BeiDou navigation satellite system(the BeiDou system) is the only PNT(Positioning, Navigation and Tim-ing) resource in China that has coverage of the globe and near-Earth space and provides continuous high-precision,l...BeiDou navigation satellite system(the BeiDou system) is the only PNT(Positioning, Navigation and Tim-ing) resource in China that has coverage of the globe and near-Earth space and provides continuous high-precision,low-cost positioning, navigation and timing solutions for users in a unified spatio-temporal benchmark. As an importantspatio-temporal benchmark transmission system, the BeiDou system is the most important resource for the nationalPNT system to provide a PNT capability under a unified spatial-temporal benchmark. This paper proposes the con-cept, composition and development model of the space-based PNT system design based on the BeiDou system withall its space characteristics, as well as the advantages of the system. It opens up a new direction for the construction ofChina's PNT system and expands a new horizon in the research of a PNT system in China.展开更多
Satellite navigation systems are vulnerable.To guarantee the positioning,navigation and timing(PNT)safety of core infrastructure,it is necessary to establish a secure PNT system with hybrid physical principles.In this...Satellite navigation systems are vulnerable.To guarantee the positioning,navigation and timing(PNT)safety of core infrastructure,it is necessary to establish a secure PNT system with hybrid physical principles.In this paper,the augmentations of the BeiDou satellite system(BDS)itself are analysed,namely augmentations through the BDS inter-satellite link,BDS geostationary orbit(GEO)and inclined geostationary orbit(IGSO)satellites,and BDS PNT services supported by low earth orbit(LEO)satellites.Then,taking BDS as the core component,the comprehensive PNT infrastructure seamlessly covering deep space and deep ocean is described,consisting of the deep space PNT constellation,the sea-floor PNT sonar beacon network,and the ground-based low frequency and very low frequency(VLF)long wave radio stations.Moreover,the key technologies of resilient PNT application matching comprehensive PNT and various autonomous perception PNT information are discussed,such as resilient PNT sensor integration,the resilient PNT functional model and the resilient stochastic model.As a future development direction,the key factors of intelligent PNT services are analysed,including the intelligent perception of PNT application scenes,the intelligent optimization of PNT functional and stochastic models and the intelligent fusion of multisource PNT information.展开更多
2024年3月,依据“未来导航”(FutureNAV)计划,欧洲航天局(ESA)与多家欧洲航天公司签署了总金额为2.33亿欧元的合同,用于开发“创世”(GENESIS)和“低地球轨道定位、导航与授时”(LEO-PNT)演示卫星,以增强卫星导航和新的地球测绘能力。其...2024年3月,依据“未来导航”(FutureNAV)计划,欧洲航天局(ESA)与多家欧洲航天公司签署了总金额为2.33亿欧元的合同,用于开发“创世”(GENESIS)和“低地球轨道定位、导航与授时”(LEO-PNT)演示卫星,以增强卫星导航和新的地球测绘能力。其中,GENESIS合同价值为7660万欧元,由不来梅轨道高科技系统公司意大利分公司(OHB Italia SpA)牵头,包括意大利、比利时、法国、瑞士、英国、匈牙利等国家的14个实体机构负责有效载荷及卫星的开发、制造、鉴定、校准、发射和卫星运营。展开更多
从导航增强与弹性定位、导航和授时(Positioning,Navigation and Timing,PNT)两个方向,系统阐述基于低轨星座的PNT性能提升能力,包括全球天基监测、全球准实时高精度、可信认证、弹性应急备份等。综合国内外低轨星座发展现状,分析了低...从导航增强与弹性定位、导航和授时(Positioning,Navigation and Timing,PNT)两个方向,系统阐述基于低轨星座的PNT性能提升能力,包括全球天基监测、全球准实时高精度、可信认证、弹性应急备份等。综合国内外低轨星座发展现状,分析了低轨星座实现PNT性能提升的两种实现途径:一是在导航频段播发信号实现性能提升,可与现有各全球卫星导航系统(Global Navigation Satellite System,GNSS)实现良好的兼容与互操作性能;二是利用通信频段播发导航通信(导通)融合信号,实现与现有导航频段信号的弹性应急备份。二者均可实现定位精度及其收敛时间、完好性、安全性等性能提升,但因信号频段和业务类型差异,两者的技术体制、实现能力和代价有所不同。为此,文章从星载接收与处理技术、导航增强和导通融合信号体制设计、同时同频收发干扰抑制技术、弹性终端融合接收处理技术等方面,分析了实现导航增强和弹性PNT服务的关键技术,最后给出了基于低轨星座的PNT性能提升的发展建议。文章的研究成果,有助于进一步探索低轨星座的潜力,促进全球卫星导航系统的发展,并为低轨PNT性能提升技术的研究和应用提供参考。展开更多
对美国定位、导航和授时(positioning,navigation and timing,PNT)领域的相关政策和整体目标进行了梳理,重点对GPS现代化改造、GPS与低轨通信卫星融合、建设eLoran系统和自主导航项目等重要PNT信息源的建设进展、服务能力和融合应用做...对美国定位、导航和授时(positioning,navigation and timing,PNT)领域的相关政策和整体目标进行了梳理,重点对GPS现代化改造、GPS与低轨通信卫星融合、建设eLoran系统和自主导航项目等重要PNT信息源的建设进展、服务能力和融合应用做了具体分析和总结,表明美国已经理清了PNT体系发展脉络,相关建设已进入实质阶段,同时对我国PNT信息源未来的发展、融合和建设提出了具体建议.展开更多
Any single Positioning,Navigation and Timing(PNT)technology has its vulnerability and limits,even the powerful Global Navigation Satellite System(GNSS)is no exception.To provide continuous and reliable PNT information...Any single Positioning,Navigation and Timing(PNT)technology has its vulnerability and limits,even the powerful Global Navigation Satellite System(GNSS)is no exception.To provide continuous and reliable PNT information to users,the theory and technique of comprehensive PNT information system and resilient PNT application system have attracted great attention from Chinese scholars.We try to summarize the progress and development of the synthetic PNT system,including the proposal,the modification and the improvement of the comprehensive PNT,as well as the follow-up resilient PNT.The frame of China’s comprehensive PNT system consisted of comprehensive PNT infrastructure and comprehensive PNT application system is initially described;the achievements on some main PNT technologies are introduced;the conceptual models of resilient PNT are given;besides,existing researches on resilient function models and stochastic models are summarized according to different user scenarios.展开更多
