共查询到18条相似文献,搜索用时 187 毫秒
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遥感卫星在轨故障统计与分析 总被引:1,自引:1,他引:1
对遥感卫星1988年—2014年的在轨故障数据进行分类研究发现:控制、载荷、测控和数传是遥感卫星在轨故障发生比例最高的4个分系统;故障主要发生于在轨第1年;环境、设计和器件类故障为主要的在轨故障类型;大多数故障可以通过在轨自主诊断、地面操作等方式及时予以解决, 对遥感卫星完成任务的固有能力影响较小;各分系统的在轨故障特点各不相同。文章最后针对故障原因, 提出了增加遥感卫星的地面试验与测试、加强抗辐射加固设计和开展基于在轨故障规律的分系统技术状态控制等对策, 以降低卫星的在轨故障率, 保证卫星在轨可靠、安全运行。 相似文献
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分析国内外近10多年来的卫星在轨故障情况,总结6类灾难性及严重在轨故障模式;提炼出星上典型设备/部件的主要在轨故障模式.在此基础上,从新技术及新状态的地面验证充分性、复杂工艺的稳定性、元器件及电装质量、空间环境影响、软件设计、地面操作等方面分析在轨故障的主要原因,并给出措施建议,旨在为卫星系统可靠性设计、主要设备/部件... 相似文献
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地球静止轨道卫星在轨故障时,完成卫星故障现象的排查与确认,实施其后的处理工作,对保证星地测控链路通畅至关重要。根据地球静止轨道卫星的工作特点,描述了保证卫星能源供应、保证测控链路通畅等4项卫星在轨故障处理原则。简要介绍了地球静止轨道卫星平台测控分系统的主要技术状态,进行了测控链路分析;根据测控链路余量,从卫星、地面测控站两个方面,提出卫星在轨故障时测控上行、下行链路的处理措施。这些措施均经过卫星的飞行验证,证明行之有效。 相似文献
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卫星太阳电池阵在轨故障统计及分析 总被引:1,自引:0,他引:1
文章针对2000年1月至2012年9月期间79颗在轨卫星发生的114次太阳电池阵故障事件进行了分类统计分析,并利用Kaplan-Meier估计量分析方法对这些在轨故障进行了可靠性分析。结果表明:太阳电池阵的故障多发生在卫星在轨第一年,其中电子类故障发生率较高;不同卫星平台的系统缺陷或设计共性问题也与太阳电池阵故障紧密相关。最后,结合我国卫星太阳电池阵设计及制造工艺技术,提出了加强出厂前的测试和试验验证、加强仿真建模、加强冗余设计等建议。 相似文献
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卫星控制系统故障仿真技术研究 总被引:2,自引:0,他引:2
首先分析卫星控制系统可能发生故障的各种原因、现象及防止故障的各种措施,讨论仿真技术在卫星故障诊断和对策中应用,然后介绍卫星故障仿真的工具-卫星飞行控制模拟系统。 相似文献
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Health scorecard of spacecraft platforms: Track record of on-orbit anomalies and failures and preliminary comparative analysis 总被引:1,自引:0,他引:1
Choosing the “right” satellite platform for a given market and mission requirements is a major investment decision for a satellite operator. With a variety of platforms available on the market from different manufacturers, and multiple offerings from the same manufacturer, the down-selection process can be quite involved. In addition, because data for on-obit failures and anomalies per platform is unavailable, incomplete, or fragmented, it is difficult to compare options and make an informed choice with respect to the critical attribute of field reliability of different platforms. In this work, we first survey a large number of geosynchronous satellite platforms by the major satellite manufacturers, and we provide a brief overview of their technical characteristics, timeline of introduction, and number of units launched. We then analyze an extensive database of satellite failures and anomalies, and develop for each platform a “health scorecard” that includes all the minor and major anomalies, and complete failures—that is failure events of different severities—observed on-orbit for each platform. We identify the subsystems that drive these failure events and how much each subsystem contributes to these events for each platform. In addition, we provide the percentage of units in each platform which have experienced failure events, and, after calculating the total