GPS水准高程拟合的应用探讨

随着GPS技术的应用和发展,在高程测量中,GPS技术也充分得到了应用。本文论述GPS高程拟合应用中的一些体会。     

GPS水准高程拟合的应用探讨

随着GPS技术的应用和发展,在高程测量中,GPS技术也充分得到了应用。文中论述GPS高程拟合应用中的一些体会。     

工程测量中GPS控制测量平面与高程精度的研究

随着当代信息技术以及科学水平飞速发展,GPS技术应运而生,并未广泛应用于社会的各个领域。在现阶段的工程测量当中,GPS控制测量已经基本替代了以往的常规测量方案。尽管GPS优势突出,但是其也存在着一定的不足,和传统的测量手段相比,其直观性稍逊色一些,而且在高程测量方面的误差比较明显。首先概述了GPS控制测量技术的应用现状,并列举了有关实例,然后分析了工程测量中影响GPS控制测量平面和高程精度的主要因素,并制定了提升高程测量精度的具体方案。     

GPSurvey拟合测区似大地水面的可行性与应用方法

文中就GPSurvey随机软件自动拟合测区似大地水准面的功能，利用大同机场控制点补测水准测量资料和GPS测量资料作试验，得出通过GPS网高程约束平差获得待定GPS点高程，在实际作业应用中是可行的、可靠的。     

EGM2008模型在河道GPS高程控制测量中的应用

目前,较高精度的地球重力场模型被用来将GPS确定的大地高转换为正常高,以取代高劳动强度、低效率的传统测量方法。文中结合工程实例,以四等水准测量成果为参考值,计算并对比分析几种高程测量方法的精度,结果表明:基于EGM2008模型的GPS高程控制测量方法达到了四等水准的精度水平,可以替代四等水准测量,实现GPS技术在河道工程中平面和高程控制测量的一体化应用。     

基于神经网络的GPS高程转换

GPS测量所提供的高程为相对于WGS-84椭球的GPS大地高,而国内使用的是正常高。大地高等于正常高与高程异常之和,要使GPS高程在实际工程中得到应用,就必须先求出高程异常,进而获得正常高。为此,提出一种改进的BP网拓扑结构和算法来转换GPS高程为正高或正常高,并用GPS的实测数据样本进行计算和分析。结果表明,利用神经网络方法转换的GPS高程的精度比常用的二次多项式曲面拟合法高,且转换精度也较稳定。     

GPSurvey拟合测区似大地水准面的可行性与应用方法

文中就GPSurvey随机软件自动拟合测区似大地水准面的功能，利用大同机场控制点补测水准测量资料和GPS测量资料作试验，得出通过GPS网高程约束平差获得特定GPS点高程，在实际作业应用中是可行的、可靠的．     

GPS在矿区高程控制中的研究与应用

通过对GPS高程拟合与几何水准高程的比较与分析,在绘制矿区地形图中,完全可以用GPS高程替代传统的几何水准高程,在矿区高程控制中有着广泛的应用前景,具有一定的社会效益和实用价值。     

GPS高程转换模型及精度评估

该文通过采用二次曲面、多面函数和RBF神经网络转换模型,对某测区的GPS/水准数据进行高程转换及结果分析,探究GPS高程转换模型在工程应用中的可行性及精度。结果表明,在区域范围较小的地区,采用RBF神经网络模型要优于二次曲面和多面函数高程拟合模型。通过本次对比分析为RBF神经网络模型在高程转换中的应用积累了经验。     

某名山海拔高程的确定

通过对某名山主峰高程测量工程的实例,论述了测量中的高程处理方法,GPS技术和似大地水准面精化技术在推进测绘成果社会化的应用,随着GPS技术、似大地水准面模型等成果的应用,对国家名山高程数据的获得已变得更准确、快捷、经济。     

Current situation and future trend of China rare earth luminescent material industry

