In Radar SAR system Average transmitted power 395W The sola

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

Solution

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