This page provides an overview of the Satellites in the BeiDou Navigation Satellite System (BDS). Technical parameters of the indivdual satellites and related conventions applied within the MGEX project are summarized in the Spacecraft Characteristics section. Information about the operational status of BeiDou can be found on the website of the Test and Assessment Research Center (TARC) of the China Satellite Navigation Office (CSNO).


The regional BeiDou Navigation Satellite System (BDS-2, earlier referred to as COMPASS) originally comprised a total of 15 launched satellites out of which 13 were fully operational in 2015. BDS-2 replacement satellites have been launched in 2016, 2018, and 2019. In mid 2015, China started the build-up of the 3rd generation BeiDou system (BDS-3) which shall offer a fully global navigation service by 2020. In 2015/2016, five BDS-3S in-orbit validation satellites have been launched. Build-up of the operational BeiDou-3 constellation was delayed by launcher issues and finally started in November 2017. The nominal number of 24 BeiDou-3 MEO satellites was reached in December 2019.

Common Name
Int. Sat. ID
Sat. Cat. Name
C001 BEIDOU M1 2007-011A 31115 BEIDOU 2 C30 launched 2007-04-13; decommissioned
C002 BDS-2 GEO-2 2009-018A 34779 COMPASS G2 C02 launched 2009/04/14; inactive; uncontrolled
C003 BDS-2 GEO-1 2010-001A 36287 BEIDOU 3 C01 140.0°E; launched 2010/01/16
C004 BDS-2 GEO-3 2010-024A 36590 BEIDOU 4 C03 110.5°E; launched 2010/06/02;
inactive since 2018/09/28
C005 BDS-2 IGSO-1 2010-036A 36828 BEIDOU 5 C06 ~117°E; launched 2010/07/31
C006 BDS-2 GEO-4 2010-057A 37210 BEIDOU 6 C04 160.0°E; launched 2010/10/31
C007 BDS-2 IGSO-2 2010-068A 37256 BEIDOU 7 C07 ~119°E; launched 2010/12/17
C008 BDS-2 IGSO-3 2011-013A 37384 BEIDOU 8 C08 ~117°E; launched 2011/04/09
C009 BDS-2 IGSO-4 2011-038A 37763 BEIDOU 9 C09 ~95°E; launched 2011/07/26
C010 BDS-2 IGSO-5 2011-073A 37948 BEIDOU 10 C10 ~96°E; launched 2011/12/01
C011 BDS-2 GEO-5 2012-008A 38091 BEIDOU 11 C05 58.75°E; launched 2012/02/24
C012 BDS-2 MEO-3 2012-018A 38250 BEIDOU 12 C11 between slots A-6 and A-7;
launched 2012/04/29
C013 BDS-2 MEO-4 2012-018B 38251 BEIDOU 13 C12 between slots A-7 and A-8;
launched 2012/04/29
C014 BDS-2 MEO-5 2012-050A 38774 BEIDOU 14 C13 Slot B-3; launched 2012/09/18;
end of signal transmission 2014/10/21
C015 BDS-2 MEO-6 2012-050B 38775 BEIDOU 15 C14 between slots B-3 and B-4;
launched 2012/09/18
C016 BDS-2 GEO-6 2012-059A 38953 BEIDOU 16 C02 80.3°E; launched 2012/10/25
C017 BDS-2 IGSO-6 2016-021A 41434 BEIDOU IGSO-6 C15
~94°E; launched 2016/03/29;
PRN switch from C15 to C13 on 2016/10/11
C018 BDS-2 GEO-7 2016-037A 41586 BD-2-G7 C17
144.5°E; launched 2016/06/12;
PRN switch from C17 to C03 on 2018/09/29
C019 BDS-2 IGSO-7 2018-057A 43539 BEIDOU IGSO-7 C16 launched 2018/07/09
C020 BDS-2 GEO-8 2019-027A 44231 BEIDOU 2 G8 C18 ~80°E; launched 2019/05/17

  • In the absence of official space vehicle numbers (SVNs), preliminary numbers for the BDS-2 satellites have been assigend for use within the MGEX project based on the launch sequence of the respective spacecraft.
  • C004 was moved from 84.0° E to new position between Nov 7 and 22, 2012.
  • BeiDou-2 metadata were published on December 9, 2019.
  • BeiDou-2 MEO satellites have been placed between official slot positions as soon as BeiDou-3 satellites have occupied their initial slot positions.

