| One of the most interesting applications of Global positioning System (GPS) is the Real-Time Kinematic system. This technique emerged in the beginning of the 1990's and offers centimeter to millimeter precision to the GPS users, using carrier phase measurements and a reference GPS station. It has been successfully applied in geophysics and survey. Unfortunately, such RTK system is only precise in short range from the base station, that is to say less than about 20 km. When the distance from the base station increases, systematic errors reduce the ambiguity resolution success rate and decrease position precision. The purpose of this thesis is to overcome these limitations to bring full RTK precision and reliability for long baseline scenarios, up to 80 km. To do so, a RTK software has been developed, as well as innovative technique, to demonstrate the RTK precision in short and long baseline distance.;Keyword: GPS, RTK, ambiguity, long baseline, Kalman filter. |
