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ARV, ELV and Total Communications

ARV, ELV and Total Communications. Zade Shaw 8 February 2005 Communications Group Docking Ad Hoc Committee D&C and Propulsions Interface Communications Liaison for the CTV and MLV. Problem: Need ARV and ELV Comm. http://www.decaturco.k12.in.us/space/spaceimages/sat5_as500f.jpg.

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ARV, ELV and Total Communications

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  1. ARV, ELV and Total Communications Zade Shaw 8 February 2005 Communications Group Docking Ad Hoc Committee D&C and Propulsions Interface Communications Liaison for the CTV and MLV

  2. Problem: Need ARV and ELV Comm. http://www.decaturco.k12.in.us/space/spaceimages/sat5_as500f.jpg

  3. Comm. Totals for Project Legend

  4. ELV Communications Plot

  5. CTV / MOS Communications Plot

  6. General References • Larson, Wiley J., & Pranke, Linda K. Human Spaceflight: Mission Analysis and Design, (pgs. 869-906). New York, US: McGraw Hill. • Larson, Wiley J., & Wertz, James R. (1999). Space Mission Analysis and Design, (pgs. 533-586). El Segundo, US: : Microcosm Press. • http://deepspace.jpl.nasa.gov/dsn/index.html • http://eis.jpl.nasa.gov/deepspace/dsndocs/810-005/ • http://www.fiber-optics.info/articles/dtv-hdtv.htm • http://www.triadtwcable.com/cableserv/images/SAHDTVFAQs.pdf • Jeri Metzger’s presentation was utilized for the picture on slide 2 of presentation 1

  7. Antenna Array References • http://www.emsstg.com/pdf/sar2.pdf • http://tmo.jpl.nasa.gov/progress_report/42-158/158D.pdf

  8. Data Compression References • http://www.data-compression.com/index.shtml • http://www.cs.bris.ac.uk/Research/Digitalmedia/vidcoding.html • http://www.informit.com/articles/article.asp?p=29249&seqNum=2 • http://www.computerworld.com/news/1999/story/0,11280,43440,00.html • http://www.bbc.co.uk/rd/pubs/papers/paper_14/paper_14.shtml • http://www.extremetech.com/article2/0%2C1558%2C53957%2C00.asp • http://www.engineerlive.com/cgi-bin/articles.pl?action=display&id=2219&subsection=405&t=1&section=11

  9. Deployable (first) and HDTV References • http://image.gsfc.nasa.gov/press_release/image_pr_20000526.html • http://csperkins.org/hdtv/

  10. Link Budget Zade Shaw 25 January 2005 Communications Team D&C and Propulsions Interface Docking Ad Hoc Committee Communications Lead for HAB

  11. The Problem: Video and Vast distances • HDTV Data Rate: 80 Mbps • Distance (long): 3.78 x 108 km • Key Issues: • Radio Band Selection • Signal to Noise Ratio http://deepspace.jpl.nasa.gov/dsn/gallery/goldstone.html

  12. Solution: Size & Power Required • Ka Band: high data transfer, low atmospheric loss • Ideal S/N = 3 dB • Transmission: • 115 kW • 12 m Dia. • 1500 kg • 2 m3 (internal)

  13. Calculations (for slide 2) • The 80 Mbps number comes from research (see references). It was discovered that it would take about 20 Mbps / HDTV and it was assumed that we would use 2 such connections each way. Hence, 80 Mbps. • The calculation of the 3.78*10^8 km was done in the Matlab script in the following way: • am = 2.27936636e8; semi-major axis Mars, km • ae = 1.49597807e8; semi-major axis Earth, km • S = am + ae; Earth-Mars Distance, km

  14. Calculations (for Slide 3) • Ka band and ideal S/N were chosen based on research (see references) • The power, diameter and mass were calculated using the attached MATLAB code. The primary sources for building this code were Professor Filmer’s lecture material and Human Spaceflight (see references). • The mass was calculated assuming a thin shelled (1cm thickness) hemisphere shape for the antenna and a material density for Aluminum 6061-T6, which was the material used for last year’s HOMER. • The internal volume of 2 cubic meters was an estimated based on last year’s HOMER value of 1.3 cubic meters.

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