中尺度自动气象站故障维护与分析   总被引：9，自引：6，他引：3  

韦信高 《气象研究与应用》2008,29(2):87-88,F0003

针对中尺度自动气象站的构成以及出现的故障现象、故障原因等进行分析,提出故障维护的具体方法与措施,以提高中尺度自动气象设备运行能力。  相似文献   

基于UTC（NTSC）的GPS定时接收机时延测量     

李孝辉  刘阳  张慧君  施韶华 《时间频率学报》2009,32(1):18-21

GPS提供了一种精密定时的方法,但接收机绝对时延的测量是一个难题,现有的测量方法成本高且难以操作,因而提出了一种GPS定时接收机时延测量的简单方法。这种方法根据国家授时中心保持的时间尺度UTC（NTSC）与GPS定时接收机输出的秒脉冲信号（1PPS）的比对结果,利用UTC（NTSC）的国际比对数据以及UTC与GPST的时差数据,可以测量GPS定时接收机时延,该方法简单易行。最后,对这种方法的测量误差进行了分析。  相似文献   

基于MapX的车辆管理系统的开发与研究     

孙庆珍  任忠斌  李宏伟 《测绘与空间地理信息》2005,28(6):31-33

根据某省交通部门对车辆查询和管理服务的实际需求,在GIS与GPS的理论基础上,采用具有强大地图分析功能的MapX和组件技术建立了一个Client／Server模式的GIS与GPS技术相结合的车辆管理系统。简要介绍了该系统的功能和体系结构,并详细讨论了系统实现的关键技术和方法,文章最后对未来的发展趋势进行了分析展望。  相似文献   

GPS干扰和抗干扰技术的研究     

胡彩波  原亮 《测绘与空间地理信息》2005,28(6):36-38

在简要叙述GPS原理、分析GPS弱点基础上,结合伊拉克战争中关、伊两军对GPS的应用及干扰与抗干扰的实施,对GPS深入开展研究,给出了对GPS进行干扰的主要技术方式和提高系统抗干扰能力的主要技术措施。  相似文献   

21世纪GPS技术现代化的特点及应用前景展望     

宫殿明 《测绘与空间地理信息》2005,28(2):30-33

重点介绍了21世纪GPS技术现代化的特点、应用领域,预示了今后GPS的发展方向,并对我国GPS的应用前景进行了展望。  相似文献   

不同采样率下GPS非差相位观测值的周跳探测修复及效果比较   总被引：5，自引：1，他引：4  

喻家碧  孙伟  伍岳 《地理空间信息》2005,3(2):25-26,29

在G PS精密定位中,载波相位观测值周跳探测和修复的好坏程度将直接影响定位结果的精度,特别是实时动态定位(R TK)。文章阐述了几种常规的非差周跳探测方法,在此基础上研究了这些方法在不同采样率情况下的适用度,并通过算例得出了一些有益的结论。  相似文献   

Lithospheric flexure, uplift and expected horizontal strain rate in the Pannonian Carpathian region     

Alessandro Caporali   《Tectonophysics》2009,474(1-2):337

The Apuseni Mountains are located between the Pannonian Basin and the Transylvanian Basin along a direction of SE convergence with the Carpathian belt. A flexural model based on the cylindrical bending of a semi-infinite, isostatically supported, thin elastic plate is here examined with the Apuseni playing the role of flexural bulge, and under the assumption that the plate is deforming under the action of a vertical shear force and a bending moment applied at the end of the plate, beneath the Carpathians. The model yields estimates of the plate thickness ranging between 13 and 14.5 km, depending on the assumed density contrast between crust/sediments and mantle providing buoyancy. The vertical shear force which is necessary to bend the plate is in the range between 60 and 300 × 10¹¹ N m^− 1, depending on the assumed density contrast. This force is shown to be modelled by a gravitational ‘slab pull’ force, using model parameters derived from seismic tomography. If the height of the flexural bulge, after correction for erosion, is allowed to increase, the model yields an estimate of the horizontal strain rate at the top of the bulge. For example, 5 mm/yr vertical change of the flexural bulge of a 14 km thick plate results in a horizontal deformation rate of approximately 7 nanostrain/yr at the top of the bulge, a value which is at the threshold of sensitivity of continuous GPS measurements. Different vertical rates will change the horizontal strain rate almost proportionally.  相似文献   

Trace elements in world steam coal and their behaviour in Dutch coal-fired power stations: A review     

R. Meij  B.H. te Winkel 《International Journal of Coal Geology》2009,77(3-4):289-293

Trace elements associated with the combustion of coal have received more attention recently, as can be seen from the increasing demands laid down in legislation and permits.Knowledge of the trace element content of coal is essential. Coal used in the Netherlands is imported from all over the world. As a consequence, Dutch power stations are designed to burn a wide range of bituminous coals. The largest share nowadays originates from South Africa, Colombia, and Indonesia, with these three countries accounting for more than 85% of the coal fired in the Netherlands in recent years. The coals, as imported in the Netherlands, have been monitored for their (trace) element content. At present the database contains results of own analyses of about 170 coals, originating from 14 different countries. An important uncertainty was the question of how homogeneous the imported lots are. It appears that the lots as imported from overseas are fairly homogeneous.The behaviour and fate of trace elements in coal-fired power stations has been studied in more than 40 mass balance studies since 1977. More than 50 test series have been completed during co-combustion of biomass and waste materials (up to 40% on mass base) since 1993. It has therefore been possible to establish a relationship between (trace) elements in the fuel and the ash, as well as with emissions into the atmosphere.  相似文献   

道路工程平面坐标系的统一性理论研究     

范东明  苏勇  黄强  贺全兵  游为 《四川测绘》2011,(3):99-102

传统上道路工程勘测、设计、施工各单位统一采用以初测导线点处垂线为基准线、水准面为基准面的,把各相邻测站处局部水准面相连拼接成一个统一带状的平面坐标系统（定义为道路工程渐变平面坐标系）。本文提出顾及地球重力场模型,用GPS直接建立垂线和水准面系统的道路工程渐变平面坐标系的解决方案,从理论上统一了勘测坐标系（GPS平面坐标系）和设计、施工坐标系（道路工程渐变平面坐标系）,消除了其间存在的系统误差。  相似文献   

时间跨度对GPS坐标时间序列噪声模型估计影响分析     

马梦然  贺小星  花向红  舒颖  龚果栋 《测绘工程》2017,26(5)

文中介绍GPS坐标时间序列模型,并给出GPS噪声模型种类、估计方法及最佳噪声模型评价准则。选取来自IGS08的24个IGS核心站的时间序列作为数据基础,对不同时间跨度的时间序列噪声模型进行定量分析,探讨其随着时间变化的演化规律。结果表明:当时间序列长度较短时,噪声模型的不确定性较大,而12.5a以上时间跨度的噪声模型趋于稳定且主要表现为闪烁噪声加白噪声的组合噪声模型;大跨度时间序列中噪声的长周期分量变得显著。  相似文献