![general navigation structure](/https/ilrs.cddis.eosdis.nasa.gov/images/mission_general.png)
Galileo
Jump to: Mission Objectives, Mission Instrumentation, Mission Parameters, Additional Information
Mission Photos:
Courtesy of ESA
Mission Objectives:
Galileo is a satellite radio navigation system initiative launched by the European Union and the European Space Agency. Galileo consists of a constellation of 30 satellites (27 operational satellites plus 3 satellites in reserve) and ground stations providing position information to users in many sectors (transportation, social services, justice system, custom services, public works, search and rescue, etc.). Two experimental spacecraft were launched in 2005 and 2008 as part of the Galileo System Test Bed V2: GIOVE-A (Galileo In-Orbit Validation Element, formerly GSTB-V2/A) and GIOVE-B (formerly GSTB-V2/B).
The main objectives of the Galileo system are:
- Provide global navigation satellite system specifically for civilian purposes
- Generate new, large markets and provide the critical advance in technology for Europe and its partners
- Provide global Search and Rescue (SAR) function
The Galileo system consists of global, regional and local components. The global component consists of the satellites and ground segment. The regional component consist of a number off External Region Integrity Systems (ERIS) implemented to obtain higher integrity services independent of the Galileo system. Local components may be deployed for enhancing the performance of Galileo locally. These will enable higher performance such as the delivery of navigation signal in areas where the satellite signals cannot be received.
All Galileo satellites will be equipped with LLR arrays to provide precise orbit determination. Both routine SLR tracking and occasional campaigns with more intense tracking will be required. Laser tracking of Galileo will be comparable to GLONASS and GPS tracking (perhaps up to 40 percent more return energy than GPS).
Due to a launch anomaly, the first two Fully Operational Capability (FOC) Galileo satellites (-201 and -202), launched August 22, did not reach their expected orbit. A series of maneuvers were used to push the satellites to useable orbits.
Mission Instrumentation:
Galileo will have the following components:
- Satellite components:
- L-band antenna for transmitting navigation signals
- Search and rescue (S&R) antenna to pick up distress signals
- C-band antenna to receive signals from up-link stations
- Two S-band antennas for transmiting housekeeping data and receiving control commands
- IR Earth sensors for spacecraft pointing
- FSS sun sensors for spacecraft pointing
- Laser retro-reflector array for orbit determination
- Space radiators for heat exchange
- Interior payload:
- Passive maser clock
- Rubidium clock
- Clock monitoring and control unit
- Navigation signal generator
- Remote terminal unit
- Interior service module:
- Solar array drive mechanism (SADM)
- Gyroscopes
- Reaction wheels
- Magneto bar
- Power conditioning and distribution unit
- On-board computer
Mission Parameters:
Galileo-101 | Galileo-102 | Galileo-103 | Galileo-104 | |
Sponsor: | ESA | ESA | ESA | ESA |
Expected Life: | 12 years | 12 years | 12 years | 12 years |
Primary Applications: | Positioning | Positioning | Positioning | Positioning |
COSPAR ID: | 1106001 | 1106002 | 1205501 | 1205502 |
SIC Code: | 7101 | 7102 | 7103 | 7104 |
Satellite Catalog (NORAD) Number: | 37846 | 37847 | 38857 | 38858 |
PRN | E11 | E12 | E19 | E20 |
Launch Date: | 21-Oct-2011 | 21-Oct-2011 | 12-Oct-2012 | 12-Oct-2012 |
RRA Size: | ||||
RRA Shape: | planar | planar | planar | planar |
Reflectors: | 84 corner cubes | 84 corner cubes | 84 corner cubes | 84 corner cubes |
