基于相对论效应的GPS卫星钟差预报模型研究

发布时间：2018-02-27 13:01

本文关键词： GPS 钟差病态钟差二次多项式模型灰色系统模型相对论钟慢效应引力时间膨胀　出处：《昆明理工大学》2015年硕士论文　论文类型：学位论文

【摘要】：GNSS(全球卫星导航系统)技术现今已广泛应用于测量技术应用的各个领域,其中的GPS系统由于研发早,技术成熟,成为应用最为广泛的技术。GPS测量中不可避免的含有各类误差,其中相对论效应误差可由模型化进行相当程度的扣除。精密单点定位技术(precise point positioning,PPP)是GPS测量技术的发展趋势,在轨道预报技术已满足要求后,高精度的钟差预报已成精密单点定位技术发展的一大限制。现行GPS的钟差预报模型有二次多项式模型、灰色系统模型等,这些模型都是在钟差数据本身的分析基础上建立的。另外,现行相对论效应钟差的改正存在一定缺陷,改正后仍有残差归于卫星的钟差当中,所以本论文在相对论时间效应残差的产生机制上展开,构建出一个与二次多项式模型、灰色系统模型的建立基础不同的预报模型。而后,挑选出的具有足够精度且钟差特征各不相同的三颗卫星的IGS事后SP3精密星历为数据基础,利用Matlab编写程序进行三个模型的计算,做出为期15天的预报,并将结果作对比。最终,本论文得到以下结论：在所选三颗卫星钟差预报时长为15天的中短期预报中,基于相对论效应的钟差预报模型预报精度高于灰色系统模型,抗病态钟差能力远高于二次多项式模型,证明了对于所选三颗卫星预报时长为15天的钟差预报,基于相对论效应的钟差预报模型可行。
[Abstract]:Nowadays, GNSS (Global Satellite Navigation system) technology has been widely used in various fields of measurement technology, among which, GPS system has become the most widely used technology, because of its early development and mature technology, it inevitably contains various kinds of errors. The relativistic effect error can be deducted by modeling. Precise single point positioning technique is the development trend of GPS measurement technology. High precision clock error prediction has become a major limitation of the development of precision single point positioning technology. The current GPS clock error prediction model includes quadratic polynomial model, grey system model, etc. These models are all built on the basis of the analysis of the clock error data itself. In addition, there are some defects in the correction of the current relativistic effect clock errors, after which the residual errors are still attributed to the satellite clock errors. Therefore, in this paper, the mechanism of the relativistic time effect residuals is expanded, and a prediction model is constructed, which is different from the quadratic polynomial model and the grey system model. The IGS hind SP3 precise ephemeris selected from three satellites with enough precision and different clock difference characteristics is used as the data basis. The calculation of the three models is carried out by using the Matlab program, and the forecast lasts 15 days, and the results are compared. In this paper, the following conclusions are drawn: in the medium and short term prediction of the clock difference of the three selected satellites for 15 days, the prediction accuracy of the clock difference prediction model based on relativistic effect is higher than that of the grey system model. The anti-morbid clock error is much higher than the quadratic polynomial model. It is proved that the clock error prediction model based on relativistic effect is feasible for the prediction of the clock difference of the three selected satellites with a duration of 15 days.
【学位授予单位】：昆明理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P228.4

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