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Radio Frequency Interference Suppression Algorithm Based on SOCP in OTHR

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Abstract

Sky wave over-the-horizon radar is easily affected by radio frequency interference (RFI) since it shares the high-frequency band with many radio services. Among the existing methods, spatial filtering method is ineffective to suppress the mainlobe RFI, and time-frequency method usually weakens the target signal while rejecting RFI. In this paper, we notice that, before matched filtering, RFI is usually a narrowband signal but the target echo is a broadband signal. According to this feature, an efficient RFI suppression algorithm is proposed by designing a new matched waveform based on a constrained optimization problem. Further, we show that this problem can be reformulated in a convex form as the second-order cone program and solved efficiently using the well-established interior point method. Compared with the existing methods, the proposed algorithm can suppress the RFI from any direction of arrival and get a higher output signal-to-interference-plus-noise ratio. Experimental results demonstrate that the proposed algorithm outperforms the existing methods.

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Acknowledgments

This work is supported by the Fundamental Research Funds for the Central Universities of Ministry of Education of China (Grant No. ZYGX2014J021) and the National Natural Science Foundation of China (Grant Nos. 61371184, 61201280).

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Authors and Affiliations

  1. School of Electronic Engineering, University of Electronic Science and Technology of China, Chengdu, 611731, China

    Jinfeng Hu, Hanwen Chen, Huiyong Li & Julan Xie

  2. Quanzhou Institute of Equipment Manufacturing, Haixi Institutes, Chinese Academy of Sciences, Jinjiang, China

    Zhirong Lin

Authors
  1. Jinfeng Hu
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  2. Hanwen Chen
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  3. Zhirong Lin
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  4. Huiyong Li
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Correspondence to Jinfeng Hu.

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Hu, J., Chen, H., Lin, Z. et al. Radio Frequency Interference Suppression Algorithm Based on SOCP in OTHR. Circuits Syst Signal Process 36, 2459–2472 (2017). https://doi.org/10.1007/s00034-016-0422-4

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  • DOI: https://doi.org/10.1007/s00034-016-0422-4

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