Size of Reflector: | 33 mm diameter, 23.3 mm height | 33 mm diameter, 23.3 mm height | 33 mm diameter, 23.3 mm height | 33 mm diameter, 23.3 mm height |
Orbit: | near-circular | near-circular | near-circular | near-circular |
Orbital period: | 14.08 hrs | 14.08 hrs | 14.08 hrs | 14.08 hrs |
Inclination: | 56 degrees | 56 degrees | 56 degrees | 56 degrees |
Altitude: | 23,220 km | 23,220 km | 23,220 km | 23,220 km |
Eccentricity: | < 0.001 | < 0.001 | < 0.001 | < 0.001 |
Galileo-201 | Galileo-202 | Galileo-203 | Galileo-204 | |
Sponsor: | ESA | ESA | ESA | ESA |
Expected Life: | 12 years | 12 years | 12 years | 12 years |
Primary Applications: | Positioning | Positioning | Positioning | Positioning |
COSPAR ID: | 1405001 | 1405002 | 1501701 | 1501702 |
SIC Code: | 7201 | 7202 | 7203 | 7204 |
Satellite Catalog (NORAD) Number: | 40128 | 40129 | 40544 | 40545 |
PRN | E18 | E14 | E26 | E22 |
Launch Date: | 22-Aug-2014 | 22-Aug-2014 | 27-Mar-2015 | 27-Mar-2015 |
RRA Size: | ||||
RRA Shape: | planar | planar | planar | planar |
Reflectors: | 60 corner cubes | 60 corner cubes | 60 corner cubes | 60 corner cubes |
Size of Reflector: | 28.2 mm diameter, 19.1 mm height | 28.2 mm diameter, 19.1 mm height | 28.2 mm diameter, 19.1 mm height | 28.2 mm diameter, 19.1 mm height |
Orbit: | eccentric | eccentric | near-circular | near-circular |
Orbital period: | 14.08 hrs | 14.08 hrs | ||
Inclination: | 50 degrees | 50 degrees | 56 degrees | 56 degrees |
Altitude: | 17,000 - 26,210 km | 17,000 - 26,210 km | 23,220 km | 23,220 km |
Eccentricity: | ~ 0.158 | ~ 0.158 | < 0.001 | < 0.001 |
Galileo-205 | Galileo-206 | Galileo-207 | Galileo-208 | |
Sponsor: | ESA | ESA | ESA | ESA |
Expected Life: | 12 years | 12 years | 12 years | 12 years |
Primary Applications: | Positioning | Positioning | Positioning | Positioning |
COSPAR ID: | 1504501 | 1504502 | 1606901 | 1507902 |
SIC Code: | 7205 | 7206 | 7207 | 7208 |
Satellite Catalog (NORAD) Number: | 40889 | 40890 | 41859 | 41175 |
PRN | E24 | E30 | E07 | E08 |
Launch Date: | 11-Sep-2015 | 11-Sep-2015 | 17-Nov-2016 | 17-Dec-2015 |
RRA Size: | ||||
RRA Shape: | planar | planar | planar | planar |
Reflectors: | 60 corner cubes | 60 corner cubes | 60 corner cubes | 60 corner cubes |
Size of Reflector: | 28.2 mm diameter, 19.1 mm height | 28.2 mm diameter, 19.1 mm height | 28.2 mm diameter, 19.1 mm height | 28.2 mm diameter, 19.1 mm height |
Orbit: | near-circular | near-circular | near-circular | near-circular |
Orbital period: | ||||
Inclination: | 56 degrees | 56 degrees | 56 degrees | 56 degrees |
Altitude: | 23,220 km | 23,220 km | 23,220 km | 23,220 km |
Eccentricity: | < 0.001 | < 0.001 | < 0.001 | < 0.001 |
Galileo-209 | Galileo-210 | Galileo-211 | Galileo-212 | |
Sponsor: | ESA | ESA | ESA | ESA |
Expected Life: | 12 years | 12 years | 12 years | 12 years |
Primary Applications: | Positioning | Positioning | Positioning | Positioning |
COSPAR ID: | 1507901 | 1603002 | 1603001 | 1606902 |
SIC Code: | 7209 | 7210 | 7211 | 7212 |
Satellite Catalog (NORAD) Number: | 41174 | 41550 | 41549 | 41860 |
PRN | E09 | E01 | E02 | E03 |
Launch Date: | 17-Dec-2015 | 24-May-2016 | 24-May-2016 | 17-Nov-2016 |
RRA Size: | ||||
RRA Shape: | planar | planar | planar | planar |
Reflectors: | 60 corner cubes | 60 corner cubes | 60 corner cubes | 60 corner cubes |
Size of Reflector: | 28.2 mm diameter, 19.1 mm height | 28.2 mm diameter, 19.1 mm height | 28.2 mm diameter, 19.1 mm height | 28.2 mm diameter, 19.1 mm height |
Orbit: | near-circular | near-circular | near-circular | near-circular |
Orbital period: | ||||
Inclination: | 56 degrees | 56 degrees | 56 degrees | 56 degrees |
Altitude: | 23,220 km | 23,220 km | 23,220 km | 23,220 km |
