两种渐消滤波与自适应抗差滤波的综合比较分析   总被引：1，自引：0，他引：1  

杨元喜  高为广 《武汉大学学报(信息科学版)》2006,31(11):980-983

给出了两种渐消滤波解及其相应的原则，介绍了自适应抗差滤波原理和相应的解，分别从原理和解的表达式上分析了两种渐消滤波和自适应抗差滤波解算的基本性能。利用一个实际算例比较了渐消滤波与自适应抗差滤波解在控制状态异常影响方面的能力。  相似文献   

多分类器联合监督分类方法研究     

饶雄  高振宇 《四川测绘》2006,29(1):15-16,14

针对遥感图像监督分类方法适用范围不同且分类机制各有优劣的特点,本文提出将最大似然法与最小距离法结合的监督分类法。对eTM 影像进行分类,结果表明,与单一分类器的分类结果相比,分类器结合的监督分类技术能有效提高遥感图像专题信息提取的精度。  相似文献   

铜川2004-09-14冰雹天气成因分析          下载免费PDF全文

周晓丽  高维英 《陕西气象》2006,(1):9-12

通过分析2004-09-14铜川市中东部地区出现的冰雹天气过程，发现500hPa的高空槽后西北气流中的冷温度槽是主要影响系统，300hPa高空急流和对流层上层200hPa的正涡度大值区以及对流层低层的垂直风切变是对流发生的有利条件，强对流发生在稳定度指数Ky≥2的区域。同时，新一代天气雷达回波图上，云团回波的增强与合并，对于冰雹的落区和降雹时间有很好的指示作用。  相似文献   

使用SVM进行短期气候预测的应用试验     

高宇  燕东渭  杨艳  赵国令  刘志镜 《沙漠与绿洲气象(新疆气象)》2006,29(5):15-16

从气象角度介绍了利用SVM方法的预报原理,对西安短期气候预测做了实验,并分析预报结果,得出SVM方法在天气预报领域有一定的使用空间的结论。  相似文献   

塔城地区近45年气候变化分析   总被引：9，自引：0，他引：9  

高婧  井立军  井立红 《沙漠与绿洲气象(新疆气象)》2006,29(5):17-19

利用1960—2004年气温、降水、初终霜、日照等资料,分析塔城地区气候变化特点。通过分析发现:塔城地区年降水变化不显著;年平均气温以0.46℃/10a的速率变暖,其中冬季变暖最为突出;年平均气温在20世纪60年代中期、60年代末分别发生了一次明显的突变。  相似文献   

省级上行气象信息传输软件的开发          下载免费PDF全文

高宇  夏巧利  杨银见 《陕西气象》2006,(4):23-25

省级上行气象信息传输软件是基于SCO Unix平台开发的，功能包括气象信息的收集、分类打包和发送。软件投入业务运行后，不但简化了上行报的传输流程，提高了上行报的传输时效和传输可靠性，也方便了市、县发报台站的业务人员，还减轻报务员的劳动强度。  相似文献   

自动站数据库接口功能的实现     

李建明  董倩  薛凯  高志强  刘晋生 《气象与环境科学》2006,(3):77-78

介绍了用ASP和SQL数据库来实现山东省自动站数据库接口模块的原理和方法,为自动站数据在业务和科研开发中的应用建立了有效的访问途径.  相似文献   

气象信息网站后台管理技术研究     

王林香  陈爽  高宾勇 《气象与环境科学》2006,(3):78-79

对当前气象信息网站进行概述,就气象网站后台管理的开发应用从结构和技术上进行了分析.  相似文献   

Further Study on Identifying Anomalous Large-Scale Rainfall Regimes in Phase Space          下载免费PDF全文

REN Hongli  GAO Li  ZHANG Peiqun  LI Weijing 《Acta Meteorologica Sinica》2006,20(1):62-71

Using a 40-yr daily precipitation dataset including 134 stations from 1962 to 2001, the large-scale distribution patterns of precipitation anomalies over East China are investigated in the present paper. In the phase space spanned by the first 8 EOFs generated from the 20-day low-pass filtered data, the six rainfall regimes (RRs) are identified by applying a cluster analysis method, namely, the northeastern China regime, Yellow River regime, Qinling Mountain-Huaihe River regime, Yangtze River with its south regime, South China regime, and rainless regime. Analyses show that the new RRs exhibit good persistence and evident physical sense, and excellently represent both of countrywide and regional features, which also demonstrate the inhomogeneity of multi-dimensional phase space. Furthermore, it is more important that the new RRs can describe intraseasonal dynamic characteristics of large-scale rainfall anomalies, which is the most significant difference between the new RRs and the conventional seasonal mean rainfall patterns. On the other hand, the climatic characteristics of daily distributions of the RRs events, as well as the 40-year panorama of the RRs occurring are also investigated, which further document rationality and objectivity of the RRs with intraseasonal variability, and are likely to present more helpful information for short-term climate prediction, compared with other previous classical rainfall patterns.  相似文献   

CLIMATE CHANGE: LONG-TERM TRENDS AND SHORT-TERM OSCILLATIONS   总被引：2，自引：0，他引：2  

高新全  张欣  钱维宏 《热带气象学报(英文版)》2006,12(2):139-149

Identifying the Northern Hemisphere (NH) temperature reconstruction and instrumental data for the past 1000 years shows that climate change in the last millennium includes long-term trends and various oscillations. Two long-term trends and the quasi-70-year oscillation were detected in the global temperature series for the last 140 years and the NH millennium series. One important feature was emphasized that temperature decreases slowly but it increases rapidly based on the analysis of different series. Benefits can be obtained of climate change from understanding various long-term trends and oscillations. Millennial temperature proxies from the natural climate system and time series of nonlinear model system are used in understanding the natural climate change and recognizing potential benefits by using the method of wavelet transform analysis. The results from numerical modeling show that major oscillations contained in numerical solutions on the interdecadal timescale are consistent with that of natural proxies. It seems that these oscillations in the climate change are not directly linked with the solar radiation as an external forcing. This investigation may conclude that the climate variability at the interdecadal timescale strongly depends on the internal nonlinear effects in the climate system.  相似文献