CORS网型结构对网络PTK服务性能的影响研究
Impacts of CORS Network Structure for Real-Time Differential Positioning Service Performance
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摘要: 网型单元是CORS网络RTK的基本服务单元,定量评价网内各单元的服务能力对于指导和优化CORS网络建设有着积极作用。本文提出了一种基于主参考站服务能力的网型结构评价因子,结合美国CRTN网5个测站年积日2010.93的数据,分析了网型单元中不同主参考站对网络改正数精度的影响;并针对川渝CORS网络25万km2服务范围、82个三角服务单元,分析了网型结构与区域实时差分定位服务性能的关系。结果表明,CORS站网型结构是影响网络RTK定位服务性能的主要因素之一;本文提出的网型结构因子可用于100km级参考站网络网型结构的评价指标。Abstract: ThestructuralunitisthebasiccellforCORSnetworkRTKservice.EvaluatingtheserviceperformanceofeachunitquantitativelyhasapositiveeffectwhenguidingandoptimizingtheCORSnetwork.Inthispaper,thepriorivariancedistributionofatmosphericcorrectionsisanalyzedwithalinearinterpolationmodel(LIM).Anevaluationfactorforthenetworkstructureisalsoproposedbasedonserviceperformanceofthestructuralunit.FivestationsfromCRTNnetinU.S.(DOY2010.93)aretestedtounderstandthedifferentperformanceswithdifferentstationsusedasthemasterreferencestation.Finally,therelationshipbetweennetworkstructureandserviceperformanceisana lyzedintheSichuan ChongqingCORS(ithas82triangleserviceunits,withaserviceareacovering250,000squarekilometers).ExperimentalresultsshowthattheCORSnetworkstructureisoneofthemainfactorsthataffecttheserviceperformanceofwide areareal timedifferentialpositioning.TheproposednetworkstructurefactorcanbeusedforevaluatingthestructureofaCORSnetworkwith100kmlevelbaselinelength.
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