Research of Ionospheric Time-Delay Error Simulation in High Dynamic GPS Signal Simulator

The ionospheric time-delay is an important error source for GPS users. How to simulate the ionospheric error is one of the key problems that need to be solved in high dynamic GPS signal simulator design. The ionospheric effects are related to the user's position. Based on the analysis to the different ionospheric time-delay error correction methods for ground users and space users, the approaches to calculate the ionospheric time-delay error in a high dynamic GPS signal simulator are studied and the mathematic models are also given in this paper. The calculation problem of eight ionospheric coefficients broadcasted in a GPS satellite message in different application situations is solved. The validity of the ionospheric time-delay error calculation methods given by this paper has been proved by simulations.