Eccentricity: | < 0.001 | < 0.001 | < 0.001 | < 0.001 |
Galileo-213 | Galileo-214 | Galileo-215 | Galileo-216 | |
Sponsor: | ESA | ESA | ESA | ESA |
Expected Life: | 12 years | 12 years | 12 years | 12 years |
Primary Applications: | Positioning | Positioning | Positioning | Positioning |
COSPAR ID: | 1606903 | 1606904 | 1707901 | 1707902 |
SIC Code: | 7213 | 7214 | ||
Satellite Catalog (NORAD) Number: | 41861 | 41862 | 43055 | 43056 |
PRN | E04 | E05 | E21 | E25 |
Launch Date: | 17-Nov-2016 | 17-Nov-2016 | 12-Dec-2017 | 12-Dec-2017 |
RRA Size: | ||||
RRA Shape: | planar | planar | planar | planar |
Reflectors: | 60 corner cubes | 60 corner cubes | 60 corner cubes | 60 corner cubes |
Size of Reflector: | 28.2 mm diameter, 19.1 mm height | 28.2 mm diameter, 19.1 mm height | 28.2 mm diameter, 19.1 mm height | 28.2 mm diameter, 19.1 mm height |
Orbit: | near-circular | near-circular | near-circular | near-circular |
Orbital period: | ||||
Inclination: | 56 degrees | 56 degrees | 56 degrees | 56 degrees |
Altitude: | 23,220 km | 23,220 km | 23,220 km | 23,220 km |
Eccentricity: | < 0.001 | < 0.001 | < 0.001 | < 0.001 |
Galileo-217 | Galileo-218 | Galileo-219 | Galileo-220 | |
Sponsor: | ESA | ESA | ESA | ESA |
Expected Life: | 12 years | 12 years | 12 years | 12 years |
Primary Applications: | Positioning | Positioning | Positioning | Positioning |
COSPAR ID: | 1707903 | 1707904 | 1806003 | 1806004 |
SIC Code: | 7217 | 7218 | 7219 | 7220 |
Satellite Catalog (NORAD) Number: | 43057 | 43058 | 43566 | 43567 |
PRN | E27 | E31 | E36 | E13 |
Launch Date: | 12-Dec-2017 | 12-Dec-2017 | 25-Jul-2018 | 25-Jul-2018 |
RRA Size: | ||||
RRA Shape: | planar | planar | planar | planar |
Reflectors: | 60 corner cubes | 60 corner cubes | 60 corner cubes | 60 corner cubes |
Size of Reflector: | 28.2 mm diameter, 19.1 mm height | 28.2 mm diameter, 19.1 mm height | 28.2 mm diameter, 19.1 mm height | 28.2 mm diameter, 19.1 mm height |
Orbit: | near-circular | near-circular | near-circular | near-circular |
Orbital period: | ||||
Inclination: | 56 degrees | 56 degrees | 56 degrees | 56 degrees |
Altitude: | 23,220 km | 23,220 km | 23,220 km | 23,220 km |
Eccentricity: | < 0.001 | < 0.001 | < 0.001 | < 0.001 |
Galileo-221 | Galileo-222 | Galileo-223 | Galileo-224 | |
Sponsor: | ESA | ESA | ESA | ESA |
Expected Life: | 12 years | 12 years | 12 years | 12 years |
Primary Applications: | Positioning | Positioning | Positioning | Positioning |
COSPAR ID: | 1806001 | 1806002 | 2111601 | 2111602 |
SIC Code: | 7221 | 7222 | 7223 | 7224 |
Satellite Catalog (NORAD) Number: | 43564 | 43565 | 49809 | 49810 |
PRN | E15 | E33 | E34 | E10 |
Launch Date: | 2018-07-25 | 2018-07-25 | 2021-12-05 | 2021-12-05 |
RRA Size: | ||||
RRA Shape: | planar | planar | planar | planar |
Reflectors: | 60 corner cubes | 60 corner cubes | 60 corner cubes | 60 corner cubes |
Size of Reflector: | 28.2 mm diameter, 19.1 mm height | 28.2 mm diameter, 19.1 mm height | 28.2 mm diameter, 19.1 mm height | 28.2 mm diameter, 19.1 mm height |
Orbit: | near-circular | near-circular | near-circular | near-circular |
Orbital period: | ||||
Inclination: | 56 degrees | 56 degrees | 56 degrees | 56 degrees |
Altitude: | 23,220 km | 23,220 km | 23,220 km | 23,220 km |
Eccentricity: | < 0.001 | < 0.001 | < 0.001 | < 0.001 |
Galileo-225 | Galileo-227 | |
Sponsor: | ESA | ESA |
Expected Life: | 12 years | 12 years |
Primary Applications: | Positioning | Positioning |
COSPAR ID: | 2407901 | 2407903 |
SIC Code: | 7225 | 7227 |
Satellite Catalog (NORAD) Number: | 59598 | 59600 |
PRN | E29 | E06 |
Launch Date: | 2024-04-28 | 2024-04-28 |
RRA Size: | ||
RRA Shape: | planar | planar |
Reflectors: | 60 corner cubes | 60 corner cubes |
