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COSMO-SkyMed

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COSMO-SkyMed
COSMO-SkyMed flare
A COSMO-SkyMed flare above the UK
ManufacturerThales Alenia Space
Country of originItaly
OperatorASI
ApplicationsEarth observationradar
Websitehttp:// cosmo-skymed.it/it/index.htm
Specifications
BusPRIMA
Launch mass1,700 kg (3,700 lb)[1]
Power4kW
RegimeSun-synchronous orbit
Design life5 years (planned)
Production
StatusOperational
On order4
Built4
Launched4
Operational4
Maiden launchCOSMO-1
23 June 2007, 02:34:00UTC
Last launchCOSMO-4
5 November 2010, 02:20:03 UTC
COSMO-SkyMed Second Generation
ManufacturerThales Alenia Space
Country of originItaly
OperatorASI
ApplicationsEarth observationradar
Websitehttp:// cosmo-skymed.it/it/index.htm
Specifications
BusPRIMA
Launch mass2,205 kg (4,861 lb)[2]
Power5kW
RegimeSun-synchronous orbit
Design life7 years (planned)
Production
StatusOperational
On order4
Built2
Launched2
Operational1
Maiden launchCSG-1
18 December 2019, 08:54 UTC

COSMO-SkyMed(COnstellation of small Satellites for the Mediterranean basin Observation) is anEarth-observation satellitespace-based radarsystem funded by theItalian Ministry of ResearchandMinistry of Defenceand conducted by theItalian Space Agency(ASI), intended for both military and civilian use.[3]The prime contractor for the spacecraft wasThales Alenia Space.COSMO SkyMed is aconstellationof four dual useIntelligence, surveillance, target acquisition, and reconnaissance(ISR)Earth observation satelliteswith asynthetic-aperture radar(SAR) as main payload, the result of the intuition ofGiorgio Perrottain the early nineties. The synthetic-aperture radar was developed starting in the late nineties with the SAR 2000 program funded by ASI.

The space segment of the system includes four identical medium-sized 1,700 kg (3,700 lb) satellites calledCOSMO-SkyMed(orCOSMO)1,2,3,4,equipped with synthetic-aperture radar (SAR) sensors with global coverage of the planet.[4]Observations of an area of interest can be repeated several times a day in all-weather conditions. The imagery is applied to defense and security assurance inItalyand other countries, seismic hazard analysis,environmental disastermonitoring, and agricultural mapping.[5]

COSMO-SkyMed first generation[edit]

The four satellites are inSun-synchronouspolar orbitswith a 97.90°inclinationat a nominalaltitudeof 619 km (385 mi) and anorbital periodof 97.20 minutes. The local time ascending node at theequatoris 06:00. The operating life of each satellite is estimated to be 5 years. Each satellite repeats the sameground trackevery 16 days. They cross the equator at approximately 06:00 and 18:00 local-time each day and can image any point twice each day. The satellites are phased in the same orbital plane, with COSMO-SkyMed's 1, 3, and 2 at 90° intervals followed by COSMO-SkyMed 4 at 67.5° after COSMO-SkyMed 2. The offset of satellite 4 allows a one-day interferometry mode for elevation information.[6]The Sun-synchronous orbit (SSO) is used due to power (Electrical Power Subsystem) andrevisit timerequirements.

The satellites' main components are:

The radar antenna is a phased array that is 1.4 × 5.7 m (4 ft 7 in × 18 ft 8 in). The system is capable of both single- and dual-polarization collection. The center frequency is 9.6GHzwith a maximum radar bandwidth of 400MHz.[7]

List of launches[edit]

United Launch Allianceprovided launch services for the satellites with theirDelta II7420-10C launch vehicles fromVandenberg Air Force Base.[8]Satellite processing for the first two satellites was handled by the Astrotech Space Operations subsidiary ofSPACEHAB.[5]The first satellite COSMO-1 (COSPAR 2007-023A) was launched at 02:34:00UTCon 8 June 2007.[9]COSMO-2 (COSPAR 2007-059A) was launched at 02:31:42 UTC on 9 December 2007,[10]the launch having been delayed from 6 December 2007 due to bad weather, and problems with the rocket's cork insulation. COSMO-3 (COSPAR 2008-054A) launched at 02:28 UTC on 25 October 2008. COSMO-4 (COSPAR 2010-060A) launched on 6 November 2010, at 02:20 UTC.[11]

