Transcription of Satellite Space Link Link-power Budget
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Satellite Space Link Link-power Budget
Satellite Space LinkSatellite Space LinkLinkLink--power Budgetpower BudgetSatellite system ParametersSatellite system Parameters11. Effective Isotropic Radiated Power (EIRP). Effective Isotropic Radiated Power (EIRP) A key parameter in link Budget is the A key parameter in link Budget is the equivalent/Effective isotropic radiated power:equivalent/Effective isotropic radiated power:[EIRP]=[Ps]+[G] dBW[EIRP]=[Ps]+[G] dBW[Ps][Ps]--the power at the antenna input (dBW)the power at the antenna input (dBW)[G] [G] Antenna Gain (dB)Antenna Gain (dB) Satellite system ParametersSatellite system Parameters11. Effective Isotropic Radiated Power (EIRP). Effective Isotropic Radiated Power (EIRP) For Parabolic Antennas with efficiency For Parabolic Antennas with efficiency == 73 , the gain can be approximated by:, the gain can be approximated by:G=G= (( 472 ffD)D)22 Where Where ff the operating frequency in GHzthe operating frequency in GHzD D Ant.
Satellite System Noise The RX power in a Sat. link is very small (couples of pW) amplification can be used to bring the signal strength up to an acceptable level. The main source of noise is the random thermal motion of electrons + thermal-like noise from antenna radiation The total noise power can be : PN KTNBN K-Boltzmans const. = 1.38x10-23J/K
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