• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文会议>Materials in space environment >VARIATIONS IN THE TELEMETRY OF AN OFFEQ SATELLITE'S SUN SENSORS
【24h】

VARIATIONS IN THE TELEMETRY OF AN OFFEQ SATELLITE'S SUN SENSORS

机译：OFFEQ卫星太阳传感器遥测的变化

获取原文
获取原文并翻译 | 示例
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

One of the Israeli Offeq satellites has two fine solar aspect sensors which are analog devices based on a silicon quadrant detector. They exhibited variations in the telemetry since the beginning of mission that were similar for the four quadrants of the same detector. The telemetry signals of sun sensor no.1 declined ～14% and the signals of sun sensor no.2 declined ～10% during the first day of mission. The signals of sun sensor no.1 gradually stabilized at ～60% variation (～40% of the expected signals) while those of sun sensor no.2 stabilized at ～40% variation (～60% of the expected signals). Such values were sufficient for the normal continuous operation of the sensors. The angular difference of the sun vectors, calculated from the data of the two sensors, was small but a slight increase was observed from 0.2°-0.3° during the first days of mission to 0.4°-0.6° later.rnThe goal of our investigation was to find out the possible causes for this behavior and suggest how to prevent them in future satellites. It included preliminary screening of all the possible causes, experimental and theoretical work done in order to support or exclude the remaining causes, conclusions and recommendations. The preliminary screening identified the most probable reasons for the telemetry variations as either the direct interaction of the optical window of the sun sensor with the space environment or its contamination. Our extensive computations and experiments indicated the importance of the contamination mechanisms but excluded direct interaction with the space environment as a major cause for the behavior. The most probable contamination sources were either outgassing from internal sources of the satellite and/or outgassing from one of the solar panels before their deployment. Partial fixation of the contaminants could occur by the combined effects of the space environment, especially by atomic oxygen and UV radiation. The conclusions led to recommendations for future missions.
机译：以色列Offeq卫星中的一颗具有两个精细的太阳高宽比传感器，它们是基于硅象限探测器的模拟设备。自任务开始以来，它们在遥测方面表现出变化，对于同一探测器的四个象限来说，变化是相似的。在任务的第一天，第一号太阳传感器的遥测信号下降〜14％，第二号太阳传感器的遥测信号下降〜10％。 1号太阳传感器的信号逐渐稳定在〜60％变化（约为预期信号的40％），而2号太阳传感器的信号稳定在〜40％变化（约为预期信号的60％）。这样的值对于传感器的正常连续操作是足够的。根据两个传感器的数据计算出的太阳矢量的角度差很小，但观察到从任务的第一天的0.2°-0.3°到后来的0.4°-0.6°略有增加.rn我们的研究目标找出这种行为的可能原因，并提出如何在未来的卫星中防止它们的发生。它包括对所有可能原因的初步筛选，为支持或排除其余原因，结论和建议而进行的实验和理论工作。初步筛选确定了遥测变化的最可能原因是太阳传感器的光学窗口与空间环境的直接相互作用或其污染。我们的大量计算和实验表明了污染机理的重要性，但排除了与空间环境直接相互作用的主要原因。最可能的污染源是在部署卫星之前从卫星的内部来源排出的气体和/或从其中一个太阳能电池板排出的气体。污染物的部分固定可能是由于空间环境的综合作用而发生的，特别是原子氧和紫外线辐射。结论为今后的任务提出了建议。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号