What is the doppler effect? How are the echoes from approaching target separated from the receding target? What will be the doppler frequency shift due to a receding target with velocity of 100ms-1 for a radar with carrier frequency of 1 ghz?
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Doppler effect is an increase (or decrease) in the frequency of sound, light, or other waves as the source and observer move towards (or away from) each other. The effect causes the sudden change in pitch noticeable in a passing siren, as well as the red shift seen by astronomers.
λO = λS(c − vS)/(c − vO)
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