Ways of GLONASS System Advancing

Nicolay Ivanov, Vadim Salischev, and Alexander Vinogradov

Abstract:	Currently,the GLONASS system is in its final phase of full deployment. As it was declared earlier, full deployment of the system consisting of 24 satellites would be finished by the end of 1995. It is known, that frequency band of the GLONASS navigation signals overlaps with the band used by the Radio Astronomy. In order to avoid interferences in the Radio Astronomy band, the plan have been developed and is implemented now for gradual changing of the GLONASS navigation frequency bandwidths. In order to improve navigation accuracy for civil users, the modernization of the navigation L2-signal is undertaken. Modernized GLONASS-M satellites will broadcast L2-signals destined as for military as for civil use. This will allow civil users to exclude automatically that portion of measurement error caused by the ionospheric refraction. One of the most important tasks linked with the full system’s deployment is a task of integrity maintenance. For the sake of this task, creation of additional GLONASS integrity monitoring stations will be started on the territory of Russia in 1995. These stations will be linked into a single network with an internal information exchange, allowing fast detection and uploading aboard the satellites information on possible degradation of navigation signal’s quality. These monitoring station will at the same time serve as differential stations and will form the wide area differential network. The monitoring station will be based upon the 16-channel combined GLONASUGPS receivers, allowing to monitor integrity and form differential corrections for satellites of both GLONASS and GPS systems. Combined usage of the GLONASS and GPS systems in near terms should become the real factor improving reliability and availability of navigation for civil users. Analysis made on similar and different features of both systems confirms existence of two aspects requiring mutual discussions and further cooperation between the Russian and the US specialists. These aspects are differences in time scales and coordinate systems adopted in the GLONASS and GPS. Russian specialists are ready for cooperation in this area and intended to broadcast the time scale difference within the GLONASS navigation message. However, the divergence between the GLONASS and GPS coordinate systems can be determined most accurately and reliably by means of mutual efforts of the Russian and US specialists.
Published in:	Proceedings of the 8th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1995) September 12 - 15, 1995 Palm Springs, CA
Pages:	991 - 1011
Cite this article:	Ivanov, Nicolay, Salischev, Vadim, Vinogradov, Alexander, "Ways of GLONASS System Advancing," Proceedings of the 8th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GPS 1995), Palm Springs, CA, September 1995, pp. 991-1011.
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