基于GPS的主要分潮特征研究

发布时间：2018-07-10 11:06

本文选题：GPS + 频谱分析　；参考：《中国石油大学(华东)》2015年硕士论文

【摘要】：GPS定位技术与其他学科间的交叉与融合,不但极大扩展了GPS的应用领域,更为其他学科的发展提供了新的方法和机遇。通过分析GPS定位结果中的海潮负荷影响,进而开展海洋潮汐特征相关研究,是GPS与潮汐科学交叉结合的新兴研究热点之一,具有丰富的科学和实践价值。本文使用GAMIT软件对我国沿海四个测站的GPS观测数据进行了处理。处理时采用四种处理策略,即静态处理时采用1小时和3小时两种时间窗口,静态模拟动态处理时采用IGS和IGR两种不同星历,获取测站位移时间序列。以此为基础,采取频谱分析的方法提取8个主要分潮的特征参数,并与现有海潮模型和PPP反演成果进行对比分析。结果表明:(1)海潮负荷效应会对研究区域产生厘米级影响,且各全球海潮模型对同一区域海潮特征的描述不尽相同;(2)基于GPS方法反演海潮特征在理论和实践中都是可行的,将反演得到的特征参数应用于海潮负荷改正,会使GPS定位结果更加稳定、准确;(3)良好的GPS定位精度和较高的数据采样率更有利于分潮特征的反演,1小时数据处理周期反演出的分潮数量多于3小时数据处理周期反演出的分潮数量,但其反演结果受到的GPS残差影响更大;(4)卫星轨道精度对K2、K1分潮的反演有较大影响,使用IGS星历反演的K2、K1三方向振幅值与海潮模型的互差比IGR反演结果的互差值减小3-10mm不等;(5)在相同研究区域,PPP反演结果与差分反演结果具有良好的一致性,但PPP结果更有利于分潮信号的区分和提取。
[Abstract]:The intersection and integration of GPS positioning technology and other disciplines not only greatly expand the application of GPS, but also provide new methods and opportunities for the development of other disciplines. By analyzing the influence of ocean tide load in the GPS positioning results and then carrying out the research on the correlation of ocean tidal characteristics, it is one of the new research hotspots which combines GPS with tidal science, and has rich scientific and practical value. In this paper, Gamit software is used to process GPS data from four stations along the coast of China. Four processing strategies are adopted, namely, 1 hour and 3 hour time windows are used in static processing, and IGS and IGR are used in static dynamic processing to obtain displacement time series. On this basis, the characteristic parameters of eight main tidal components are extracted by spectrum analysis, and compared with the existing tidal model and PPP inversion results. The results show that: (1) the tidal load effect will have a centimeter effect on the study area, and the global tidal models have different descriptions of the tidal characteristics of the same region; (2) the inversion of the tidal characteristics based on the GPS method is feasible in both theory and practice. Applying the inversion characteristic parameters to ocean tide load correction will make the GPS positioning results more stable. (3) good GPS positioning accuracy and high data sampling rate are more favorable to the inversion of the tidal characteristics in the one-hour data processing cycle than in the 3-hour data processing cycle. However, the GPS residual error of the inversion results is more significant. (4) the accuracy of satellite orbit has great influence on the inversion of K2K1 tidal component. The three-direction amplitude value of K _ 2N _ K _ 1 inversion using IGS ephemeris is less than that of 3-10mm in the sea tide model. (5) in the same study area, the inversion results are in good agreement with the difference inversion results. But the results of PPP are more favorable to the differentiation and extraction of tidal signal.
【学位授予单位】：中国石油大学(华东)
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P228.4;P731.23

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