Internal  charging effect is a main cause of geosynchronous satellite anomalies  and failures. Recently we have achieved some results on this effect both  by testing and modeling. And these results provide a positive  application for some space mission.

Our  lab has developed the second generation facility to perform an internal  charging simulation which can simulate severe internal charging  environment of outer belt, and can perform satellite part or unit level  testing. Moreover, the technique for analysis of the realistic satellite  internal charging by a 3-D model is developed successfully. This  technique can be used to assess the charging risk of GEO and MEO  satellites. Recently, some ground testing and computer modeling are  carried out for key satellite components and units in some important  space mission. In this test, we found a phenomenon that discharging made  the unit work abnormally, and this abnormal phenomenon is  correspondence with abnormalities which occur in orbit. Meanwhile, some  related basic laws are acquired which can apply references for the  future missions.