Flight No. Date/Time (UTC) Launch site Launch vehicle Payload Outcome
1 8 June 2007, 02:34:00 VAFB,SLC-2W Delta II7420-10 COSMO-1 Success
2 9 December 2007, 02:31:42 VAFB,SLC-2W Delta II7420-10 COSMO-2 Success
3 25 October 2008, 02:28:25 VAFB,SLC-2W Delta II7420-10C COSMO-3 Success
4 6 November 2010, 02:20:03 VAFB,SLC-2W Delta II7420-10C COSMO-4 Success

Ground segment[edit]

Theground segmentof the system is composed of:

The governments ofArgentinaandFranceare involved respectively in the civil and military segments of the system.

SAR capabilities[edit]

The COSMO-SkyMed satellites have three basic types of imaging modes:

  • Spotlight, a high-resolution mode collected over a small area by steering the radar beam slightly fore-to-aft during the collection period
  • Stripmap, a medium-resolution mode collected over long, continuous swaths in which the beam is pointed broadside to the satellite track
  • ScanSAR, a low-resolution mode that creates extra-wide swaths by collecting short segments at different ranges and then mosaicking them together

There are two Spotlight modes:

  • SPOTLIGHT1, which is a military-only mode, and
  • SPOTLIGHT2, which provides a resolution of 1 m (3 ft 3 in) over a 10 × 10 km (6.2 × 6.2 mi) area. Spotlight polarization is limited to either HH or VV

There are two Stripmap modes:

  • HIMAGE, which provides a resolution of between 3 and 5 m (9.8 and 16.4 ft) over a swath of 40 km (25 mi), and
  • PINGPONG, which collects dual-polarization data at 15 m (49 ft) resolution over a swath of 30 km (19 mi). The dual-polarization data can consist of any two polarizations (HH, VV, VH, HV), and it is non-coherent, as it is collected in "pulse groups" that alternate from one polarization to the other.

There are two ScanSAR modes:

  • WIDEREGION, which provides 30 m (98 ft) resolution data over a swath of 100 km (62 mi), and
  • HUGEREGION, which provides 100 m (330 ft) resolution data over a swath of 200 km (120 mi).

The system is sized to collect up to 450 images per satellite per day.[12]

Commercialization[edit]

e-GEOS, S.p.A.,a joint venture between European spaceflight services companyTelespazio(80%) and the Italian Space Agency (ASI) (20%), has the exclusive worldwide commercial rights to sell COSMO-SkyMed data and products.[13][12]

Flares[edit]

The COSMO-SkyMed satellites are lesser-known deliverers ofsatellite flares,sometimes approaching magnitude −3. Flares come mainly from SAR-panels of the satellites. Although overshadowed by theIridium satellites,the flares are often long-lasting, with the satellites traversing much of the sky at brighter-than-average magnitudes.

COSMO-SkyMed second generation (CSG)[edit]

To replace the first COSMO-SkyMed constellation, the Italian Space Agency is developing the COSMO-SkyMed second generation constellation. The 2nd generation constellation has the same function of radar-basedEarth observationwith particular focus on theMediterranean areaas the 1st generation. Like the 1st generation, the 2nd generation also consists of 4 satellites,CSG-1,CSG-2,CSG-3andCSG-4.The satellites are improved versions of the first generation satellites. Also the radar payload CSG-SAR (COSMO-SkyMed Second Generation Synthetic Aperture Radar) is an improved version of the first generationX-bandSAR payload. Furthermore, the 2nd generation satellites will operate in the same orbit (indeed, in the same orbital plane) as the first generation satellites. The 2nd generation satellites slightly outweigh the first generation satellites at 2,205 kg (4,861 lb) of mass.[14]