number of years logged on-orbit by each platform, we compute its corresponding average failure and anomaly rate. We conclude this work with a preliminary comparative analysis of the health scorecards of different platforms.The concept of a “health scorecard” here introduced provides a useful snapshot of the failure and anomaly track record of a spacecraft platform on orbit. As such, it constitutes a useful and transparent benchmark that can be used by satellite operators to inform their acquisition choices (“inform” not “base” as other considerations are factored in when comparing different spacecraft platforms), and by satellite manufacturers to guide their testing and reliability improvement programs. Finally, it is important to keep in mind that these health scorecards should be considered dynamic documents to be updated on a regular basis if they are to remain accurate and relevant for comparative analysis purposes, as new information will impact their content. 相似文献
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东方红三号系列卫星在轨故障统计分析 总被引:5,自引:2,他引:3
迄今为止,东方红三号系列卫星累计运行时间已近30年,积累了相当可观的故障数据。文章在统计5颗卫星在轨故障信息的基础上,分析了该型卫星在轨故障随工作时间的总体变化规律,不同后果的故障和不同分系统的故障随工作时间的变化规律,以及卫星的可靠性增长。结论认为,该型早期卫星故障符合典型的浴盆曲线模型,早期故障较多,后期故障频繁;该型后期卫星同样存在早期失效,但特征不明显,除去空间干扰因素,卫星运行期间故障趋势相对平缓,卫星可靠性明显提高。 相似文献
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三轴稳定遥感卫星姿控系统故障情况下的系统重构 总被引:1,自引:0,他引:1
论述三轴对地稳定遥感卫星姿控系统中部分轮子或部分陀螺故障情况下的姿控系统重构。文中论述了只在俯仰通道有一偏置动量轮正常工作,而滚动和偏航通道轮子故障条件下的系统重构。另外还论述了偏航陀螺故障,姿控系统其它部件正常情况下,控制系统采用Whecon原理与PIM控制相结合的设计。以上两种系统重构拟用于实际系统中,经过数学仿真验证,姿控系统在故障情况下能够完成基本任务。 相似文献
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随着天气观测、研究和规划的进展,气象雷达技术的开发工作取得了重大进展。脉冲压缩使新一代低成本、紧凑型星载天气雷达系统成为可能。为了抑制脉压带来的距离旁瓣,目标探测雷达通常采用基于幅度调制和失配滤波的方法,但由于其存在主瓣扩展和功率损失等缺点,不适用于气象观测。非线性调频(NLFM)信号可以调整其功率谱密度,在明显不降低信噪比的情况下提供较低的旁瓣输出。本文设计了一种新的波形优化框架。该框架通过多目标粒子群优化算法(MOPOS)构造了一种针对气象粒子目标的非线性调频(NLFM)脉冲压缩波形,实现了极低的距离旁瓣电平和较高的多普勒容限,可以显著地缓解非常有限的卫星峰值功率的限制和卫星平台运动导致的多普勒对系统影响。仿真实验结果表明:改进的非线性调频波形具有良好的性能。 相似文献
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A study of on-orbit spacecraft failures 总被引:4,自引:0,他引:4
Mak Tafazoli 《Acta Astronautica》2009,64(2-3):195-205
Even though spacecraft are carefully designed and tested to meet their mission lifetime, many suffer unrecoverable on-orbit failures very early. Other spacecraft, despite severe failures, are able to exceed their expected lifetime when effective failure recovery procedures are applied. In 2005, a study of on-orbit spacecraft failures was undertaken which resulted in identifying 156 failures occurring from 1980 to 2005 on civil and military spacecraft. These failures were analyzed to compare different spacecraft subsystems and estimate their impact on the mission. Although there is no perfect system that could prevent any failure, the lessons learned from the past years show that adequate testing, redundancy and flexibility are the keys to a reliable spacecraft failure recovery system. 相似文献