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Link Budgets

Version 8 (J. Simmons, 05/15/2016 12:41 pm)

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h1. Link Budget References
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{{>toc}}






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h2. Background Material






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* "Link Budget Calculation":http://www.piscespacific.org/livesite/files/Link_Budget_Calculation.pdf






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* "Tutorial on Basic Link Budget Analysis":http://www.sss-mag.com/pdf/an9804.pdf






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* [[Link Budget Video Tutorials]] by Aaron Harper, Mach 30 volunteer






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h2. Example Calculations






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Much of this material was reviewed with the stakeholders and the IPT at the "Sprint 1 Stand Up 3 meeting":https://docs.google.com/document/d/17Wc4sMqlUissR5am6ANDcKP-psRQ41ysxOV0vrcgHJA/pub






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h3. Online Forms






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Online forms are useful for one off calculations, source code/math not necessarily available to Mach 30.






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* "Satellite Link Budget Calculator":http://www.satsig.net/linkbugt.htm - simple online form for uplink and downlink calculations






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* "Satellite Link Budget Calculator page":http://www.tutorialsweb.com/satcom/satellite-link-budget-calculator.htm - a mor complete set of calculations for uplink and downlink






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* "Geostationary Satellite Link Budget Calculations (Downlink)":http://www.satcom-services.com/VSAT/downlink.html - Geo calculations, not really useful for us, but nice user experience






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h3. Spreadsheets 






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Spreadsheets require the correct software to run (typically MS Excel), but Mach 30 can investigate the implementation to use as a source for porting to Python library.






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* "KickSat Ground Station Link Budget":https://github.com/kicksat/groundstation/blob/master/Link%20Budgets.xlsx (MS Excel) - just about the right level of detail for current work (not surprising since KickSat has a similar level of technical complexity and available technical resources as Ground Sphere)






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* "Jan King's AMSAT link budget":http://www.amsatuk.me.uk/iaru/AMSAT-IARU_Link_Model_Rev2.5.3.xls (MS Excel) - the most extensive calculations, too much detail for now, but will likely be useful for future projects






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* "KA9Q JJSat link budget design spreadsheet":http://www.ka9q.net/jjsat/full_links.xls (MS Excel) - another set of right sized calculations for our current needs (came from "conceptual design work for JJSat":http://www.ka9q.net/jjsat/)






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* "ConaSat Link Budget Calculations for DTUSat":http://www.crn2.inpe.br/conasat1/projetos_cubesat/projetos/DTUSat%20-%20Technical%20University%20of%20Denmark%20-%20Denmark/DTUSat%20-%20COM%20-%20Link%20Budget.xls (MS Excel) - the history of this spreadsheet is a little unclear, but it is a very clean implementation of the required calculations






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h2. Video Tutorials






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These vidoes are proof of concept video tutorials, and will be replaced with a more polished version as time permits.






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h3. Part 1 - Intro to Satellite Link Budgets






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h3. Part 2 - Transmission Segment






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h3. Part 3 - Trigonometry Refresher






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h3. Part 4 - Propagation Loss






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h3. Part 5 - Ground Segment






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h3. Part 6 - Putting It All Together






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h3. Part 7 - Software Solutions






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h2. Selected Link Budget Source Document






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The Ground Sphere Mk 3 team has decided to build its Python Link Budget library on the calculations used in the "KickSat Ground Station Link Budget":https://github.com/kicksat/groundstation/blob/master/Link%20Budgets.xlsx.  This spreadsheet includes nearly all of the required transmission effects and has been verified by "comparing its results to manual calculations":http://opendesignengine.net/dmsf_files/523?download=.