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Dorrie Byford Week 1: January 18 th , 2007

Dorrie Byford Week 1: January 18 th , 2007. Communications Group Leader / Autonomous Rendezvous Team Member / Website Designer Satellite Requirements and Autonomous Rendezvous Solutions. Satellites and Antennas. Satellites: Similar in size and capability to TDRSS Already in place

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Dorrie Byford Week 1: January 18 th , 2007

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  1. Dorrie ByfordWeek 1: January 18th, 2007 Communications Group Leader / Autonomous Rendezvous Team Member / Website Designer Satellite Requirements and Autonomous Rendezvous Solutions

  2. Satellites and Antennas • Satellites: Similar in size and capability to TDRSS • Already in place • Good Earth coverage • Has necessary bandwidth requirements • Already proven • Antennas: Similar in size and capability to ISS Ku-Band and S-band • Has required bandwidth • Already proven • Minimum 5 satellites required • Assumes use of current TDRSS • 3 Mars orbiting in 60 deg triangle • 2 in large, elliptical halo orbit relatively close to Earth • Ku-band and S-band antennas on every vehicle, man and unmanned

  3. Autonomous Rendezvous • Well proven • 1998/1999 • Future JAXA vehicles • Wide range • 500m – 2m • Minimum mass increase • Most capabilities already required • Software is basically mass-less

  4. Back-up Slides

  5. TDRSS Info

  6. Mars Orbiting Satellites

  7. Halo Orbit (view from Earth)

  8. HDTV Info • 1 HDTV channel = 270 Mpbs • Using MPEG-2 Encoding • 1 HDTV channel = 5-10 Mpbs • Satellites can send ~200 channels at once • Using MPEG-2 Encoding, 50 Mpbs (current Ku-band downlink rate) is more than enough

  9. S-Band • Shuttle specs: • Voice: 32 kbps • Commands: 8 kbps • Telemetry: 64 kbps • Forward link • High: 72 kpbs • Low: 32 kbps • Return link • High: 192 kpbs • Low: 96 kpbs

  10. Ku-Band • Same specs as S-band • Additional 50 Mpbs for video • Can be used as back-up system for rendezvous

  11. NASDA RVR • NASDA (now JAXA) created and tested Rendezvous Laser Radar (RVR) in late 90s • Tested on two-piece satellite • Named Chaser and Target • Multiple approaches from distances of 2 m to 12 km • Used GPS outside 500 m, RVR from 500 m to 2 m, and proximity operations inside 2 m

  12. RVR Results • All rendezvous performed successfully • RVR max error from 500 m – 2 m: .00372 m • RVR max error from 2 m – dock: .07 m • Specs of test satellite: • 2900 kg (both pieces combined) • Chaser: 12 m^3 • Target: 1.7 m^3

  13. Resources • http://www.daviddarling.info/encyclopedia/T/TDRSS.html • http://www.astronautix.com/craft/tdrs.htm • http://www.howstuffworks.com/satellite-tv2.htm • http://spaceflightnow.com/shuttle/sts092/status2.html • http://science.ksc.nasa.gov/shuttle/technology/sts-newsref/sts-ovcomm.html • Mokuno, Masaaki, Isao Kawano, Takashi Suzuki. “In-Orbit Demonstration of Rendezvous Laser Radar for Unmanned Autonomous Rendezvous Docking.” IEEE Transactions on Aerospace and Electronic Systems, April, 2004. Vol. 40, Issue 2, pp 617-626.

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