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Terra MODIS Band 2 Electronic Crosstalk:Cause, Impact, and Mitigation

机译：Terra MODIS Band 2电子串扰：原因，影响和缓解

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The MODerate-resolution Imaging Spectroradiometer (MODIS) is one of the primary instruments in the Earth Observing System (EOS). The first MODIS instrument was launched in December, 1999 on-board the NASA EOS Terra spacecraft. MODIS has 36 bands, covering a wavelength range from 0.4 μm to 14.4 μm. MODIS collects data at three spatial resolutions: 0.25 km (2 bands), 0.5 km (5 bands), and 1 km (29 bands). In the Earth scene images of Terra MODIS band 2 (0.85μm), two sets of regularly distributed anomalous pixels are observed in each scan, of which one is brighter and the other is darker than surrounding pixels. MODIS band 2 is a 0.25 km resolution band, having 40 detectors and 4 subframes for each detector. The brighter dots correspond to the subframe 1 pixels of detector 30 and the darker dots correspond to the same subframe of detector 29. In this manuscript, it is demonstrated that the anomaly is due to electronic crosstalk. The sending bands and detectors for the crosstalk are identified using lunar images and are confirmed using the Spectroradiometric Calibration Assembly (SRCA) observations. A linear algorithm is developed to describe the crosstalk, and crosstalk coefficients are derived using lunar observations. With the derived coefficients, the dotted features in Earth view images of Terra band 2 can be significantly reduced.
机译：中等分辨率成像光谱仪（MODIS）是地球观测系统（EOS）的主要仪器之一。第一个MODIS仪器于1999年12月在NASA EOS Terra航天器上发射。 MODIS具有36个波段，覆盖0.4μm至14.4μm的波长范围。 MODIS以三种空间分辨率收集数据：0.25 km（2个波段），0.5 km（5个波段）和1 km（29个波段）。在Terra MODIS波段2（0.85μm）的地球场景图像中，每次扫描观察到两组规则分布的异常像素，其中一组比周围的像素亮，而另一组比周围的像素暗。 MODIS频段2是0.25 km的分辨率频段，具有40个检测器和每个检测器4个子帧。较亮的点对应于检测器30的子帧1像素，较暗的点对应于检测器29的相同子帧。在此手稿中，证明了异常是由于电子串扰引起的。串扰的发送频段和检测器使用月球图像进行识别，并使用光谱辐射校准组件（SRCA）观察进行确认。开发了一种线性算法来描述串扰，并使用月球观测值得出串扰系数。利用导出的系数，可以显着减少Terra波段2的地球视图图像中的点状特征。

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