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Question 2. When using pulsed radars to measure Doppler shifts in targets, an ambiguity exists if the target Doppler shi
Posted: Thu Jun 02, 2022 8:46 am
by answerhappygod
- Question 2 When Using Pulsed Radars To Measure Doppler Shifts In Targets An Ambiguity Exists If The Target Doppler Shi 1 (67.89 KiB) Viewed 29 times
Question 2. When using pulsed radars to measure Doppler shifts in targets, an ambiguity exists if the target Doppler shift is greater than ±PRF/2. One possible way to get around this is to use multiple, "staggered" PRFs simultaneously (perhaps at different carrier frequencies). This generates multiple Doppler shift measurements, with the result being equivalent to a single PRF that is higher than any of the PRFs used. Consider one such radar with three PRFs: 15 kHz, 18,kHz and 21 kHz. Assume the operating carrier to be 10 GHz. (a) Calculate the Doppler shifts measured from each PRF used for a target moving at 580 m/s. (b) Another target generates Doppler shifts of -7 kHz, 2 kHz, and -4 kHz at the three PRFs, respectively. What can you say about the target's velocity? [2 marks]