Impact of FY2 Satellite Special Events on Quantity and Quality of Cloud Images
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Abstract:
Taking FY2E satellite as an example, the operation data accumulated by NSMC from January 2010 to December 2013 are studied to analyze the number, proportion and time distribution of the cloud images affected by the special events. The mechanism, occurrence regularity and impact of the special events on cloud images are analyzed, and suggestions for improvement are put forward accordingly to reduce the impact of special events. The results show that the number of cloud images affected by special events accounts for 282 percent of the planned number of received images, and the sequence of the impact of special events on cloud images is: earth shadow, station keeping and attitude determination, sun transit outage, lunar, solar image and stray radiation interference, losing lock of antenna, and lunar shadow. The respective percentages of cloud images affected by these special events are: 9400%, 282%, 141%, 067%, 059%, and 052% approximately. About 97% of the affected cloud images are distributed between February to April and August to October, because earth shadow, sun transit outage, and solar image interference occurs before or after the vernal equinox and autumnal equinox each year, and the other special events have no relation with seasons and solar terms. In order to reduce the impact of special events, ground systems should make more accurate cloud image observation plans based on the prediction time of earth shadow and choose reasonably orbital station keeping and attitude determination time. FY2 satellites should improve the design and technology of optical system and electronic devices.
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Supported by:Beijing E-Tiller Technology Development Co., Ltd.
Supported by:Beijing E-Tiller Technology Development Co., Ltd.