动态GPS(RTK)测量的精度分析

通过动态GPS(RTK)测量和静态GPS测量成果的比较分析,对影响GPS(RTK)测量精度的因素有了充分的了解.总结了影响动态GPS(RTK)精度的原因及解决方法.分析研究表明,动态GPS(RTK)测量平面精度可达到一级导线测量的要求,高程精度可达到等外水准的要求.     

无约束平差GPS网与GPSRTK图根点的施测

阐述了无约束平差GPS网的建立及GPS RTK图根点的施测方法。对起算数据的精度进行了探讨,将实时动态观测图根点的成果与静态观测成果加以比较,并进行了精度分析。     

CORS网流动站在地表变形监测中的可行性研究

GPS定位系统CORS网的建成,为煤炭开采地表沉陷观测提供了新的工具,本文简要介绍了GPS定位系统、RTK流动站、CORS网流动站的基本原理,测试了美国光谱EPOCH35双频GPS仪器系统,分析了观测精度,并与地表移动观测站观测成果精度进行了对比,得出了CORS网流动站可以应用于地表移动观测站观测。     

基于RTK加密的GPS工程平面控制网布设

随着RTK技术的普及,基于RTK加密的GPS工程平面控制网的布设已成为一个具有重要现实意义的技术问题。基于此,研究了控制网的基本单元图形以及实际作业中应如何保证网的精度和可靠性等问题。为了估算控制网的精度,使用蒙特卡罗法得到单位权中误差,并得出具有实际意义的精度指标主要包括边长相对中误差、点位绝对中误差和相对中误差,最后给出了一个基于RTK加密的GPS工程平面控制网的布设实例。     

小区域GPS-RTK高程拟合及精度分析

文中介绍了全球定位系统实时动态测量(GPS RTK)高程拟合的理论方法和数学模型,结合工程实例和实验数据对GPS RTK高程拟合的结果和精度进行了分析,提出了一些改进GPS高程拟合精度的作业方法和建议.     

GPS RTK在输电线路测量中的应用

使用传统测量方法进行输电线路测量,劳动强度大,作业周期长,且精度难以保证。GPS RTK可以较好的解决这些问题。文中介绍了GPS RTK的原理和在输电线路测量中的应用方法;探讨了GPS RTK的高程精度;并提出了GPS RTK测量中应注意的问题。结果表明:GPS RTK测量可以满足输电线路测量的要求。     

网络RTK在数字化测图一级控制网布设中的应用

近几年来,GPS-RTK技术在数字化地形图测绘中已得到广泛应用。结合杭州富阳市1∶500数字化地形图测绘工程实例,探讨了在数字化地形图测绘中运用网络RTK进行一级控制网布设的方法、原理和可行性,并对测绘结果进行了精度分析。通过实验验证:用网络RTK施测的一级控制点方法的精度完全符合《浙江省GPS-RTK测量技术规定》的要求,此成果完全可以满足测区的1∶500数字化地形图测图需要。     

北斗RTK测量系统在矿山测量中的应用探讨

北斗卫星导航系统的发展为矿山测量提供了新的技术手段。利用理论分析和实测比较的方法,对北斗卫星导航系统应用于矿山测量进行了可行性分析和精度探讨。介绍了北斗卫星导航系统的发展及定位原理,通过实测数据分析得出了北斗RTK与GPS RTK的精度关系。得到结论:北斗RTK的精度已达到GPS RTK同等水平,北斗卫星导航系统在矿山测量中的应用不仅提高了矿区测量的效率、准确性,而且也有利于促进矿区的可持续发展。最后分析了北斗RTK在矿山测量实际应用中应注意的问题。     

GPS RTK技术的误差分析及质量控制

GPS RTK技术以其高效率在测绘领域发挥着重要作用,减少误差提高精度是GPS RTK技术运用的关键。分析GPS RTK技术在实际应用中各种误差来源和预防方法,阐述从环境、仪器、技术处理等方面减少误差来提高精度,加强质量控制,同时运用实例,与全站仪实测边、四等水准比较,验证了GPS RTK通过减少误差提高精度技术。     

GPS测量几个热点问题分析探讨

GPS测量目前正广泛应用于控制测量，BGPS中的RTK还用于图根控制，采点、放样等实时定位测量。GPS测量应用的热点问题有：基线及坐标分量精度分析、无约束网有没有粗差、约束网平差起算数据精度分析、大地高变向正常高转换等问题。     

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