HERMANS  Bo YAO  Gengchen WANG 《大气科学进展》2020,37(6):597-607

Methane(CH4) is one of the most important greenhouse gases in the atmosphere, making it worthwhile to study its temporal and vertical distributions in source areas, e.g., North China. For this purpose, a ground-based high-resolution Fourier transform infrared spectrometer(FTIR), the Bruker IFS 125 HR, along with an in-situ instrument, the Picarro G2301, were deployed in Xianghe County(39.8°N,117.0°E), Hebei Province, China. Data have been recorded since June2018. For the FTIR measurements, we used two observation modes to retrieve the mole fraction of CH4: the Total Carbon Column Observing Network(TCCON) method(retrieval algorithm: GGG2014), and the Network for the Detection of Atmospheric Composition Change(NDACC) method(retrieval algorithm: SFIT4). Combining FTIR with in-situ measurements, we found the temporal and vertical distributions of atmospheric CH4 within three vertical layers(near the ground, in the troposphere, and in the stratosphere), and throughout the whole atmosphere. Regarding the diurnal variation of CH4 near the ground, the concentration at night was higher than during the daytime. Regarding the seasonal variation,CH4 was low in spring and high in summer, for all three vertical layers. In addition, there was a peak of CH4 in winter near the ground, both in the troposphere and the whole atmosphere. We found that variation of CH4 in the tropospheric column was close to that of the in-situ measurements near the ground. Furthermore, the variations of CH4 in the stratospheric column could be influenced by vertical motions, since it was higher in summer and lower in winter.  相似文献   

基于DCT变换的多光谱与全色影像融合方法     

黄登山  杨敏  赵玲 《地理与地理信息科学》2011,27(3)

针对IHS融合法的融合影像相对于原多光谱影像光谱扭曲严重、小波变换融合法运算量大的缺点,依据影像成像时传感器像素间的对应关系,提出应用遥感影像空间分辨率比值关系对影像进行分块,采用离散余弦变换与IHS变换相结合的融合方法进行多光谱影像与全色影像融合,以提高遥感影像的应用能力。仿真实验表明,该方法融合结果的光谱保持性与小波变换方法相近,均优于IHS变换融合影像,对全色影像空间信息集成能力稍弱,但计算效率明显改善,适合于对大数据量的遥感影像融合。  相似文献   

气、水、岩、生、人相互作用及其环境效应     

孙建中 《地球科学与环境学报》1993,(Z2)

这里所指示的大气圈、水圈、岩石圈、生物圈以及人类的作用千变万化,从而对人类的生存造成巨大影响,构成了一个复杂的生态环境,讨论这些问题,对人类生存至关重要。  相似文献   

Romberg算法和Matlab的综合应用精确计算精密光学器材的体积     

苟智坚  郑丰华  杨孝春 《成都信息工程学院学报》2007,22(3):384-387

实际工程应用中,对复杂形体实现高精度高效率的体积运算比较困难,通过在完成国内某大型光学产品公司的报价系统的过程中,综合运用Romberg计算方法和Matlab软件工具,找到了一种用三重积分来计算较复杂形体体积的方法.  相似文献   

断层网络方向特征及其自组织演化     

黄清华 《大地测量与地球动力学》1994,(4)

断层网络可视为一浅源构造地震的蕴震系统。地震前兆是该系统在演化过程中所表现出来的复杂的整体动态行为，是蕴震系统自组织演化的构造微动态。本文从信息合成观点出发，提出了方向信息合成方法（ＤｉｒｅｃｔｉｏｎＩｎｆｏｒｍａｔｉｏｎＳｙｎｔｈｅｓｉｓ）。对京、津、唐地区５０条跨断层地形变观测时间序列的计算表明：断层网络活动的方向特征（相对张、压、扭动等）临震前出现了运动方式（方向）群体优势异常；该异常可能具有可重复性，该方向特征的时空演化可视为一个自组织过程。  相似文献   

秦、祁、昆三大造山带的结合特征     

孙延贵  田琪 《青海国土经略》2001,(1)

秦、祁、昆三大造山带结合地区的物质组成及结构特征显示,其间存在不同时期发育起来的陆缘、陆内转换断层,受其制约,造山带内曾发生大规模侧向运动和由此引起的岩心活动及复杂的构造变形。据此,结合演化可分三阶段,并且秦、祁、昆三大造山带间并不存在东西向贯通的单一结合带,而是在转换断层作用下,分阶段逐步完成了转换结合的结合方式。  相似文献   

Frictional contact of laminated elastic half‐spaces allowing interface cavities. Part 2: Numerical results     

A. A. Kryshtafovych  S. J. Matysiak 《国际地质力学数值与分析法杂志》2001,25(11):1089-1099

The paper presents some numerical results of the problem on contact of stratified elastic half‐spaces possessing unevenness of their surface layers. The approach of the Jacobi polynomials is used to reduce the singular integral equation of the problem to a system of linear algebraic equations. On the basis of the system's solution the dependence of gaps' geometric characteristics on external load and friction is investigated for two types of initial boundary disturbances, namely a local symmetric recess and a periodic set of recesses at a flat boundary. Numerical results are presented in figures for a few elastic and geometric parameters of joint components. The analysis shows that elastic properties and geometric structure of a laminated half‐space have a significant influence on the shape of interface gaps and their location. Copyright © 2001 John Wiley & Sons, Ltd.  相似文献   

小波方法在CCD图像处理中的应用     

訾丽萍  乔荣川  刘建荣 《时间频率学报》2003,26(1):69-74

针对天王星卫星位置观测图像中存在的一些问题,提出了一种新的图像处理方法,即二维墨西哥帽小波变换方法.图像处理结果表明,这种方法能够有效地去除背景梯度和噪声,将接近主星的卫星从主星的光晕中分离出来.  相似文献