卫星网络方面的研究每日记录

1、下行两点与贾导讨论：1. AdHoc在卫星网络方面的应用可以从三个方面着手研究a. 卫星的网络拓扑结构变化；b. 卫星之间通信的时延；c. 卫星传输数据或者路由时的带宽。2. 找Ad Hoc和MANET综述性的文章。3. 搞清楚现有的技术，然后再结合卫星运行相关的特征进行对比。晚上贾导发了五篇文章：提出两点建议：1. first read ADV, DSR routing, then the survey of Manet routing.2. the topic of your first paper could be:time-dependent routing protocol for

2、fast topology changing self-organized satellite networkbasically, each node needs to remember the topology at any time point. so, for sending a message at a particular time, it needs to use the route at that very time point!晚上听汤森路透的马亚鹏讲web of science和Oneline EndNotes1. web of science 只是检索二次文献的工具：即许多

3、都不提供全文，只提供摘要、参考文献和出版商。2. 只看来看SCI的论文：Web of Science Core Collection: Web of Science核心核集。3. 看一篇论文除了找被引文献和参考文献，还应该关注相关文献（即某参考文献被别的文章也引用），如果该参考文献被更多的文章所引用，可能该参考文献中有很重要的奠基性的工作，在写论文的时候要包含进去，否则有可能被退稿。4. 分析检索结果，可以找到潜在的合作者和机构。5. 引文报告里的高热点（即平均被引用次数高的文献）需要关注。6. OA(Open Access)表明是可以开放索取到的文献，即提供全文，在左侧精炼选项里面可以查得。

4、7. 一个检索的例子(abc or def ) and (123* or accelerat*) and ''cross，其中''表示连接的两个词间不能插入别的词8. 如果想投稿某期刊，需要关注该期的发行周期，有一些年刊，要避免。9. annualreview美国的一个年评，有近四十本期刊，每篇文章都是一篇综述，深圳大学城图书馆已经订购。2014年10月16日常用词汇：state of the art 最新水平，科技进步水平e.g. These cars are all built with state of the art enginesnetwork con

5、gestion 网络拥塞delivery ratio 投递率2014年10月17日Some concepts to understand(using one's own language)：网关（gateway）:Transformational Satellite Communications System (TSAT) Network: 检索IEEE时一些大学的缩写：peking university or peking univ tsinghua university or tsing hua univharbin institute of technology or harbi

6、n inst of technol常用词汇：1). delay tolerant 延迟容忍2). heterogeneous英hetr'di:ns美htrdinis, -dinjsadj.各种各样的;成分混杂的例句Quantifying fungal growth dynamics in heterogeneous soil environments.3). throughput英ru:pt美ruptn.生产量，生产能力，吞吐量;流率例句Amazon dynamodb provides high throughput at very low latency.amazondynamodb

7、能够以非常低的延迟来提供高吞吐量。4). line of sightn.（名词）【复数】 lines of sight缩写 LOSAn imaginary line from the eye to a perceived object.视线：从眼到被观察物之间的想象的线An unobstructed path between sending and receiving antennas.瞄准线：能够直接从发射点到接受点的线5). omni-directional网络全向；全向性；全指向性6). backhaul英bæk'h:l美bæk'h:ln.（货运车的）

8、回程（通常亦载货），回程运费;回运例句Backhaul traffic : goods carried on a return journey.回运：货物的回程运输。7). load distribution英lud distribju:n美lod dstrbjun负荷分配例句Finally , according to experiment data , we calculate the lubricating system main nodes temperature and thermal load distribution of high state.最后根据相关试验数据推算出高空状态

9、时滑油系统热负荷分配及各节点温度情况。8). large round-trip-times(RTT)大的往返时间。9). en route英en ru:t美n rutadv.在途中例句She alleged she had been beaten en route.她宣称自己在路上被打了。10). aging and antiquated systems老化和陈旧的系统11). maneuverability  m'nuvr'bltn.  可操作性; 机动性12). locus n. 场所轨迹所在地13). dead-reckoning英'dedr&

