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On-orbit measurement of ISS vibrations during OPALS extended mission operations

机译：在OPALS扩展任务操作期间对ISS振动进行在轨测量

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Detailed understanding of the International Space Station vibration environment, particularly for the unpressurized portions of the platform, is and has been of high interest to payload developers seeking precision pointing performance due to its potential impact on on-orbit operations. The availability of such information, however, especially measured data, has been scarce, usually forcing investigators to utilize conservative bounding assumptions. During extended mission operations aboard the ISS at ELC 1, FRAM 8, the OPALS payload conducted a series of experiments aimed at improving the understanding of this key environmental parameter. The payload was repurposed for performing open-loop tracking of a ground-based laser beacon in a step-and-stare fashion so as to minimize the effects of its own gimbal on the measurement. Following significant processing of data acquired at 100Hz, the root-mean-square jitter at the OPALS mounting location is estimated to be in the 20-30 microradians range, and may even be in the low teens under certain conditions, an order of magnitude lower than previously assumed value.
机译：对于有效载荷开发人员来说，对国际空间站的振动环境（尤其是平台的未受压部分）的详细了解已经引起了人们的极大兴趣，这是由于有效载荷开发者可能会对在轨操作产生潜在的影响。但是，此类信息（尤其是测得的数据）的可用性一直很稀缺，通常迫使研究人员使用保守的边界假设。在国际空间站（ELC 1），FRAM 8上的国际空间站（ISS）的扩展任务操作期间，OPALS有效载荷进行了一系列实验，旨在增进对这一关键环境参数的理解。有效载荷被重新调整为以步进和凝视的方式执行对地面激光信标的开环跟踪，以最大程度地减少其自身的万向架对测量的影响。在对以100Hz采集的数据进行大量处理之后，OPALS安装位置的均方根抖动估计在20-30微弧度范围内，在某些条件下甚至可能处于较低的十进制范围，幅度要低一个数量级。比以前假定的值高。

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