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The [[Work in Progress: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>
The [[Work in Progress: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 [[Work in Progress:Other Regional Systems|BeiDou-1]], and in the first phase will provide high-accuracy positioning services for users in China and its neighbouring 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/>
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 [[Work in Progress: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>
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>
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)''
)''
|-  
|-  
!Date!! Launcher !! Satellite !! Orbit !! Usable !! System
!Date
|-
!Launcher
|4/14/2007 || Long March 3A (LM-3A) || Compass-M1 || Medium Earth Orbit|MEO ~21,500&nbsp;km || Testing only || rowspan="8" | Compass
!Satellite
|-
!Orbit
|4/15/2009 || Long March 3C (LM-3C) || Compass-G2 ||GEO Drifting || No
!Usable
|-
!System
|1/17/2010 || LM-3C || Compass-G1 || GEO 144.5°E || Yes
|- align="center"
|-
!4/14/2007
|6/2/2010 || LM-3C || Compass-G3 ||GEO 84°E || Yes
|Long March 3A (LM-3A)
|-
|Compass-M1
|8/1/2010 || LM-3A || Compass-IGSO1 ||IGSO 118°E incl 55°|| Yes
|Medium Earth Orbit|MEO ~21,500&nbsp;km
|-
|Testing only
|11/1/2010 || LM-3C || Compass-G4 ||GEO 160°E|| Yes
|rowspan="8" | Compass
|-
|- align="center"
|12/18/2010 || LM-3A || Compass-IGSO2 ||IGSO 118°E incl 55° || Yes
!4/15/2009
|-
|Long March 3C (LM-3C)
|04/10/2011 || LM-3A || Compass-IGSO3 ||IGSO 118°E incl 55°, 200~35,991km || Yes
|Compass-G2
|GEO Drifting
|No
|- align="center"
!1/17/2010
|LM-3C
|Compass-G1
|GEO 144.5°E
|Yes
|- align="center"
!6/2/2010
|LM-3C
|Compass-G3
|GEO 84°E
|Yes
|- align="center"
!8/1/2010
|LM-3A
|Compass-IGSO1
|IGSO 118°E incl 55°
|Yes
|- align="center"
!11/1/2010
|LM-3C
|Compass-G4
|GEO 160°E
|Yes
|- align="center"
!12/18/2010
|LM-3A
|Compass-IGSO2
|IGSO 118°E incl 55°
|Yes
|- align="center"
!04/10/2011
|LM-3A
|Compass-IGSO3
|IGSO 118°E incl 55°, 200~35,991km
|Yes
|}
|}


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


Revision as of 15:56, 2 September 2011


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


The Compass Navigation Satellite System (CNSS), also named BeiDou-2,[1] 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.[1][2]

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.[1] 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]

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.[1][3][4]

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.[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.[3] 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

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:[3]

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 f g h Compass Satellite Navigation System (Beidou), on Sinodefence.com, updated on August 6th, 2011.
  2. ^ COMPASS Navigation system in Wikipedia
  3. ^ a b c d China Satellite Navigation Office, Development of BeiDou Navigation Satellite System, Munich Satellite Navigation Summit, 2011.
  4. ^ a b China completes basic Beidou (Compass) Navigation Satellite System, 2011-04-10 by Globaltimes.cn
  5. ^ BeiDou navigation system covers Asia-Pacific region till 2012, 2010-03-03 by Xinhua News Agency
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