The performance requirements expected from space-based positioning are very high and currently with the launches of multi-GNSS, the positioning precision was greatly improved. However, the integrity of navigation system is more important than the precision. Thus, there is always a needs to authenticate and monitor the received signals to ensure the safety used of the space-based positioning in the country. The National Space Agency (ANGKASA) in collaboration with University Technology Malaysia (UTM) has developed the GNSS integrity monitoring system for space-based positioning in Malaysia. The purpose of the system is to continuously monitor the reliability and quality navigation information on GNSS and DGPS service in the country. During the development of the system, a new GNSS CORS network was established and it has been integrated with Malaysia Marine Department’s DGPS stations. This paper described the overall architecture and model-based design of the GNSS integrity monitoring system that consist of satellite system level, ground monitoring level and user DGPS level. Results from each level were analyzed for the assessment of the system performance. It is believed that the system will benefit to local GNSS user in various sectors.   

Keywords: GNSS, DGPS, integrity, monitoring