10、#39;ekn美'dedr'ekn航位推算法例句Interpolation between satellite positions was initially carried out by dead-reckoning procedures.卫星定位值间的内插最初用的是推算航行法。14). close proximity links靠得很近的连接15). side-effect副作用协议：1. OLSR是Optimized Link State Routing 的简称，主要用于MANET网络(Mobile Ad hoc network)的路由协议。OLSR是根据MANET的要求

11、，在传统的LS（Link state）协议的基础上优化的。OLSR中的关键概念是多点转播（MPRs），MPRs是在广播洪泛的过程中挑选的转发广播的节点。传统的链路状态协议每个节点都转发它收到信息的第一份拷贝，同它相比，OLSR很大程度上减少了转发的信息。在OLSR协议中，链路状态信息都是由被挑选为MPRs的节点产生的，这样减少了在网络中洪泛的控制信息，实现了第二步优化。第三步优化是MPR节点只选择在MPR或者MPR选择者之间传递链接状态信息。因此，同传统LS协议相比，在网络中分布着部分链路状态信息，这些信息将用于路由计算。OLSR以路由跳数提供最优路径。这种协议尤其适合大而密集型的网络。2.

12、今天所查的论文：J. Zhang, Q. Chen, S. Lan and Z. Yan, Ad-Hoc-Based Inter-Communication Network System for Fractionated Spacecraft , 7th International Workshop on Satellite Constellations and Formation Flying, Lisbon, Portugal, 13-15 March, 2013 Advanced communications networking concepts for the National Ai

13、rspace System. Aerospace Conference, 2005 IEEE .此文讲了MANET可能用在航天上，可以重点看一下。related system include : terrestrial line-of-sight (LOS) systems, satellite communications (SATCOM) beyond LOS (BLOS) systems.Mobile routing architectures in the transformational communication era.这篇文章讲了MANET协议不能用在大尺度的和大规模的传输通信

14、体系上，并提出了一个潜在的IPV6地址和路由协议。Gateway Placement in Hybrid MANET-Satellite Networks. Re-using the mechanisms of clustering techniques intially designed to solve scalability issues in MANETs to address satellites topology changes quickly.Analyzing and simulation on MANET system on satellite communication c

15、onstellation.Microwave and Millimeter Wave Technology, 2008. ICMMT 2008.Using OPNET to modeling satellite communication constellation based on MANET, and then analyzing the delay and throughout, they conclude the advantage and disadvantage of the model.A cluster-based load balancing between satellit

16、e gateways in a MANET. This paper presents a load balancing mechanism which distributes traffics among different satellite gateways of a mobile ad-hoc network. The principle is based on the OLSR routing protocol and relies on the corespondence between satellite gateway load and the size of the clust

17、er served by this gateway.An End-to-End Transport Protocol for Extreme Wireless Network Environments. Military Communications Conference, 2006. MILCOM 2006. IEEE. This pater mentioned the large round-trip-times(RTT) in satellite networks and give a algrithom LT-TCP, an enhancement to TCP which makes

18、 it robust and applicable for extreme wireless environments including a mix of ad-hoc meshed networks, airborne networks and satellite networks. They show that LT-TCP substantially improves performance over regular TCP even for packet loss rates of up to 40%-50%, thus substantially extending the dyn

19、amic performance range of TCP over lossy wireless networks.Positioning range extension gateways in mobile ad hoc wireless networks to improve connectivity and throughput. Military Communications Conference, 2001. MILCOM 2001. This paper provide methods to copmutes the optimal position of the gateway

