Questions about users equipment

GLONASS history Navigation principles BEIDOU FAQ Navigation equipment Links Maps	If the GLONASS signal is free, or it must be paid for? GLONASS signal is free (available in latitude, longitude and altitude) Have the limits on the navigational measurements with the accuracy better than 30 meters been withdrawn? All of geodetic data is regulated by the government regulation RF №326 from 28 may 2007 "About the order of accessing, use and providing of geospatial data" The important alterations in this document: The accuracy of the geodetic points coordinates, is reduced from 30 to 10 metres The restrictions on the determination of the coordinates of geographic features are removed. When will GLONASS provide 100% coverage of Russia territory, and who will provide navigation services? On the 15 December 2009 the head of Russian Space Agency stated that the deployment of the GLONASS will be completed by the end of 2010. Today the constellation consists of 26 SC. And to the end of 2010 will provide 100% availability. If there are any open sources of "up-to date" electronic maps of Russian regions, as well as database of geographical coordinates of objects located on the Russian Federation territory? Digital maps producers: www.navteq.com www.e-is.ru www.mapstor.com The data base of the RF geographical objects is available on: www.geonames.org www.gis-lab.info www.outdoors.ru What is a dual system receiver? The dual system receivers use the signals from all available navigation satellites. That improves the quality of the navigation in real life environment. Insufficient signal from one satellite system is compensated by the signal from another system. What is a dual frequency receiver? Dual-frequency receivers are used to determine the coordinates using the dual-frequency measurements at L1 and L2. Linear combinations of dual-frequency measurements don’t include ionosphere errors of the first order. In addition, for the partial compensation of this error, correction model can be used, which can be analytically calculated using the information contained in the navigation message. The value of the unnmodelable residual ionosphere delay can cause the 10 m error in pseudo range determining. For single-frequency (L1) receiver positioning accuracy - 100m, for a dual frequency (L1, L2) receiver - 16m. Where can I buy books about the GLONASS (legal aspects of the application, principles of construction and operation etc.)? Books about GLONASS can be obtained at: «Radiotehnika» publishing house «Hot Line-Telecom» publishing house What is the fundamental difference between the GLONASS and GPS navigators? The main difference is the signal itself and its structure. GPS system uses code-division channeling. GLONASS uses frequency-division channeling. The structure of the signal also differs. Also the satellites motion is described using fundamentally different mathematical models. In GLONASS differential model of motion is used. And GPS uses a model based on osculating elements.

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