APPLICATION OF SBAS PSEUDORANGE AND CARRIER PHASE SIGNALS TO PRECISE INSTANTANEOUS SINGLE-FREQUENCY POSITIONING

摘要

This research evaluates the potential benefits of the tightly combined processing of a global navigation satellite system together with the additional ranging observations from a satellite based augmentation system. In specific, the experiment presents performance of precise instantaneous single-frequency positioning based on European Galileo and EGNOS navigation systems. Due to currently low number of Galileo satellites, the test observational data were obtained with hardware GNSS signal simulator. All calculations were performed with in-house developed software - GINPOS. The results show that it is possible to obtain improvement in the accuracy and reliability of single-frequency precise positioning when including observations from SBAS systems. However, one must lake into account that at middle latitudes EGNOS satellites are observed at low elevations what results in higher atmospheric errors affecting its signals.