<正>Rare earth luminescent material is one of the most important application sectors of rare earths.China enjoys the exceptional advantage to develop rare earth luminescent material for its abundant rare earth resources.After several decades'endeavor,China's rare earth luminescent material industry,headed by rare earth phosphor for lamp and LED and high efficient rare earth energy-saving light source,has been gradually developed into a scale industry.China has become a major production base of rare earth phosphor for lamps and rare earth     

China rare earth market review

正June 1~10,2014Rare earth market remained weak.Quoted price of rare earth products was similar to that in May.There was no sign of recovery in downstream market.The market of NdFeB magnetic materials and phosphor was depressed.Catalyst,polishing powder and ceramic industries remained inactive.Demand from downstream industry was soft.Consumers purchased on their needs.Suppliers had strong intention to sell.Prices of rare earth products     

Annual Report analysis of Chinese rare earth-related listed companies in 2013

<正>Chinese rare earth-related listed companies have published their 2013 annual reports.It can be understood from their reports that production and operation activities of Chinese rare earth-related companies were still heavily affected by macro economy and industrial policies.They basically followed the steps of national economy.In 2013,world economy recovered slowly but the economy     

Market opportunities and challenges for rare earth polishing powder

正1.Status of rare earth polishing powder Rare earth polishing powder with high content of cerium oxide began to replace iron oxide for glass polishing and became one of the key materials in glass polishing process since 1940.Compared with traditional iron oxide,rare earth polishing powder has many advantages,such as fast polishing rate,high polishing quality and long service life.It can achieve good surface quality and improve operation conditions.For example,in lens polishing,the polishing work that cerium     

Baotou Research Institute of Rare Earths developed a new RE alloy preparation technology

正Pyrometallurgy Laboratory of Baotou Research Institute of Rare Earths had independently developed a new preparation technology of rare earth alloy for NdFeB.The alloy can remarkably enhance the coercivity of NdFeB magnet but also evidently reduce the production cost of the magnet.The new master alloy was prepared in the kA pilot-scale electrolytic cell by the independent technology.The rare earth master alloy can be used as the raw material for NdFeB.Compared     

Market and recycling of NiMH battery

<正>Market status and future trend of NiMH battery1.Global market of small NiMH battery Global market size of small NiMH batteries declined year on year since 2011.The trend will continue to 2018,at the rate of 5%to 10%annually.Demand for small NiMH batteries will be stable gradually.Many electrical apparatuses are powered by the built-in lithium battery today,which is the main reason for the shrunk market of small NiMH batteries.But,for some products,small NiMH     

China rare earth market review

正September 1-10,2014 Affected by the National Day holiday,rare earth transaction was stagnant and the market showed a weak steady state.As there was no good news for downstream market,some products with flat demand would likely rally slightly for some time to     

2014 second batch of rare earth quota released

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矿用防爆轴流对旋主要通风机叶片ANSYS模态分析及应用

高效节能矿用防爆对旋主要通风机的叶片是主要通风机运行的关键部件,叶片在运行时不断受到气流的作用力,从而使叶片产生振动,当叶片振动的频率与叶片的固有频率接近时,容易产生共振从而导致叶片的断裂。一旦叶片断裂时,对主要通风机的安全运行产生致命的影响,从而导致矿山、化工等企业发生重大事故,将会产生不可估量的损失。基于有限元分析软件ANSYS,对高效节能矿用防爆轴流对旋主要通风机叶片进行模态分析及产生对应的六阶模态频率,对主要通风机叶片的运行频率、固有频率及产生的共振问题进行了原理分析,并且解决了叶片频率共振的问题,从而为主要通风机叶片结构设计提供理论依据,并对主要通风机叶片的安全运行提供保障。     

2013 NdFeB export analysis

<正>China totally exported nearly 24,000 tonsof NdFeB products during 201 3,including 18,825 tons of permanent magnet,valued USD 1.34 billion at an average price of 71.4 USD/kg;3,277 tons of NdFeB magnetic powder,valued USD 1 01 million at an average price of 30.9 USD/kg;1,334 tons of strip casting ribbon,with total export value of USD 74million at an average price of 55.3 USD/kg;and 586