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High Angular-Resolution Techniques

High Angular-Resolution Techniques

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This chapter examines the synthesis and performance of one-dimensional (1D) and two-dimensional (2D) phased arrays and their application in sonar and radar before considering the elegant algorithms for Doppler beam sharpening and synthetic aperture radar (SAR) that can be used to produce a 'beam' with no divergence at all.

Chapter Contents:

  • 12.1 Introduction
  • 12.2 Phased Arrays
  • 12.2.1 Advantages of using Phased Arrays
  • 12.2.2 Array Synthesis
  • 12.2.3 Two Point Array
  • 12.2.4 4 Point Array
  • 12.2.5 The General Case
  • 12.3 The Radiation Pattern
  • 12.3.1 Linear Array
  • 12.3.2 Radiation pattern: 2D Rectangular Array
  • 12.4 Beam Steering
  • 12.4.1 Active and Passive Arrays
  • 12.4.2 Corrections to Improve Range Resolution
  • 12.5 Array Characteristics
  • 12.5.1 Antenna Gain and Beamwidth
  • 12.5.2 Matching and Mutual Coupling
  • 12.5.3 Thinned arrays
  • 12.5.4 Conformal Arrays
  • 12.6 Applications
  • 12.6.1 Acoustic Array
  • 12.6.2 New Generation MMIC Phased Arrays
  • 12.6.3 Early Warning Phased Array Radar
  • 12.7 Sidescan Sonar
  • 12.7.1 Operational Principles
  • 12.7.2 Hardware
  • 12.7.3 Operation and Image Interpretation
  • 12.7.4 Signal Processing
  • 12.8 Worked Example: Performance of the ICT-5202 Transducer
  • 12.9 Doppler Beam-Sharpening
  • 12.10 Operational Principles of Synthetic Aperture
  • 12.11 Range and Cross-range Resolution
  • 12.11.1 Unfocused SAR
  • 12.11.2 Focused SAR
  • 12.11.3 Resolution Comparison
  • 12.12 Worked Example: Synthetic Aperture Sonar
  • 12.13 Radar Image Quality Issues
  • 12.13.1 Perspective of a Radar Image
  • 12.13.2 Image Distortion
  • 12.13.2.1 Stretching
  • 12.13.2.2 Shadowing
  • 12.13.3 Speckle
  • 12.14 SAR on Unmanned Aerial Vehicles
  • 12.14.1 TESAR
  • 12.14.2 MiniSAR
  • 12.15 Airborne SAR Capability
  • 12.16 Space-based SAR
  • 12.16.1 Interferometry
  • 12.17 Magellan Mission to Venus
  • 12.18 References

Inspec keywords: Doppler radar; sonar; synthetic aperture radar; antenna phased arrays

Other keywords: synthetic aperture radar; two-dimensional phased arrays; elegant algorithms; high angular-resolution techniques; sonar; Doppler beam sharpening; one-dimensional phased arrays

Subjects: Sonar and acoustic radar; Antenna arrays

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