20、 which has a dynamic trajectory.分布式集群空间飞行器综述。阐述了“分布式集群空间飞行器”系统概念,分析了系统的数据类型与基本功能,讨论了自主飞行控制、无线自组织网络、无线激光通信和模块化、小型化等关键技术,可为实现模块化航天器系统提供借鉴。 Jinxiu Zhang 哈工大卫星所IEEE802.11optimizationtechniques相关Wireless Communication in LEO Satellite Formations. Adaptive Hardware and Systems, 2008.Optimisation approache

21、s such as the tuning of the IEEE 802.11 physical layer parameters and enhancing the data link layer for space applications are described. The integration of smart antennas with the MAC protocol is also considered aiming at increasing the capacity and throughput while minimizing interference and coll

22、ision in close proximity links.Results of a Requirements Study for Mobile Ad-hoc Networks of Small Satellites. 可以发邮件到此索取这篇文章。 International Astronautical Federation, 2011. 这篇文章讲到了MANET用在Small Satllites 的问题和需求。Routing algrithom: 还要需要总结MANET方面的路由算法。晚上七点开始看计算理论导引已经看到29页。2014年

23、10月17日常用述语：1. contention window竞争窗口2. slot time 3. inter satellite link英nt: sætlait lik美nt: sætlat lk星际链路4. performance metrics 性能标准He introduced merit pay for public workers and performance metrics for state agencies. 他引入了公务员绩效工资，以及州政府机构的表现衡量标准。We typically don't share performance met

24、rics for individual search properties. 我们通常不会为个人搜索属性分享性能标准。5. traffic source 信源6. overhead traffic 开销通信量 Examples show that the calculating architecture can reduce overhead traffic,and keep a favorable expansibility.      实例分析表明该计算框架能够减少节点间的通信开销,保持了良好的可扩展性;802.11协议帧间间隔-SIFS,DIFS,

25、PIFS,EIFS 及 slottime 转自SIFS, Short Interframe Space(SIFS): 在802.11系列无线局域网中SIFS是固定值，SIFS是最小的帧间间隔，因此采用SIFS的节点具有访问无线链路的最高优先级。它等于节点从发送状 态切换到接收状态并能正确解码所需要的时间，或者从接收状态转为发送状态所需要的时间，在SIFS过期后可能发送的数据包包括ACK、CTS帧，不同标准 中规定的SIFS值不同。StandardSIFS(s)IEEE 802.11b10IEEE 802.11a16IEEE 802.11g10DIFS, DCF Interf

26、rame Space(DIFS):在DCF协议中，节点在开始发送数据之前需要监测信道是否空闲。如果信道已经空闲，则节点仍需等待DIFS段时间才开始发送数据；而如果在DIFS时间段内任一时刻信道被监测为忙，则节点不得不推迟它的数据发送。DIFS和SIFS间的计算关系如下：DIFS = SIFS + (2 * Slot time)StandardSlot Time(µs)DIFS(µs)IEEE 802.11b2050IEEE 802.11a934IEEE 802.11g9 or 2028 or 50PIFS, PCF Interframe Space(PIFS):P

27、CF使得AP等待PIFS而不是DIFS时间以访问信道，由于DIFS > PIFS > SIFS，因此AP总比普通节点具有更高的访问信道的优先级。PIFS = SIFS + Slot timeStandardSlot time(µs)PIFS(µs)IEEE 802.11b2030IEEE 802.11a925IEEE 802.11g9 or 2019 or 30EIFS, Extended Interframe Space(EIFS):在前一帧出错的情况下，发送节点不得不延迟EIFS而不是DIFS时间段后再发送下一帧。EIFS = Transmissi

28、on time of Ack frame at lowest basic rate + SIFS + DIFSPerformance Evaluation of Ad Hoc On Demand Distance Vector in MANETs with varying Network Size using NS-2 Simulation此文感觉灌水的成份比较大，提及在一个平面范围内建五十个结点给定速度，报文，利用NS-2计算分组收包率、吞吐量等网络性能指标。Performance Comparison of MANETs Routing Protocols for Dense and Sp

