共查询到18条相似文献,搜索用时 109 毫秒
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基于人工蜂群算法的中继卫星任务调度研究 总被引:1,自引:0,他引:1
研究中继卫星任务调度问题可以为跟踪与数据中继卫星系统(TDRSS)的任务计划编排提供科学合理的决策方法,任务调度模型的建立与调度算法的设计是中继卫星任务调度的两个关键问题。该文针对中继卫星任务调度问题特点,综合考虑中继卫星与用户航天器之间具有可见时间窗、用户提交的任务属性、中继卫星前向资源受限等约束条件,建立了中继卫星任务调度约束规划模型并提出基于人工蜂群(ABC)算法的中继卫星任务调度算法。最后,通过仿真数据分析,表明基于人工蜂群算法的中继卫星任务调度算法是一种有效的、合理的调度方法。 相似文献
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以数据中继卫星光网络系统资源、任务和约束条件为参量,以任务对资源的选择为优化对象,提出了一种基于自适应遗传算法的数据中继卫星光网络资源调度算法.综合考虑多中继星、多时间窗口、多光学天线以及任务优先级要求,建立调度模型;采用当前任务调度时间的确定和后续任务可见时间窗口的更新的调度操作,对不同资源的任务集合进行调度安排并实现了可见时间窗口的动态更新,获得调度任务的总权值并将其作为参量计算适应度值,最后通过改进的自适应遗传算法对不同调度方案进行寻优.以3颗中继星、12颗用户星,6个光天线,60个任务为条件设置了仿真场景,仿真结果表明该算法在收敛速度、调度效率方面具有优势,适应于多任务、多天线的数据中继卫星光网络系统资源调度. 相似文献
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本文简要综述了日本天基测控通信网数据中继与跟踪卫星系统(DRTSS)的体系结构及特性、测控通信系统及其技术性能,并介绍了日本与国际联网合作的近况。 相似文献
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采用基于跟踪与数据中继卫星系统构建的天地一体化遥测、跟踪与指挥系统,不仅能有效地提高遥测、跟踪与指挥的覆盖率、定轨精度、飞行器全程测量和对多目标的同时遥测、跟踪与指挥能力,而且能够完成各类对地观测卫星的高速实时数据回传的任务。与常规的测控系统不同的是,中继星的遥测、跟踪与指挥是在地球这一复杂的背景环境下进行的,因而会受到各种各样的干扰。采用阵列天线对目标进行自适应跟踪可以实现空域滤波,使信号得到加强,干扰得到抑制。采用Matlab软件仿真了中继星对目标星的跟踪过程,并对两种经典的自适应跟踪算法(LMS,DMI)进行了研究。通过分析信号干扰比的变化,比较两种算法的跟踪性能。 相似文献
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Mr. David R. McLean Dr. Ronald G. Littlefield Mr. David S. Beyer 《Telematics and Informatics》1987,4(4):253-261
This paper describes the ERBS-TDRSS Contact Planning System (ERBS-TDRSS CPS) that has been built to help Earth Radiation Budget Satellite (ERBS) flight operations personnel generate requests for service from the Tracking and Data Relay Satellite System (TDRSS). The ERBS-TDRSS CPS is written in the C language and runs on an IBM PC-AT. It uses a graphics interface and the Transportable Inference Engine (TIE-1) developed for NASA-(Goddard Space Flight Center) GSFC. First, ERBS-TDRSS Ground Track Orbit Prediction data are electronically transferred to the ERBS flight operations area, where, in its batch mode, the ERBS-TDRSS CPS automatically generates requests for TDRSS service (usually for one week). In this process, a series of scheduling strategies is used to generate requested events while TIE-1 determines whether each requested event is consistent with ERBS scheduling constraints. As requested events are rejected, alternative context-sensitive strategies are used to generate new requested events until a schedule is completed. In the interactive scheduling mode the ERBS planner can edit a schedule that has been previously built or choose which alternative scheduling strategies the ERBS-TDRSS CPS should use to build a schedule. Finally, a report generator builds “Schedule Requests” for each separate ERBS-TDRSS contact. 相似文献
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George R. Cross Mitchell A. Potter J. Douglass Whitehead James T. Smith 《Telematics and Informatics》1991,8(4):253-265
We describe a knowledge-based system that monitors Tracking Data and Relay Satellite Systems (TDRSS) telemetry for problems in the momentum unload procedure. The system displays TDRSS telemetry and commands in real-time via X-Windows. The system constructs a momentum unload plan that agrees with the preferences of the attitude control specialists and the momentum growth characteristics of the individual spacecraft. During the execution of the plan, the system monitors the progress of the procedure and watches for unexpected problems. 相似文献
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介绍了美军天基通用数据链体系的特点,结合跟踪与数据中继卫星系统(TDRSS)现状和全球远程数据链信息传输需求,分析了TDRSS远程信息传输支持能力,提出了发展基于TDRSS的天基远程应急信息传输系统构想并预测了系统应用前景,以期对未来天基信息系统的发展和应用提供参考. 相似文献
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非平衡QPSK(UQPSK)是通过对QPSK载波的两个正交分量分配不同的功率,以达到同时传输两种不同类型及速率的二进制比特流数据的一种调制模式,现在主要用于卫星数字通信,如跟踪与数据中继卫星系统(TDRSS)以及全球定位系统(GPS).本文针对TDRSS的S波段前向链路采用的UQPSK直接序列扩频调制,提出其中频载波恢复算法的改进设计,并给出了全数字化方案的性能和理论分析.最后基于FPGA实现的方案及性能证明了算法的有效性. 相似文献
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Byoung‐Sun Lee Jeong‐Sook Lee Jae‐Hoon Kim Seong‐Pal Lee Hae‐Dong Kim Eun‐Kyou Kim Hae‐Jin Choi 《ETRI Journal》2003,25(5):387-400
Since its launching on 21 December 1999, the Korea Multi‐Purpose Satellite‐I (KOMPSAT‐I) has been successfully operated by the Mission Control Element (MCE), which was developed by the ETRI. Most of the major functions of the MCE have been successfully demonstrated and verified during the three years of the mission life of the satellite. This paper presents the operational performances of the various functions in MAPS. We show the performance and analysis of orbit determinations using ground‐based tracking data and GPS navigation solutions. We present four instances of the orbit maneuvers that guided the spacecraft from injection orbit into the nominal on‐orbit. We include the ground‐based attitude determination using telemetry data and the attitude maneuvers for imaging mission. The event prediction, mission scheduling, and command planning functions in MAPS subsequently generate the spacecraft mission operations and command plan. The fuel accounting and the realtime ground track display also support the spacecraft mission operations. 相似文献
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跟踪及数据中继卫星系统的正反向通信链路 总被引:4,自引:0,他引:4
本文讨论跟踪及数据中继卫星系统的正反向通信链路。包括:1)S波段多址勤条链路的相控阵天线地面多波束形成自适应对准;2)把TDRS上的30个单元天线的接收信号转回地面并保证各路之间相对相位,振幅的稳定;3)Ku波段单址勤务链路中TDRS与用户飞行器天线相互捕获与跟踪;4)扩频-测距码的快捕。 相似文献
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This paper addresses the electromagnetic modeling of the communication link between the automated transfer vehicle (ATV) and the Tracking & Data Relay Satellite System (TDRSS). The link is analyzed during the ISS attached phase, i.e. when the ATV is docked on the International Space Station (ISS). The main objective of the study is to verify, by adopting a deterministic approach, if in every ISS orbit there are at least 15 minutes available to safely establish the ATV-TDRSS link. 相似文献