Size of Reflector: | 28.2 mm diameter, 19.1 mm height | 28.2 mm diameter, 19.1 mm height |
Orbit: | near-circular | near-circular |
Orbital period: | ||
Inclination: | 56 degrees | 56 degrees |
Altitude: | 23,220 km | 23,220 km |
Eccentricity: | < 0.001 | < 0.001 |
Additional Information:
- ESA Galileo Home Page
- European Union Galileo Home Page
- GREAT: Galileo gravitational Redshift test with Eccentric sATellites
- Galileo for Science (G4S_2.0) SLR Campaign (2024)
- Galileosatellite metadata information
- IGS Multi GNSS Experiment (MGEX) constellation web page for Galileo
- Tour de l'IGS: "1st stop: Repro3 (IGS Reprocessing for ITRF2020) presentations (June 2, 2021)"
- Tour de l'IGS: "6th Stop: Galileo Constellation Spotlight (May 23, 2023)"
Publications:
- Falcone M., Hahn J., Burger T. (2017). "Galileo". In: Teunissen, P.J., Montenbruck, O. (eds) Springer Handbook of Global Navigation Satellite Systems. Springer Handbooks. Springer, Cham. doi: 10.1007/978-3-319-42928-1_9
- Bhattarai S., Ziebart M., Springer T. et al. (2022). "High-precision physics-based radiation force models for the Galileo spacecraft", Adv. Space Res., 69(12), 4141–4154, doi: 10.1016/j.asr.2022.04.003
- Chen G., Guo J., Gent T. and Zhao QL. (2023). "Multi-GNSS orbit combination at Wuhan University: strategy and preliminary products", J. Geodesy, 97(5), doi: 10.1007/s00190-023-01732-2
- Defraigne P., Pinat E., Petit G., Meynadier F. (2023). "Monitoring the offset between UTC and its prediction broadcast by the GNSS", Metrologia, 60(6), doi: 10.1088/1681-7575/ad0562
- Dell'Agnello S., Boni A., Cantone C. et al. (2016). "Thermo-optical vacuum testing of Galileo In-orbit Validation laser retroreflectors", Adv. Space Res., 57(11), 2347–2358, doi: 10.1016/j.asr.2016.03.025
- Delva P., Puchades N., Schönemann E. et al. (2018). "Gravitational redshift test using eccentric Galileo satellites", Phys. Rev. Lett., 121(23), doi: 10.1103/PhysRevLett.121.231101
- Duan B., Hugentobler U. (2022). "Estimating surface optical properties and thermal thrust for Galileo satellite body and solar panels", GPS Solutions, 26(135), doi: 10.1007/s10291-022-01324-1
- Gao F., Li XX, Zhang XH, Wang JL (2017). "Assessment of precise orbit and clock products for Galileo, BeiDou, and QZSS from IGS Multi-GNSS Experiment (MGEX)", GPS Solutions, 21(1), 279-250, doi: 10.1007/s10291-016-0523-3
- Kawate K., Igarashi Y., Yamada H. et al. (2023). "MADOCA: Japanese precise orbit and clock determination for GNSS", Adv. Space Res., 71(10), 3927–3950, doi: 10.1016/j.asr.2023.01.060
- Montenbruck O., Steigenberger P., Prange L. et al. (2017). "The Multi-GNSS Experiment (MGEX) of the International GNSS Service (IGS) – Achievements, prospects and challenges", Adv. Space Res., 59(7), 1671–1697, doi: 10.1016/j.asr.2017.01.011
- Prange L., Villager A., Sidorov D. et al. (2020). "Overview of CODE’s MGEX solution with a focus on Galileo", Adv. Space Res., 66(12), 2786–2798, doi: 10.1016/j.asr.2020.04.038
- Sośnica K., Zajdel R., Bury G. et al. (2020). "Quality assessment of experimental IGS multi-GNSS combined orbits", GPS Solutions, 24(2), doi: 10.1007/s10291-020-0965-5
- Steigenberger P., Thoelert S., Montenbruck O. (2018). "GNSS satellite transmit power and its impact on orbit determination", J. Geodesy, 92(6), 609–624, doi: 10.1007/s00190-017-1082-2
- Villager A., Dach R., Schaer S. et al. (2020). "GNSS scale determination using calibrated receiver and Galileo satellite antenna patterns", J. Geodesy, 94(9), doi: 10.1007/s00190-020-01417-0
- Zajdel R., Masoumi S., Sośnica K. et al. (2023). "Combination and SLR validation of IGS Repro3 orbits for ITRF2020", J. Geodesy, 97(87), doi: 10.1007/s00190-023-01777-3