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Direction Finding and Interferometer Analysis

Direction Finding and Interferometer Analysis

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Direction finding is a method to determine the direction of a transmitted signal by using two antennas and measuring the phase difference between the antennas, as shown in Figure 12-1. This process is called interferometry. In addition to using a static interferometer, further analysis needs to be done to calculate the direction when the interferometer baseline is dynamic; that is, the interferometer is moving and rotating in a three-dimensional plane. Thus coordinate conversion processes need to be applied to the nonstabilized antenna baseline to provide accurate measurement of the direction in a three-dimensional plane.

Chapter Contents:

  • 12.1 Interferometer Analysis
  • 12.2 Direction Cosines
  • 12.3 Basic Interferometer Equation
  • 12.4 Three-Dimensional Approach
  • 12.5 Antenna Position Matrix
  • 12.6 Coordinate Conversion Due to Pitch and Roll
  • 12.7 Using Direction Cosines
  • 12.8 Alternate Method
  • 12.9 Summary

Inspec keywords: radio direction-finding; antennas; interferometry

Other keywords: phase difference measurment; nonstabilized antenna baseline; static interferometer analysis; interferometry; antennas; direction finding; coordinate conversion process; three-dimensional plane

Subjects: Single antennas; Radionavigation and direction finding

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