Common Name
Int. Sat. ID
Sat. Cat. Name
C101 BDS-3S IGSO-1S 2015-019A 40549 BD-17 SECM C16
~93°E; launched 2015/03/30;
PRN switch from C31 to C16 on 2018/04/24
PRN switch from C16 to C31 on 2018/07/10
C102 BDS-3S MEO-1S 2015-037B 40749 BD-19 CAST C33
formerly slot A-1, launched 2015/07/30;
PRN switch from C33 to C19 on 2018/06/14;
C19 transmission until 2018/11/11
C103 BDS-3S MEO-2S 2015-037A 40748 BD-18 CAST C34
Slot A-6, launched 2015/07/30;
PRN switch from C34 to C28 on 2018/06/11;
C28 transmission until 2018/12/20
C104 BDS-3S IGSO-2S 2015-053A 40938 BD-20 CAST C32
~96°E; launched 2015/09/29;
PRN switch from C32 to C18 on 2018/06/07
C18 transmission until 2019/04/24
C105 BDS-3S MEO-3S 2016-006A 41315 BD-21 SECM C35 Slot B-1; launched 2016/02/01

  • The five BEIDOU ??-S satellites are experimental satellites of the BeiDou-3 constellation manufactured by the Shanghai Engineering Center for Microsatellites (SECM) of the China Academy of Science (CAS) and China Academy of Space Technology (CAST), see [5].
  • The association of PRN/SVN and NORAD/Int.Sat.ID numbers for BEIDOU M1-S and M2-S in the above table has been corrected on 02-Nov-2017 based on information from ILRS/SHAO.
  • The I2-S and M1-S satellites can transmit an S-band signal.
  • No receiver tracking of SVN C105/PRN C35 so far. According to [8], C105 suffers from a failure of the transmit antenna.
  • B1/B3 dual-frequency tracking of C101/C31 after PRN switch in July 2018.
  • High-gain antenna measurements on 27/28 July 2018:
    • C101: B1/B2/B3 signal transmission
    • C104: B1/B3 signal transmission
    • C103: B1/B2/B3 signal transmission

