한국전자파학회논문지 (The Journal of Korean Institute of Electromagnetic Engineering and Science)

  • 제20권11호
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  • Pages.1201-1208
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  • 2009
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  • 1226-3133(pISSN)
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  • 2288-226X(eISSN)
한국전자파학회 (The Korean Institute of Electromagnetic Engineering and Science)
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공간 스펙트럼 특성을 이용한 코히런트 신호의 도래각 분해능 향상

Improvement of DOA Resolution Capability for Coherent Sources Using a Characteristic of Spatial Spectrums

  • Park, Gwang-Moon (Department of Radio Science and Engineering, Chungnam National University) ;
  • Lee, Hyeung-Gu (Department of Radio Science and Engineering, Chungnam National University) ;
  • Hong, Sung-Yong (Department of Radio Science and Engineering, Chungnam National University)
  • 발행 : 2009.11.30
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초록

도래각 추정 알고리즘의 분해능은 배열 안테나 개구면의 크기에 비례한다. 따라서 인접한 코히런트 신호를 개구면이 작은 배열 안테나를 이용하여 분해하는 것은 한계가 있다. 이러한 한계를 극복하기 위해 본 논문에서는 가상 확장 배열 안테나에 대한 공간 스펙트럼들의 특성을 이용하여 분해능을 향상시키는 방안을 제시하였다. SNR이 -10 dB에서 0 dB를 갖는 코히런트 신호가 원형 배열 안테나에 입사할 경우를 시뮬레이션한 결과, 표준 DML 알고리즘은 입사 신호를 전혀 분해할 수 없었으나, 제안한 DML 알고리즘은 100 % 분해 가능함을 확인하였다.

The Direction-Of-Arrival(DOA) resolution of signals depends on the aperture size of the array. Therefore it is not easy to resolve closely spaced coherent signals impinge on an array with a small radius. In order to overcome the problem, a new method is proposed to use the characteristic of spatial spectrums for arrays which have different aperture sizes after virtually expanding the spacing of original antenna array. In case of coherent signals impinge on an uniform circular array, the perfect DOA resolution capability of 100 % is achieved at the SNR range of -10 dB to 0 dB by the Deterministic Maximum Likelihood(DML) algorithm including the proposed method. On the other hand, the standard DML algorithm can not resolve signals at all at the same SNR.

키워드

참고문헌

  1. J. A. Cadzow, Y. S. Kim, and D. C. Shiue, "General direction of arrival estimation: a signal subspace approach", IEEE Trans. Aerosp. Electron. Syst., vol. AES-25, pp. 31-47, Jan. 1989 https://doi.org/10.1109/7.18659
  2. Y. S. Kim, "Improved resolution capability via virtual expansion of array", Electron. Lett., vol. 35, no. 19, pp. 1596-1597, Sep. 1999 https://doi.org/10.1049/el:19991108
  3. G. M. Park, S. Y. Hong, "Resolution enhancement of coherence sources impinge on a uniform circular array with array expansion", J. of Electromagn. Waves and Appl., vol. 21, no. 15, pp. 2205-2214, 2007 https://doi.org/10.1163/156939307783134371
  4. H. Wang, M. Kaveh, "Coherent signal-subspace processing for the detection and estimation of angles of arrival of multiple wideband sources", IEEE Trans. Acoustics, Speech and Signal Processing, vol. ASSP-33, no. 4, pp. 823-831, Aug. 1985

피인용 문헌

  1. Improvement of DOA Resolution Capability for Coherent Sources Using a Characteristic of Spatial Spectrums vol.20, pp.11, 2009, https://doi.org/10.5515/KJKIEES.2009.20.11.1201