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{{Article Infobox2
{{Article Infobox2
|Category=COMPASS
|Category=BEIDOU
|Authors=GMV
|Editors=GMV
|Level=Basic
|Level=Basic
|YearOfPublication=2011
|YearOfPublication=2011
Line 7: Line 7:
|Title={{PAGENAME}}
|Title={{PAGENAME}}
}}
}}
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 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.




==COMPASS Space Segment==
==BeiDou 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), w5th 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=COMPASS_Wiki>[http://en.wikipedia.org/wiki/Compass_navigation_system COMPASS Navigation system in Wikipedia]</ref>
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 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 aiming at the Asia-Pacific region,<ref name=BEIDOU_MUNICH_2011/> followed by the deployment of the global system by 2020.<ref name=Chinese_today/>
[[File:CompassConstellation.jpg|BeiDou Space Segment|250px|thumb]]


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


As of December 2011, ten Compass satellites have been successfully 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> Also in December 2011, the COMPASS system went into operation on a trial basis  providing initial passive positioning navigation and timing services for the whole Asia-Pacific region with a constellation of 10 satellites (5 GEO satellites and 5 IGSO satellites)<ref name="China Daily">[http://europe.chinadaily.com.cn/business/2011-12/28/content_14343656.htm Satellite navigation system launched], China Daily Europe, December 2011.</ref><ref name=COMPASS_Wiki />. During 2012, the system is going to launch another 6 satellites<ref name=BEIDOU_MUNICH_2011>China Satellite Navigation Office, ''Development of BeiDou Navigation Satellite System'', Munich Satellite Navigation Summit, 2011.</ref><ref name="China Daily" />.
{| class="wikitable"
|+align="bottom" |''List of Compass Satellites at December 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"
!31/10/2000
|LM-3A
|BeiDou-1A
|GEO 59°E
|?
|rowspan="4" | Beidou-1
|- align="center"
!21/12/2000
|LM-3A
|BeiDou-1B
|GEO 80°E
|Yes
|- align="center"
!25/5/2003
|LM-3A
|BeiDou-1C
|GEO 110.5°E
|Yes
|- align="center"
!3/2/2007
|LM-3A
|BeiDou-1D
|supersync orbit
|No
|- align="center"
!14/4/2007
|LM-3A
|Compass-M1
|Medium Earth Orbit|MEO ~21,500&nbsp;km
|Testing only
|rowspan="10" | Compass
|- align="center"
!15/4/2009
|LM-3C
|Compass-G2
|GEO Drifting
|No
|- align="center"
!17/1/2010
|LM-3C
|Compass-G1
|GEO 144.5°E
|Yes
|- align="center"
!2/6/2010
|LM-3C
|Compass-G3
|GEO 84°E
|Yes
|- align="center"
!1/8/2010
|LM-3A
|Compass-IGSO1
|IGSO 118°E incl 55°
|Yes
|- align="center"
!1/11/2010
|LM-3C
|Compass-G4
|GEO 160°E
|Yes
|- align="center"
!18/12/2010
|LM-3A
|Compass-IGSO2
|IGSO 118°E incl 55°
|Yes
|- align="center"
!10/4/2011
|LM-3A
|Compass-IGSO3
|IGSO 118°E incl 55°, 200~35,991km
|Yes
|- align="center"
!26/07/2011
|LM-3A
|Compass-IGSO4
|35695 x 35865 km incl 55.2°, 80° to 112°E
|Yes (?)
|- align="center"
!02/12/2011
|LM-3A
|Compass-IGSO5
|35712 x 35873 km incl 55.2°, 79° to 110°E
|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<ref>"Positioning Performance Analysis of the Current COMPASS Constellation", M. Lu, J. Guo, COMPASS Workshop within INO GNSS 2011</ref>.




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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 171: 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

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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