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
为了应对未来复杂战场环境中对定位、导航和授时(Positioning,Navigation and Timing,PNT)的需求,构建更加可靠的PNT能力,我国正在大力推进建设以第三代北斗全球卫星导航系统为核心的国家综合PNT体系,其中水下PNT体系是其重要组成部分...为了应对未来复杂战场环境中对定位、导航和授时(Positioning,Navigation and Timing,PNT)的需求,构建更加可靠的PNT能力,我国正在大力推进建设以第三代北斗全球卫星导航系统为核心的国家综合PNT体系,其中水下PNT体系是其重要组成部分。由于水下无法接收到卫星信号,这就要求尽可能地使用更高精度的惯性导航系统(Inertial Navigation System,INS),而原子陀螺具有极高的理论精度,为构建极高精度的INS提供了可能。从水下PNT体系建设需求出发,综述了原子陀螺技术的结构和基本原理,介绍了其国内外发展历程、研究现状、存在的问题和应用程度,并分析了原子陀螺在水下PNT体系建设中的重要作用和应用前景。展开更多
As one of the four global satellite navigation systems,Compass not only enhances satellite visibility and availability for positioning,navigation and timing (PNT) for users in China and the surrounding areas,but also ...As one of the four global satellite navigation systems,Compass not only enhances satellite visibility and availability for positioning,navigation and timing (PNT) for users in China and the surrounding areas,but also improves PNT precision for global users.The improvements in satellite visibility and the dilution of precision are analyzed under GNSS compatibility and interoperation conditions.The contribution of the Compass satellite navigation system to global users,especially the benefits that users can acquire from the combination of Compass,GPS,GLONASS,and Galileo navigation systems,is analyzed using simulation data.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
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.
文摘为了应对未来复杂战场环境中对定位、导航和授时(Positioning,Navigation and Timing,PNT)的需求,构建更加可靠的PNT能力,我国正在大力推进建设以第三代北斗全球卫星导航系统为核心的国家综合PNT体系,其中水下PNT体系是其重要组成部分。由于水下无法接收到卫星信号,这就要求尽可能地使用更高精度的惯性导航系统(Inertial Navigation System,INS),而原子陀螺具有极高的理论精度,为构建极高精度的INS提供了可能。从水下PNT体系建设需求出发,综述了原子陀螺技术的结构和基本原理,介绍了其国内外发展历程、研究现状、存在的问题和应用程度,并分析了原子陀螺在水下PNT体系建设中的重要作用和应用前景。
基金supported by the National Natural Science Foundation of China (41020144004 and 40841021)the National High-Tech Research & Development Program of China (2007AA12Z331)
文摘As one of the four global satellite navigation systems,Compass not only enhances satellite visibility and availability for positioning,navigation and timing (PNT) for users in China and the surrounding areas,but also improves PNT precision for global users.The improvements in satellite visibility and the dilution of precision are analyzed under GNSS compatibility and interoperation conditions.The contribution of the Compass satellite navigation system to global users,especially the benefits that users can acquire from the combination of Compass,GPS,GLONASS,and Galileo navigation systems,is analyzed using simulation data.
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.
