On December 23th, 2014, the International GNSS monitoring and evaluation system development and construction (the first stage) acceptance summary conference was held in Beijing. About 10 academicians, including Sun Jiadong, Shen Rong Jun, Li Jisheng, Wei Ziqing, Yangyuan Xi, Xu Houze, Wan Weixing, Li Tianren, Liu Jingnan and Fan Benyao, and more than 100 representatives from 30 unites of domestic universities, research institutes, industrial sectors attended the meeting.
The International GNSS monitoring and evaluation system development and construction (the first stage) acceptance report was made during the conference. A live demonstration of system operation was made. Through the in-depth discussion with experts, it was fully agreed to pass the acceptance review, which indicated the completion of the first phase of system construction.
It is reported that the International GNSS monitoring and evaluation system, abbreviated as iGMAS, was constituted by around ten tracking stations and nearly 20 research centers including data centers, analysis centers, monitoring and evaluation centers, integrated product and service centers, operational control and management centers, etc. It is the world’s first GNSS integrated monitoring and evaluation service platform covering GPS, GLONASS, BDS and Galileo. It is able to provide 33 different monitoring and evaluation information service of 4 types, including GNSS system constellation status, space signal accuracy, spatial signal quality, service performance and so on. It could also provide 8 basic services, such as GNSS system orbit, clock error, tropospheric parameters, ionospheric parameters, geocentric coordinates and earth rotation parameters. It could also provide first-hand data services from around 100 tracking stations in China and abroad. Now the services have been used in lunar exploration project, mapping and other industries.
The system firstly proposed the international GNSS monitoring and evaluation concept, developed the four system all-band GNSS high accuracy measurement receivers, constructed system basic structures and provide initial operational service, realized GNSS multi-system data fusion, and was highly regarded by experts in China and abroad.
At the meeting, China Satellite Navigation System Management Office (CSNO) signed the long-term operation and maintenance agreements with other the research centers and tracking stations, and held a ceremony for it.
The experts said, with the global satellite navigation system into the era of multi-GNSS, the compatibility and interoperability of different system would become a trend. International GNSS monitoring and evaluation system at one hand can conduct system openness service performance evaluation; on the other hand can also promote compatibility and interoperability for systems. All these work will undoubtedly boost the sustainable development of GNSS, and has meaning in enhancing overall system performance.
It is said that China has proposed the initiative of international GNSS open service monitoring and evaluation to ICG in 2011. The proposal of setting up sub-IGMA work group was passed. The international GNSS monitoring and evaluation work, which China played an important role in, has become one of the action plans of ICG. Now, with the first stage work completed, the system will provide service for global users, and thus enhance the safety and reliability of GNSS users.