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## Direction finding and interferometer analysis

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Transceiver and System Design for Digital Communications, 5th Edition — Recommend this title to your library

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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

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