Study on Influence of Orbital Perturbation on the Visibility of GNSS Satellite System

The influence of orbital disturbance on satellite visibility is analysed in view of the phenomenon that the orbital data is effected by the perturbbative force. With STK(Satellite Toolkit), the software of simulation of orbit, the orbit is researched from simulation using TowBoday J2 J4 and HPOP. Choosing Tow Boday J2 and HPOP, the software generate a report that analysis visibility of satellite constellation from ground measurement and control station. The simulation results show that satellitic orbit is effected by perturbation force. The orbit elements computed by perturbative orbit equation is accuracy. As it is more accurate, in HPOP model, the maximum error is 0.076°in latitude and 0.115°in longitude. In altitude, the maximum error is 3.226 km. The disturbances of satellitic orbit can influence visibility of satellite which work out the maximum error was 9.913 s.