海潮负荷对山东地区GPS高精度测量的影响研究

发布时间：2018-06-04 06:35

本文选题：海潮负荷 + 小波多分辨率分析　；参考：《山东理工大学》2015年硕士论文

【摘要】：随着GPS等空间技术的快速发展,GPS在地球物理和大地测量学等领域得到了广泛的应用,高精度的观测技术越来越受到重视。海洋潮汐是由于太阳和月球等天体的引力作用而产生的周期性运动,对高精度测量产生的影响不容忽视。本文基于山东CORS站,研究了海潮负荷对山东地区GPS测站位移和GPS基线的高精度测量的影响,分析了不同海潮模型在山东地区的差异性,并用不同观测时间周期的数据研究海潮负荷的影响,同时还通过Fourier谱分析和小波多分辨率理论,分析了海潮负荷的特征信号的规律。具体的研究内容如下:(1)以山东CORS基准站数据为基础,计算了海潮负荷对山东地区GPS高精度测量的影响。结果表明,海潮负荷对山东沿海GPS测站的位移影响量可达到厘米级,最大达到2.4cm;海潮负荷对山东内陆测站的影响远小于沿海测站,山东沿海测站所受的影响是山东内陆测站的2-3倍。海潮负荷对GPS测站的影响在垂直方向最大,远大于东西方向和南北方向,是东西方向和南北方向的2-3倍。(2)分析了海潮对以山东CORS站构建的GPS基线的影响。结果得知,海潮负荷对山东地区GPS基线的影响一般为毫米级,相对影响在10-8-10-9之间,海潮负荷对GPS基线的影响主要与基线长短和测站的位置有关。(3)以NAO99b、FES2004和CSR4.0三种海潮模型为例,研究了海潮模型对GPS高精度测量影响的差异性。得出三种海潮模型对山东地区的GPS测量的影响具有相同量级,其中NAO99b海潮模型对山东沿海GPS测站的改正值较大,FES2004模型和CSR4.0模型对测站影响差异很小,在山东内陆测站,三种模型相差不大。(4)利用不同观测周期的数据计算海潮负荷的影响。结果表明,对于连续观测时间较长的测站来说,海潮负荷对测站坐标的影响较小,但是对于GPS短周期精密测量来说,海潮负荷位移改正对山东地区GPS测站影响较大。在短周期高精度测量中必须考虑海潮负荷的影响。(5)通过Fourier谱对山东CORS站海潮负荷影响进行分析,从一个月的数据分析来看,半月潮能量最大,周期较明显。利用小波多分辨率理论对特征信号进行提取,分析了半月潮波的振幅影响。
[Abstract]:With the rapid development of space technology such as GPS, GPS has been widely used in geophysics and geodesy, and high precision observation technology has been paid more and more attention. Ocean tides are periodic motions caused by the gravitational action of the sun and moon and so on. The influence of ocean tides on high precision measurements can not be ignored. Based on Shandong CORS station, this paper studies the influence of tidal load on the displacement of GPS station and the high precision measurement of GPS baseline in Shandong, and analyzes the differences of different tidal models in Shandong. At the same time, the influence of sea tide load is studied by using the data of different observation time periods. At the same time, the law of characteristic signal of ocean tide load is analyzed by Fourier spectrum analysis and wavelet multi-resolution theory. The specific research contents are as follows: (1) based on the data of Shandong CORS datum station, the influence of sea tide load on the high precision measurement of GPS in Shandong area is calculated. The results show that the influence of sea tide load on the displacement of Shandong coastal GPS station can reach centimeter level, the maximum is 2.4 cm, and the influence of sea tide load on Shandong inland station is much smaller than that of coastal station. The influence of Shandong coastal stations is 2-3 times of that of Shandong inland stations. The influence of sea tide load on GPS station is the largest in vertical direction, much larger than that in east-west direction and north-south direction, and is 2-3 times of east-west direction and north-south direction.) the influence of sea tide on GPS baseline constructed by Shandong CORS station is analyzed. The results show that the influence of tidal load on GPS baseline in Shandong region is generally in millimeter order, and the relative influence is between 10-8-10-9. The influence of tidal load on GPS baseline is mainly related to the length of baseline and the location of station.) the three tidal models, NAO99b / FES2004 and CSR4.0, are taken as examples. The difference of the effect of tidal model on GPS high precision survey is studied. It is concluded that the influence of the three tidal models on the GPS survey in Shandong is of the same order of magnitude. The difference between the NAO99b tidal model and the CSR4.0 model for the GPS stations along the coast of Shandong is very small, and the difference is small in the inland stations in Shandong Province. The three models have little difference.) the influence of tidal load is calculated by using the data of different observation periods. The results show that for the stations with longer continuous observation time, the effect of sea tide load on the coordinate of the station is small, but for the GPS short period precision measurement, the correction of ocean tide load displacement has a great influence on the GPS station in Shandong area. In short period high precision survey, the influence of tidal load must be considered. (5) the influence of sea tide load at CORS station in Shandong province must be analyzed by Fourier spectrum. According to the analysis of one month's data, the semilunar tide energy is the largest and the period is obvious. Wavelet multi-resolution theory is used to extract the feature signal and the amplitude effect of half-moon tidal wave is analyzed.
【学位授予单位】：山东理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：P228.4

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