Forward scatter radar

Forward scatter radar

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Forward scatter radar (FSR) is historically thought of as the first type of bistatic radar. Research on FSR has been predominantly focussed on its ability to serve as an electronic fence, and it has already proven the FSR's excellent detection and target motion parameter estimation capabilities. Recently, a wave of interest has emerged in FSR; first, this is a consequence of the introduction of `stealth' targets. These targets have a significantly reduced radar cross-section (RCS) because of their specific shapes and/or coatings which may greatly suppress backscattering, yet their shadows will still render them perfectly `visible' to FSR. Second, interest in FSR has appeared because of the establishment of passive coherent location concepts where illuminators of opportunity are used to form a bistatic radar network. This chapter provides an overview of FSR, theory and phenomenology and further discusses its capabilities and limitations.

Chapter Contents:

  • Abstract
  • 13.1 Introduction
  • 13.2 Radar topology and electromagnetic wave scattering mechanism
  • 13.2.1 Monostatic, bistatic and forward scatter radar topology
  • 13.2.2 Forward scatter cross-section
  • Target visibility time and Doppler resolution in FSR
  • 13.2.3 Target FSCS pattern
  • 13.3 Power budget, signature of moving target and optimal signal processing in FSR
  • 13.3.1 Power budget analysis
  • Free space propagation model
  • Power budget in two-ray path propagation model
  • 13.3.2 Target signature in FSR
  • Phase signature
  • The signature envelope
  • Examples of measured FSR signatures of real targets
  • 13.3.3 Optimal signal processing in FSR
  • Target motion parameter estimation
  • Convoy resolution
  • 13.4 Clutter in FSR
  • 13.4.1 Vegetation clutter
  • 13.4.2 Sea clutter
  • 13.5 Air target tracking in CW FSR
  • 13.5.1 Target resolution in forward scatter radar
  • 13.5.2 FSCS and coverage when tracking air target
  • 13.5.3 Mathematical model of measuring process. Maximum likelihood estimation of trajectory parameters
  • 13.5.4 Potential accuracy of trajectory parameters measurement
  • 13.5.5 Iterative algorithm of co-ordinate estimation
  • 13.5.6 Experimental tracking results
  • List of abbreviations
  • References

Inspec keywords: radar cross-sections; electromagnetic wave scattering; motion estimation

Other keywords: FSR; electronic fence; stealth targets; RCS; bistatic radar network; target motion parameter estimation; passive coherent location; radar cross-section; forward scatter radar; backscattering suppression

Subjects: Optical, image and video signal processing; Electromagnetic wave propagation; Radar theory

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