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


As of April 2011, eight Compass satellites have been successfully launched. According to  Globaltimes.cn<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.''"
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"
{| 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>
|+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>
)''
)''
|-  
|-  
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!System
!System
|- align="center"
|- align="center"
!4/14/2007
!31/10/2000
|Long March 3A (LM-3A)
|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
|Compass-M1
|Medium Earth Orbit|MEO ~21,500&nbsp;km
|Medium Earth Orbit|MEO ~21,500&nbsp;km
|Testing only
|Testing only
|rowspan="8" | Compass
|rowspan="10" | Compass
|- align="center"
|- align="center"
!4/15/2009
!15/4/2009
|Long March 3C (LM-3C)
|LM-3C
|Compass-G2
|Compass-G2
|GEO Drifting
|GEO Drifting
|No
|No
|- align="center"
|- align="center"
!1/17/2010
!17/1/2010
|LM-3C
|LM-3C
|Compass-G1
|Compass-G1
Line 51: Line 75:
|Yes
|Yes
|- align="center"
|- align="center"
!6/2/2010
!2/6/2010
|LM-3C
|LM-3C
|Compass-G3
|Compass-G3
Line 57: Line 81:
|Yes
|Yes
|- align="center"
|- align="center"
!8/1/2010
!1/8/2010
|LM-3A
|LM-3A
|Compass-IGSO1
|Compass-IGSO1
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|Yes
|Yes
|- align="center"
|- align="center"
!11/1/2010
!1/11/2010
|LM-3C
|LM-3C
|Compass-G4
|Compass-G4
Line 69: Line 93:
|Yes
|Yes
|- align="center"
|- align="center"
!12/18/2010
!18/12/2010
|LM-3A
|LM-3A
|Compass-IGSO2
|Compass-IGSO2
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|Yes
|Yes
|- align="center"
|- align="center"
!04/10/2011
!10/4/2011
|LM-3A
|LM-3A
|Compass-IGSO3
|Compass-IGSO3
|IGSO 118°E incl 55°, 200~35,991km
|IGSO 118°E incl 55°, 200~35,991km
|Yes
|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 (?)
|}
|}


Revision as of 11:52, 25 January 2012


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

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 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].


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), w5th a worldwide coverage.[2][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 aiming at the Asia-Pacific region,[2] followed by the deployment of the global system by 2020.[1]

COMPASS Space Segment

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.[1][2][4] 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)[5][3]. During 2012, the system is going to launch another 6 satellites[2][5].

List of Compass Satellites at December 2011 (information as appeared in BeiDou article in Wikipedia.[6] )
Date Launcher Satellite Orbit Usable System
31/10/2000 LM-3A BeiDou-1A GEO 59°E ? Beidou-1
21/12/2000 LM-3A BeiDou-1B GEO 80°E Yes
25/5/2003 LM-3A BeiDou-1C GEO 110.5°E Yes
3/2/2007 LM-3A BeiDou-1D supersync orbit No
14/4/2007 LM-3A Compass-M1 MEO ~21,500 km Testing only Compass
15/4/2009 LM-3C Compass-G2 GEO Drifting No
17/1/2010 LM-3C Compass-G1 GEO 144.5°E Yes
2/6/2010 LM-3C Compass-G3 GEO 84°E Yes
1/8/2010 LM-3A Compass-IGSO1 IGSO 118°E incl 55° Yes
1/11/2010 LM-3C Compass-G4 GEO 160°E Yes
18/12/2010 LM-3A Compass-IGSO2 IGSO 118°E incl 55° Yes
10/4/2011 LM-3A Compass-IGSO3 IGSO 118°E incl 55°, 200~35,991km Yes
26/07/2011 LM-3A Compass-IGSO4 35695 x 35865 km incl 55.2°, 80° to 112°E Yes (?)
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[7].


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:[2]

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 Compass Satellite Navigation System (Beidou), on Sinodefence.com, updated on August 6th, 2011.
  2. ^ a b c d e China Satellite Navigation Office, Development of BeiDou Navigation Satellite System, Munich Satellite Navigation Summit, 2011 Cite error: Invalid <ref> tag; name "BEIDOU_MUNICH_2011" defined multiple times with different content Cite error: Invalid <ref> tag; name "BEIDOU_MUNICH_2011" defined multiple times with different content
  3. ^ a b COMPASS Navigation system in Wikipedia
  4. ^ China completes basic Beidou (Compass) Navigation Satellite System, 2011-04-10 by Globaltimes.cn
  5. ^ a b Satellite navigation system launched, China Daily Europe, December 2011.
  6. ^ Beidou Navigation System in Wikipedia
  7. ^ "Positioning Performance Analysis of the Current COMPASS Constellation", M. Lu, J. Guo, COMPASS Workshop within INO GNSS 2011
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