Howtosignalprocessing
- What is beat frequency how it is used in FMCW radar?
- What's the difference between FMCW and CW radars?
- What is CW Doppler radar?
- How isolation between transmitter and receiver is provided in CW radar?
What is beat frequency how it is used in FMCW radar?
This frequency difference is called “beat frequency”. An occurring Doppler frequency would now move the frequency of the entire echo signal either up (moving towards the radar) or down (moving away from the radar). In this form of modulation, the receiver has no way to separate the two frequencies.
What's the difference between FMCW and CW radars?
The CW radar can measure the Doppler frequency of the target, but it cannot measure the target range. The frequency-modulated CW radar (FM–CW) can measure both the range and Doppler frequency of the target.
What is CW Doppler radar?
CW radar can measure the instantaneous rate-of-change in the target's range. This is accomplished by a direct measurement of the Doppler shift of the returned signal. The Doppler shift is a change in the frequency of the electromagnetic wave caused by motion of the transmitter, target or both.
How isolation between transmitter and receiver is provided in CW radar?
Isolation between transmitter and receiver might be obtained with a single antenna by using a hybrid junction, circulator, turnstile junction, or with separate polarizations. Separate antennas for transmitting and receiving might also be used.
