辐射易敏SRAM型FPGA在导航卫星中的适用性实验研究

利用兰州重离子加速器提供的86Kr离子束流开展了百万门SRAM型FPGA的单粒子效应实验研究.获得了该器件配置存储器和片内Block RAM的重离子翻转截面,给出了与国外同类实验结果显著差异的原因分析,证实了该器件对单粒子效应的极端敏感性;对三模冗余、动态刷新等容错机制的有效性进行了动态测试,结果表明采用的组合加固措施能显著降低系统的功能错误截面,基本消除了配置存储器额外引入的敏感性,达到了与同类专用集成电路接近的抗辐射水平;结合导航任务特点和实验结果,对SRAM型FPGA在导航卫星上的适用性进行了分析,提出了将加固设计与自主完好性监测相结合的应用思路.

Experimental study on the suitability of using SRAM based FPGAs in navigation satellite

Single event effects test results of Xilinx XC2V1000 SRAM based FPGA are present. The test uses 86Kr ions generated by Heavy Ion Research Facility in Lanzhou （HIRFL）. SEU cross section of XC2V1000’s configuration memory and BlockRAM are caculated. The discrepancy in obtained results and previously reported results is discussed as well. A Triple-Module Reduncy （TMR） hardened circuit implemented in the FPGA has been tested in two manners, i.e. with and without the configuration memory scrubbing scheme. Dynamic test results show that the combined fault tolerant scheme can reduce the functional error crosssection remarkably. The extra sensitivity to single event upsets introduced by SRAM based configuration memory, has been eliminated mostly, which leads to a comparable radiation suitability level to ASICs. Moreover, the suitability of using such radiation suceptive devices on navigation satellites are studied, a hybrid application methodology involving radiation-hardening-by-design and self-integrity monitoring is suggested.