The Study of RAIM Performance by Simulation

1 Introduction Global Positioning System (GPS) is a satellite based navigation system. One concern of GPS users is system integrity, which is the ability of the system to provide timely warnings to users when the system should not be used for navigation. GPS integrity is very important in civil aviation in order to guarantee the flight safety. RAIM is a technique used to provide a measure of the trust which can be placed in the correctness of the information supplied by the total system…

The Study of RAIM Performance by Simulation

Receiver Autonomous Integrity Monitoring (RAIM) is a software algorithm available in some GPS receivers which gives an indication if the position solution given by the GPS receiver is suitable to use. The detail algorithm of the parity space method of RAIM technique is presented. Using FDI and FDE methods, the simulations of RAIM performance have been done in three different phases independently with respect to the bias of the fault satellite. Case study of simulation results is discussed and each performance of RAIM is analyzed. According to the analysis of simulation results, the parity space method of RAIM can meet the integrity requirements for nonprecision, terminal and enroute flight phase. It also indicates that the results of performance of FDE are better than that of FDI.