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A Study on Estimation of Doppler Frequency in a Current Velocity Measurement Radar

유속 측정 레이다에서의 도플러 주파수 추정에 관한 연구

  • Lee, Jonggil (Department of Information and Telecommunication Engineering, Incheon National University)
  • Received : 2013.03.28
  • Accepted : 2013.05.17
  • Published : 2013.07.31

Abstract

A current velocity measurement radar estimates Doppler frequencies to extract the corresponding surface velocity information. Therefore, it is required to maintain the high degree of reliability and accuracy of Doppler frequency estimates. However, Doppler spectra of water surface return echoes can have very widely varying shapes according to measurement environments and weather conditions. Therefore, serious problems may arise in maintaining the reliability and accuracy of conventional velocity estimating algorithm in a radar sensor. Therefore, in this paper, a newly suggested algorithm is proposed for improvement using estimation of peak Doppler frequencies. The proposed method shows that the more accurate velocity measurement can be possible comparing with the conventional one.

수자원 관리를 위하여 활용되고 있는 레이다 센서는 도플러 주파수를 추정함으로서 표면 유속을 측정한다. 따라서 도플러 주파수 추정치에서의 높은 신뢰성 및 정확도가 요구된다. 그러나 유속 관련 도플러 스펙트럼은 측정 환경 및 기상 상태에 따라 매우 다양한 형태를 나타낼 수 있다. 따라서 현재 레이다 센서에서 사용되는 기존의 유속정보 추출 알고리즘의 정확도 및 신뢰성에 심각한 문제가 발생할 수 있다. 따라서 본 논문에서는 기존의 방법을 개선할 수 있는 도플러 스펙트럼 첨두치 주파수 추정에 의한 유속 정보 추출 방법을 제안하였다. 제안된 방법은 기존 방법에 비하여 더 정확한 유속의 측정이 가능함을 보여준다.

Keywords

References

  1. G. L. Charvat and L. C. Kempel, "Synthetic aperture radar imaging using a unique approach to frequency-modulated continuous-wave radar design," IEEE Antennas and Propagation Magazine, vol. 48, no. 1, pp. 171-177, 2006.
  2. A. Tessmann et al., "Compact single-chip W-band FMCW radar modules for commercial applications," IEEE Trans. Microwave Theory and Techniques, vol. 50, no. 12, pp. 2995-3001, 2002. https://doi.org/10.1109/TMTT.2002.805162
  3. Y. Doisy, "Theoretical accuracy of Doppler navigation sonars and acoustic Doppler current profilers," IEEE Journal of Oceanic Engineering, vol. 29, no. 2, pp. 430-441, 2004. https://doi.org/10.1109/JOE.2004.828201
  4. N. B. Melcher et al., "River discharge measurements by using helicopter-mounted radars," Geophys. Res. Lett., vol. 29, no. 22, pp. 2084-2084, 2002. https://doi.org/10.1029/2002GL015525
  5. W. J. Plant and W. C. Keller, "Evidence of bragg scattering in microwave Doppler spectra of sea return," J. Geophys. Res., vol. 95, no. C9-16, pp. 16299-16310, 1990. https://doi.org/10.1029/JC095iC09p16299
  6. R. F. Contreras and W. J. Plant, "Ku-band backscatter from the Cowlitz River: Bragg scattering with and without rain," IEEE Trans. Geosci. Remote Sens., vol. 42, no. 7, pp. 1444-1449, 2004. https://doi.org/10.1109/TGRS.2004.828921
  7. F. G. Bass et al., "Very high frequency radiowave scattering by a disturbed sea surface, part II: Scattering from an actual sea surface," IEEE Trans. Antennas and Propagation, vol. 16, no. 5, pp. 560-568, 1968. https://doi.org/10.1109/TAP.1968.1139244
  8. D. S. Zrnic, "Estimation of spectral moments for weather echoes," IEEE Trans. Geosci. Electron., vol. 17, pp. 113-128, 1979. https://doi.org/10.1109/TGE.1979.294638
  9. D. H. Johnson, "The application of spectral estimation methods to bearing estimation problems," Proc. IEEE, vol. 70, pp. 1018-1028, 1982. https://doi.org/10.1109/PROC.1982.12430
  10. D. H. Johnson and S. R. DeGraaf, "Improving the resolution of bearing in passive sonar arrays by eigenvalue analysis," IEEE Trans. Acoust. Speech Signal Process., vol. 30, pp. 638-647, 1982. https://doi.org/10.1109/TASSP.1982.1163915
  11. M. Kaveh and A. J. Barabell, "The statistical performance of the MUSIC and the minimum-norm algorithms for resolving plane waves in noise," IEEE Trans. Acoust. Speech Signal Process., vol. 34, pp. 331-341, 1986. https://doi.org/10.1109/TASSP.1986.1164815

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