In Radar SAR system Average transmitted power – 395W The solar array is of size
ID: 2323045 • Letter: I
Question
In Radar SAR system
Average transmitted power – 395W
The solar array is of size 5.25 m2, triple-junction GaAs type solar cells are used providing an average orbital power of 800 W EOL
SAR antenna dimensions: 4.78 m (long) x 0.75 m (width)
range = 1855.6 km
orbital velocity: 7.0942 Km/s
Imaging Mode: 1-meter; imaging time interval: 7.8 s
The Question:
If the antenna is changed by doubling the number of row and columns, the number of TR modules would be increased by a factor of 4, hence the power would be increased by a factor of 4. The antenna gain would also change, because of the increased antenna area (gain).What would the net effect be on the received power, by comparison to the same system but in a lower orbit with range = 618.5 Km ?
Answer the folowing:
Antenna area, a factor of : ____ times
Net change in power received: a factor of : ___ times
What would be the impact on required solar array power? (all other things being equal) _____ Watts
Explanation / Answer
The Question:
If the antenna is changed by doubling the number of row and columns, the number of TR modules would be increased by a factor of 4, hence the power would be increased by a factor of 4. The antenna gain would also change, because of the increased antenna area (gain).What would the net effect be on the received power, by comparison to the same system but in a lower orbit with range = 618.5 Km ?
Answer the folowing:
Antenna area, a factor of : ____ times
Net change in power received: a factor of : ___ times
What would be the impact on required solar array power? (all other things being equal) _____ Watts
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