Frequency Shift

Frequency shift refers to the change in frequency of a signal due to the relative motion between the source of the signal and the observer. In space and astronautical engineering, frequency shift is an important concept in communication systems, especially in satellite communication. The Doppler effect is the most common cause of frequency shift in space communication. It occurs when the distance between the satellite and the ground station changes due to the relative motion of the two. This causes a shift in the frequency of the signal transmitted by the satellite, which can affect the quality of the communication. Frequency shift is also important in remote sensing applications, where it is used to measure the velocity of objects in space.
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