An Investigation Study on the Ambiguity for the Circular Array Direction Finding System

Authors

  • Young-Ho Kim
  • Gyoo-Soo Chae
  • Joong-Soo Lim

Abstract

In the circular array interferometer direction finding, azimuth ambiguity appears when the baseline is 0.5? or more, and an antenna is added to eliminate the ambiguity. This paper describes a circular array antenna structure of the interferometer direction finding system for an unmanned aerial vehicle. In this study, we analyze the phase difference pattern of the antenna set of the circular array interferometer and propose the PDPC(phase difference pattern comparison) method to remove azimuth ambiguity by comparing the phase difference pattern. To eliminate the ambiguity of the direction finding, the boundary value of the phase difference in which ambiguity appears should be calculated. This method is consistent with the simulation results when the baseline is less than 1.3?, and this makes the device small and inexpensive. Future work will be to enhance the reception accuracy of the telecommunication system by improving the direction finding accuracy.

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Published

2020-03-26

Issue

Section

Articles