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Radar Basics

Radar Basics

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The word RADAR is an acronym for RAdio Detection And Ranging. Radar employs electromagnetic propagation of energy directed toward and reflected from targets. Electromagnetic energy propagates in the atmosphere and free space in a straight line with propagation velocity c = 3 x 108 m/s, except for: Reflection from metallic objects and those having a dielectric constant different than that of free space. Reflection from targets is the basis for radar operation; reflection from terrain and other objects may interfere with radar operation: Refraction, the bending of the propagation path due to differences in the propagation velocity. Refraction due to the atmosphere and the ionosphere are common radar effects: Diffraction, the bending of the propagation path around the edge of an object. This effect is usually not significant at radar frequencies.

Chapter Contents:

  • 1.1 Radar Concept and Operation
  • 1.2 Radar Functions
  • 1.3 Types of Radars
  • 1.4 Frequency Bands
  • 1.5 Military Nomenclature
  • 1.6 Radar Configurations

Inspec keywords: permittivity; electromagnetic wave refraction; electromagnetic wave reflection; electromagnetic wave propagation; electromagnetic wave diffraction; radar

Other keywords: terrain; atmosphere; dielectric constant; radar operation; radio detection and ranging; refraction; diffraction; radar basics; electromagnetic propagation; free space; reflection; ionosphere; straight line; metallic objects; propagation velocity; electromagnetic energy; common radar effects

Subjects: Electromagnetic wave propagation; Radar equipment, systems and applications

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