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SNAP-1

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SNAP-1
Mission typeTechnology
OperatorSSTL /University of Surrey
COSPAR ID2000-033C[1]
SATCATno.26386Edit this on Wikidata
Spacecraft properties
ManufacturerSSTL /University of Surrey
Launch mass6.5 kilograms (14 lb)
Start of mission
Launch date28 June 2000, 12:13:00 (2000-06-28UTC12:13Z) UTC
RocketKosmos-3M
Launch sitePlesetsk132/1
Orbital parameters
Reference systemGeocentric
RegimeLow Earth
Perigee altitude666 kilometres (414 mi)
Apogee altitude682 kilometres (424 mi)
Inclination98.1 deg
Period98.2 minutes

SNAP-1 is a British nanosatellite inlow Earth orbit.[2][3] The satellite was built at the Surrey Space Centre bySurrey Satellite Technology Ltd (SSTL) and members of theUniversity of Surrey. It was launched on 28 June 2000 on board aKosmos-3M rocket from thePlesetsk Cosmodrome in northern Russia.[4] It shared the launch with a RussianNadezhda search and relay spacecraft and the Chinese Tsinghua-1 microsatellite.

Mission

[edit]

The objectives of the SNAP-1 mission were to:[2]

  • Develop and prove a modularcommercial off-the-shelf (COTS) based nanosatellite bus.
  • Evaluate new manufacturing techniques and technologies.
  • Image the Tsinghua-1 microsatellite during its deployment (timed to occur a few seconds after the deployment of SNAP-1).
  • Demonstrate the systems required for future nanosatellite constellations. For example: three-axis attitude control,Global Positioning System (GPS) based orbit determination, and orbital manoeuvres.
  • Depending on propellant availability, rendezvous with Tsinghua-1 and demonstrate formation flying.

During deployment, SNAP-1 successfully imaged the Nadezhda and Tsinghua-1 satellites that accompanied it on the launch.[5][6][7] Once in orbit, SNAP-1 achieved three axis attitude control,[8] then demonstrated its orbital maintenance capability using its butane cold gas propulsion system.[9]

Architecture

[edit]

The 6.5 kilograms (14 lb) SNAP-1 satellite contained the following modules:[10]

  • Power System[11]
  • VHF Receiver
  • S-band Transmitter[12]
  • Attitude and Orbit Control System (AOCS)[8]
  • Cold-Gas Propulsion (CGP) System[9]
  • On-Board Computer (OBC)
  • VHF spread-spectrum communications payload
  • UHF inter-satellite link
  • Machine Vision System (MVS)[5][6]

References

[edit]
  1. ^NASA,"SPACEWARN Bulletin", Number 560, 1 July 2000
  2. ^abC Underwood, G Richardson, J Savignol,"In-orbit results from the SNAP-1 nanosatellite and its future potential", Philosophical Transactions of The Royal Society, 2003
  3. ^P Fortescue, J Stark, G Swinerd, "Spacecraft Systems Engineering", Third Edition, Wiley - Section 18.7, pages 597-599
  4. ^"SSTL satellites launched on board Cosmos 3M booster", Flight International 4–10 July 2000, page 22
  5. ^abR Lancaster,"An optical remote inspection system for the Surrey Nanosatellite Applications Program", University of Surrey MSc thesis, 2001
  6. ^abR Lancaster, C Underwood,"The SNAP-1 Machine Vision System", 14th AIAA / USU Conference on Small Satellites, 2000
  7. ^"SpaceFlight News", Flight International 17–23 October 2000, page 33
  8. ^abW H Steyn, Y Hashida,"In-Orbit Attitude Performance of the 3-Axis Stabilised SNAP-1 Nanosatellite", 15th AIAA / USU Conference on Small Satellites, 2001
  9. ^abD Gibbon, C Underwood,"Low Cost Butane Propulsion Systems for Small Spacecraft", 15th AIAA / USU Conference on Small Satellites, 2001
  10. ^C Underwood, G Richardson, J Savignol,"SNAP-1: A Low Cost Modular COTS-Based Nano-Satellite – Design, Construction, Launch and Early Operations Phase", 15th AIAA / USU Conference on Small Satellites, 2001
  11. ^C Clark, K Hall, "Power System Design and Performance on the World’s Most Advanced In-Orbit Nanosatellite", 6th European Space Power Conference, Porto, Portugal May 2002
  12. ^Z Wahl, K Walker, J Ward,"Modular and Reusable Miniature Subsystems for Small Satellites: An Example Describing Surrey’s Nanosatellite S-Band Downlink", 14th AIAA / USU Conference on Small Satellites, 2000
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Launches are separated by dots ( • ), payloads by commas ( , ), multiple names for the same satellite by slashes ( / ).
Crewed flights are underlined. Launch failures are marked with the † sign. Payloads deployed from other spacecraft are (enclosed in parentheses).
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