Computation of (GT) » History » Version 2
GAY, Adrien, 03/24/2015 11:19 AM
| 1 | 1 | GAY, Adrien | h1. Computation of (G/T) |
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| 2 | 1 | GAY, Adrien | |
| 3 | 1 | GAY, Adrien | From the expression of the link budget, we get: |
| 4 | 1 | GAY, Adrien | |
| 5 | 1 | GAY, Adrien | p=. $(\frac{G}{T})_{dB}=(\frac{E_{b}}{N0})_{dB}-10\cdot log_{10}(EIRP\cdot (\frac{\lambda}{4\cdot \pi\cdot R})^{2}\cdot\frac{1}{k\cdot R_{b}\cdot L_{marg}})$ |
| 6 | 1 | GAY, Adrien | |
| 7 | 1 | GAY, Adrien | With _Lmarg_ the only unknown which has to be evaluated in order to compute (G/T). |
| 8 | 1 | GAY, Adrien | |
| 9 | 1 | GAY, Adrien | An accurate evaluation of the margin can be tricky and is not the aim of this project. Then we just roughly evaluated it: |
| 10 | 1 | GAY, Adrien | * Depointing of the antennas: Ldep= 3dB + 3dB=6 dB |
| 11 | 1 | GAY, Adrien | * Non-ideal demodulator: Ldem= 3 dB |
| 12 | 1 | GAY, Adrien | * Atmosphere attenuation (clear sky conditions): Lprop= 1.5 dB |
| 13 | 1 | GAY, Adrien | * Interferences: Lint= 1.5 dB |
| 14 | 1 | GAY, Adrien | |
| 15 | 1 | GAY, Adrien | Then, we took _Lmarg= 12 dB_. However, the value of the margin can easily be modified for the simulations presented in _"Simulations and results"_ if needed. |