ASAR operates at a frequencyof 5.3GHz. Its satellite platformis 775kmabove the Earth’s surface and has a speed relative to the surface of 6.73 kms^-1. The swath width is 100 km
and the incidence angle at the centre of the swath is 23°. The along-track resolution is 30m. Estimate 

(i) The coherence time of the radiation transmitted by the radar, and 

(ii) The difference in two-way travel time between pulses reaching the near edge and the far edge of the swath. 

Use your answer to (ii) to show that the along-track resolution and the swath width do not conflict in this case. [Assume the Earth to be flat for simplicity.]