Doppler shift in time domain?

1. What is delay Doppler domain?
2. What does a Doppler shift indicate?
3. How does a time shift affect frequency domain?
4. What are the two types of Doppler shift?

What is delay Doppler domain?

When used in wireless communication, the Delay Doppler domain mirrors the geometry of the reflectors comprising the wireless channel, which changes far more slowly than the phase changes experienced in the rapidly varying time-frequency domain.

What does a Doppler shift indicate?

The Doppler effect, or Doppler shift, describes the changes in frequency of any kind of sound or light wave produced by a moving source with respect to an observer. Waves emitted by an object traveling toward an observer get compressed — prompting a higher frequency — as the source approaches the observer.

How does a time shift affect frequency domain?

Apparently, a shift in the time domain corresponds to a phase rotation in the frequency domain. In particular, when the time-shift equal 1s (or in general: t0), the period of the phase rotation in frequency domain amounts 1Hz (or in general 1/t0Hz).

What are the two types of Doppler shift?

In Doppler mode, the Doppler frequency shift of moving objects (described earlier) is used for image formation in the form of color or spectrum. There are two different types of Doppler modes: pulsed wave and continuous for specific clinical application.