Radio Frequency Interference Cancelation in High-Frequency Surface Wave Radar Using Orthogonal Projection Filtering

2018 ◽  
Vol 15 (9) ◽  
pp. 1322-1326 ◽  
Author(s):  
Zezong Chen ◽  
Fei Xie ◽  
Chen Zhao ◽  
Chao He
Keyword(s):  
Surface Wave ◽  
Radio Frequency ◽  
Orthogonal Projection ◽  
High Frequency ◽  
Radio Frequency Interference ◽  
Wave Radar ◽  
Interference Cancelation ◽  
Projection Filtering

scholarly journals Fractional Fourier Transform-Based Radio Frequency Interference Suppression for High-Frequency Surface Wave Radar

2019 ◽  
Vol 12 (1) ◽  
pp. 75
Author(s):  
Qing Zhou ◽  
Hong Zheng ◽  
Xiongbin Wu ◽  
Xianchang Yue ◽  
Zhangyou Chen ◽  
...  
Keyword(s):  
Fourier Transform ◽  
Surface Wave ◽  
Radio Frequency ◽  
Orthogonal Projection ◽  
Carrier Frequency ◽  
High Frequency ◽  
Fractional Fourier Transform ◽  
Fourier Domain ◽  
Radio Frequency Interference ◽  
Wave Radar

High-frequency surface wave radar (HF SWR) plays an important role in marine stereoscopic monitoring system. Nevertheless, the congestion of external radio frequency interference (RFI) in HF band degrades its performance seriously. In this article, two novel fractional Fourier transform (FRFT)-based RFI suppression approaches are proposed. One is based on the orthogonal projection of sequences from fractional Fourier domain, and the other is based on singular value decomposition (SVD) of Hankel matrix of sequences from fractional inverse-Fourier domain. Simulation and experimental data collected by HF SWR from Wuhan University were used to test the effectiveness as well as the application condition of the proposed RFI suppression algorithms. The FRFT-based orthogonal projection algorithm is practicable for suppressing stationary RFI with unvaried carrier frequency, while the FRFT-based SVD algorithm is applicable equally for mitigating nonstationary RFI with time-varying carrier frequency or occasional duration time. The processing results may provide useful guidelines for interference suppression of HF SWR, and inspiring the further application of the FRFT-based methods for signal processing.

scholarly journals An Orthogonal Projection Algorithm to Suppress Interference in High-Frequency Surface Wave Radar

2018 ◽  
Vol 10 (3) ◽  
pp. 403 ◽  
Author(s):  
Zezong Chen ◽  
Fei Xie ◽  
Chen Zhao ◽  
Chao He
Keyword(s):  
Surface Wave ◽  
Orthogonal Projection ◽  
High Frequency ◽  
Projection Algorithm ◽  
Wave Radar
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