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1、受限条件下的全球卫星导航精度性能评估李作虎1郝金明1李建文1,2赵齐乐2李国重3,1(1.信息工程大学测绘学院,河南郑州,450052;2.武汉大学卫星导航定位技术研究中心,湖北武汉,430079;3.信息工程大学理学院,河南郑州,450001;)摘要:卫星导航系统在诸多不同领域内的广泛应用使得其在不同应用环境条件下服务性能的适应性逐渐成为民用用户普遍关心的问题之一,同时也是美军及其盟军在阿富汗和伊拉克战场上亟需解决的问题之一。在对卫星导航系统精度性能评估模型进行简要分析的基础上,根据可视卫星的方位角分布密度提出了几种典型的可视空间受限应用条件,以GPS目前
2、的星座为例,对中纬度观测点在几种受限条件下的定位精度及其可用性进行了定量计算和比较,结果表明,同样的遮挡物在相同的条件下位于不同的方位角区间内对于定位精度及其可用性的影响程度差异很大。实验结论既可用来指导在受限条件下的GPS导航定位作业,亦可为卫星导航系统的设计和管理提供参考依据。关键词:全球卫星导航系统;用户等效测距误差;精度衰减因子;性能评估;PrecisionassessmentofGlobalNavigationSatelliteSystemsinlimitedconditionsLiZuohu1HaoJinming1LiJianwen1,2Zhao
3、Qile2LiGuozhong3,1(1.InstituteofSurveyingandMapping,InformationEngineeringUniversity,HenanZhengzhou,450052,China;2.NavigationandPositioningTechnologyResearchCenter,WuhanUniversity,HubeiWuhan,430079,China;3.InstituteofSurveyingandMapping,InformationEngineeringUniversity,HenanZhengzh
4、ou,450001,China)Abstract:Becauseofthewidelyapplicationofsatellitenavigationsystemsinsomanydifferentfields,theapplicabilityofserviceperformanceindifferentappliedenvironmentsandconditionshasbecomeoneofthegenerallyconcernedmatterswithcivilusers,aswellasoneofthevitalproblemsmetbyU.S.ar
5、myanditsalliedforcesinbattlefieldsofAfghanistanandIraq.Basedonthesummarydiscussionabouttheprecisionassessmentmodelofsatellitenavigationsystems,severalkindsoflimitedconditionsofvisiblespacearegivenaccordingtothedensitydistributionofazimuthanglesofvisiblesatellites.ThentakingtheGPSfo
6、rinstance,thepositioningaccuracyanditsavailabilityintheaboveseverallimitedconditionsatmedianlatitudeobservationlocationsarecomputedandcomparedquantificationally.Andresultsshowthatthesameobstructorslocatedindifferentazimuthdistributionareasinthesameconditionshavesignificantlydiffere
7、ntimpactsonthepositioningaccuracyanditsavailability.AndthisconclusioncanbeusednotonlyasguidanceforGPSpositioningandnavigationtaskinlimitedconditions,butalsoasargumentforthedesignandarrangementofsatellitenavigationsystems.Keywords:globalnavigationsatellitesystem;UERE;DOP;performance
8、assessment;1引言收稿日期:xxxx-xx