United Nations Office for Outer Space Affairs

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Global Positioning System (GPS)

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United States of America

The global positioning system (GPS) baseline constellation consists of 24 slots in six orbital planes, with four slots per plane. Three of the slots are expandable and can hold no more than two satellites. Satellites that are not occupying a defined slot in the GPS constellation occupy other locations in the six orbital planes. Constellation reference orbit parameters and slot assignments as of the defined epoch are described in the fourth edition of the GPS Standard Positioning Service Performance Specification, dated September 2008. As of that date, the GPS constellation had 30 operational satellites broadcasting healthy navigation signals: 11 in Block IIA, 12 in Block IIR and 7 in Block IIR-M.

GLObal NAvigation Satellite System (GLONASS)

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Russian Federation The nominal baseline constellation of the Russian Federation's Global Navigation Satellite System (GLONASS) comprises 24 Glonass-M satellites that are uniformly deployed in three roughly circular orbital planes at an inclination of 64.8° to the equator. The altitude of the orbit is 19,100km. The orbit period of each satellite is 11 hours, 15 minutes, 45 seconds. The orbital planes are separated by 120° right ascension of the ascending node. Eight satellites are equally spaced in each plane with 45° argument of latitude. Moreover, the orbital planes have an argument of latitude displacement of 15° relative to each other.

The Compass/BeiDou Navigation Satellite System

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The Compass/BeiDou Navigation Satellite System consists of five geostationary satellites and 30 non-geostationary satellites. The geostationary satellites are located at 58.75° E, 80° E, 110.5° E, 140° E and 160° E.

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