Predictions of the Single Event Upset in Space Applicationormalsize
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摘要: 根据SSO上两卫星搭载的三个PREM测得的空间中重离子LET谱，以及利用Weibull分布模型拟合出的不同器件的σ-LET曲线，对由空间中重离子引起的单粒子翻转的翻转率进行了预测估算.将预测值与实测值对比，分析了影响翻转率的因素.对于相同器件，翻转率与设备在卫星上的位置和朝向有关.位于卫星尾部面向后退（-x）方向的翻转率高于位于底部对地（+z）方向的器件翻转率；太阳活动水平高的时间段翻转率高于太阳活动水平低的时间段.探测器接收的重离子微分LET谱的强度和硬度决定了器件的单粒子翻转率.在高于翻转LET阈值时，LET谱的强度越高，其硬度和翻转率越大.不同器件的翻转率也不相同.Abstract: According to the heavy-ion LET spectra measured by 3 PREMs onboard 2 satellites of SSO and several devices' σ-LET curves which obey the Weibull distribution, the SEU-rate caused by heavy ions in space is estimated. The prediction of SEU-rate and the measured values are compared, and the influencing factors of SEU-rate are analyzed. The position and facing direction of the device are important factors for SEU-rate. Devices located at the end of the satellite and facing to anti-forward (-x) direction have higher SEU-rate than those located at the bottom of the satellite and facing to ground. Apart from that, the SEU-rate during the maximum of the solar activity is higher than that during solar ebb. Both above can attribute to the intensity and range of the differential LET spectra of heavy ions in space. Above the SEU threshold of the devices, the stronger the intensity of LET spectrum is, the higher the SEU-rate will be. And the harder the LET spectrum is, the higher the SEU-rate will be. The SEU-rate will differ according to different device.
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Key words:
- Prediction of SEU-rate /
- SEE /
- Heavy-ion LET spectrum
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