卫星介质深层充电中的主要物理问题  

KEY PHYSICAL PROBLEMS IN DEEP DIELECTRIC CHARGING ON SATELLITES

作　　者：黄建国[1] 陈东[1] 师立勤[1] 

机构地区：[1]中国科学院空间科学与应用研究中心,北京100080

出　　处：《空间科学学报》2004年第5期346-353,共8页Chinese Journal of Space Science

基　　金：国家863青年基金项目资助(863-2-7-7-1)

摘　　要：卫星介质深层充电效应是诱发地球同步轨道卫星运行故障和异常的重要因素之一,通过 计算机模拟对介质深层充电的时间常数、电场特征、以及屏蔽、介质厚度和接地方式对充电 所致最大电场的影响等主要物理问题进行了详细的分析,并给出了初步的防护措施.Deep dielectric charging (DDC) is one of the key factors inducing malfunctions and failures on geo-synchronous satellites. In this paper, the mam problems such as charging time, electric field distribution, as well as influences on DDC-induced maximum field by shield, dielectric thickness and grounding patterns are studied in detail, and some results of computer simulation are introduced for the plannar model. In the meantime, some preliminary measures for DDC protection are re-commended accordingly. The charging time depends on both dielectric parameters and flux of high ener-getic electrons in the space environment. For epoxy, a kind of usually used dielectric material on satellites, the charging time is in the order of hours. The electric field distribution in the dielectric is determined by the grounding pattern. For the case grounded on single side, the maximum field generally appears on the grounded side with the other side having zero field. While for the case grounded on both sides, both sides have maximum fields, with values smaller than single-grounded case. Moreover, the maximum field in the dielectric is related to the thickness of the dielectric itself and the applied shield. The maximum field increases with the dielectric thickness to a saturated value, and decreases with the shield thickness, however, contribution of the shield over a certain thickness is neglegible.

关 键 词：介质深层充电 高能电子 计算机模拟 接地方式 地球同步轨道卫星 

分 类 号：V419[航空宇航科学与技术—航空宇航推进理论与工程]