Monitoring and assessment of GNSS Open Services can bring much benefit to the healthy development of GNSS. It can not only extend the depth and breadth of GNSS applications, but also provide the foundation for all kinds of civil users to use system services safely and reliably. There is sufficient evidence to show that the iGMAS proposed in this paper is technically feasible. For example, the preliminary exploration of BeiDou in its open services monitoring and assessment, the long-term successful operation of IGS, and achievements in navigation signal monitoring and assessment made by Stanford University and DLR, etc. However, the construction of iGMAS is a global and long-term work, and it needs more organizations and countries to be involved. So it is very necessary to implement international cooperation.
DOD (U.S. Department of Defense). 2008. Global Positioning System Standard Positioning Service Performance Standard. Available online at http://pnt.gov/public/docs/2008/spsps2008.pdf.
Hegarty, C.J., and J.T. Ross. 2010. Initial Results on Nominal GPS L5 Signal Quality. Pp. 935–942 in Proceedings of the 23rd International Technical Meeting of the Satellite Division of the Institute of Navigation (ION GNSS 2010), Portland, Oregon, September 2010.
Lu, X.C., and H.W. Zhou. 2010. Methods of analysis for GNSS signal quality (in Chinese). Scientia Sinica Physics Mechanics and Astronomy 40(5): 528–533.
Stanton, B.J., and R. Strother. 2007. Analysis of GPS Monitor Station Outages. Pp. 176–183 in Proceedings of the 20th International Technical Meeting of the Satellite Division of the Institute of Navigation (ION GNSS 2007), Fort Worth, Texas, September 2007.
Yang, Y.X. 2010. Progress, contribution and challenges of Compass/BeiDou satellite navigation system (in Chinese). Acta Geodaetica et Cartographica Sinica 39(1): 1–6.