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Target-reflectivity theory for coherent laser radars.

J H Shapiro1

  • 1Massachusetts Institute of Technology, Department of Electrical Engineering & Computer Science, Cambridge Massachusetts 02139, USA.

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|April 17, 2010
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Summary
This summary is machine-generated.

This study introduces a two-frequency bistatic scattering-amplitude matrix for coherent laser radar target characterization. This matrix helps develop target signatures for imaging systems and explores reflectivity models for rough surfaces.

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Area of Science:

  • Optics and Photonics
  • Radar Systems Engineering
  • Electromagnetics

Background:

  • Coherent laser radars require robust target characterization methods.
  • Existing target models like bidirectional reflectance and diffuse reflectivity have limitations.
  • Accurate target signatures are crucial for imaging system performance.

Purpose of the Study:

  • To establish a general target characterization for coherent laser radars using a two-frequency bistatic scattering-amplitude matrix.
  • To develop target-signature expressions for pulsed and 3-D imaging systems.
  • To investigate the relationship between the scattering matrix and conventional reflectivity models.

Main Methods:

  • Formulation of the two-frequency bistatic scattering-amplitude matrix.
  • Development of target-signature expressions based on the scattering matrix.
  • Analysis of relationships between scattering matrix and bidirectional reflectance, diffuse reflectivity, and multiplicative models.
  • Experimental measurements using a test bed and calibration plates.

Main Results:

  • The two-frequency bistatic scattering-amplitude matrix provides a comprehensive target characterization.
  • Target-signature expressions were derived for pulsed and 3-D imagers.
  • The study clarifies the connection between the scattering matrix and established reflectivity models.
  • Calibration-plate data demonstrate the potential of diffuse reflectivity for rough-surface targets.

Conclusions:

  • The scattering-amplitude matrix is a powerful tool for coherent laser radar target characterization.
  • This framework enhances the development of target signatures for advanced imaging systems.
  • Diffuse reflectivity shows promise for characterizing rough-surface targets in radar applications.