Radar

Definition

Radar is a system that uses electromagnetic waves to detect, range (determine the distance of), and map objects such as aircraft, ships, and terrain. It operates by transmitting pulses of radio waves which are reflected back from the target object.

5 Must Know Facts For Your Next Test

1. Radar primarily uses radio waves within the microwave range of the electromagnetic spectrum.
2. The time delay between transmission and reception of the radar signal helps determine the distance to an object.
3. Radar systems can measure both the position and velocity of a target using the Doppler effect.
4. The strength and pattern of the reflected signal can provide information about the size, shape, and material properties of an object.
5. Atmospheric conditions can affect radar wave propagation, including phenomena like refraction and scattering.

Review Questions

• What part of the electromagnetic spectrum does radar typically use?
• How does radar determine the distance to an object?
• Describe one way in which atmospheric conditions can affect radar wave propagation.

Related terms

Electromagnetic Spectrum:

The range of all types of electromagnetic radiation, from radio waves to gamma rays.

Doppler Effect: A change in frequency or wavelength of a wave in relation to an observer moving relative to the source of the wave.

Refraction: The bending of a wave as it passes at an angle from one medium into another with different propagation speed.