- #1
spacedude25
- 2
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Hello guys,
i got a task to design the ground station antenna. I need atleast to figure out G/T of the station. I looked at different link budget analysis, but could not find out how to calclate G/T of the antenna, or atleast how to assume this value. Usually G/T is given, but i got inverse task - to find G/T when everything else (well, almost everything) is provided. Satellite and channel parameters are given below:
Orbital altitude: 36 000 km
Inclination, Position: 0º, 30 º W
DL frequency: 20 GHz
UL frequency: 30 GHz
Polarization: UL: RHCP , DL: LHCP
Bandwidth, 3 channels: 143 MHz each
Modulation: QPSK
Minimum satellite EIRP: 54 dBW
Minimum SFD from satellite at ground stations: -100 dBW/m2
Maximum SFD from satellite at ground stations: -80 dBW/m2
Minimum satellite G/T: 6.7 dB/K
Can someone give a hint?
Thanks,
spacedude25
i got a task to design the ground station antenna. I need atleast to figure out G/T of the station. I looked at different link budget analysis, but could not find out how to calclate G/T of the antenna, or atleast how to assume this value. Usually G/T is given, but i got inverse task - to find G/T when everything else (well, almost everything) is provided. Satellite and channel parameters are given below:
Orbital altitude: 36 000 km
Inclination, Position: 0º, 30 º W
DL frequency: 20 GHz
UL frequency: 30 GHz
Polarization: UL: RHCP , DL: LHCP
Bandwidth, 3 channels: 143 MHz each
Modulation: QPSK
Minimum satellite EIRP: 54 dBW
Minimum SFD from satellite at ground stations: -100 dBW/m2
Maximum SFD from satellite at ground stations: -80 dBW/m2
Minimum satellite G/T: 6.7 dB/K
Can someone give a hint?
Thanks,
spacedude25