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BeiDou Space Segment

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COMPASSCOMPASS
Title BeiDou Space Segment
Edited by GMV
Level Basic
Year of Publication 2011

The COMPASS Space Segment will consist of a constellation of 35 satellites, which include 5 geostationary orbit (GEO) satellites and 30 non-GSO satellites. The system is currently under development evolving from a regional system called BeiDou-1, and in the first phase will provide global navigation services by 2020, similarly to the GPS, GLONASS or Galileo systems.


COMPASS Space Segment

The COMPASS Space Segment will consist of a constellation of 35 satellites, which include 5 geostationary orbit (GEO) satellites and 30 non-GSO satellites; 27 in Medium Earth Orbit (MEO) and 3 in Inclined Geosynchronous Orbit (IGSO), w5th a worldwide coverage.[1][2]

The system is to be deployed in two stages; the launches for the first phase will be completed by 2012[3] and will consist of 14 satellites aiming at the Asia-Pacific region,[1] followed by the deployment of the global system by 2020.[3]

COMPASS Space Segment

As of December 2011, ten Compass satellites have been successfully launched. The first eight of which completed the deployment foreseen for the first phase of BeiDou-2.[3][1][4] Also in December 2011, the COMPASS system went into operation on a trial basis providing initial passive positioning navigation and timing services for the whole Asia-Pacific region with a constellation of 10 satellites (5 GEO satellites and 5 IGSO satellites)[5][2]. During 2012, the system is going to launch another 6 satellites[1][5].

List of Compass Satellites at December 2011 (information as appeared in BeiDou article in Wikipedia.[6] )
Date Launcher Satellite Orbit Usable System
31/10/2000 LM-3A BeiDou-1A GEO 59°E ? Beidou-1
21/12/2000 LM-3A BeiDou-1B GEO 80°E Yes
25/5/2003 LM-3A BeiDou-1C GEO 110.5°E Yes
3/2/2007 LM-3A BeiDou-1D supersync orbit No
14/4/2007 LM-3A Compass-M1 MEO ~21,500 km Testing only Compass
15/4/2009 LM-3C Compass-G2 GEO Drifting No
17/1/2010 LM-3C Compass-G1 GEO 144.5°E Yes
2/6/2010 LM-3C Compass-G3 GEO 84°E Yes
1/8/2010 LM-3A Compass-IGSO1 IGSO 118°E incl 55° Yes
1/11/2010 LM-3C Compass-G4 GEO 160°E Yes
18/12/2010 LM-3A Compass-IGSO2 IGSO 118°E incl 55° Yes
10/4/2011 LM-3A Compass-IGSO3 IGSO 118°E incl 55°, 200~35,991km Yes
26/07/2011 LM-3A Compass-IGSO4 35695 x 35865 km incl 55.2°, 80° to 112°E Yes (?)
02/12/2011 LM-3A Compass-IGSO5 35712 x 35873 km incl 55.2°, 79° to 110°E Yes (?)

The nominal constellation includes 35 satellites, 5 GEOs, 3 IGSOs and 27 MEOs. The number of IGSO orbits is 3, with one IGSO per plane. The intersection node is 118E. The MEOs are deployed as a Walker constellation; 24 MEOs in 3 planes plus 3 spares. The orbital parameters of the final constellation are shown in the following table:[1]

Final Compass constellation
Orbit parmts. GEO IGSO MEO
Semi-Major Axis (Km) 42164 42164 27878
Eccentricity 0 0 0
Inclination (deg) 0 55 55
RAAN (deg) 158.75E, 180E, 210.5E, 240E,260E 218E,98E,338E --
Argument Perigee 0 0
Mean anomaly (deg) 0 218E:0,98E:120,338E:240
# Sats 5 3 27
# Planes 1 3 3

Notes

References

  1. ^ a b c d e China Satellite Navigation Office, Development of BeiDou Navigation Satellite System, Munich Satellite Navigation Summit, 2011 Cite error: Invalid <ref> tag; name "BEIDOU_MUNICH_2011" defined multiple times with different content Cite error: Invalid <ref> tag; name "BEIDOU_MUNICH_2011" defined multiple times with different content
  2. ^ a b COMPASS Navigation system in Wikipedia
  3. ^ a b c Cite error: Invalid <ref> tag; no text was provided for refs named Chinese_today
  4. ^ China completes basic Beidou (Compass) Navigation Satellite System, 2011-04-10 by Globaltimes.cn
  5. ^ a b Satellite navigation system launched, China Daily Europe, December 2011.
  6. ^ Beidou Navigation System in Wikipedia
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