Common Name
Int. Sat. ID
Sat. Cat. Name
C201 BDS-3 MEO-1 2017-069A 43001 BEIDOU-3 M1 CAST C19
Slot B-7; launched 2017/11/05;
PRN C19 used until 2018/06/12 and since 2018/11/15
C202 BDS-3 MEO-2 2017-069B 43002 BEIDOU-3 M2 CAST C20 Slot B-8; launched 2017/11/05
C203 BDS-3 MEO-7 2018-003A 43107 BEIDOU 3M3 SECM C27 Slot A-4; launched 2018/01/11
C204 BDS-3 MEO-8 2018-003B 43108 BEIDOU 3M4 SECM C28
Slot A-5; launched 2018/01/11;
PRN C28 used until 2018/06/11 and since 2018/12/20
C205 BDS-3 MEO-4 2018-018A 43207 BEIDOU 3M5 CAST C22 Slot B-6; launched 2018/02/12
C206 BDS-3 MEO-3 2018-018B 43208 BEIDOU 3M6 CAST C21 Slot B-5; launched 2018/02/12
C207 BDS-3 MEO-9 2018-029A 43245 BEIDOU 3M7 SECM C29 Slot A-2; launched 2018/03/29
C208 BDS-3 MEO-10 2018-029B 43246 BEIDOU 3M8 SECM C30 Slot A-3; launched 2018/03/29
C209 BDS-3 MEO-5 2018-062A 43581 BEIDOU 3M9 CAST C23 Slot C-7; launched 2018/07/29
C210 BDS-3 MEO-6 2018-062B 43582 BEIDOU 3M10 CAST C24 Slot C-1; launched 2018/07/29
C211 BDS-3 MEO-12 2018-067A 43602 BEIDOU 3M11 SECM C26 Slot C-2; launched 2018/08/24
C212 BDS-3 MEO-11 2018-067B 43603 BEIDOU 3M12 SECM C25 Slot C-8; launched 2018/08/24
C213 BDS-3 MEO-13 2018-072A 43622 BEIDOU 3M13 CAST C32 Slot B-1; launched 2018/09/19
C214 BDS-3 MEO-14 2018-072B 43623 BEIDOU 3M14 CAST C33 Slot B-3; launched 2018/09/19
C215 BDS-3 MEO-16 2018-078A 43647 BEIDOU 3M15 SECM C35 Slot A-1; launched 2018/10/15
C216 BDS-3 MEO-15 2018-078B 43648 BEIDOU 3M16 SECM C34 Slot A-7; launched 2018/10/15
C217 BDS-3 GEO-1 2018-085A 43683 BEIDOU 3G1 CAST C59 launched 2018/11/01
C218 BDS-3 MEO-17 2018-093A 43706 BEIDOU 3M17 CAST C36 Slot C-4; launched 2018/11/18
C219 BDS-3 MEO-18 2018-093B 43707 BEIDOU 3M18 CAST C37 Slot C-6; launched 2018/11/18
C220 BDS-3 IGSO-1 2019-023A 44204 BEIDOU 3 IGSO-1 CAST C38 ~110.5° E; launched 2019/04/20
C221 BDS-3 IGSO-2 2019-035A 44337 BEIDOU 3 IGSO-2 CAST C39 launched 2019/06/24
C222 BDS-3 MEO-24 2019-061A 44542 BEIDOU 3M23 CAST C46 Slot C-5; launched 2019/09/22
C223 BDS-3 MEO-23 2019-061B 44543 BEIDOU 3M24 CAST C45 Slot C-3; launched 2019/09/22
C224 BDS-3 IGSO-3 2019-073A 44709 BEIDOU 3 IGSO-3 CAST C40 launched 2019/11/04
C225 BDS-3 MEO-22 2019-078A 44793 BEIDOU 3M21 SECM C44 Slot A-8; launched 2019/11/23
C226 BDS-3 MEO-21 2019-078B 44794 BEIDOU 3M22 SECM C43 Slot A-6; launched 2019/11/23
C227 BDS-3 MEO-19 2019-090A 44864 BEIDOU 3M19 CAST C41 Slot B-2; launched 2019/12/16
C228 BDS-3 MEO-20 2019-090B 44865 BEIDOU 3M20 CAST C42 moving to slot B-4; launched 2019/12/16

  • As no official space vehicle numbers (SVNs) are available, SVNs are assigned based on the satellite generation:
    • C0?? for BeiDou-2
    • C1?? for BeiDou-3S
    • C2?? for BeiDou-3
    with monotonically increasing number within each satellite generation.
  • The numbering of the spacecraft in the satellite catalog differs from the common names for some satellites.
  • Common names are composed of the satellite type (BDS-2/BDS-3S/BDS-3) and the SVN from the Constellation Status website of CSNO/TARC.
  • The SVN used here follows the satellite catalog number (NORAD ID). In case of dual launches, the smaller NORAD ID is assigned the smaller SVN and vice versa.
  • Ten out of the 24 BDS-3 MEO satellites are manufactured by the Shanghai Engineering Center for Microsatellites (SECM), the others by the China Academy of Space Technology (CAST).
  • The PRN/SVN assignment of C222 and C223 was changed on 28-Nov-2019 according to information provided by CSNO/TARC.
  • The PRN/SVN assignment of C225 and C226 was changed on 08-Jan-2020 according to information provided by CSNO/TARC.
  • Information on BDS-3 is preliminary and might be subject to change.
  • PRNs beyond C37 are currently only tracked by Trimble Alloy receivers with firmware 5.42 (or later).

