Link Power Budgetting : Downlink Path Loss Calculation In Satellite Communication
Link Power Budgetting
7.Calculation of Downlink path loss
1. Down Link frequency Down link frequency is frequency at which satellite is communicating with ground station. For C band up link frequency is in the order of 4 G Hz , 12 G Hz for Ku band.
2. Downlink path loss Down link path loss depend on up link frequency & distance between satellite and ground station.
Here,
'd' is the distance between satellite & ground station
'f' is the frequency of the down link wave
'C' is the velocity of the light = 3 x108 m/Sec
Here f is in Giga hertz
Example : calculate downlink path loss for the satellite located 37000 km far from the earth station and operating 3,950 GHz frequency
Solution:
Down link loss = 20 log (4pd/(3/10*f)
= 195.73 dB