The contract for building two satellites was signed in September 2015. In December 2020, another two satellites were ordered. The satellites are built byThales Alenia Space(the successor company ofAlenia Spazio). They have a planned lifetime of 7 years. CSG-1 was launched on 18 December 2019 bySoyuz ST-AfromCentre spatial Guyanais(CSG). CSG-2 was launched on 31 January 2022 byFalcon 9 Block 5fromSpace Launch Complex 40atCape Canaveral Space Force Station,[15]while the CSG-3 satellite is scheduled to be launched in 2024 on aVega-Claunch vehicle.[16]

List of launches[edit]

Flight No. Date/Time (UTC) Launch site Launch vehicle Payload Outcome Notes
1 18 December 2019, 08:54:20 Kourou,ELS Soyuz ST-A/Fregat-MT CSG-1 Success On 18 January 2021, COSMO-SkyMed Second Generation-1 (CSG-1) became operational with the first of four satellites.[17]
2 31 January 2022, 23:11:14 CCSFS,SLC-40 Falcon 9 Block 5♺
B1052.3[18] 		CSG-2 Success On 31 January 2022, SpaceX launched COSMO-SkyMed Second Generation FM2 mission tolow Earth orbitfrom Space Launch Complex 40 (SLC-40) atCape Canaveral Space Force StationinFlorida.
3 2025 Kourou,ELV Vega-C CSG-3 Planned
4 2027? Kourou,ELV Vega-C CSG-4 Planned

See also[edit]

  • SAOCOM,two Argentine SAR-satellites that are part of the SIASGE constellation alongside COSMO-SkyMed.
  • SAR Lupe,a system of five military SAR-satellites ofGermany.

References[edit]

  1. ^"COSMO-SkyMed (Constellation of 4 SAR Satellites)".eoportal.org.Retrieved26 November2020.
  2. ^"COSMO-SkyMed Second Generation (CSG) Constellation".eoportal.org.Retrieved26 November2020.
  3. ^"COSMO-SkyMed: Mission definition and main applications and products"(PDF).ESA.
  4. ^"COSMO-SkyMed".Telespazio. Archived fromthe originalon 8 July 2007.
  5. ^ab "SPACEHAB Subsidiary Signs New Contracts Totaling US$4.7 million".SPACEHAB.
  6. ^"COSMO-SkyMed Mission and Products Description 23/01/2019".e-geos.my.salesforce.Italian Space Agency.Retrieved24 August2020.
  7. ^"COSMO-SkyMed User Guide"(PDF).ASI. Archived fromthe original(PDF)on 29 August 2017.Retrieved8 November2012.
  8. ^"Boeing To Launch Fourth EO Satellite For Italy".SpaceDaily.23 December 2008.
  9. ^"Worldwide launch schedule".Spaceflight Now. Archived fromthe originalon 11 September 2013.
  10. ^NASA Spaceflight – Delta II launches with COSMO-SkyMed-2Archived8 December 2007 at theWayback Machine
  11. ^"COSMO 1, 2, 3, 4".Gunter's Space Page. 7 July 2020.Retrieved12 October2021.
  12. ^ab"eGEOS: COSMO-SkyMed Overview".eGEOS. Archived fromthe originalon 22 July 2013.Retrieved10 August2011.(subscription required)
  13. ^"E-GEOS to Create Early Warning System for Caribbean Weather Emergencies".satellitetoday.18 December 2018.Retrieved23 August2019.
  14. ^"CSG 1, 2, 3, 4 (COSMO-SkyMed 2nd Gen.)".Gunter's Space Page. 3 October 2021.Retrieved12 October2021.
  15. ^"Falcon 9 finally launches with Italian CSG-2 Earth observation satellite".NASASpaceflight. 31 January 2022.Retrieved1 February2022.
  16. ^"COSMO-SKYMED".Italian Space Agencydate. 3 October 2021.Retrieved3 October2021.
  17. ^"COSMO-SkyMed".Agenzia Spaziale Italiana. 12 October 2021.Retrieved12 October2021.
  18. ^"CSG-2 | Falcon 9 Block 5".25 January 2022.

External links[edit]

Wikimedia Commons has media related toCOSMO-SkyMed.
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