摘要
针对近地卫星在轨运行中的单粒子翻转事件(Single Event Upset,SEU)的退火问题,选取某卫星器件长期积累的SEU数据为样本,在分析器件长期温度变化的基础上,详细统计SEU事件的星下点以及年、月等时空分布特征,并讨论SEU事件与地球磁场分布、F10.7曲线、中子监测数据的关联特性,最后以SEU事件发生的平均间隔为目标,建立退火模型,用实际数据进行退火估计。结果表明,SEU事件星下点发生在南大西洋异常区的达到67%以上,发生在南、北两极高纬度区域的超过16%,其它区域的不足17%;8、9、10、12这4个月份的SEU事件最多,占全年的38%以上;以远、近日点为参考时,发生在4～9月的约占50%,发生在其它月份的也在50%附近,两者十分接近;长期SEU事件受宇宙射线、太阳活动影响明显,长期性变化以宇宙射线影响为主,短期性变化以太阳活动影响为主;在轨道周期内温度变化约2℃、长期温升接近5℃的条件下,SEU事件时间间隔的均值约4.57d,退火零值约1.56×10-13 d,退火因子约7.94×10-15 d-1,衰减零值约24.34d,衰减因子约0.12d-1,退火特征并不明显,退火影响可不用考虑。
To examine the annealing effect of Single Event Upsets(SEU),a single device from a Low Earth Orbit(LEO)satellite running in sun-synchronous orbit for more than nine years was selected as a sample.The working temperature from satellite telemetry data was investigated,and details of the SEU nadir and time were discussed in relation to the geomagnetic field,F10.7,neutrons monitoring data,etc.By averaging the SEU time intervals,a model was developed to estimate the annealing characteristics,and this model was analyzed using telemetry data.The results of this analysis indicate that the SEU nadir occurred above the South Atlantic Abnormal area more than 67% of the time,more than 16%over the polar area,and less than 17%over the remaining areas.Moreover,the SEUs have the highest probability of occurrence(more than 38%)in August,September,October,and December.However,the probabilities are equal when one group of months spans April to September and the other group contains the remaining months.Furthermore,the SEU frequency is influenced by cosmic rays in the long-term when the sun is relatively quiet and by the sun in the short-term when the sun is relatively active.The annealing estimation shows that the mean time interval between SEUs is about 4.57 d,the annealing zero value is close to 1.56×10-13 d with an annealing factor of 7.94×10-15 d-1,and the degradation zero value is nearly 24.34 dwith a factor of 0.12 d-1.The estimation results indicate that the annealing effect is approximately negligible.
作者
李强
李会锋
孙先伟
耿西英智
朱俊
LI Qiang;LI Hui-feng;SUN Xian-wei;GENGXI Ying-zhi;ZHU Jun(Key Laboratory of Spacecraft In-Orbit Fault Diagnosis and Maintenance,Xi′an 710043,China;Xi′an Satellite Control Center,Xi′an 710043,China)
出处
《光学精密工程》
EI
CAS
CSCD
北大核心
2019年第2期458-468,共11页
Optics and Precision Engineering
基金
青年科学基金资助项目(No.11503096)
关键词
空间环境
近地卫星
单粒子翻转
退火效应
估计
space environment
Low Earth Orbit(LEO)
Single Event Upset(SEU)
annealing effect
estimation