文摘BeiDou navigation satellite system(the BeiDou system) is the only PNT(Positioning, Navigation and Tim-ing) resource in China that has coverage of the globe and near-Earth space and provides continuous high-precision,low-cost positioning, navigation and timing solutions for users in a unified spatio-temporal benchmark. As an importantspatio-temporal benchmark transmission system, the BeiDou system is the most important resource for the nationalPNT system to provide a PNT capability under a unified spatial-temporal benchmark. This paper proposes the con-cept, composition and development model of the space-based PNT system design based on the BeiDou system withall its space characteristics, as well as the advantages of the system. It opens up a new direction for the construction ofChina's PNT system and expands a new horizon in the research of a PNT system in China.
基金supported by the Key Program of National Natural Science Foundation of China(Grant No.41931076)the Laoshan Laboratory(Grant No.LSKJ202205101)+1 种基金the National Natural Science Foundation of China for Young Scholar(Grant No.41904042)the National Key Research and Development Program of China(Grant No.2020YFB0505800)。
文摘Satellite navigation systems are vulnerable.To guarantee the positioning,navigation and timing(PNT)safety of core infrastructure,it is necessary to establish a secure PNT system with hybrid physical principles.In this paper,the augmentations of the BeiDou satellite system(BDS)itself are analysed,namely augmentations through the BDS inter-satellite link,BDS geostationary orbit(GEO)and inclined geostationary orbit(IGSO)satellites,and BDS PNT services supported by low earth orbit(LEO)satellites.Then,taking BDS as the core component,the comprehensive PNT infrastructure seamlessly covering deep space and deep ocean is described,consisting of the deep space PNT constellation,the sea-floor PNT sonar beacon network,and the ground-based low frequency and very low frequency(VLF)long wave radio stations.Moreover,the key technologies of resilient PNT application matching comprehensive PNT and various autonomous perception PNT information are discussed,such as resilient PNT sensor integration,the resilient PNT functional model and the resilient stochastic model.As a future development direction,the key factors of intelligent PNT services are analysed,including the intelligent perception of PNT application scenes,the intelligent optimization of PNT functional and stochastic models and the intelligent fusion of multisource PNT information.
文摘2024年3月,依据“未来导航”(FutureNAV)计划,欧洲航天局(ESA)与多家欧洲航天公司签署了总金额为2.33亿欧元的合同,用于开发“创世”(GENESIS)和“低地球轨道定位、导航与授时”(LEO-PNT)演示卫星,以增强卫星导航和新的地球测绘能力。其中,GENESIS合同价值为7660万欧元,由不来梅轨道高科技系统公司意大利分公司(OHB Italia SpA)牵头,包括意大利、比利时、法国、瑞士、英国、匈牙利等国家的14个实体机构负责有效载荷及卫星的开发、制造、鉴定、校准、发射和卫星运营。
文摘对美国定位、导航和授时(positioning,navigation and timing,PNT)领域的相关政策和整体目标进行了梳理,重点对GPS现代化改造、GPS与低轨通信卫星融合、建设eLoran系统和自主导航项目等重要PNT信息源的建设进展、服务能力和融合应用做了具体分析和总结,表明美国已经理清了PNT体系发展脉络,相关建设已进入实质阶段,同时对我国PNT信息源未来的发展、融合和建设提出了具体建议.
基金Key Program of National Natural Science Foundation of China(No.41931076)Laoshan Laboratory(No.LSKJ202205101)+1 种基金National Key R&D Program of China(No.2020YFB0505800)National Natural Science Foundation of China for Young Scholar(No.41904042)。
文摘Any single Positioning,Navigation and Timing(PNT)technology has its vulnerability and limits,even the powerful Global Navigation Satellite System(GNSS)is no exception.To provide continuous and reliable PNT information to users,the theory and technique of comprehensive PNT information system and resilient PNT application system have attracted great attention from Chinese scholars.We try to summarize the progress and development of the synthetic PNT system,including the proposal,the modification and the improvement of the comprehensive PNT,as well as the follow-up resilient PNT.The frame of China’s comprehensive PNT system consisted of comprehensive PNT infrastructure and comprehensive PNT application system is initially described;the achievements on some main PNT technologies are introduced;the conceptual models of resilient PNT are given;besides,existing researches on resilient function models and stochastic models are summarized according to different user scenarios.
