A New Algorithm for Surface Currents Inversion With High-Frequency Over-the-Horizon Radar

Li, Miao; Wu, Xiongbin; Zhang, Lan; Yue, Xianchang; Li, Chuan; Liu, Jianfei

doi:10.1109/lgrs.2017.2709816

Cited by 13 publications

(11 citation statements)

References 15 publications

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“…Some parameters of the HF SWR system were as follows: The center frequency was 13.15 MHz, the bandwidth was 30 kHz, the sweep period was 0.5 s, CIT was 300 s (including 600 sweep periods), a sweep period was composed of 996 snapshots, and range resolution was 5 km. For more details of the experimental HF SWR system, one is referred to literatures [23,24]. Figure 11a shows the power distribution of raw data transformed into FRFD, the optimal matched-order p = 1.958.…”

Section: Resultsmentioning

confidence: 99%

“…The original RDS in Figure 11b cannot be used for current inversion. As RFI generated spurious signals in RDS, they may be misinterpreted by the current and wave algorithm [24,29] as the first-order Bragg peak. As a result, patches of fake current within the expected range may cover the real current.…”

Section: Resultsmentioning

confidence: 99%

“…where ∆ f = f i − f 0 is the initial frequency, t 1 = (−b − ∆ f )/k and t 2 = (b − ∆ f )/k are the start and end time instants [25]. Wuhan University [23,24] were processed to verify the applicability of the proposed algorithms. The discussion is in Section 5, and the conclusion is in section 6.…”

Section: Characteristics Of External Rfimentioning

confidence: 99%

“…Section 3 presents some experimental results combined with simulated RFI. In Section 4, experimental data collected from the HF SWR system developed by Wuhan University [23,24] were processed to verify the applicability of the proposed algorithms. The discussion is in Section 5, and the conclusion is in Section 6.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

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

Zhou

Zheng

et al. 2019

Remote Sensing

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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.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Characteristics Of External Rfimentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

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

Zhou

Zheng

et al. 2019

Remote Sensing

Self Cite

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“…HFHSSW radar has an advancement in large-scale environment surveillance and early warning. In the recent decade, a few studies about HFHSSW radar have been conducted on system simulation (e.g., Chen, Huang, & Gill, 2016;Chen et al, 2016aChen et al, , 2016bJiang et al, 2011;Jiao et al, 2007;Li et al, 2016;Walsh et al, 2014Walsh et al, , 2015, system designation and experiment (e.g., Cui et al, 2016;Zhao et al, 2013), application in target over-the-horizon detection (see, e.g., Riddolls, 2007Riddolls, , 2008Zhang et al, 2014), and ocean surface dynamic parameters inversion (see, e.g., Ji et al, 2017;Li et al, 2017Li et al, , 2018.…”

Section: Introductionmentioning

confidence: 99%

Correction of Ionospheric Distortion on HF Hybrid Sky‐Surface Wave Radar Calibrated by Direct Wave

et al. 2019

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The performance of the high-frequency hybrid sky-surface wave radar is often degraded due to the distortion of radar echoes induced by time-varying ionosphere. Here a modified S-transform method based on the direct wave for ionosphere decontamination of high-frequency hybrid sky-surface wave radar is presented. First, we extract the time-varying-ionosphere-distorted phase of the echoes from the direct wave of high-frequency hybrid sky-surface wave radar by using the modified S-transform. Then this phase function is used to decontaminate the ionosphere distortion of radar echo at each range bins. Simulations and experimental data are conducted to validate the performance of the proposed method on decontaminating the distortion. The experimental data are acquired by Wuhan Universitys ocean state measuring and analyzing radar. A mass of radar data is processed and analyzed, demonstrating that the decontamination effect is statistically significant. The method is not only effective to remove the Doppler shift of direct wave and Bragg peaks caused by ionosphere but also able to narrow the broadened direct wave and Bragg peaks. Meanwhile, the SNR is improved in most range bins; the background noise is reduced detectably, sometimes significantly; and some isolated radar echoes near direct wave or Bragg peaks are recovered or enhanced. These results indicate that the proposed decontamination algorithm works well.

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Construction of sea surface current vectors using a single HF radar: A theoretical study

Shi

Chen

et al. 2022

iScience

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A New Algorithm for Surface Currents Inversion With High-Frequency Over-the-Horizon Radar

Cited by 13 publications

References 15 publications

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

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

Correction of Ionospheric Distortion on HF Hybrid Sky‐Surface Wave Radar Calibrated by Direct Wave

Construction of sea surface current vectors using a single HF radar: A theoretical study

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