宇宙射線可能引發電子元件的單粒子翻轉效應，其發生的機率隨高度上升伴隨宇宙射線變強而增加。電子元件因宇宙射線引發錯誤或失效必須納入飛航安全分析與防錯設計的考量之中，因此如何正確評估輻射引發之電子元件的單粒子翻轉效應相當重要，特別是針對宇宙射線在飛航高度造成的複雜輻射場環境。有鑑於此，本研究收集一系列不同靜態隨機存取記憶體(SRAM)對於輻射照射引發之單粒子翻轉效應的截面，搭配實驗室自行開發之飛航劑量評估程式，有系統地分析這些SRAM位於台灣常見國際航線飛機上發生單粒子翻轉效應的機率，並探討其發生機率與相關參數的關係。
評估單粒子翻轉效應需要航線的累積能譜以及SRAM的單粒子翻轉截面，本研究利用NTHU飛航劑量評估程式(NTHU Flight Dose Calculator，NTHU-FDC)取得不同航線的累積能譜，並且廣泛蒐集文獻中從1997年起相關的研究結果，從中得到55個不同的SRAM其由中子、質子照射引發單粒子翻轉截面之量測數據。假設若將上述55個不同廠牌與類型的SRAM擺放於台灣常見國際航線的飛機上，我們針對2018年7月份台灣飛往世界各地的十條重要航線(阿姆斯特丹、紐約、法蘭克福、洛杉磯、雪梨、杜拜、新加坡、東京、北京及香港)，分別評估其單粒子翻轉發生的機率，並依據評估結果探討其發生機率與SRAM的儲存容量與通道長度之關係，以及不同航線的垂直截止剛度和飛行高度與單粒子翻轉率之關聯性。本研究產生了多種SRAM置於台灣飛機上的單粒子翻轉率數據，相關評估方法與成果應可提供後續飛機電子元件系統安全與防錯設計相關分析的參考。

Cosmic-ray-induced radiation field at flight altitudes causes single event upset to avionics, and the probability of its occurrence increases as the flight altitude rises as the cosmic rays become stronger. Errors or failures of avionics caused by cosmic rays must be taken into consideration of flight system safety analysis. Therefore, how to correctly evaluate the single event upset of avionics caused by radiation is very important, especially for the environment of complex radiation field caused by cosmic rays at flight altitude. In view of this, this study collected a series of cross-sections of different static random access memory (SRAM) on the single event upset induced by radiation, and used the NTHU Flight Dose Calculator (NTHU-FDC) to systematically analyze the probability of single event upset on these SRAM on popular flight routes in Taiwan, and explore the relationship between the probability of occurrence and related parameters.
Estimation of the single event upset requires the cumulative spectrum of the flight and the cross-section of each SRAM. In this study, NTHU-FDC was used to obtain the cumulative spectrum of different aviation routes. Also extensively collect relevant research results in the literature since 1997, and obtained the measurement data of 55 SRAM’s cross-sections induced by the radiation. Suppose that if the above 55 different brands and types of SRAM are placed on aircraft on popular flight routes in Taiwan, evaluate the probability of single event upset for the ten important aviation routes from Taiwan to the rest of the world in July 2018. Based on the evaluation results, the relationship between single event upset rate and the device size and the channel length of SRAM, as well as the correlation between the vertical cutoff rigidity and flight altitude of different aviation routes and the single event upset rate are discussed. This study provided a variety of SRAM single event upset rate data placed on Taiwan’s aircraft, the relevant evaluation methods and results should provide a reference for subsequent analysis of aircraft avionics system safety and mitigation techniques.

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