29、arse Topology 2014年10月18日1. scalability英skel'blt美skel'bltn.可量测性; 2. interoperable interoperable英ntrprbladj.能共同操作的，能共同使用的例句Look no further than the internet for the inspiration for interoperable innovation.要寻找可互操作创新的灵感，只需以互联网为例。3. routing overhead 路由开销4. round trip time 往返时间5. hierarchic

30、al英ha'r:kkl美harrkkl, harr-adj.按等级划分的，等级（制度）的;分层的例句The importance of angels to the divine enterprise makes them naturally hierarchical.天使在神的属地里的重要性自然地使他们具有等级。6. handover 移交, 交接论文：Analysis of Wireless Networks for Satellite Swarm MissionsTelematic Applications, Volume # 3 | Part# 1Location: Yonsei

31、 University, Seoul, Korea, SouthNational Organizing Committee Chair: Schilling, Klaus, Kim, Seong-LyunInternational Program Committee Chair: Kim, Euntai, Nenninger, PhilippConference Editor: Lee, Jang-Won这篇文章没有下到，不过网页上提供了摘要和参考文献This paper analyses different communication and energy issues for an imp

32、lementation of a swarm mission in space.该文章有意义的参考文献：P.M. Khilar A. Mahapatro. Mobility and energy aware distributedclustering protocol for ad hoc sensor networks.Annual IEEE India Conference (INDICON), pages 17,2011.W Ivancic, W.M Eddy, D Stewart, L Wood, J Northam,and C Jackson. Experience with del

33、ay-tolerant networkingfrom orbit. International Journal of Satellite Communicationsand Networking, 28(5-6):335351, 2010.M. Schmidt F. Zeiger M. Sauer M. Drentschew,M. Marszalek and K. Schilling. Results of a requirementsstudy for mobile ad-hoc networks of small satellites.62nd International Astronau

34、tical Congress, 2011.K. Schilling. Networked distributed pico-satellite systemsfor earth observation and telecommunication applications.In Plenary Paper in Proceedings of IFAC WorkshopAerospace Guidance,Navigation and Flight Control,Samara, Russia, IFAC, 2009.L Wood. Assessing and improving an appro

35、ach to delaytolerantnetworking. First Annual CCSR Research Symposium(CRS 2011), Centre for Communication SystemsResearch, Peer-reviewed conference paper, 2011.Implementation and analysis of networking protocols for low earth orbit satellite formation network. 此文讲解了LEO轨道的两个编队飞行的卫星（一个花星系，一个圆型星系），并用STK

36、软件呈现出来，并提级了两个编队群中卫星的最大距离和最小距离，为时延的计算做了准备，最后针对卫星之间的通信，修改了802.11通信时间间隔。2014年10月19日TTL生存时间(time-to-live)指定数据包被路由器丢弃之前允许通过的网段数量。它是IP（中文全称：网络协议）协议包中的一个值，它告诉网络，数据包在网络中的时间是否太长而应被丢弃。TTL设置为0，则该包将被立即丢弃。微小卫星组网或编队的背景介绍：1. 微小卫星（10-100Kg）微小卫星自身具有体积小、质量轻、开发周期短、代价低、抗摧毁能力强等优点。就单颗微小卫星来说，由于受到体积、质量、功耗等因素的限制，其身身的功能很弱，而随

37、着卫星组网编队技术的发展，几十甚至上百颗小卫星组成一个编队网络，网络中的每个小卫星平均分担大卫星的任务，这些小卫星之间共同合作来实现此任务，实现一颗大卫星的功能，这开拓了卫星研究领域的新天地。2. 低轨道（LEO轨道）地球静止轨道（35786km），资源有限，而且传输距离远，导致传输时延较长；地球静止轨道只有一条链路，所以信道资源有限；需要较大口径天线来弥补信号强度与传输距离成反比的问题。3. 多种编队方案小卫星编队网络根据不同的编队方案，可以实现全球无缝隙覆盖。哈工程的徐海峰的空间皮卫星编队组网拓扑及其相关技术研究中介绍了Flower星座设计主星与从星之间的最大最小距离及平均距离。F6计划：

