Summary:

The paper presents the results of the tests, which aim was to analyze the elevation angle impact on the size of obtained output during the RTN measurements with Polish commercials reference stations TPI NETpro and VRSNet. Reference station access were used in experiment. That stations were done continuous, real time observations of the satellite signals from the GPS and GLONASS systems and they are ready to Galileo signals measurements. There are multiple, five seconds RTN observations in the paper, measured on four selected points in the area of the Centre of Innovation-Deployment New Technique and Technology in Ecological Engineering University of Life and Science in Lublin. Measured points were characterized by different degree of elevation angle: without any obstacles in nearest area, with obstacles in south-east side, with obstacles in north, south and east side and with obstruction in North side and partly obstacles south side. Observations were made in a couple of measurement series with elevation angles from 0 to 30 degrees. Afterwards results analysis were made for example: the amount of visible satellites of GPS and GLONASS system in the time of measurement and dilution of precision coefficient PDOP values. Received values of coordinates, RMS2D and RMS1D biases were also analyzed. To compute the position of receiver, RTK FIXED solution were used, which allows us to calculate the current coordinates in differential measurement by using the pseudo range and carrier phase measurements and requires the ambiguity resolution to perform the measurements.