导航卫星时频标准性能预报研究

发布时间：2018-03-13 00:15

本文选题：钟差预报模型　切入点：异常情况　出处：《西安电子科技大学》2013年硕士论文　论文类型：学位论文

【摘要】：对于现代卫星导航系统而言，时间频率与定位的紧密关系表现得最为突出。在卫星导航系统中，用户接收机的定位依赖于高精度的空间基准和时间基准，而其实时定位需要使用高精度卫星钟预报参数。在满足高精度时间同步的前提下，卫星钟差预报对导航系统的定位和授时影响重大。本文着重于卫星时频标准性能（卫星钟差）预报技术的研究。通过分析卫星钟差预报模型中的二次多项式模型、灰色模型以及kalman预报模型的预报结果，提出各模型算法的适用性与局限性，并对其模型加以比对。重点分析了星载钟可能发生的异常情况，包括调频、调相与钟切换。通过对原子钟时频特性的分析与对历史运行参数的研究，可归纳出信号输出规律，掌握卫星钟性能，从而可以有效地判断出原子钟可能发生的异常。通过对异常情况的分析与归类，实现卫星钟调钟恢复后的快速钟差预报，并在matlab环境下完成快速钟差预报的具体算法。针对我国北斗系统，此算法可快速预报出卫星钟恢复后短时间内的实时定位所需的卫星钟差。本文所研究的预报算法针对的是卫星钟异常恢复后的快速钟差预报，具体为：利用1小时数据分析建模，实现2小时钟差预报，要求预报精度优于2ns。通过对IGS钟差数据的分析建立了周期线性模型，，并对其预报精度进行分析以确定算法可行性。最后将此快速钟差预报算法应用于我国铷钟，其预报精度较高，2小时预报精度平均为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.
【学位授予单位】：西安电子科技大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：P228

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