THE VIRTUAL REFERENCE STATION CONCEPT IN FINLAND -A CASE STUDY

摘要

The quality and performance of the Virtual Reference Station (VRS) concept was studied in conditions that are typical of northern latitudes and Finland. The practical study consists of two major parts. The objective of the first part was to find the accuracy and initialization times and how they are affected by different factors. The factors that were studied are the baseline length, rover position within the network, number of satellites, satellite geometry, influence of obstructions and temporal variation of accuracy during the fixed solution. In the second part of the test the objective was to examine the influence of extended distances between reference stations in the VRS network (inter-station distances). The test was implemented by using two overlapping but differently configured VRS networks. Simultaneous observations from these networks were performed and results compared with each other. The second part also includes a study of network size in terms of the number of network stations.