Spacecraft Characteristics


A comprehensive collection of technical information with associated references for the BeiDou-2 satellites can be obtained at the CNSS page of ESA's eoPortal . BeiDou-2 metadata were released in December 2019 and are available on the BeiDou website.

The BeiDou-2 spacecraft are equipped with broadband GNSS antennas for the B1, B2, and B3 frequency bands as well as a laser retroreflector array (LRA) for satellite laser ranging. Frequency-specific antenna phase center offsets as well as LRA offsets are provided on the CSNO/TARC website. A corresponding ANTEX file is also available.

Satellite Bus DFH-3B DFH-3B DFH-3 (?)
In-orbit mass 1382 - 1551 kg 1272 - 1284 kg 1176 - 1193 kg
Body size ~1.8 m x ~2.2 m x ~2.5 m ~1.8 m x ~2.2 m x ~2.5 m ~1.8 m x ~2.2 m x ~2.5 m
Solar array size 2 x 3 x 2.2 m x 1.7 m 2 x 3 x 2.2 m x 1.7 m 2 x 3 x 2.2 m x 1.7 m
Span width ~17.7 m ~17.7 m ~17.7 m
Cross section ~27 m2 ~27 m2 ~27 m2
SRP acceleration 102 nm/s2 122 nm/s2 130 nm/s2

Figure 1 illustrates the IGS-specific spacecraft coordinate system. This system is aligned with the main body axes and originates in the plane opposite to the antenna. For all three spacecraft types

  • the +zIGS-axis is oriented along the boresight direction of the antenna,
  • the +yIGS-axis is parallel to the rotation axis of the solar panels, and
  • the +xIGS-axis completes a right handed system.
The detailed orientation of the +xIGS and +yIGS-axes for the BeiDOu-2 satellites is defined as shown in the drawings. The GNSS antenna is shifted in +xIGS-direction relative to the center of the front panel, while the LRA is located in the -xIGS/-yIGS-corner. On GEO satellites, the +xIGS-panel holds the C-band telecommunication antenna.

Fig. 1 Spacecraft reference system and sensor location for the IGSO/MEO (left) and GEO satellites (right) of the BeiDou-2 regional navigation system. Reproduced from DOI 10.1016/j.asr.2015.06.019 with permission of Elsevier; satellite images courtesy CSNO.

The attitude of the BeiDou-2 satellites is actively controlled to orient the +zIGS axis towards the Earth. For the MEO and IGSO satellites a yaw steering attitude is employed, in which the satellite is continuously rotated about the +zIGS axis to maintain the yIGS-axis perpendicular to the plane made up by the Sun, Earth, and satellite. Similar to the IGS satellites, the +xIGS-axis is pointed towards the sun-lit hemisphere. For the GEO satellites an orbit normal mode is adopted, in which the +yIGS is oriented perpendicular to the orbital plan. The orbit normal mode is also employed by the MEO/IGSO satellite when the Sun elevation above the orbital plane is less than about 4°. An overview of BeiDou-2 attitude modes and related mathematical formulations are provided in [3]. Mode transitions at low β-angles are further discussed in [4].

The BDS-2 IGSO satellite C017 does not enter orbit normal mode. F. Dilssner (ESOC) developed an attitude model for this satellite [6] and reports that the MEO satellite C015 and the IGSO satellite C005 follow also this attitude law since October 2016 and March 2017, respectively. Reverse PPP analysis revealed that also C019 does not enter orbit normal mode [9] and that the attitude model of [6] is also valid for this satellite.


BeiDou-3S stands for five BeiDou-3 test satellites launched in 2015/2016. They transmit legacy B1 signals similar to the BeiDou-2 satellites as well as modernized signals in the L1, E5, and B3 band.

