Research on Receiver Autonomous Integrity Monitoring in LEO satellites-augmented Compass

At present, the Chinese Compass navigation satellite system is under investigation and construction. The construction of Compass follows a step-by-step pattern based on technical and economic evolution in China, the current design is to cover Asia-Pacific area around 2012, and all over the world before 2020. Low Earth Orbit (LEO) satellite systems provide wide coverage for their data and/or voice services. The additional Compass compatible signals from LEO telecommunication satellites can remarkably improve the availability, accuracy and integrity of Compass positioning. This paper focuses on the Receiver Autonomous Integrity Monitoring (RAIM) performance of Compass augmentation using a proposed LEO satellite system. The Compass satellite system is briefly reviewed. RAIM algorithm is analyzed, in addition, the measurement equation in the joint Compass/LEO system is constructed. The RAIM performance is analyzed using the rates of fault detection and identification. The results show that the augmentation with LEO satellite system will improve the performance of RAIM.