key term - Radar

Definition

Radar (Radio Detection and Ranging) is a system that uses radio waves to detect, range, and map objects. It operates by transmitting radio waves and analyzing the echoes that return from objects.

5 Must Know Facts For Your Next Test

1. Radar systems use electromagnetic waves in the radio or microwave part of the spectrum.
2. The basic principle of radar involves sending out a pulse of radio waves and measuring the time it takes for the echo to return.
3. Doppler radar can measure the velocity of an object by observing changes in frequency of the returned signal due to the Doppler effect.
4. Radar cross-section is a measure of how detectable an object is with radar; it depends on size, shape, material, and orientation.
5. Radar technology is widely used in various fields including aviation, maritime navigation, weather forecasting, and military applications.

Review Questions

Related terms

Electromagnetic Spectrum: The range of all types of electromagnetic radiation, including radio waves, microwaves, infrared light, visible light, ultraviolet light, X-rays, and gamma rays.

Doppler Effect:

A change in frequency or wavelength of a wave in relation to an observer who is moving relative to the wave source.

Microwaves:

A type of electromagnetic radiation with wavelengths ranging from one meter to one millimeter; commonly used in radar systems.