Abstract:

The global navigation satellite system plays a more and more important role in navigation, so their reliability needs to be improved for the higher request. Two fault detection and diagnosis methods are studied based on receiver autonomous integrity monitoring (RAIM) algorithm for global position system (GPS)/global navigation satellite system (GIONASS) multimode satellite, and a fast fault reconstruction method is proposed in the condition that the least square solution is ineffective, which applies the correct results by resolving in the frontal time to forecast rapidly the navigation positioning information in current time. Based on real data from the multimode satellite receiver, the validation results indicate both the two methods diagnose the fault accurately and reconstruct the fault effectively. At the same time, it points out that the method is applied according to the application environment comparing the merits and demerits between them.