Albedo Observation by Hayabusa2 LIDAR: Instrument Performance and Error Evaluation
Albedo Observation by Hayabusa2 LIDAR: Instrument Performance and Error Evaluation
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Hayabusa2 LIDAR 的反照率观测：仪器性能和误差评估
DOI：
10.1007/s11214-016-0240-9
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发表时间：
2016
影响因子：
10.3
通讯作者：
K. Matsumoto
中科院分区：
文献类型：
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作者：
R. Yamada;H. Senshu;N. Namiki;T. Mizuno;S. Abe;F. Yoshida;H. Noda;N. Hirata;S. Oshigami;H. Araki;Y. Ishihara;K. Matsumoto
日本小行星探测器隼鸟2号于2014年底发射。隼鸟2号将观测近地C型小行星162173 Ryugu（1999 JU3），并在2020年将表面物质样本带回地球。它配备了用于激光测距的光探测和测距（LIDAR）仪器，可用于测量发射和接收脉冲的强度。利用这些强度数据可以估算出1.064 μm激光波长下的Ryugu法向散射。为了进行这一估计，我们通过LIDAR飞行模型的验证测试，确定了激光模块和接收机的传递函数，将强度数据转换为脉冲能量，沿着返回脉冲能量的利用率。然后，我们评估了正常的时间序列的误差。这一误差不仅受到激光雷达性能的影响，而且还受到小行星表面坡度和粗糙度的影响。在本文中，我们集中在正常的大气中的误差，仅由于仪器误差，这将是18.0%，在名义高度为20公里的观测。
The Japanese asteroid explorer Hayabusa2 was launched at the end of 2014. Hayabusa2 is supposed to observe the near-Earth C-type asteroid 162173 Ryugu (1999 JU3) and bring surface material samples back to Earth in 2020. It is equipped with Light Detection and Ranging (LIDAR) instrument for laser ranging which can be used to measure the intensities of transmitted and received pulses. The intensity data can be used to estimate the normal albedo of Ryugu at a laser wavelength of 1.064 μm. To perform this estimation, we determined the transfer functions of the laser module and receiver to convert the intensity data into pulse energies, along with the utilization ratio of the returned pulse energy, through verification tests of the LIDAR flight model. Then, we evaluated the error of the normal albedo. This error is affected not only by the performance of the LIDAR but also by the slope and roughness of the asteroid’s surface. In this paper, we focus on the error in the normal albedo due only to the instrument error, which will be 18.0 % in an observation at a nominal altitude of 20 km.