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

The Korean Institute of Electromagnetic Engineering and Science (한국전자파학회)
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The Relation of Time Resolution and Radial Velocity Accuracy of a CW Doppler Radar

CW 도플러 레이더의 시각 분해능과 시선 속도 정확도의 관계

  • Ryu, Chung-Ho (Defense Systems Test Center, Agency for Defense Development) ;
  • Jang, Yong-Sik (Defense Systems Test Center, Agency for Defense Development) ;
  • Choi, Ik-Hwan (Defense Systems Test Center, Agency for Defense Development)
  • 류충호 (국방과학연구소 종합시험단) ;
  • 장용식 (국방과학연구소 종합시험단) ;
  • 최익환 (국방과학연구소 종합시험단)
  • Received : 2012.03.06
  • Accepted : 2012.05.31
  • Published : 2012.07.31
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Abstract

A CW Doppler radar can measure radial velocity of an object. It detects a Doppler frequency shift that is proportioned to radial velocity of a moving object. To detect a Doppler frequency shift, FFT(Fast Fourier Transform) is conducted. In this process, the time domain received signal is transformed to a frequency domain. A number of FFT affects not only the time resolution but also signal to noise ratio of received signal. So finally it is related with a radial velocity accuracy. Therefore in this paper, it is described the relation of time resolution and the radial velocity accuracy.

CW 도플러 레이더는 움직이는 물체의 속도에 비례하는 도플러 주파수 편이를 검출함으로써 속도를 계측한다. 도플러 주파수 편이를 검출하기 위해서 시간영역에서 획득한 수신 신호를 주파수 영역으로 변환하기 위한 FFT(Fast Fourier Transform)를 수행한다. 이때 FFT 개수에 의해 도플러 레이더의 시각 분해능이 달라진다. 또한, FFT 개수는 수신 신호의 신호 대 잡음비에도 영향을 미치므로, 결국 시선 속도의 정확도와도 관련 있다. 따라서 본 논문에서는 FFT 개수에 따라 달라지는 시각 분해능과 시선 속도 정확도의 관계를 제시하였다.

Keywords

References

  1. Merrill I. Skolnik, Introduction to Radar Systems, McGraw-Hill, pp. 1, 105, 34, 2001.
  2. Bassem R. Mahafza, Radar Systems Analysis and Design using MATLAB, McGraw-Hill, pp. 1-4, 2005.
  3. J. D. Pinezich, Jason Heller, and Ting Hu, "Ballistic projectile tracking using CW Doppler radar", IRE Transactions on Aerospace and Electronic Systems, vol. 46, no. 3, p. 1302, Jul. 2010. https://doi.org/10.1109/TAES.2010.5545190
  4. Steve Whitfield, "Tomorrow's test range requirements, increasing demands and components", BAE Systems, p. 11, 2011.
  5. J. Martin, "Range and Doppler accuracy improvement for pulse Doppler radar", Radar '97 Conference, Publ, no. 449, p. 439, Oct. 1997.
  6. D. K. Barton, Radar System Analysis and Modeling, Artech House, pp. 424-425, 2005.
  7. 황규환, 표적운동분석 이론, 국방과학연구소 DSTC-509-030815, p. 9, 2003년.
  8. Alan V. Oppenheim, Ronald W. SChafer, and John R. Buck, Discrete-Time Signal Processing, Prentice Hall, pp. 717, 696, 1998.
  9. WEIBEL, Doppler Radar Theory Technical Note, WEIBEL UG-3031 1.0, pp. 4, 7, 2009.
  10. Merrill I. Skolnik, "Theoretical accuracy of radar measurements", IRE Transactions on Aeronautical and Navigational Electronics, vol. ANE-7, pp. 123- 126, Dec. 1960. https://doi.org/10.1109/TANE3.1960.4201757

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