AEROSPACE SHANGHAI, Volume. 42, Issue 4, 120(2025)

Risk Assessment Methodologies for CCU Radiation Probability Based on Reliability Models

Yiwen LUO1, Zhengdong SONG2, Shaoxi ZHANG1, Wei ZHANG1, Haoran SUN1, and Pengfei LIAN1、*
Author Affiliations
  • 1Department of Electronic Engineering,East China Normal University,Shanghai200241,China
  • 2Shanghai Institute of Aerospace Technology Foundation,Shanghai201109,China
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    Figures & Tables(16)
    Ground test data of the PROM SEU rate
    Entropy values of different distribution functions
    Modeling of the mission reliability model
    Monte Carlo simulation process of the CCU system
    MCMC simulation results of signal acquisition
    Monte Carlo simulation results of the CCU when the fixed machine function is not enabled
    Monte Carlo simulation results of the CCU when the fixed machine function is enabled
    Comparison of the failure probabilities for the CCU system
    • Table 1. Distribution functions and entropy values of the memories

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      Table 1. Distribution functions and entropy values of the memories

      分布函数名称分布参数熵值大小
      abLocScale
      指数分布--1.59×10-156.74×10-16-32.99
      对数正态分布3.00--5.89×10-172.20×10-15-3.69
      威布尔分布0.62-1.99×10-177.76×10-16-22.24
    • Table 2. EDAC hardening information of the memories

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      Table 2. EDAC hardening information of the memories

      变量名描述本文取值单位
      λ单粒子翻转率符合分布对数正态分布次/(位·d)
      m单个码字的长度,包含信息位和校验位72bit
      n信息位长度,即一个码字中信息位的长度64bit
      Tr“运行”任务的最大执行时间0.42s
      Ti“纠错”任务的最大执行时间0.58s
      Ts“刷新”任务的最大执行时间0.01s
      M系统中原需要保护代码的总码字数,即n比特码字的个数39 321
      M1增加的“刷新”任务所占代码段的总码字数,即n比特码字的个数228
      S每次运行的代码量占总受保护代码量的百分比10%
      T总任务时间1a
    • Table 3. Importance table of each component

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      Table 3. Importance table of each component

      组件名称组件概率 重要度组件结构 重要度组件相对 重要度
      CPU(A)-1/2/3/40.040.001 900.83
      PROM-A0.050.003 800.66
      MRAM-A0.050.003 600.72
      SRAM-A0.050.003 600.77
      PS-A0.020.001 500.79
      IO-A0.010.001 500.75
      CPU(B)-1/2/3/40.050.000 150.93
      PROM-B0.130.000 150.95
      MRAM-B0.130.000 150.98
      SRAM-B0.130.000 150.95
      PS-B0.030.001 400.91
      IO-B0.020.001 400.90
      PS-FTA0.010.000 950.45
      PS-FTB0.020.000 950.64
    • Table 4. Importance ranking of the components

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      Table 4. Importance ranking of the components

      序号重要度排序
      组件概率PROM-B≥MRAM-B≥SRAM-B>CPU(B)-1/2/3/4≥PROM-A≥MRAM-A≥SRAM-A>PS-B≥CPU(A)-1/2/3/4>PS-A≥IO-B≥PS-FTB>IO-A≥PS-FTA
      组件结构IO-A≥PS-A>O-B≥PS-B>PROM-A≥MRAM-A≥SRAM-A>PROM-B≥MRAM-B≥SRAM-B>CPU(A)-1/2/3/4>CPU(B)-1/2/3/4>PS-FTA≥PS-FTB
      相对重要度CUP(B)-1/2/3/4>IO-B≥PS-B≥MRAM-B>PROM-B≥SRAM-B>CPU(A)-1/2/3/4>PS-A>MRAM-A>IO-A>SRAM-A>PROM-A>PS-FTB>PS-FTA
    • Table 5. Importance level classification of the system components

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      Table 5. Importance level classification of the system components

      程度等级组件名称
      轻微aPS-FTB,PS-FTA
      轻度bPRAO-A,IO-A,CPU(A)-1/2/3/4
      中等cMRAM-A,PS-A,SRAM-A
      dPROM-B,IO-B,CPU(B)-1/2/3/4
      超高eMRAM-B,PS-B,SRAM-B
    • Table 6. Severity level classification of the system components

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      Table 6. Severity level classification of the system components

      程度等级组件名称
      轻微ACPU(A)-1/2/3/4,CPU(B)-1/2/3/4
      轻度BPS-FTB,PS-FTA
      中等CPS-A,PS-B,IO-A,IO-B
      严重DMRAM-B,SRAM-B,PROM-B
      灾难EMRAM-A,SRAM-A,PROM-A
    • Table 7. Assessment level table of the system risks

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      Table 7. Assessment level table of the system risks

      程度综合等级

      风险综合

      评价指数

      组件名称备注使用准则
      极低Aa、Ab、Ac、Ba、Bb、CaPS-FTB,PS-FTA,CPU(A)-1/2/3/4低风险可接受风险
      Ad、Bc、CbIO-A CPU(B)-1/2/3/4
      中等Ae、Bd、Cc、Cd、Da、Db、Dc、Ea、EbPROM-A,PS-A,IO-B中风险由任务决策
      Ce、Dd、EcMRAM-A,SRAM-A,PROM-B,PS-B高风险不可接受风险
    • Table 8. Risk calculation results of the system components

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      Table 8. Risk calculation results of the system components

      组件名称危害度风险值风险等级
      MRAM-B10⁻¹8.2×10⁻³
      SRAM-B10⁻¹7.6×10⁻³
      PROM-B10⁻¹8.9×10⁻³
      MRAM-A10⁻²5.8×10⁻⁴
      SRAM-A10⁻²5.3×10⁻⁴
      PROM-A10⁻²6.2×10⁻⁴
      其他组件10⁻³~10⁻²<5×10⁻⁴
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    Yiwen LUO, Zhengdong SONG, Shaoxi ZHANG, Wei ZHANG, Haoran SUN, Pengfei LIAN. Risk Assessment Methodologies for CCU Radiation Probability Based on Reliability Models[J]. AEROSPACE SHANGHAI, 2025, 42(4): 120

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    Paper Information

    Category: Components and Devices Failure Physics

    Received: May. 30, 2025

    Accepted: --

    Published Online: Sep. 29, 2025

    The Author Email:

    DOI:10.19328/j.cnki.2096-8655.2025.04.014

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