AEW Radar Concepts

AEW Radar Concepts

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The purpose of this paper is to address the capabilities and needs of airborne early warning (AEW) radar. Radar-earth-target geometry, with its associated problems of atmospheric refraction, attenuation, and multipath effects . Relative aircraft-earth-target velocities, with the associated Doppler-processing challenges . Restrictions on frontal area and weight that limit antennas to relatively small sizes, which thereby contribute to poor angular resolution and increased Doppler spreading, complex aircraft/antenna geometry, which contributes to larger antenna sidelobes and distortion of the main lobe . Jamming and other electromagnetic interference. AEW radars use two basic modes of operation: (1) the Doppler mode to detect moving aircraft over land and sea, and (2) the ordinary pulse or non-Doppler mode for detecting stationary or slow-moving targets such as boats or ships. The longrange Doppler detection mode, with its requirements made stringent by operating from a moving platform, distinguishes the AEW radar from others.

Chapter Contents:

  • 6.1 Introduction
  • 6.2 Basics of Airborne Doppler Radar
  • 6.2.1 Block Diagrams and Operation
  • 6.2.2 Radar-Earth-Target Geometry
  • 6.2.3 Doppler and the Effects of Aircraft Motion
  • 6.2.4 Atmospheric Losses
  • 6.2.5 System Noise and Losses
  • 6.2.6 Detection Requirements
  • 6.3 Selected Subsystems
  • 6.3.1 Antennas and Active Phased Arrays
  • 6.3.2 Transmitters and Receivers
  • 6.3.3 Receiver and Signal Processor Requirements
  • 6.3.4 Doppler Filters and Integrators
  • 6.3.5 Sidelobe Blankers, Cancellers, and Nulling Within the Main Beam
  • 6.3.6 CFARs and Automatic Target Detection
  • 6.4 AMTI and Pulse-Doppler Waveforms and Processing
  • 6.4.1 Ambiguities and Their Removal
  • 6.4.2 Doppler Spectra and Processing
  • 6.4.3 Low-, High-, and Medium-PRF Modes
  • 6.5 Clutter and Requirements for Suppression
  • 6.5.1 Main-Beam Clutter Levels
  • 6.5.2 Sidelobe Clutter
  • 6.5.3 Clutter Suppression Requirements
  • 6.5.4 Aspects of Clutter Suppression
  • 6.5.5 Maximum Clutter Suppression
  • 6.5.6 Automobiles and Other Nuisance Clutter
  • 6.6 Effects of Antenna Size and Frequency on S/N
  • 6.6.1 Volume Scanning
  • 6.6.2 Azimuth Scanning
  • 6.6.3 Dependence on Aperture Area and Fixed Frequency
  • 6.6.4 Examples for Azimuth Scan
  • 6.7 Choice of Radar Band
  • 6.8 Technology Issues

Inspec keywords: electromagnetic interference; interference suppression; object detection; electromagnetic wave refraction; geometry; Doppler radar; radar detection; radar antennas; airborne radar; jamming

Other keywords: stationary target detection; AEW radar; distortion; jamming; complex aircraft-antenna geometry; aircraft earth target velocity; Doppler detection mode; airborne early warning; atmospheric refraction; radar earth target geometry; multipath effect; atmospheric attenuation; radar antenna sidelobe; moving aircraft detection; nonDoppler detection mode; electromagnetic interference

Subjects: Electromagnetic compatibility and interference; Single antennas; Radar equipment, systems and applications; Electromagnetic wave propagation; Signal detection

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