GPS technology and seismic monitoring earthquake

As the actual observation points to the distance between the satellite, due to measure the instantaneous satellite clock and receiver clock synchronization is difficult to maintain strict, which contains a clock error of the distance, known as "pseudo-range." Which can be applied to the navigation satellite clock error message given in the clock error parameters to be corrected, and the receiver clock error can not know in advance, so be it as an unknown and three-dimensional coordinates of observation points along the data processing solution, so a observation point to solve the four unknowns in real time, that is, at least the same

Observed when 4 satellites. 

* Relative positioning method is to use two GPS receivers were placed at both ends of the baseline, and synchronize the same GPS satellite observations, to establish a baseline in the earth's relative position coordinates or baseline vector. Because in two or more same observation point simultaneous observation satellite, which can effectively eliminate or reduce the orbit error, satellite clock error, receiver clock and poor impact. Monitoring of crustal movement at present is static relative positioning using this method, its accuracy is up to 10-8 ~ 10-9 . 

Second, GPS technology for monitoring seismic and crustal movement of 

GPS technology is very broad. In recent years, GPS in the determination of earth rotation parameters from the improved time resolution observations to improve steering precision, it is compared with the VLBI or SLR, have an immeasurable effect. GPS in Earth with space-time reference system to establish the role of encryption and improve the resolution, GPS global data are relative to the global scale Earth three-dimensional geocentric coordinate reference frame has