Análise do processamento e ajustamento de dados GPS para linhas de base curtas e longas

Among the methods used for GPS surveys, the fast static relative positioning detaches because of its high productivity. However, according to INCRA Technical Standard, its necessary that the maximum distance between the reference station and the station whose coordinates need to be determined be of 20km. In order to verify the errors from the baseline length, 14 stations of the local GNSS lan, located in Federal University of Uberlândia, Santa Mônica campus, were surveyed with GPS receivers of single frequency (L1). Then, it was held the processing and adjustment of the datas in the software Topcon Tools, version 8.2. This step was carried out three times, just changing the reference station. Initially, it was decided to choose stations that formed short baselines with the rovers: MGUB and UBER. After, to analyze the degradation of the results due to the increase of the vectors between the stations, was chosen MGMC as the base reference. All these stations belong to the brazilian network of continuos monitoring and its datas are provided by IBGE. From this experiment, it was possible to verify that the precision of the results vary considerably by varying the lengths of the baseline. So, its important that the station took as reference be near to the points whose positions are desired, thereby increasing the accuracy of the results.Pages: 4684-469