Satellite Communications

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1 Satellite Communications Part IV-Lecture 5-Satellite Link Design Lecturer Madeeha Owais 1

2 Learning Objectives Solving calculations of Link Budget for various satellite systems 2

3 Calculate uplink transmitter power required to achieve (C/N) up =30 db Uplink Noise Power Budget k Ts= B=43.2 Noise Power=N dB 27.0dBK 76.4 dbhz dBW Total RF saturated bandwidth Received Power level at transponder input must be 30 db greater than noise power P r =power at transponder input=-95.2dbw Now establish uplink power budget Uplink Power Budget P t =Earth station transmitter power G t =Earth Station Antenna gain P t dbw 55.7 db G r =Satellite Antenna gain 31.dB L p= Free space loss dB L ant= E/S on 2dB contour loss L miscellaneous P r =Received power at the transponder -2.0dB -1.0dB P t db 3 HPA output 1 db attenuation Uplink Downlink 11.45

4 Total RF saturated bandwidth The required power at the transponder input to meet the (C/N) up =30dB objective is -95.2dBW P t db=-95.2dbw P t =28.3 dbw or 675 W HPA output 1 db attenuation Uplink Downlink

5 First step is to calculate the downlink (C/N) dn that will provide (C/N) o =17 db when (C/N) up =30 1/ (C/N) o =1/ (C/N) up +1/ (C/N) dn 1/ (C/N) dn =1/ (C/N) o +1/ (C/N) up 1/ (C/N) dn =1/50 +1/1000 =0.019 (C/N) dn =52.6 =17.2dB Total RF saturated bandwidth Find required input power to give (C/N) dn =17.2dB then find receiving gain Downlink Noise Power Budget k Ts= K=140 k B=43.2 Earth station Noise Power=N dB 21.5dBK 76.4 dbhz -13W HPA output 1 db Power level at earth station input must be 17.2 db greater then the noise power in clear P r = dBW+17.2 db= dbw attenuation Uplink Downlink

6 To calculate the downlink power budget Calculate path loss Calculate Power transmitted from the transponder P t is operated at 1dB,so is 1 db below P t =19dBW-1dB=18dBW Downlink Power Budget P t =Satellite 18.0W G t =Satellite gain G r =Earth station gain G r 31.0 db L p= Free space loss db L ant= E/S on -3dB contour loss L miscellaneous P r =Received power at the earth station -3.0dB -0.7dB G r dB Total RF saturated bandwidth HPA output Power required into E/S to meet (C/N) dn = 17.2 db is P r = dbw Hence G r is given as G r dB=-113.5dBW G r =46.7dB 6 1 db attenuation Uplink Downlink 11.45

7 Rain Effects at Ku Band(Assuming linear transponder) Uplink The uplink C/N was 30 db in Uplink path attenuation due to rain is 6 db Total RF saturated bandwidth Effect on uplink C/N The C/N in the transponder falls to 30-6=24dB Effect on downlink C/N The downlink C/N falls by 6 db from 17.2 db to 11.2dB Effect on Overall C/N Falls by 6 db i-e from 17dB to 11dB Minimum over C/N is set to Additional fade margin = db=1.5 db 7 HPA output 1 db attenuation Uplink Downlink 11.45

8 Rain Effects at Ku Band(Assuming linear transponder) Downlink Given in the paper Please see page 136 for solution Total RF saturated bandwidth Be careful about the two different approaches we have done in class ERRATA: Correction on page 135,Other are - and the inline Pr= dbw instead of dBW. Also Pr=Received power at earth station. In Rain effects at Ku band paragraph,correct transponder falls to 18-6=12dBW.On page 134,in downlink noise power budget N=Noise power at earth station in 8 HPA output 1 db attenuation Uplink Downlink 11.45

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