本文選題：鐘差預報模型　切入點：異常情況　出處：《西安電子科技大學》2013年碩士論文　論文類型：學位論文

【摘要】：對于現(xiàn)代衛(wèi)星導航系統(tǒng)而言，時間頻率與定位的緊密關系表現(xiàn)得最為突出。在衛(wèi)星導航系統(tǒng)中，用戶接收機的定位依賴于高精度的空間基準和時間基準，而其實時定位需要使用高精度衛(wèi)星鐘預報參數(shù)。在滿足高精度時間同步的前提下，衛(wèi)星鐘差預報對導航系統(tǒng)的定位和授時影響重大。 本文著重于衛(wèi)星時頻標準性能（衛(wèi)星鐘差）預報技術的研究。通過分析衛(wèi)星鐘差預報模型中的二次多項式模型、灰色模型以及kalman預報模型的預報結(jié)果，提出各模型算法的適用性與局限性，并對其模型加以比對。重點分析了星載鐘可能發(fā)生的異常情況，包括調(diào)頻、調(diào)相與鐘切換。通過對原子鐘時頻特性的分析與對歷史運行參數(shù)的研究，可歸納出信號輸出規(guī)律，掌握衛(wèi)星鐘性能，從而可以有效地判斷出原子鐘可能發(fā)生的異常。通過對異常情況的分析與歸類，實現(xiàn)衛(wèi)星鐘調(diào)鐘恢復后的快速鐘差預報，并在matlab環(huán)境下完成快速鐘差預報的具體算法。針對我國北斗系統(tǒng)，此算法可快速預報出衛(wèi)星鐘恢復后短時間內(nèi)的實時定位所需的衛(wèi)星鐘差。 本文所研究的預報算法針對的是衛(wèi)星鐘異常恢復后的快速鐘差預報，具體為：利用1小時數(shù)據(jù)分析建模，實現(xiàn)2小時鐘差預報，要求預報精度優(yōu)于2ns。通過對IGS鐘差數(shù)據(jù)的分析建立了周期線性模型，，并對其預報精度進行分析以確定算法可行性。最后將此快速鐘差預報算法應用于我國銣鐘，其預報精度較高，2小時預報精度平均為1.8ns。
[Abstract]:For modern satellite navigation systems, the close relationship between time and frequency and positioning is the most prominent. In satellite navigation systems, the positioning of user receivers depends on high precision spatial and time datum. The real-time positioning requires the use of high-precision satellite clock prediction parameters. In order to meet the high precision time synchronization, the satellite clock difference prediction has a significant impact on the positioning and timing of the navigation system. This paper focuses on the research of satellite time-frequency standard performance (satellite clock difference) prediction technology. By analyzing the prediction results of quadratic polynomial model, grey model and kalman model, the prediction results of satellite clock error prediction model are analyzed. The applicability and limitation of each model algorithm are put forward, and their models are compared. The possible anomalies of spaceborne clock, including FM, are analyzed emphatically. Phase modulation and clock switching. By analyzing the time-frequency characteristics of atomic clocks and studying the historical operating parameters, we can conclude the rules of signal output and master the performance of satellite clocks. Thus the possible anomalies of atomic clock can be effectively determined. By analyzing and classifying the abnormal conditions, the fast clock difference prediction after the recovery of satellite clock clock can be realized. This algorithm can be used to predict the satellite clock difference in a short time after the satellite clock recovers in the Beidou system of China, and the algorithm can be used to predict the satellite clock difference in a short period of time after the recovery of the satellite clock. The prediction algorithm studied in this paper is aimed at the fast clock error prediction after the abnormal recovery of satellite clock. In particular, the prediction of 2 small clock difference is realized by using 1 hour data analysis and modeling. The prediction accuracy is better than 2ns.The periodic linear model is established by analyzing the IGS clock difference data, and the prediction accuracy is analyzed to determine the feasibility of the algorithm. Finally, the fast clock error prediction algorithm is applied to rubidium clock in China. Its prediction accuracy is higher than that of 2-hour prediction, and the average prediction accuracy is 1.8 ns.
【學位授予單位】：西安電子科技大學
【學位級別】：碩士
【學位授予年份】：2013
【分類號】：P228

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