GPS and GLONASS: Similarity and Differences

GPS and GLONASS: Similarity and Differences

Global Positioning System (GPS) and Global Navigation Satellite System (GLONASS) are very similar satellite navigation systems, but  differences are significant:

  

GPS-logo
                 Glonass

In the first place the GLONASS does not have no degradation of the precision neither cryptography.

Orbits of the 2 types of satellite are similar:

  • Satellites GLONASS rotate on 3 orbital planes separated by an angle of 120°. 8 satellites for each plane and are equally spaced from an angle of 45°and identified by slot number which defines the corresponding orbital plane and the location within the plane (ex.1/01 – 1/02 – 3/23).
  • Satellites GPS rotate on 6 planes, 4 for each plane. 

Orbital of inclination plans their respect to plan of equator is:

  • 64.8° on the GLONASS and 55° in the GPS.

Orbits are both circulars:

    Altitude is :

  • 19.140 Km (GLONASS) and period of revolution is 11h 15m.
  • 20.180 Km (GPS) and period of revolution is 11h 58m.

Each satellite GLONASS has own frequencies and transmits both L1 and L2, The latest Glonass -K1 introduce L3 CDMA,All satellites employ cesium atomic clocks.

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