地震过程GPS动态精密解算与拟合分析

发布时间：2018-08-07 14:12

【摘要】：动态精密解算主要是在地震等连续运动平台上的应用研究,但目前还没有一个标准来确定所能达到的精度,通过地震模拟实验,可以对动态精密相对定位进行精度评价。地震威胁着人们的生产生活及生命安全,特别对处于地震带地区的科研来说,研究地震有着极为重要的意义。利用GAMIT精密解算数百公里的长基线以北京、武汉、乌鲁木齐三个长期监测期测站为例,得到最长为2020km的基线解算偏差值为1.09cm。利用参数已知的轨道进行动态模拟实验,设置采样率为1Hz,采用GAMIT软件中的Track模块,分析不同距离的基准站数据,得到运动轨迹示意图,实验数据分析表明:在水平位移上和垂直方向上,精度都可以达到了毫米级,此精度完全可以在地震发生时来分析地震带来的位移变化。其次,以实验所采用的方法对2003年美国西海岸圣西门发生的6.9级地震震中周边GPS接收站的高频数据,进行解算分析,得到该地震发生时刻的横波传播速度约为3.3km/s,得到结果在地震横波的速度范围内。从理论入手,结合设计的地震模拟动态实验平台进行了实验,并利用GAMIT软件中的Track模块进行数据分析,对GPS数据进行了精密处理。通过地震模拟实验对动态定位精度做出评定,可以有效的填补对动态定位精度标准的空缺,为动态精密解算做出了贡献。
[Abstract]:The dynamic precision solution is mainly applied to the continuous motion platform such as earthquake, but there is not a standard to determine the accuracy that can be achieved. Through the seismic simulation experiment, the accuracy of dynamic precision relative positioning can be evaluated. Earthquake threatens people's production, life and safety, especially for the scientific research in seismic zone, the study of earthquake is of great significance. Using GAMIT to calculate hundreds of kilometers of long baselines, taking Beijing, Wuhan and Urumqi as examples, the results show that the deviation value of 2020km is 1.09 cm. The dynamic simulation experiment is carried out by using track with known parameters, and the sampling rate is set to 1Hz. By using the Track module in GAMIT software, the datum data of different distances are analyzed, and the motion track diagram is obtained. The analysis of experimental data shows that the accuracy can reach millimeter both in horizontal displacement and vertical direction. This precision can be used to analyze the displacement change caused by earthquake when the earthquake occurs. Secondly, the high frequency data of the GPS receiving station around the epicenter of the Saint-Simon earthquake occurred on the west coast of the United States in 2003 were calculated and analyzed by the method used in the experiment. The velocity of shear wave propagation at the time of occurrence of the earthquake is about 3.3 km / s, and the result is within the velocity range of seismic shear wave. Based on the theory, the experiment is carried out with the designed dynamic experimental platform of earthquake simulation, and the data of GPS is analyzed by using the Track module in GAMIT software, and the precise processing of GPS data is carried out. The evaluation of dynamic positioning accuracy by seismic simulation experiment can effectively fill the gap of dynamic positioning accuracy standard and contribute to the dynamic precision calculation.
【学位授予单位】：华北理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：P228.4;P315.7

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