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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}}
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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 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==


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/>
==BeiDou Space Segment==


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 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>


[[File:CompassConstellation.jpg|COMPASS Space Segment|250px|thumb]]
[[File:CompassConstellation.jpg|BeiDou 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 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 />.  




{| class="wikitable"
|+align="bottom" |''List of Compass Satellites at April 2011 (information as appeared in BeiDou article in Wikipedia.<ref name="BeidouWiki">[http://en.wikipedia.org/wiki/Beidou_navigation_system Beidou Navigation System in Wikipedia]</ref>
)''
|-
!Date
!Launcher
!Satellite
!Orbit
!Usable
!System
|- align="center"
!4/14/2007
|Long March 3A (LM-3A)
|Compass-M1
|Medium Earth Orbit|MEO ~21,500&nbsp;km
|Testing only
|rowspan="8" | Compass
|- align="center"
!4/15/2009
|Long March 3C (LM-3C)
|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
|}


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.
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{| class="wikitable" align="center"
{| class="wikitable" align="center"
|+align="bottom" |''Final Compass constellation''
|+align="bottom" |''Final BeiDou Constellation''
|-  
|-  
!Orbit parmts.
!Orbit parmts.
Line 136: Line 70:
|}
|}


==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
Retrieved from "https://gssc.esa.int/navipedia/index.php?title=BeiDou_Space_Segment&oldid=13362"