Study On High-rate GPS Data Precise Processing And Its Application On The Earthquake

Because of the great potential of high frequency GPS technology can obtain the crustalmovement of the instantaneous. Therefore, expanding the application of crustal movementobservation network timely, carry out processing and analysis of high frequency GPSobservation data, study on dynamic change of pre earthquake, coseismic and postseismic, soas to expand the application of GPS in earthquake research is the reality demand at presentvery urgent.In the earthquake, a stable reference station selection more difficult by dynamicdifferential mode for dynamic positioning; it will produce the same shock phenomenon,which can not reflect the accurate displacement measurement station. PPP positioning relativeto the differential positioning, without base stations, and the positioning result directly reflectsthe position changes, is an effective method to monitor the instantaneous crustal movement.These two methods have advantages and disadvantages, effects need further eliminate thesystematic errors in the positioning results and multipath effect error to improve thepositioning precision positioning results, obtained better to meet the needs of high precisionpositioning.The main research content of this paper is that in-depth study of dynamic differentialpositioning method and the precise point positioning of the original principle, characteristicsand calculation process; on the error encountered during the processing of data and thecorresponding error model research; besides through many practices, we found that when amultipath data quality size effect of precision of the difference is the influences on positioningwill be bigger, should choose the multipath effect data processing, at the same time whenprocessing node is obtained using the time interval smaller clock difference when thedocument the result will be more precise. To reduce the multipath effect and the system erroris not modeled using a sidereal day filtering and spatial filtering worse, the data processingresult is more reliable, through the processing of real seismic data can be found, set the accuracy was improved. Order a set of high frequency GPS data more complete processing ofseismic data process, the data processing flow is applied to Japan3.11earthquake, from theanalysis of data quality, reference station selection, parameter model of the choice to use thefilter method, the PPP and dynamic difference two positioning method, and then the resultswere analyzed, found that the high frequency GPS data processing is relatively reliable, butalso strong evidence that the details of the consideration is necessary, through the process ofsingle point positioning results consistent with the dynamic differential positioning results ofgood accuracy, basically equivalent.