Answer Happy

Question 1. A L-band radar operates at a carrier of 1 GHz. It observes an aircraft moving through space in a straight line at a speed of 300 kmph. The aircraft approaches from the east, flies directly overhead of the radar at an altitude of 10 km, and continues to the west. Assume the radar antenna tracks the aircraft so it always appears in its beam. (a) Sketch the target's observed Doppler frequency as it flies from east to west through the airspace. Clearly label your plot. (b) Suggest a suitable pulse repetition frequency (PRF) for this radar. (c) Estimate the maximum approximation error for this scenario if the formula fa = −2v₁/λ is used instead of the full expression. (d) Determine the Doppler resolution if the radar uses bursts of 10 pulses, each of duration 50 ns, to measure Doppler shift. Use the PRF you suggested in part (b).