# Doppler radar -Frequency variation

## Description

A Doppler radar is a specialized radar that makes use of the Doppler effect to produce velocity data about objects at a distance. It does this by beaming a microwave signal towards a desired target and listening for its reflection, then analyzing how the frequency of the returned signal has been altered by the object’s motion. (The Doppler effect (or Doppler shift) is the change in frequency of a wave (or other periodic event) for an observer moving relative to its source).

The formula for radar doppler shift is the same as that for reflection of light by a moving mirror.

## Variables

f_{d} | The Doppler frequency (Hz) |

v | The target velocity (m/s) |

f_{t} | The original frequency (Hz) |

c | Speed of light |