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{{Article Infobox2
{{Article Infobox2
|Category=COMPASS
|Category=BEIDOU
|Title={{PAGENAME}}
|Editors=GMV
|Authors=GMV.
|Level=Basic
|Level=Basic
|YearOfPublication=2011
|YearOfPublication=2011
|Logo=GMV
|Logo=GMV
|Title={{PAGENAME}}
}}
}}
The BeiDou Space Segment consists of a constellation of 35 satellites, which include 5 geostationary orbit (GEO) satellites and 30 non-GSO satellites. The system is currently under development [[BeiDou_Future_and_Evolutions|evolving]] from a regional system called [[Other Regional Systems#BeiDou-1|BeiDou-1]], and in the first phase will provide global navigation services by 2020, similarly to the [[GPS General Introduction|GPS]], [[GLONASS General Introduction|GLONASS]] or [[GALILEO General Introduction|Galileo]] systems.


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. <ref name=Chinese_today>[http://www.sinodefence.com/space/spacecraft/beidou2.asp Compass on the Chinese Defence Today website] </ref>
==BeiDou Space Segment==


==COMPASS Space Segment==
The BeiDou 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), with a worldwide coverage.<ref name=BEIDOU_MUNICH_2011>China Satellite Navigation Office, Development of BeiDou Navigation Satellite System, Munich Satellite Navigation Summit, 2011</ref><ref name=BeiDou_Wiki>[http://en.wikipedia.org/wiki/Beidou_Navigation_Satellite_System BeiDou Navigation Satellite System in Wikipedia]</ref>


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.<ref>[http://en.wikipedia.org/wiki/Beidou_navigation_system BeiDou and Compass in Wikipedia]</ref>
[[File:CompassConstellation.jpg|BeiDou Space Segment|250px|thumb]]


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>
As of December 2011, the Initial Operation Service was officially declared providing initial passive positioning navigation and timing services for China service area<ref name=BeiDou_Wiki />.  
[[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."


{| class="wikitable"
|+align="bottom" |''List of Compass Satellites at April 2011''
|-
!Date!! Launcher !! Satellite !! Orbit !! Usable !! System
|-
|4/14/2007 || Long March 3A (LM-3A) || Compass-M1 || Medium Earth Orbit|MEO ~21,500&nbsp;km || Testing only || rowspan="8" | 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 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:<ref name='Compass_Munich'>''COMPASS Status Presentation'', Munich Satellite Navigation Summit March 2011.</ref>
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:<ref name=BEIDOU_MUNICH_2011/>


{| class="wikitable" align="center"
{| class="wikitable" align="center"
|+align="bottom" |''Final Compass constellation''
|+align="bottom" |''Final BeiDou 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  
|}
|}


==Notes==
 
<references group="footnotes"/>
==References==
==References==
<references/>
<references/>




[[Category:COMPASS]]
[[Category:BEIDOU]]

Latest revision as of 17:20, 18 September 2014


BEIDOUBEIDOU
Title BeiDou Space Segment
Edited by GMV
Level Basic
Year of Publication 2011
Logo GMV.png

The BeiDou Space Segment consists 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.


BeiDou Space Segment

The BeiDou 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), with a worldwide coverage.[1][2]

BeiDou Space Segment

As of December 2011, the Initial Operation Service was officially declared providing initial passive positioning navigation and timing services for China service area[2].


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 BeiDou 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


References

  1. ^ a b China Satellite Navigation Office, Development of BeiDou Navigation Satellite System, Munich Satellite Navigation Summit, 2011
  2. ^ a b BeiDou Navigation Satellite System in Wikipedia
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