Other Satellite Navigation Systems - Understanding GPS: Principles and Applications - page 614

will likely follow the European lead and deploy their system only if the Europeans
deploy Eurofix. Eurofix is a proposal by Delft University of Technology, in the
Netherlands, for upgrading Loran-C with integrated differential and communica-
tion services. Under the concept published on the Eurofix Web site, Loran-C or
Chaika could be upgraded to broadcast low-data-rate differential corrections. Delft
assigned eight possible channels: DGPS, DGLONASS, Differential Loran-C/Differ-
ential Chaika, navigation integrity messages, short-text message services, and three
channels reserved for future applications [10].
11.1.12 Other GLONASS Information Sources
In addition to the materials provided in this chapter, other resources are available on
the GLONASS program and signal structure. These include topics [30, 31] pub-
lished by the Russians on GLONASS, the availability of the GLONASS Interface
Control Document (ICD), which is a living specification of the navigation signal,
and various information centers that provide information on GLONASS over the
Internet. The ICD and a number of information centers are presented in the follow-
ing sections.
11.1.12.1 GLONASS ICD
The specifications for the GLONASS signals are documented in the GLONASS ICD.
The ICD provides the specifications to build a properly functioning GLONASS user
set. To date, the Russians have published five versions of the GLONASS ICD; the
latest was published on September 30, 2002. The fifth version covers the GLONASS
civil signals on L1 and L2 corresponding to GLONASS and GLONASS-M satellites.
A new version is not expected until shortly before the first GLONASS-K launch
in the 2008 time frame. The current GLONASS ICD is available in English at [32].
11.1.12.2 GLONASS Information Centers
The Russians operate various information centers that provide information on
GLONASS on the Internet. Most of the Web sites provide information in English
and Russian. The maintenance of the Web sites, especially the English portions of
the Web sites, is intermittent. The four major information centers and associated
Web addresses are listed next.
CSIC of Russian Space Forces
The CSIC is the official public interface for GLONASS. The CSIC is operated by the
Russian Space Forces and was set up to be the Russian counterpart to the U.S. Coast
Guard's GPS Information Center. The CSIC acts as the main interface between the
military operators of GLONASS and the Russian Department of Air Traffic and the
Ministry of Transport. The CSIC can provide assistance in the following areas [5, 33]:
• Provide consultations, information, and expertise to increase the effective use
of the GLONASS system;