High Frequency GPS Kinematic Data Processing Method Of Multireference Stations And Its Application In Earthquake Deformation Monitoring

Since the 20th century,high-frequency GPS kinematic positioning theory and calculation methods have developed rapidly,there are more and more GPS receivers with high sampling rate(1HZ)and ultra-high sampling rate(10HZ or even higher 50HZ)have appeared,making the early GPS positioning technology which is mainly used to study long-period changes is gradually applied to objects with short-period changes or even instantaneous changes.High-frequency GPS kinematic positioning technology has also been used in researching earthquake deformation.Numerous domestic and foreign scholars have used high-frequency and ultra-high-frequency GPS data to prove that high-frequency GPS kinematic positioning technology can be used to researching earthquake deformation monitoring.Based on the traditional single reference station high-frequency GPS kinematic data processing method,this thesis studies the multi reference station high-frequency GPS kinematic data processing method based on the weighted average method.The weighted average method is compared with the track method in terms of the mean square error and the spatial coordinate value,which proves the feasibility of the weighted average method.On the basis of single reference station solving high frequency GPS kinematic data processing,multi reference stations with different attributes are added to solve the problem;After performing multi-reference stations solution,the accuracy of multi-reference stations relative to single reference station is analyzed.In the multi-reference stations high-frequency GPS kinematic positioning method,the influence of adding reference stations with different baseline lengths to the multi-reference stations solution is analyzed.The influence of adding a reference stations with a different height difference from the monitoring stations under the same baseline length on the solution of multiple reference stations is analyzed.The research results indicate that the processing accuracy of high-frequency GPS kinematic data of multiple reference stations is better than that of a single reference station.The accuracy of the reference station with a longer baseline added to the high-frequency GPS kinematic data of multiple reference stations is lower than that of a shorter one.The solution accuracy of the reference station of the baseline,the solution accuracy of the reference station with a larger height difference from the monitoring stations is lower than that of the reference station with a smaller height difference from the monitoring stations.The high-frequency GPS kinematic positioning method of multi-reference stations was verified by using the data from the Hong Kong CORS stations.After performing multi-reference station high frequency GPS dynamic data processing on the5 s sampling interval and 1s sampling interval data of the same monitoring station with an observation time of three hours at the CORS station in Hong Kong,the research results indicate that the coordinates of the monitoring station for the data of the 5s sampling interval and 1s sampling interval is little difference.The multi-reference stations high-frequency GPS kinematic data processing method was applied to the deformation research of earthquakes.The San Simeon earthquake in 2003 and the 3·11 earthquake in Japan in 2011 were analyzed,Using the multi-reference stations high-frequency GPS kinematic data processing method to solve the solution and the stations were selected to close to the earthquake center.The occurrence time of the two earthquakes was analyzed according to the changes of the coordinate data and the time series diagram.The displacement of the monitoring station in the NEU direction and the overall displacement of the monitoring station caused by the earthquake were calculated.