共查询到18条相似文献,搜索用时 171 毫秒
1.
姜宁章川扬之亢晨宇孙耀华闫实彭木根 《无线电通信技术》2023,(5):842-852
低轨(Low Earth Orbit,LEO)卫星网络凭借其在发射成本、广域覆盖和高抗毁性等方面的优势,已成为下一代全球移动通信系统发展的焦点。为了进一步支撑未来空天地组网通信、协作遥感、星上计算等多维功能的协同演进,低轨卫星网络需要将通信、感知与计算功能进行融合,获取性能协同增益。然而,传统低轨卫星网络中通感算三者长期隔立分治,需要在架构、网元功能协议、关键技术等方面进行重新设计与突破。基于此,介绍了基于通信感知计算融合的低轨卫星研究意义和相关研究基础;提出了融合组网架构构想和网元与协议体系,并详细阐释了架构的组成和工作方法;同时,对星间链路组网、协作计算、感知融合和动态接入等关键技术进行了分析;对融合架构和理论、信息在轨融合方法、卫星算力网络和动态资源分配等未来挑战和发展方向进行了探讨。 相似文献
2.
3.
4.
文章简单回顾窄带卫星网络,介绍利用宽带卫星链路接入因特网的特点和好处,讨论卫星与陆地网络的互联、卫星链路上的TCP/IP协议和卫星网络的移动管理等关键技术问题。 相似文献
5.
6.
7.
AFF组网通信与测距/时间同步的新体制研究 总被引:2,自引:0,他引:2
研究了自主编队航天器(AFF,autonomous formation flyer)的组网通信与测距/时间同步体制,提出了一种基于频分 码分组合多址模式和CCSDS proximity-1协议实现AFF组网通信,利用通信链路的双向异步传输帧实现AFT的任意两颗成员星之间的精密测距与时间同步的新方法.重点讨论了FDMA/CDMA组网体制下星间双向异步传输帧非相干扩频测距与时间同步的技术原理、计算公式推导和测量误差分析,给出了星间异步通信与测距技术的全功能地面实验系统设计、实验结果及其分析讨论,实测结果获得了满意的性能指标. 相似文献
8.
9.
10.
11.
The next generation of broadband satellite networks is challenged to accommodate multimedia services while concurrently integrating with terrestrial IP networks. With IP applications dominating the Internet, carrying IP traffic over the satellite has been under intensive study. Originally developed to bring digital television home through satellites, the DVB-S and DVB-RCS standards empower interactive satellite communications with economical standardized satellite terminals. Furthermore, onboard switching technology is increasingly gaining attention, due to optimized bandwidth usage, fully meshed network topology through one satellite hop, and quality of service guarantee. This article investigates the onboard switching technologies in DVB-S/DVB-RCS broadband satellite networks. Aside from the network system infrastructure and switch hardware architecture, the QoS mechanisms supported by the switch onboard the satellite are discussed in depth. 相似文献
12.
Effects on TCP of routing strategies in satellite constellations 总被引:3,自引:0,他引:3
A broadband satellite network uses a constellation of a number of similar satellites to provide wireless networking services to the Earth. A number of these constellation networks are under development. This article introduces the types of satellite constellation networks, and examines how overall performance of TCP communications carried across such a network can be affected by the choice of routing strategies used within the network. Constellations utilizing direct intersatellite links are capable of using multiple paths between satellites simultaneously as a strategy to spread network load. This allows more general routing strategies than shortest-path routing, but we show these strategies to be detrimental to the performance of individual TCP connections 相似文献
13.
Jamalipour A. 《Proceedings of the IEEE. Institute of Electrical and Electronics Engineers》2001,89(1):88-104
Next-generation broadband satellite networks are being developed to carry bursty Internet and multimedia traffic in addition to the traditional circuit-switched traffic (mainly voice) on a global basis. These satellites provide direct network access for personal applications as well as interconnectivity to the terrestrial remote network segments. The main requirement in success of these networks is that they should be able to transmit high data rate traffic with prescribed quality of service (QoS). Thus, the broadband satellite network has no choice other than the rise of ATM technology and to be optimized for Internet-based traffic. ATM is the promising technology for supporting high-speed data transfer potentially suitable for all varieties of private and public telecommunications networks. IP, on the other hand is the fast-growing Internet layer protocol that is applicable over any data link layer Internet-based applications are the emerging source of traffic in the future wireless networks and broadband satellite networks should consider Internet as the primary service. In this paper, we discuss the traditional ATM and wireless ATM networks and explain the characteristics of the wireless IP networks. The paper then uses those concepts in defining the criteria for the broadband satellite networks such as the QoS and traffic management. Application of the broadband satellite networks is also proposed 相似文献
14.
Extending Global IP Connectivity for Ad Hoc Networks 总被引:1,自引:0,他引:1
Ad hoc networks have thus far been regarded as stand-alone networks without assumed connectivity to wired IP networks and the Internet. With wireless broadband communications and portable devices with appropriate CPU, memory and battery performance, ad hoc connectivity will become more feasible and demand for global connectivity through ad hoc networking is likely to rapidly grow. In this paper we propose an algorithm and describe a developed prototype for connectivity between an ad hoc network running the ad hoc on-demand distance-vector protocol and a wired IP network where mobile IP is used for mobility management. Implementation issues and performance metrics are also discussed. 相似文献
15.
利用宽带卫星链路接入互联网是今后卫星通信的重要发展方向。首先介绍了基于宽带地球同步轨道(GEO,Geostationary Earth Orbit)网络移动的概念并以IPSTAR卫星为例建立模型,重点分析了基于宽带卫星移动通信的网络移动中的传输控制协议(TCP,Transfer Control Protocol)的特点,对TCP协议性能进行仿真模拟,最后分析了TCP协议在网络移动通信中的性能。结果证明,在宽带多媒体卫星移动通信中,由于系统允许信息传输具有较大带宽(IPSTAR中可以达到2 Mb/s),TCP传输的吞吐量和时延表现的较为稳定,因此,在基于宽带多媒体卫星的网络移动通信中实现TCP数据的传输具有一定的可行性。 相似文献
16.
17.
18.
卫星通信的技术发展及应用 总被引:5,自引:0,他引:5
简要回顾了卫星通信的发展历程,介绍了一些正在发展的技术,并对卫星通信在未来中的主要应用进行了阐述。卫星通信的重要技术发展包括基于数字视频广播(DVB)的标准的建立、星载开关(On-Board Switching)的应用。其他的技术包括多协议标记交换(MPLS)在卫星网络上的应用及卫星间和平台间光学连接的应用。 相似文献