Downlink Overall Link Performance Figure below shows the geometry of the downlink. It is assumed that the receiving earth station is located on the edge of the 3 dB coverage area of the satellite receiving antenna carier The data are as follows: -Frequency: fo 12 GHz For the satellite (SL): edge of coverage nd typ.3dB) contour (CIN), = (EIRP) (1/L), (G/T) (1/k) Transmitting amplifier power: Prx=10W Loss between amplifier and antenna: Lyrx = 1 dB Transmitting beam half power angular width: 63dB = 2 Antenna efficiency: n = 0.55 -Earth station-satellite distance: R 40 000 km -Atmospheric attenuation: LA = 0.3 dB (typical attenuation by atmospheric gases at this frequency for an elevation angle of 2). For the earth station (ES): Receiver noise figure: F=1 dB Receiver loss Le (dB)=12()=0.6dB Loss between antenna and receiver: Lax = 0.5 dB Thermodynamic temperature of the feeder: T = 290 K Antenna diameter: D = 4m Antenna efficiency: n = 0.6 Maximum pointing error: 63db = 0.1 Ground noise temperature: TGROUND 45 K and Temperature of the Sky TSKY = 20 K 1) Calculate the EIRPs of the satellite taking into consideration the losses due to the earth station on edge of coverage L = 3 dB and Loss between amplifier and antenna Lyrx in dBW. 2) Calculate the attenuation of the downlink in dB, including the free space and atmospheric attenuations. 3) Calculate the figure of merit G/T of the earth station: (G/T)ES (GRmax/LRLFRXLPOL)/TD (K-1) Where the downlink system temperature is given by TD-TA/LFRX+TF(1-1/LFRX) +TeRX Here, TA=TSKY +TGROUND 4) Calculate the ratio C/No for the downlink