38、把一个航天器的任务载荷、动力、通信、导航、计算处理等功能单元优化分解为多个模块，每个模块从本质上说是一颗完整的卫星，只是在物理上相互独立，卫星间通过无线链路交换定位或者控制信息，功能协同，资源共享。查找论文：1. Research on Reconfigurable distributed computing architecture of pico-satellite nodes.2. Satellite formation flying using along-track thrustJ. ScienceDirect 2007: 553-564. 书籍张育林等. 卫星星座理论与设计.杨颖,

39、 王琦. STK在计算机仿真中的应用2014年10月22日这几天了解时延算法和卫星之间距离与时间的关系另外准备博士科技英语的PPT，并为上台演讲做准备。2014年10月23日今天找到了几篇很好的文章清华大学在软件学报上的卫星路由技术综述性的文章卫星网络路由技术 2014年5月出版清华大学的龙飞在2010年的博士论文卫星网络鲁棒QoS路由技术研究看论文DTN(Delay Tolerent networks)的第一篇论文 accommodating Transient Connectivity in Ad Hoc and Mobile Settings.总结一下，并将自己的方法向上面应用。2014

40、年11月8日severe contention严重的争议to date 迄今为止goodput实际吞吐量2015年3月17日利用STK如何建立walker星座？在建立walker星座前必须选建立一个seed节点，这个seed卫星决定了卫星的轨道倾角和高度，还有升交点等信息。任意一颗卫星和其余卫星的接解时间表，还不会建立，不能区分出任意的该颗卫星和别的卫星的时间间隔。2015年3月18日刘文强: 卫星时变网络和DTN网络之间的区别与联系？卫星网络拓扑定义：来看卫星网络拓扑动态性及仿真系统研究walker星座倾角45度，高度700km，3个轨道面，每个轨道面6颗卫星的情况。2015年3月19日今天

41、开例会，把自己的乱七八糟的想法给说了一下，然后就被打断了，还是应该专注在一件事上，先把这种事情解决了然后再去解决别的事情。乱七八糟的想法包括：1. three greedy algorithms for the minimum transmission broadcast.2. how to model the predicable satellite or other networks3. when user has a sequence date to transmit, how can we guarantee the right order of the message which r

42、eceived by the receiver. Maybe we can use the algorithm Dr. Du mentioned in the distributed systems class.walker 700km 3个轨道面，每个轨道面8颗卫星的情况时延有两种，一种是星间链路的传播时延，另一种是所有信息从某个卫星传输出去的到达目的卫星的时延。现在有限定两个小时内将数据传输到整个网络，我有这组数据了，数据可以通过STK生成的report然后导入到excel中进行处理。2015年3月24日星期二LaTeX/Algorithms 伪代码这段时间在上算法课，有些作业题目要求写出

43、伪代码。正好这段时间在学习latex，于是就收集整理了下latex描写算法的包。latex下描写算法的包主要有algorithmic, algorithmicx和algorithm2ealgorithmic和algorithmicx介绍下algorithmic和algorithmicx，这两个包很像，很多命令都是一样的，只是algorithmic的命令都是大写，algorithmicx的命令都是首字母大写，其他小写(EndFor两个大写)。下面是algorithmic的基本命令STATE <text>IF<condition>STATE<text>

44、ENDIFFOR<condition>STATE<text>ENDFORFOR<condition> TO <condition> STATE<text>ENDFORFORALL<condition>STATE<text>ENDFORWHILE<condition>STATE<text>ENDWHILEREPEATSTATE<text>UNTIL<condition>LOOPSTATE<text>ENDLOOPREQUIRE <text>E

