Adjustment of GNSS Permanent Stations Network MOLDPOS

The aim of this work is to analyze the GNSS measurements results at different periods of time in order to estimate the accuracy of GNSS network monitoring in Republic of Moldova and to describe the national position system MOLDPOS.The goals of this paper are: the analyze of position systems; analyze of GNSS bases processing methods; the study of GNSS measures processing software and the adjustment of permanent stations network and the comparative analysis of the results.The most important part of the work was achieved by using Leica Geo Office Software that allowed to calculate the GNSS permanent stations coordinates for 4 different periods of time with the help of which was possible to determinate the smallest average deviation from initial coordinates andto determinate the average square error both in altitude and plan, in this way it's possible to find out which accuracy is the best from all periods of time.The achievements of this paper are:for 30 minutes with ±1 cm in plan and ±2.6 cm for altitude and is the best accuracy and the rest of the results are represented in the next way:-24 hours: in plan : ±0.9 cm and for altitude is ±3.4 cm;-60 minutes: in plan: ±1 cm and for altitude is ±2.7 cm;-15 minutes: in plan: ±1.6 cm and for altitude is ±3.5 cm;