Subjects: Geosciences >> Space Physics submitted time 2016-05-13
Abstract： By utilizing data obtained on Chinese satellite in the middle Earth orbit from solar activity descending phase to solar activity ascending phase, the properties of high energy electron environment in the middle Earth orbit are analyzed, such as spatial distribution, flux intensity, temporal variations, and response to geomagnetic storms. The investigating results indicate that the spatial distribution of high energy electron in the middle Earth orbit is stable;the fluxes of electrons decrease with energy increasing;the high energy electron environment is a dynamical system which disturbs evidently on different timescales;the evolvement of this system is stimulated by geomagnetic storms, but the correlation between the evolvement and the storms is nonlinear.
Peer Review Status:
Awaiting Review
Subjects: Geosciences >> Space Physics submitted time 2016-04-22
Abstract： Regarding the shutter of space imager as the research background,the advantages and disadvantages of different types of shutters are introduced. The rotary-disc shutter is selected as the research object. Starting from the mode of exposure, the control strategy of shutter is investigated. The reason for selecting PMSM motor is analyzed, and a controller based on Digital Signal Processor (DSP) is designed. Furthermore, the maximum error of exposure time is less than 3.0%, which meets the performance requirements of telescope imager.
Peer Review Status:Awaiting Review
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