利用分时刷新和位置约束的卫星载荷BRAM抗辐照设计方法

为解决星载资源严格受限条件下,静态随机存取存储器型现场可编程门阵列中块随机存储器(block random access memory, BRAM)的轻量级、高可靠抗辐照加固难题,提出了一种基于分时刷新和位置约束的卫星载荷BRAM抗辐照加固设计方法,通过监控算法执行时隙实现BRAM分时刷新,并增加位置约束有效降低三模冗余后两模设计同时发生异常的概率,以较少的资源消耗有效提升BRAM在轨抗辐照可靠性。重离子加速试验结果表明,采用分时刷新和位置约束加固方法后,卫星载荷单粒子功能中断截面下降约81.63%,在轨BRAM异常由3颗星2年发生3次减少为25颗星2年未发生,在轨抗辐照可靠性大幅提升。

BRAM anti-irradiation design method for satellite payloads using time-sharing refreshing and location constraint

In order to solve the problem of lightweight and high-reliability anti-irradiation hardening for BRAM(block random access memory) in static random access memory-based field programmable gate array under the strict limitation of space-borne resources, BRAM anti-irradiation hardening design method based on time-sharing refreshing and location constraint was proposed. The time-sharing refreshing of the BRAM was realized through monitoring time slot of algorithm execution, and location constraint was added to effectively reduce the probability of simultaneous anomalies of two modules under the design of triple modular redundancy, effectively improving the reliability of BRAM radiation resistance with less resource consumption. The results of heavy ion acceleration test show that after adopting the time-sharing refreshing and location constraint hardening methods, the single event function interruption cross section of a certain type of satellite payload in our laboratory has decreased by about 81.63%. The BRAM anomaly on navigation satellites has been reduced from 3 stars, which occurred 3 times in 2 years, to 25 stars that have not occurred in 2 years, and the reliability of radiation resistance has been greatly improved.