Sampling

Fmcw radar sampling requirements

Fmcw radar sampling requirements
  1. What is sampling frequency in radar?
  2. How does FMCW radar estimate the distance?
  3. What is FMCW altimeter?

What is sampling frequency in radar?

At this stage they are referred to as video signals, and have a typical bandwidth in the range 250 KHz to 5 MHz. The Sampling Theorem therefore indicates sampling rates between about 500 KHz and 10 MHz. Such rates are well within the capabilities of modern analog-to-digital converters (ADCs).

How does FMCW radar estimate the distance?

FMCW radar systems measure the frequency difference (Δf, due to run time) between the transmitted and received echo signal for calculating the distance, and it also measures the Doppler frequency (due to the Doppler effect) for calculating the speed of the object.

What is FMCW altimeter?

The FM-CW radar principle is used in the aircraft radio altimeter to measure height above the surface of the earth. The large backscatter cross section and the relatively short ranges required of altimeters permit low transmitter power and low antenna gain.

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