45、NSURE <text>RETURN <text>PRINT <text>COMMENT<text>AND, OR, XOR, NOT, TO, TRUE, FALSEConsider an example satellite network of seven nodes A, B, C, D, E, F, G as shown in Figure 1. Each sub-figure is a snapshot of the network during a time interval. A link is established betwee

46、n two satellites when they enter each other's communication range. Note that in this satellite network, the graph is not connected at any point in time. However, the graph is connected over time by paths, where messages are carried for a certain duration on their way towards the destinations. Co

47、nsider broadcasting a message from a source A starting at time t1 to the other satellites. The message can take an option P1: A to B in time interval t1-t2, B to (D, F), A to C int2-t3, F to G in t3-t4, D to E in t4-t5. The message can also take an alternative path P2: A to B in t1-t2, B to (D, F) i

48、n time interval t2-t3, F to (C, G) in time interval t3-t4, D to E in t4-t5.P2 has less total transmission times than P1. articlemerugu2004routing, title=Routing in space and time in networks with predictable mobility, author=Merugu, Shashidhar and Ammar, Mostafa Hamed and Zegura, Ellen W, year=2004,

49、 publisher=Georgia Institute of Technologycitemerugu2004routing propose a new space-time routing framework for delay tolerant networksbookjain2004routing, title=Routing in a delay tolerant network, author=Jain, Sushant and Fall, Kevin and Patra, Rabin, volume=34, number=4, year=2004, publisher=ACMar

50、ticlekarlsson2007delay, title=Delay-tolerant broadcasting, author=Karlsson, Gunnar and Lenders, Vincent and May, Martin, journal=Broadcasting, IEEE Transactions on, volume=53, number=1, pages=369-381, year=2007, publisher=IEEEarticleWang200743,title = "Topological dynamics characterization for

51、LEO satellite networks ",journal = "Computer Networks ",volume = "51",number = "1",pages = "43 - 53",year = "2007",note = "",issn = "1389-1286",doi = "/10.1016/net.2006.04.010",url = "author = &

52、quot;Junfeng Wang and Lei Li and Mingtian Zhou",keywords = "Low earth orbit (LEO)",keywords = "Satellite networks",keywords = "Topological dynamics",keywords = "Snapshots characterization "ARTICLE634801, author=Werner, M., journal=Selected Areas in Commun

53、ications, IEEE Journal on, title=A dynamic routing concept for ATM-based satellite personal communication networks, year=1997, month=Oct, volume=15, number=8, pages=1636-1648, keywords=B-ISDN;asynchronous transfer mode;discrete time systems;internetworking;jitter;mobile satellite communication;netwo

54、rk topology;optimisation;personal communication networks;satellite links;telecommunication network routing;ATM;B-ISDN;DT-DVTR;ISL topology;LEO satellite ISL networks;LEO satellite systems;broadband services;delay jitter;discrete-time dynamic virtual topology routing;dynamic routing;intersatellite li

55、nks;low Earth orbit;medium Earth orbit;networking concept;optimization procedures;path sequences;performance;periodically time-variant ISL subnetwork;routing scheme design;satellite personal communication networks;satellite systems;source-destination node pairs;virtual topology;Aerodynamics;Artifici

56、al satellites;Asynchronous transfer mode;Low earth orbit satellites;Network topology;Personal communication networks;Quality of service;Routing;Telecommunication network topology;Telecommunication traffic, doi=10.1109/49.634801, ISSN=0733-8716,INPROCEEDINGS501983, author=Hong Seong Chang and Byoung

57、Wan Kim and Chang Gun Lee and Yanghee Choi and Sang Lyul Min and Hyun Suk Yang and Chong Sang Kim, booktitle=Global Telecommunications Conference, 1995. GLOBECOM '95., IEEE, title=Topological design and routing for low-Earth orbit satellite networks, year=1995, month=Nov, volume=1, pages=529-535 vol.1, keywords=computational complexity;mobile satellite communication;network