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It is planned that Compass system will have more than 10 satellites by 2012 and may offer services for the Asia-Pacific region. The global navigation system should be finished by 2020.<ref>[http://news.xinhuanet.com/mil/201003/03/content_13087844.htm ''BeiDou navigation system covers Asia-Pacific region till 2012''], 2010-03-03 by Xinhua News Agency </ref>
It is planned that Compass system will have more than 10 satellites by 2012 and may offer services for the Asia-Pacific region. The global navigation system should be finished by 2020.<ref>[http://news.xinhuanet.com/mil/201003/03/content_13087844.htm ''BeiDou navigation system covers Asia-Pacific region till 2012''], 2010-03-03 by Xinhua News Agency </ref>
[[File:CompassConstellation.jpg|COMPASS Space Segment|200px|thumb]]
[[File:CompassConstellation.jpg|COMPASS Space Segment|250px|thumb]]


As of April 2011, eight satellites for Compass have been launched. According to an official report <ref name="Compass-IGSO3">[http://business.globaltimes.cn/industries/2011-04/642763.html ''China completes basic Beidou (Compass) Navigation Satellite System''], 2011-04-10 by Globaltimes.cn</ref>, "the eighth Beidou satellite marks the completion of basic function of Beidou (Compass) Navigation Satellite System...collaborate with five navigation satellites...will be able to provide services to most regions in China after a period of orbiting running tests and system integration."
As of April 2011, eight satellites for Compass have been launched. According to an official report <ref name="Compass-IGSO3">[http://business.globaltimes.cn/industries/2011-04/642763.html ''China completes basic Beidou (Compass) Navigation Satellite System''], 2011-04-10 by Globaltimes.cn</ref>, "the eighth Beidou satellite marks the completion of basic function of Beidou (Compass) Navigation Satellite System...collaborate with five navigation satellites...will be able to provide services to most regions in China after a period of orbiting running tests and system integration."

Revision as of 12:39, 15 July 2011


COMPASSCOMPASS
Title BeiDou Space Segment
Author(s) GMV.
Level Basic
Year of Publication 2011
Logo GMV.png


The Compass Navigation Satellite System (CNSS), or BeiDou-2, is China’s second-generation satellite navigation system capable of providing positioning, navigation, and timing services to users on a continuous worldwide basis.

The system has evolved from a regional system called BeiDou-1, and in the first phase will provide high-accuracy positioning services for users in China and its neighbouring regions. The long-term goal is to develop an independent global navigation satellite network similar to the GPS and GLONASS. [1]

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 GSO (IGSO),that will offer complete coverage of the globe.[2]

It is planned that Compass system will have more than 10 satellites by 2012 and may offer services for the Asia-Pacific region. The global navigation system should be finished by 2020.[3]

COMPASS Space Segment

As of April 2011, eight satellites for Compass have been launched. According to an official report [4], "the eighth Beidou satellite marks the completion of basic function of Beidou (Compass) Navigation Satellite System...collaborate with five navigation satellites...will be able to provide services to most regions in China after a period of orbiting running tests and system integration."

List of Compass Satellites at April 2011
Date Launcher Satellite Orbit Usable System
4/14/2007 Long March 3A (LM-3A) Compass-M1 MEO ~21,500 km Testing only Compass
4/15/2009 Long March 3C (LM-3C) Compass-G2 GEO Drifting No
1/17/2010 LM-3C Compass-G1 GEO 144.5°E Yes
6/2/2010 LM-3C Compass-G3 GEO 84°E Yes
8/1/2010 LM-3A Compass-IGSO1 IGSO 118°E incl 55° Yes
11/1/2010 LM-3C Compass-G4 GEO 160°E Yes
12/18/2010 LM-3A Compass-IGSO2 IGSO 118°E incl 55° Yes
04/10/2011 LM-3A Compass-IGSO3 IGSO 118°E incl 55°, 200~35,991km Yes

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

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. ^ Compass on the Chinese Defence Today website
  2. ^ BeiDou and Compass in Wikipedia
  3. ^ BeiDou navigation system covers Asia-Pacific region till 2012, 2010-03-03 by Xinhua News Agency
  4. ^ China completes basic Beidou (Compass) Navigation Satellite System, 2011-04-10 by Globaltimes.cn
  5. ^ COMPASS Status Presentation, Munich Satellite Navigation Summit March 2011.