SATCOM Link Budgets
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This document discusses satellite link budgets and calculating the power required to transmit a signal from a geosynchronous satellite to a receiver on Earth. It provides an example of calculating the power needed to transmit a 10GHz signal from a GEO satellite with a 30dB transmitter gain and receive the signal at Earth with a 40dB receiver gain, achieving a received power of -116dBW accounting for a distance of 36,000km and 5dB of additional losses. The document also references resources on satellite communications tutorials and link budget software.
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SATCOM Link Budgets
- 1. M.A. Vázquez Castro David Fernández Piñas Aplicaciones Multidisciplinares I 1 SATCOM Link budgets
- 2. M.A. Vázquez Castro David Fernández Piñas Aplicaciones Multidisciplinares I Link Budgets 2 RECEIVED POWER CALCULATION Calculate the power that must be transmitted from a GEO satellite to have a power of -116dBW (2.5 ×10-21 W) at a receiver on the earth. Assume f=10GHz, Rx antenna gain (GR) = 40 dB, Tx Satellite antenna gain (GT) = 30dB and additional losses of 5dB. R = altitude = 36000 km
- 3. M.A. Vázquez Castro David Fernández Piñas Aplicaciones Multidisciplinares I Link Budgets 3
- 4. M.A. Vázquez Castro David Fernández Piñas Aplicaciones Multidisciplinares I Link Budgets 4 Ref.: J P Silver, Satellite Communications Tutorial, RF, RFIC & Microwave Theory, Design. www.rfic.co.uk
- 5. M.A. Vázquez Castro David Fernández Piñas Aplicaciones Multidisciplinares I Link Budgets 5 SATMASTER Demo GEO bent pipe
- 6. M.A. Vázquez Castro David Fernández Piñas Aplicaciones Multidisciplinares I Link Budgets 6 SATMASTER Demo Forward link budget GEO bent pipe DVB-S2 Ku band Uplink
- 7. M.A. Vázquez Castro David Fernández Piñas Aplicaciones Multidisciplinares I Link Budgets 7 SATMASTER Demo GEO bent pipe Online Help Parameters explanation
- 8. M.A. Vázquez Castro David Fernández Piñas Aplicaciones Multidisciplinares I Link Budgets 8 SATMASTER Demo Forward link budget GEO bent pipe DVB-S2 Ku band Downlink
- 9. M.A. Vázquez Castro David Fernández Piñas Aplicaciones Multidisciplinares I Link Budgets 9 SATMASTER Demo EUTELSAT HOTBIRD 13E (13C) Downlink Coverage EIRP (saturation) = 51 dBW @Madrid http://www.eutelsat.com/en/satellites/the-fleet/EUTELSAT-HB13C-downlink-coverage.html
- 10. M.A. Vázquez Castro David Fernández Piñas Aplicaciones Multidisciplinares I Link Budgets 10 SATMASTER Demo EUTELSAT HOTBIRD 13E (13C) Uplink Coverage G/T receive = 4 dB/K @Barcelona http://www.eutelsat.com/en/satellites/the-fleet/EUTELSAT-HB13C-uplink-coverage.html
- 11. M.A. Vázquez Castro David Fernández Piñas Aplicaciones Multidisciplinares I Link Budgets 11 SATMASTER Demo Forward link budget GEO bent pipe DVB-S2 Ku band Satellite
- 12. M.A. Vázquez Castro David Fernández Piñas Aplicaciones Multidisciplinares I Link Budgets 12 SATMASTER Demo Forward link budget GEO bent pipe DVB-S2 Ku band Carriers QPSK ¾ Eb/No: PER QEF 10-8 Underuse Tx Power
- 13. M.A. Vázquez Castro David Fernández Piñas Aplicaciones Multidisciplinares I Link Budgets 13 SATMASTER Demo Forward link budget GEO bent pipe DVB-S2 Ku band Adjacent Satellite Uplink Interference
- 14. M.A. Vázquez Castro David Fernández Piñas Aplicaciones Multidisciplinares I Link Budgets 14 SATMASTER Demo Forward link budget GEO bent pipe DVB-S2 Ku band Adjacent Satellite Downlink Interference
- 15. M.A. Vázquez Castro David Fernández Piñas Aplicaciones Multidisciplinares I Link Budgets 15 SATMASTER Demo Forward link budget GEO bent pipe DVB-S2 Ku band Rain fading ITU-R Dual fading if correlated area
- 16. M.A. Vázquez Castro David Fernández Piñas Aplicaciones Multidisciplinares I Link Budgets 16 SATMASTER Demo Input parameters summary
- 17. M.A. Vázquez Castro David Fernández Piñas Aplicaciones Multidisciplinares I Link Budgets 17 SATMASTER Demo Computation of elevation, azimuth, slant range, delay…
- 18. M.A. Vázquez Castro David Fernández Piñas Aplicaciones Multidisciplinares I Link Budgets 18 SATMASTER Demo Uplink and downlink C/N computation Downlink C/N(thermal) dominates
- 19. M.A. Vázquez Castro David Fernández Piñas Aplicaciones Multidisciplinares I Link Budgets 19 SATMASTER Demo % Tpdr. power used is too high!
- 20. M.A. Vázquez Castro David Fernández Piñas Aplicaciones Multidisciplinares I Link Budgets 20 SATMASTER Demo Proposal to reduce power: use QPSK ½ instead of QPSK ¾
Editor's Notes
- Class: Jan-18-2001