Calibration Method of Wave Polarization Data Obtained by KAGUYA/WFC
Calibration Method of Wave Polarization Data Obtained by KAGUYA/WFC
复制标题
KAGUYA/WFC获得的波偏振数据的校准方法
DOI：
10.1002/2015rs005927
复制
发表时间：
2016
期刊：
影响因子：
1.6
通讯作者：
and Kozo Hashimoto
中科院分区：
文献类型：
--
作者：
Yoshitaka Goto;Kazuaki Uda;Yoshiya Kasahara;and Kozo Hashimoto
介绍了KAGUYA月球探测器上波形捕获仪（WFC）所获得的偏振数据的一种标定方法。为了获得KAGUYA观测到的等离子体波的正确极化，有必要消除接收机两个正交通道之间的机载延迟差异。为此，我们使用自然波的观测数据，而不是由于使命期间的技术问题而无法获得的机载校准信号。KAGUYA经常观测到来自地球的极光千米辐射（AKR），这种辐射具有偏振性。利用特定条件下获得的AKR数据确定相位差。结果，以足够的精度校准偏振数据。所提出的校准方法不是专门用于KAGUYA数据，但它可以适用于在未来的任务中使用类似类型的接收器获得的波数据。
A calibration method for wave polarization data obtained by waveform capture (WFC) instrument on a lunar orbiter KAGUYA is introduced. In order to obtain correct polarizations of plasma waves observed by KAGUYA, it is necessary to remove the difference of onboard delays between two orthogonal channels of the receiver. For that purpose, we use observation data of natural waves instead of onboard calibration signals which were not available due to a technical problem during the mission period. KAGUYA often observed auroral kilometric radiation (AKR) from the Earth, which had polarizations. The phase differences are determined by using AKR data obtained under a specific condition. As a result, the polarization data are calibrated with a sufficient accuracy. The proposed calibration method is not specialized for the KAGUYA data but it can be applied to wave data obtained with similar types of receivers in future missions.