High Frequency GNSS Positioning Technology And Its Application Research On Seismic Inversion

China is a one of country with serious earthquake disasters. With the rapid development of GNSS technology, its application and openness degree makes a spurt of progress. It has become a very urgent and meaningful work that using this technology into instantaneous coseismic deformation information extraction, analysis and the inversion of seismic correlation factor. And our country's CMONOC network and other countries'CORS network provides amount of high frequency GNSS observation data for earthquake research. Then the GNSS data processing of high quality and reliable has become a decisive condition of GNSS earthquake research. In this paper, it use non-difference network solution module of PANDA software epoch by epoch for dynamic positioning. GNSS stations of the instantaneous coseismic deformation information of Wenchuan earthquake and Japan 311 earthquake is recovered and determined the seismic wave arrival time of each station, inversed the epicenter and earthquake time. The main research work and conclusions of the paper include:1. Analysis advantages and disadvantages of PPP, double difference network solution, on-difference network solution, finally take a method of non-difference network solution to deal with the high frequency of GNSS data considering the actual earthquake, and make a deep research on non-difference network solution algorithm.2. In the process of relative localization, if the base station receives are influenced by seismic wave, it can generate coseismic displacement with monitoring station, which makes the calculation result not true. In order to avoid this drawback, mean gap method of benchmark network stability analysis method is adopted into non-difference network solution dynamic positioning epoch by epoch, which realizes the stability maintenance of reference network in the course of earthquake data processing.3. The paper studies the sidereal day filtering method, the positioning results of an example NEU three directions in the timing of RMS dispersion were decreased, and the accuracy is obviously improved. It validated the sidereal day filtering method can effectively weaken the system error of the GNSS stations and satellite orbit caused by environmental.4. It uses the 1Hz GNSS earthquake observation data recovered Wenchuan earthquake and Japan 311 GNSS earthquake observation station of the instantaneous coseismic deformation information. With analysis, it shows that when seismic amplitude is small?the instantaneous vertical coseismic deformation information will be submerged in the error noise. Seismic vibration amplitude is complete with not only epicentral distance related but also its direction of fault zone.5. The paper studied the seismic wave arrival time determination method and the epicenter and inversion method of earthquake time. Based on the Wenchuan earthquake and the Japan 311 earthquake as an example, it obtains the seismic wave of each GNSS observation station time and epicentral location, earthquake moment and compared with the results of China Earthquake Administration and Japan GEO organization released, the results shows inversion error is as follow:epicenter location is 12.5km and earthquake time is 6s for Wenchuan earthquake, and epicenter location is 26.3km and earthquake time is 4s for Japan 311 earthquake.