EFFECT OF IGS BASELINE LENGTH ON GNSS POSITIONING ACCURACY

Since the establishment of International GNSS Service (IGS) stations, they have been used as control stations for assigning Precise point positioning (PPP) positions using one Global Navigation Satellite System (GNSS) receiver, which has increased from day-to-day. There are some factors affecting accuracy PPP positioning. This research aims to investigate relation between IGS distance and observed field points well attempt describe that mathematically/statically. For realization aim, two fixed inside Assiut University campus successively a session 24 hour observation. The position each is assigned with help available station products. It must be known these products found after observations in three files (IGU, IGR, final IGS), whereas IGU directly real-time data (ultra-rapid), IGR (rapid) through (17-41 hours) observation, (final IGS) 12 – 18 days. Coordinates errors computed represented. positive distances. distances represented described according model. presented model (R ≅ .98, x2 2.5 × 10-3).