Comparison of the precision of GNSS receivers with statistical tests

The choice of GNSS (Global Navigation Sattelite Systems) receivers to be used in high-precision research and engineering projects should have priority factor sensitivity. It is not correct to compare the sensitivities of measuring instruments according to the technical specifications of the manufacturers. In order to be able to objectively compare the precision of these instruments, the data obtained from the measurements under the same field conditions and under the same conditions should be compared with various statistical methods. In this study, a total of 16 GNSS receivers of four different companies were used. The application was made in Tuzla region and the triangulation points of Istanbul Metropolitan Municipality were used. Two triangulation networks, one with long sides and one with short sides, have been formed. The quadrilateral shaped network is formed from four points. Some common points is also used in two networks. Static measurement methods were used in the measurements and 4 separate GNSS receivers of each company were held in each and every four-hour sessions. The data obtained were processed in the adjustment program of each GNNS model and then the data is adjusted as tied and free network. Firstly, the adjustment results obtained from the process step were compared. However, since the comparison of the results of the different programs was not statistically correct, the data obtained from all of the GNSS instruments were converted to rinex format. All the data are adjusted only separately in a firm's adjustment software. After processing all the data are adjusted as tied and free network