COTS星载计算机容错设计及可靠性研究

Fault-Tolerant Design and Spatial Application Reliability of COTS On-Board Computer

为了实现微小卫星“好、快、省”的目标,商业货架产品(Commercial off-the-shelf,COTS)被大量采用,如何确保COTS产品的可靠性是必须要解决的问题.以基于工业器件的计算机产品为例,针对星载计算机产品存在的空间应用无可靠性预计指标、无抗单粒子设计等问题,开展了星载计算机容错设计及空间应用可靠性研究.为了保证星载计算机高可靠性航天应用,从产品的设计、分析、试验等方面提出了有效的保证措施.最后,利用星载计算机加速寿命试验数据和在轨实际运行表现证明了该方法的有效性;可靠性评估结果表明星载计算机三年内可靠度可以达到0.976以上(置信度取0.6),能够实现高可靠航天应用.

In order to achieve goal of the‘Better,Faster,Cheaper’of the micro-small satellites,the COTS(commercial off-the-shelf)products are widely adopted,how to ensure the reliability of COTS products is a problem that must be solved.Taking the computer products of Commercial Shelf as an example,for the problems of on-board computer products,such as no reliability index,no total dose index,no resistance single particle protection design,no component level screening and so on,the research of space application reliability for the on-borad compuer is carried out.In order to ensure the high reliability of on-board computer in aerospace applications,the effective measures are put forward from the aspects of product reliability design,analysis,test and so on.Finally,the effectiveness of the method is proved by using the data of on-board computer accelerated life test and the actual in orbit operation performance.The reliability evaluation results show that the reliability of on-board computer can reach more than 0.975 in three years(confidence level 0.6),which can realize high reliability in aerospace applications.