engleski

Examination of Site Suitability for GNSS Measurements

In order to make high-quality GNSS observations leading to reliable coordinates, especially on the stations that are intended to be used frequently or permanently, it is necessary that the location on which the observations will be taken fulfils certain criteria encompassing primarily the horizon without any obstacles, but also the absence of noise generated by the sources of electromagnetic radiation. The fulfilment of these criteria has been examined from the data taken during 24-hours long session of GNSS observations on the station located atop the tower of the Faculty of Mining, Geology and Petroleum Engineering (RGN) below which the antennas and the base station of mobile telecommunication provider are located. The observation data processing done with the TEQC software provided the information about Signal-to-Noise Ratio (SNR) and multipath both at L1 and L2 frequencies for signals of GPS and GLONASS satellites. Similarly, the observation data from the nearby CROPOS CORS ZAGR were processed and the comparison of results was presented. Based on GNSS observations taken on the RGN station along with the observation from CROPOS CORS stations KARL, SISA, ZABO and ZAGR, the baselines were processed, subsequently the network was adjusted and the coordinates accuracy estimation was given. Additionally, the apparent horizon around the RGN station was observed with the total station revealing that the sky is without obstacles above 10° elevation mask.

GNSS observations; horizon; multipath; Signal-to-Noise Ratio (SNR); TEQC

nije evidentirano