Study on the relationship between observing-time period and precision of GPS fast-static positioning in micro-network of control with single-frequency and dual-frequency receivers

摘要

The technology of GPS fast-static positioning has been widely used in various engineering fields such as geodynamical research, crust deformation monitoring in large-scale, landslip and land subsidence. In view of the measurements' past-processing fashion, the precision can't be assessed on time outdoors. Therefore, it has been hot-debated to determine the shortest time needed in the fast-static positioning with the single-frequency or dual-frequency receivers. In this article, a micro-network of control was established and some experiments were done with the two kinds of equipments respectively. According to the relation between precision and observing time, the graph of the two indexes can be drawn, and then the most effective observing-time can be attained. By compare of the results, it can be found that the observation accuracy of dual-frequency receivers is distinctly higher than that of single-frequency ones. In addition, there exists an obvious inflexion in each relation graph. Namely, the time to acquire steady accuracy is different from each other. The shortest positioning time of the single-frequency GPS is 20 minutes while that of dual-frequency one is 15 minutes.