한국군사과학기술학회지 (Journal of the Korea Institute of Military Science and Technology)

  • 제22권3호
  • /
  • Pages.332-340
  • /
  • 2019
  • /
  • 1598-9127(pISSN)
  • /
  • 2636-0640(eISSN)
한국군사과학기술학회 (The Korea Institute of Military Science and Technology)
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레이더 신호 탐지용 디지털수신기 개발

Development of a Digital Receiver for Detecting Radar Signals

  • 차민연 (LIG넥스원(주) 전자전연구소) ;
  • 최혁재 (LIG넥스원(주) 전자전연구소) ;
  • 김성훈 (LIG넥스원(주) 전자전연구소) ;
  • 문병진 (LIG넥스원(주) 전자전연구소) ;
  • 김재윤 (LIG넥스원(주) 전자전연구소) ;
  • 이종현 (LIG넥스원(주) 전자전연구소)
  • 투고 : 2019.01.30
  • 심사 : 2019.05.03
  • 발행 : 2019.06.05
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초록

Electronic warfare systems are needed to be advantageous in the modern war. Many radar threat signals with various frequency spectrums and complicated techniques exist. For detecting the threats, a receiver with wide and narrow-band digital processing is needed. To process a wide-band searching mode, a polyphase filter bank has become the architecture of choice to efficiently detect threats. A polyphase N-path filter aligns the re-sampled time series in each path, and a discrete Fourier transform aligns phase and separates the sub-channel baseband aliases. Multiple threats and CW are detected or rejected when the signals are received in different sub-channels. And also, to process a narrow-band precision mode, a direct down converter is needed to reduce aliasing by using a decimation filter. These digital logics are designed in a FPGA. This paper shows how to design and develop a wide and narrow-band digital receiver that is capable to detect the threats.

키워드

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Fig. 1. Block diagram of the digital receiver

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Fig. 2. Buffering for 32-point sequences in the 32-stage polyphase filter bank

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Fig. 3. Spectral characteristics of sub-channels with different bandwidths

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Fig. 4. Block diagram of the FIR filter

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Fig. 5. Block diagram of the polyphase filter bank

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Fig. 6. I/Q signals of sub-band #1~#16 with 3 inputs

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Fig. 7. Specturm of Sub-band #1~16 with 3 inputs

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Fig. 8. Block diagram of the DDC

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Fig. 9. Frequency plan of the DDC

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Fig. 10. Flow chat of operation modes

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Fig. 11. Set-up of the digital receiver with an RF board

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Fig. 12. Instantaneous bandwidth of the wide-band

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Fig. 13. Measured pulse amplitude of the wide-band

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Fig. 14. Measured frequency of the wide-band

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Fig. 15. Measured pulse width of the wide-band

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Fig. 16. Instantaneous bandwidth of the narrow-band

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Fig. 17. Measured pulse amplitude of the narrow-band

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Fig. 18. Measured frequency of the narrow-band

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Fig. 19. Measured pulse width of the narrow-band

Table 1. Summary of measurements

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참고문헌

  1. J. Tsui and J. P. Stephens, Sr., "Digital Microwave Receiver Technology," Transactions Microwave Theory Technology, Vol. 50, pp. 699-705, March. 2002. https://doi.org/10.1109/22.989955
  2. Anthony E. Spezio, "Electronic Warfare Systems," 633-664, IEEE Transactions on Microwave Theory and Techniques, Vol. 50, No. 3, March, 2002. https://doi.org/10.1109/22.989948
  3. Naval Air Systems Command and Naval Air Warfare Center, "Electronic Warfare And Radar Systems Engineering Handbook," April, 1999.
  4. W. A. Mahmoud, A. K. Sharief, and F. D. Umara, "Radar Parameter Generation to Identify the Target," J. Engineering, Vol. 17, No. 1, pp. 173-185, Feb. 2011.
  5. Xilinx, "7 Series FPGAs Overview," July, 2013.
  6. Fredric J. Harris, Chris Dick, and Michael Rice, "Digital Receivers and Transmitters Using Polyphase Filter Banks for Wireless Communications," IEEE Transactions on Microwave Theory and Techniques, Vol. 51, No. 4, pp. 1395-1412, April, 2003. https://doi.org/10.1109/TMTT.2003.809176
  7. Xilinx, "Polyphase Filter Bank Channelizer," March, 2013.
  8. John G. Proakis, Dimitris G. Manolakis, "Digital Signal Processing," Prentice Hall, Third Edition, 1996.
  9. Joe Gerhardt and Saiyu Ren, "Digital Down Converter Optimization," IEEE 56th International Midwest Symposium on Circuits and Systems, pp. 1015-1018, Augst, 2013.
  10. Teledyne Microwave Solutions, "Digitising Receiver, DR068," February, 2016.