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首页> 外文期刊>Advances in space research >Hypertemporal photometric measurement of spaceborne mirrors specular reflectivity for Laser Time Transfer link model
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Hypertemporal photometric measurement of spaceborne mirrors specular reflectivity for Laser Time Transfer link model

机译：激光时间传递链接模型的星光镜镜面反射率的超时光度测量

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The hypertemporal light curves of the sunlit Ajisai satellite allow for reflectivity measurement of the individual on-board mirror panels. The photon counting technology developed at Graz Satellite Laser Ranging (SLR) station makes it possible to distinguish between the solar flux diffused and specularly reflected off the spinning Ajisai. The flux intensities measured at 10 kHz sampling rate during the period from Oct. 2015 until Jan. 2018 are analyzed through the spacecraft micro-model link budget equation and indicate reflectivity of the 149 mirrors of between 82.3% and 88.2% with the mean value of 85.3% and the RMS of 1.2%. It is predicted that this high specular reflectivity of the satellite will allow for the establishment of a laser link between the distant ground locations with the individual mirrors acting as a zero-latency, passive optical relay. Simulations of the laser link between the Matera (Italy) and Graz (Austria) SLR systems via spaceborne mirror reflections indicate that such a channel can be operated at mean signal strength of 3.46 photoelectrons per laser pulse. The predicted mean number of the laser link intervals per pass is 874.6 with a mean interval duration of 9.15 ms. (C) 2019 COSPAR. Published by Elsevier Ltd. All rights reserved.
机译：阳光照射的Ajisai卫星的超时光曲线允许测量单个车载镜面板的反射率。格拉茨卫星激光测距（SLR）站开发的光子计数技术可以区分旋转的Ajisai散射的和镜面反射的太阳通量。通过航天器微模型链路预算方程分析了2015年10月至2018年1月期间以10 kHz采样率测得的通量强度，并表明149个反射镜的反射率在82.3％至88.2％之间，平均值为85.3％，RMS为1.2％。据预测，卫星的这种高镜面反射率将允许在遥远的地面位置之间建立激光链路，并且各个反射镜充当零延迟的无源光中继器。通过太空镜反射对马泰拉（意大利）和格拉茨（奥地利）SLR系统之间的激光链接进行的仿真表明，这样的通道可以在每个激光脉冲3.46光电子的平均信号强度下工作。每次通过的激光链接间隔的预计平均数为874.6，平均间隔持续时间为9.15 ms。 （C）2019 COSPAR。由Elsevier Ltd.出版。保留所有权利。

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