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Article Navigation >  Journal of University of Electronic Science and Technology of China  > 2009  >  38(1): 17-20

LIU Yan-hui, NIE Zai-ping, ZHAO Zhi-qin. Cascaded Approach for Correcting Ionospheric Frequency Modulation in HF Sky-Wave Radars[J]. Journal of University of Electronic Science and Technology of China, 2009, 38(1): 17-20.
Citation: LIU Yan-hui, NIE Zai-ping, ZHAO Zhi-qin. Cascaded Approach for Correcting Ionospheric Frequency Modulation in HF Sky-Wave Radars[J]. Journal of University of Electronic Science and Technology of China, 2009, 38(1): 17-20.
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Cascaded Approach for Correcting Ionospheric Frequency Modulation in HF Sky-Wave Radars

  • 1.

    School of Electronic Engineering,University of Electronic Science and Technology of China Chengdu 610054

Funds:

Foundation item: Supported by the 111 project(B07046); 863 program (2007AA12Z159)

  • Received Date: 2007-03-15
  • Rev Recd Date: 2008-01-20
  • Publish Date: 2009-02-15
  • Ionospheric frequency modulation causes spreading of the surface clutter in Doppler domain which greatly limits the detection performance of HF sky-wave radars. This paper proposes a cascaded approach to correct the ionospheric frequency modulation. This approach consists of two correction steps. At the first step, time-frequency distribution (spectrogram or pseudo Wigner-Ville distribution) of the time-varying signal is adopted and a peak-tracking scheme is designed to obtain a coarse ionosperic modulation estimation from the time-frequency distribution. At the second correction step, a parametric method based on piecewise polynomial phase model is exploited to eliminate the residual contamination. Simulation results show the effectiveness of this cascaded approach even for very serious cases where broadened Bragg lines are overlapped.
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  • 1. 

    沈阳化工大学材料科学与工程学院 沈阳 110142

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Cascaded Approach for Correcting Ionospheric Frequency Modulation in HF Sky-Wave Radars

  • 1. School of Electronic Engineering,University of Electronic Science and Technology of China Chengdu 610054
Funds:

Foundation item: Supported by the 111 project(B07046); 863 program (2007AA12Z159)

  • Received Date: 2007-03-15
  • Rev Recd Date: 2008-01-20
  • Publish Date: 2009-02-15

Abstract: Ionospheric frequency modulation causes spreading of the surface clutter in Doppler domain which greatly limits the detection performance of HF sky-wave radars. This paper proposes a cascaded approach to correct the ionospheric frequency modulation. This approach consists of two correction steps. At the first step, time-frequency distribution (spectrogram or pseudo Wigner-Ville distribution) of the time-varying signal is adopted and a peak-tracking scheme is designed to obtain a coarse ionosperic modulation estimation from the time-frequency distribution. At the second correction step, a parametric method based on piecewise polynomial phase model is exploited to eliminate the residual contamination. Simulation results show the effectiveness of this cascaded approach even for very serious cases where broadened Bragg lines are overlapped.

LIU Yan-hui, NIE Zai-ping, ZHAO Zhi-qin. Cascaded Approach for Correcting Ionospheric Frequency Modulation in HF Sky-Wave Radars[J]. Journal of University of Electronic Science and Technology of China, 2009, 38(1): 17-20.
Citation: LIU Yan-hui, NIE Zai-ping, ZHAO Zhi-qin. Cascaded Approach for Correcting Ionospheric Frequency Modulation in HF Sky-Wave Radars[J]. Journal of University of Electronic Science and Technology of China, 2009, 38(1): 17-20.
shu

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