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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 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.''' "


{| 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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