Manufacturer satellite antenna phase center offsets as well as SLR retroreflector offsets for C101 - C104 are published in [5]. The M1S/M2S satellites are equipped with an additional fold-out phased array antenna. However, it is unknown which navigation signals are transmitted by this antenna.

Fig. 2 Artist view of the SECM BeiDou-3S MEO satellite. Image courtesy of SECM.

Mass ~1000 kg 848 kg 2800 kg
Body size 2.0 m x 2.5 m x 3.6 m
SRP acceleration 138 nm/s2 86 nm/s2 99 nm/s2
Notes Antenna failure [8] First Chinese H-maser in space


Information on the dimensions and the attitude law of the BDS-3 MEO satellites manufactured by SECM as well as PCO and LRA offset values are published in [7]. Metadata including current PRN/SVN assignment, satellite mass, LRA offsets, areas, and absorption coefficient are available at the BeiDou website (RAR compressed ASCII file). Frequency-specific antenna phase center offsets for BDS-2 and BDS-3 are proviced in a dedicated ANTEX file. Further information, attitude law, and format descritions are given in [11].

Bus DFH-3B
In-orbit mass 941 - 1061 kg 1010 - 1079 kg 2950 kg 3000 kg
Body size 2.55 m x 1.01 m x 1.23 m 2.25 m x 1.00 m x 1.22 m
Solar array size 2 x 1.5 m x 4.7 m
Primary clocks 2 RAFSs from CASC 2 PHMs from SHAO
Backup clocks 2 RAFSs from CASIC 2 RAFSs from CASIC


CASC China Aerospace Science and Technology Corporation
CASIC China Aerospace Science and Industry Corporation
CAST China Academy of Space Technology
SHAO Shanghai Astronomical Observatory
SECM Shanghai Engineering Center for Microsatellites


[1] ILRS BeiDou (COMPASS) Center of Mass Information
[2] Dilssner F., Springer T., Schönemann E., Enderle W. (2014) Estimation of satellite antenna phase center corrections for BeiDou, IGS Workshop, Pasadena, California, USA
[3] Montenbruck O., Schmid R., Mercier F., Steigenberger P., Noll C., Fatkulin R., Kogure S., Ganeshan A.S. (2015) GNSS satellite geometry and attitude models, Advances in Space Research 56(6):1015-1029, DOI 10.1016/j.asr.2015.06.019
[4] Dai X., Ge M., Lou Y., Shi C., Wickert J., Schuh H. (2015) Estimating the yaw-attitude of BDS IGSO and MEO satellites, Journal of Geodesy 89(10):1005-1018, DOI 10.1007/s00190-015-0829-x
[5] Zhao Q., Wang C., Guo J., Wang B., Liu J. (2018) Precise orbit and clock determination for BeiDou-3 experimental satellites with yaw attitude analysis, GPS Solutions 22:4, DOI 10.1007/s10291-017-0673-y
[6] Dilssner F. (2017) A note on the yaw attitude modeling of BeiDou IGSO-6
[7] Shanghai Engineering Center for Microsatellites (2018) Satellite Geometry and Attitude Mode of MEO Satellites Developed by SECM, ION GNSS+ 2018
[8] Zhou R., Hu Z., Zhao Q., Li P., Wang W., He C., Cai C., Pan Z. (2018) Elevation-dependent pseudorange variation characteristics analysis for the new-generation BeiDou satellite navigation system, GPS Solututions 22:60, DOI 10.1007/s10291-018-0726-x
[9] Dilssner F. (2018), BeiDou IGSO-7, personal communication, 11 November 2018
[10] CSNO (2019) Definitions and descriptions of BDS/GNSS satellite parameters for high precision applications, BD 420025-2019, in Chinese

Last Updated: 2020/01/08 10:31:59
Please include the IGS logo and citation in all websites, presentations, publications, or posters that use IGS data, products, or services. IGS is a service of IAG.