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{{Article Infobox2
{{Article Infobox2
|Category=COMPASS
|Category=COMPASS
|Title={{PAGENAME}}
|Authors=GMV
|Authors=GMV
|Level=Basic
|Level=Basic
|YearOfPublication=2011
|YearOfPublication=2011
|Logo=GMV
|Logo=GMV
|Title={{PAGENAME}}
}}
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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 [[Other Regional Systems|BeiDou-1]], and in the first phase will provide high-accuracy positioning services for users in China and its neighboring regions by 2012<ref name=Chinese_today>[http://www.sinodefence.com/space/satellite/compass-beidou2.asp Compass Satellite Navigation System (Beidou), on Sinodefence.com, updated on August 6th, 2011.] </ref>. In a second stage, the system will evolve to provide global navigation services by 2020, similarly to the [[GPS General Introduction|GPS]], [[GLONASS General Introduction|GLONASS]] or [[GALILEO General Introduction|Galileo]] systems<ref name=Chinese_today/>.


The [[COMPASS General Introduction|Compass Navigation Satellite System (CNSS)]], also named BeiDou-2,<ref name=Chinese_today>[http://www.sinodefence.com/space/satellite/compass-beidou2.asp Compass Satellite Navigation System (Beidou), on Sinodefence.com, updated on August 6th, 2011.] </ref> is China’s second-generation satellite navigation system that will be capable of providing positioning, navigation, and timing services to users on a continuous worldwide basis.<ref name=Chinese_today/><ref name=COMPASS_Wiki>[http://en.wikipedia.org/wiki/Compass_navigation_system COMPASS Navigation system in Wikipedia]</ref>
Although the upgrade of its regional navigation system towards a global solution started in 1997, the formal approval by the Government of the development and deployment of BeiDou-2/CNSS was done in 2004.<ref name=Chinese_today/> The system is currently under development evolving from a regional system called [[Other Regional Systems|BeiDou-1]], and in the first phase will provide high-accuracy positioning services for users in China and its neighboring regions by 2012.<ref name=Chinese_today/> In a second stage, the system will evolve to provide global navigation services by 2020, similarly to the [[GPS General Introduction|GPS]], [[GLONASS General Introduction|GLONASS]] or [[GALILEO General Introduction|Galileo]] systems.<ref name=Chinese_today/>
As of August 2011, nine satellites for Compass have been launched, the first eight of which completed the deployment foreseen for the first phase of BeiDou-2.<ref name=Chinese_today/><ref name=BEIDOU_MUNICH_2011>China Satellite Navigation Office, ''Development of BeiDou Navigation Satellite System'', Munich Satellite Navigation Summit, 2011.</ref><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>


==COMPASS Space Segment==
==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), which will offer complete coverage of the globe.<ref name=BEIDOU_MUNICH_2011/><ref name=COMPASS_Wiki/>
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), which will offer complete coverage of the globe.<ref name=BEIDOU_MUNICH_2011>China Satellite Navigation Office, Development of BeiDou Navigation Satellite System, Munich Satellite Navigation Summit, 2011</ref><ref name=COMPASS_Wiki>[http://en.wikipedia.org/wiki/Compass_navigation_system COMPASS Navigation system in Wikipedia]</ref>


The system is to be deployed in two stages; the launches for the first phase will be completed by 2012<ref name=Chinese_today/> and will consist of 14 satellites serving the Asia-Pacific region.<ref name=BEIDOU_MUNICH_2011/> The global navigation system should be finished by 2020.<ref name=Chinese_today/>
The system is to be deployed in two stages; the launches for the first phase will be completed by 2012<ref name=Chinese_today/> and will consist of 14 satellites serving the Asia-Pacific region.<ref name=BEIDOU_MUNICH_2011/> The global navigation system should be finished by 2020.<ref name=Chinese_today/>
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[[File:CompassConstellation.jpg|COMPASS Space Segment|250px|thumb]]
[[File:CompassConstellation.jpg|COMPASS Space Segment|250px|thumb]]


As of April 2011, eight satellites for Compass have been launched. According to  Globaltimes.cn<ref name="Compass-IGSO3"/>, "''the eighth Beidou satellite marks the completion of basic function of Beidou (Compass) Navigation Satellite System and will collaborate with five navigation satellites launched last year to establish a navigating system of three GEO (geostationary orbit) satellites plus three IGSO (Inclined Geo Synchronous orbit) satellites. The system 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  Globaltimes.cn<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 and will collaborate with five navigation satellites launched last year to establish a navigating system of three GEO (geostationary orbit) satellites plus three IGSO (Inclined Geo Synchronous orbit) satellites. The system will be able to provide services to most regions in China after a period of orbiting running tests and system integration.''"




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Current COMPASS constellation consists of 3 GEO and 3 IGSO satellites (being the remaining satellites under test and in-orbit maintenance) which are able to provide PNT services in Chine and its surrounding areas<ref>"Positioning Performance Analysis of the Current COMPASS Constellation", M. Lu, J. Guo, COMPASS Workshop within INO GNSS 2011</ref>.


The nominal constellation includes 35 satellites, 5 GEOs, 3 IGSOs and 27 MEOs.
The nominal constellation includes 35 satellites, 5 GEOs, 3 IGSOs and 27 MEOs.

Revision as of 16:53, 22 November 2011


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

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 high-accuracy positioning services for users in China and its neighboring regions by 2012[1]. In a second stage, the system will evolve to provide global navigation services by 2020, similarly to the GPS, GLONASS or Galileo systems[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 Geosynchronous Orbit (IGSO), which will offer complete coverage of the globe.[2][3]

The system is to be deployed in two stages; the launches for the first phase will be completed by 2012[1] and will consist of 14 satellites serving the Asia-Pacific region.[2] The global navigation system should be finished by 2020.[1]

COMPASS Space Segment

As of April 2011, eight satellites for Compass have been launched. According to Globaltimes.cn[4], "the eighth Beidou satellite marks the completion of basic function of Beidou (Compass) Navigation Satellite System and will collaborate with five navigation satellites launched last year to establish a navigating system of three GEO (geostationary orbit) satellites plus three IGSO (Inclined Geo Synchronous orbit) satellites. The system 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 (information as appeared in BeiDou article in Wikipedia.[5] )
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

Current COMPASS constellation consists of 3 GEO and 3 IGSO satellites (being the remaining satellites under test and in-orbit maintenance) which are able to provide PNT services in Chine and its surrounding areas[6].


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:[2]

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 Compass Satellite Navigation System (Beidou), on Sinodefence.com, updated on August 6th, 2011.
  2. ^ a b c China Satellite Navigation Office, Development of BeiDou Navigation Satellite System, Munich Satellite Navigation Summit, 2011
  3. ^ COMPASS Navigation system in Wikipedia
  4. ^ China completes basic Beidou (Compass) Navigation Satellite System, 2011-04-10 by Globaltimes.cn
  5. ^ Beidou Navigation System in Wikipedia
  6. ^ "Positioning Performance Analysis of the Current COMPASS Constellation", M. Lu, J. Guo, COMPASS Workshop within INO GNSS 2011