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 (Figure 15.1). 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:

  • 15.1 Interferometer analysis
  • 15.2 Direction cosines
  • 15.3 Basic interferometer equation
  • 15.4 Three-dimensional approach
  • 15.5 Antenna position matrix
  • 15.6 Coordinate conversion due to pitch and roll
  • 15.7 Using direction cosines
  • 15.8 Alternate method
  • 15.9 Quaternions
  • 15.10 Summary
  • 15.11 Problems
  • Further reading

Inspec keywords: radio direction-finding; antennas; interferometry

Other keywords: interferometer analysis; direction finding; static interferometer; three-dimensional plane; nonstabilized antenna baseline

Subjects: Single antennas; Radionavigation and direction finding

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