CAST968平台小卫星在轨故障分析和建议

统计CAST968平台从2000年至2014年在轨发生的142次故障，分析发现故障性质、故障原因、故障产品类别、故障时间和故障分系统等都存在明显的规律性.对决定卫星成败的姿态轨道控制分系统进行故障原因、故障单机和故障产品类别三个方面的统计分析，总结出设计、环境和器材是导致姿轨控分系统故障的三大重要因素.简要分析其他分系统，最后给出故障预防和设计建议，包括加强抗辐照设计、关键单机和电路的冗余设计等.

On-Orbit Failure Statistical Analysis and Suggestions for Small Satellites of CAST968 Platform

Statistics is made based on 142 failures of CAST968 platform small satellites from 2000 to 2014. The analysis results show that there are obvious regularities in failure characters, reasons, component types, time, subsystems, etc. Considering the importance of attitude and orbit control subsystem (AOCS) for the success of satellite mission, the statistics on failure reasons, components and component types of AOCS are analyzed. The design，environment and equipment are the three important factors resulting in AOCS failures. A brief analysis of the other subsystems is presented. Finally, failure prevention and design suggestions are given, including optimizing the designs of anti irradiation, key components and circuits’ redundancy, etc.