Optimal GPS Positioning Solutions Interval for a Crustal Deformation Estimation

초록

GPS is an essential tool in positioning which requires high precision such as velocity field estimation of tectonic plates. However ittakes long time for this kind GPS solutions because of defective automatic GPS data processing system. Therefore, it is importantestimation. So, the Gipsy-Oasis II software was used to estimate daily deformation of GPS stations with orbital and atmosphericparameters and least square linear fitting technique was used to estimate the velocity of the GPS stations. In this relative solution ofdaily positioning, the standard deviation which is scale of precision turned out better than 4mm. In this study, to determine theoptimal time-interval for a crustal deformation estimation, three kinds of time-interval was adopted, which is 2-day, 5-day and 10-day time-interval and were compared to daily solutions by the standard deviation of velocity from the calculation results. Research results shows that the Std of the horizontal crustal motion parameter was 1.44 times (Std=?.66mm/yr), 2.24 times (Std=?.03mm/yr) and 3.20 times (Std=?.47mm/yr) worse than the Std used to obtain of the daily positioning result (Std=?.46mm/yr). The crustal motion magnitude varied irregularly for the 2-day interval. So, we made conclusion that the 2-day interval can be applied to process GPS data for rapid velocity field estimation.

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