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Data Convergence of circular Array Correlative Interferometer Direction Finding with 7-Antenna

7-안테나로 구성된 원형배열 상관형 위상비교 방향탐지의 데이터 융합

  • Lim, Joong-Soo (Division of Information & Communication Eng., Baekseok University)
  • 임중수 (백석대학교 정보통신학부)
  • Received : 2016.11.17
  • Accepted : 2017.01.20
  • Published : 2017.01.28

Abstract

In this paper, we propose a new method for a correlative phase comparison direction finding(DF) which detects the arrival direction of radio waves by data fusing the calculated phase difference and the measured phase difference between the antennas when the radio waves are incident on the circular array antenna composed of 7 antennas respectively. The correlation type phase comparison method uses a uniform circular array(UCA) and a linear array method. The phase difference data calculated formally and the phase difference data measured in the test environment are fused with a correlation function, therefore, it is superior to the currently used phase comparison direction detection method. When the signal-to-noise ratio (SNR) of the received signal is 20dB and the inter-antenna distance to the wavelength of the received signal($L/{\lambda}$) is 0.5, the accuracy of the correlative DF is $1.7^{\circ}$ while measurement phase comparison's is larger than $2.5^{\circ}$, It can be used for electromagnetic signal monitoring and military direction detection.

본 논문은 7개 안테나로 구성된 원형배열 안테나에 전파가 입사될 때 안테나 상호간의 계산 위상차와 시험 환경에서 측정한 위상차를 데이터 융합하여 전파의 도래 방향을 탐지하는 상관형(correlative) 위상비교 방향탐지에 대하여 기술하였다. 상관형 위상비교 방식은 균일원형배열(UCA: uniform circular array)과 선형 배열 방식이 많이 사용되며, 수식적으로 계산한 위상차 데이터와 시험 환경에서 측정한 위상차 데이터를 상관함수로 데이터 융합하여 전파 입사 방위각을 계산하므로 현재 많이 사용되고 있는 측정위상차비교 방향탐지 방식보다 성능이 우수하다. 수신신호의 신호잡음비(SNR)가 20dB이고 수신신호의 파장에 대한 안테나 상호간 거리($L/{\lambda}$)가 0.5인 경우 상관형 방탐은 방향탐지 정확도가 $1.7^{\circ}$ 로 나타나서 측정형 위상비교인 경우 $2.5^{\circ}$ 이상인 것과 비교하여 우수한 것이 확인되었으며 전자파신호 감시용, 군사용 방향탐지용에 사용될 수 있을 것으로 판단된다.

Keywords

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