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Other SBASOther SBAS
Title SDCM
Edited by GMV
Level Basic
Year of Publication 2011
Logo GMV.png

The System for Differential Corrections and Monitoring (SDCM) is the SBAS currently being developed in the Russian Federation[1][2] by JSC (Russian Space Systems) [3] as a component of GLONASS.[4]

The main differentiator of SDCM with respect to other SBAS systems is that it is conceived as an SBAS augmentation that would perform integrity monitoring of both GPS and GLONASS satellites.

SDCM Ground Segment

File:Sdcm overview.png
SDCM planned station network

The main components of the SDCM Ground Segment are a network of reference stations, central processing facilities, uplink stations and terrestrial broadcast means.

The SDCM network of reference stations is composed of 19 stations in Russia and 5 stations abroad[3]. However, there are plans to expand the network to 45 stations in Russia and 12 abroad. [5]The central processing facilities are located in Moscow and it is complemented by a reserve facility[6].

In addition to the GEO broadcast, it is foreseen that SDCM provides internet and GSM broadcast from a SISNeT server and an NTRIP server.[4]

SDCM Space Segment

SDCM currently uses transponders on the Luch Multifunctional Space Relay System geostationary communication satellites to transmit correction and integrity data. The SDCM Space Segment will be composed of 3+1 GEO satellites:

SDCM GEO Satellites[7]
Satellite Location Launch Lifespan
Luch-5A 167 deg East Dec 11, 2011 10 years
Luch-5B 16 deg West Nov 3, 2012 10 years
Luch-5 95 deg East 2014 10 years

SDCM Objectives and Performances

With this architecture the whole Russian Federation will be covered as the SDCM Service Area.[8]

The SDCM objectives are:[1]

  • Integrity monitoring of GNSS satellites (GPS and GLONASS)
  • Provide differential corrections to GLONASS satellites
  • A posteriori detail analysis of GLONASS system performances.

The positioning performance provided by SDCM will be of 1 to 1.5 meters in the horizontal plane and of 2 to 3 meters in vertical. In addition, it is expected to offer a cm-level positioning service for users at a range of 200 kilometers of the reference stations.[2]

SDCM Future and Evolutions

The Luch 5A was launched on December 2011 and the Luch-5B on November 2012, having reached the geostationary orbit in December 2012.

The Luch family is expected to be replaced by "Enisey" in the scope of the SDCM evolution[7].



  1. ^ a b SDCM home page.
  2. ^ a b Glen Gibbons, Russia Building Out GLONASS Monitoring Network, Augmentation System Inside GNSS News, September/October 2009
  3. ^ a b SDCM at Unoosa 2015
  4. ^ a b System for Differential Correction and Monitoring Update, Sergey KARUTIN, Deputy head of division, Russian Space Systems, presented at ION GNSS 2011
  5. ^ SDCM at Unoosa 2019.
  6. ^ http://www.unoosa.org/
  7. ^ a b Cite error: Invalid <ref> tag; no text was provided for refs named SDCM_ION_2012
  8. ^ Sergey Revnivykh (Russian Federal Space Agency), GLONASS Updates, Munich Satellite Navigation Congress, March 2011