Wave Height Extraction From the First-Order Bragg Peaks in High-Frequency Radars

Zhou, Hao; Wen, Biyang

doi:10.1109/lgrs.2015.2472976

Cited by 26 publications

(21 citation statements)

References 19 publications

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“…ω p , equals to the radar Bragg frequency. However, in reality this spectral peak is rarely seen (see [9,11]). Hence, the influence of γ will not be discussed in this paper.…”

Section: Relationship Between First-order Echo Power and Wave Heightmentioning

confidence: 99%

“…Hence, the following exponential model is employed, where a, b and c are three model coefficients introduced to account for possible uncertainties of the constant variables in Equations (9) and (11).…”

Section: Model Of Dual-frequency Power Ratio With Wave Height and Dismentioning

confidence: 99%

“…Recently, the relationship between the first-order echo power and wave height or wind speed was investigated [9][10][11]. Such a relationship was developed to calculate wave height and wind speed.…”

Section: Introductionmentioning

confidence: 99%

“…Despite the wind field information over the radar coverage was obtained, the accuracy is relative poor due to error of the spreading model selected and inadequate in situ wind data used for training. In [11], wave height at single location was estimated from the first-order radar Doppler spectra but no calibration of distance and direction dependency was considered. In [10], the same directional spreading model used in [9] were employed.…”

Section: Introductionmentioning

confidence: 99%

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Wave Height Estimation from First-Order Backscatter of a Dual-Frequency High Frequency Radar

et al. 2017

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Second-order scattering based wave height measurement with high-frequency (HF) radar has always been subjected to problems such as distance limitation and external interference especially under low or moderate sea state. The performance is further exacerbated for a compact system with small antennas. First-order Bragg scattering has been investigated to relate wave height to the stronger Bragg backscatter, but calibrating the echo power along distance and direction is challenging. In this paper, a new method is presented to deal with the calibration and improve the Bragg scattering based wave height estimation from dual-frequency radar data. The relative difference of propagation attenuation and directional spreading between two operating frequencies has been found to be identifiable along range and almost independent of direction, and it is employed to effectively reduce the fitting requirements of in situ wave buoys. A 20-day experiment was performed over the Taiwan Strait of China to validate this method. Comparison of wave height measured by radar and buoys at distance of 15 km and 70 km shows that the root-mean-square errors are 0.34 m and 0.56 m, respectively, with correlation coefficient of 0.82 and 0.84.

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“…ω p , equals to the radar Bragg frequency. However, in reality this spectral peak is rarely seen (see [9,11]). Hence, the influence of γ will not be discussed in this paper.…”

Section: Relationship Between First-order Echo Power and Wave Heightmentioning

confidence: 99%

Section: Model Of Dual-frequency Power Ratio With Wave Height and Dismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Wave Height Estimation from First-Order Backscatter of a Dual-Frequency High Frequency Radar

et al. 2017

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“…The current observation HFRs can be roughly divided into two types based on the method employed to determine the bearing of the radial currents: beam forming (e.g., WERA [2]) and direction finding (e.g., CODAR [3] and OSMAR-S [4,5]). Beam forming radars electronically steer a linear phased array of receiving antennas toward a patch of the ocean surface.…”

Section: Introductionmentioning

confidence: 99%

Ocean Surface Current Observation with a Dual Monopole-Cross-Loop Antenna Array

Lai¹,

Zhou²,

Zeng³

et al. 2017

International Journal of Antennas and Propagation

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The high-frequency radars (HFRs) receiving the sea echoes backscattered from the fluctuating ocean surface to remotely sense ocean surface currents are a popular and powerful tool in oceanic observation. Dominant error source in current measurement for HFR systems has been recognized to be the direction of arrival (DOA) determination of the sea echoes. To eliminate this error and therefore improve the performance of direction-finding HFR system in current measurement, we have investigated a dual monopole-cross-loop (MCL) antenna array in current observation. Simulations indicated that the dual MCL antenna array has a better performance than the conventional single MCL antenna system in current mapping, especially for the complex current profile. And comparisons of radar field data and buoy measurements suggested that the RMSE value was larger than 15 cm/s for the conventional MCL antenna. But it decreased to 12.64 cm/s for the dual MCL antenna array. Moreover, the temporal coverage rate also showed the benefit of using this antenna system in current mapping. The results demonstrated that it is advisable to adopt the dual MCL antenna array in operational applications.

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HFSurface Wave Radar

Huang

Gill

2019

Wiley Encyclopedia of Electrical and Electronics Engineering

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HF surface wave radar (HFSWR) has been recognized and accepted as an important tool for ocean remote sensing for more than four decades. In this article, a comprehensive tutorial of such an ocean sensor is presented. It begins with the concept of HFSWR. Next, the history of HFSWR is briefly reviewed. Then, the classification of HFSWR in terms of waveform, array signal processing technique, the number of operating frequencies, and configuration geometry is described in detail. Subsequently, the state‐of‐the‐art applications of this type of ocean radar for sea surface current, and wave parameter measurements, wind mapping, and hard targets detection and tracking are presented. The working principles and data processing associated with each application are also explained. The remaining challenges and future trends are also discussed.

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Wave Height Extraction From the First-Order Bragg Peaks in High-Frequency Radars

Cited by 26 publications

References 19 publications

Wave Height Estimation from First-Order Backscatter of a Dual-Frequency High Frequency Radar

Wave Height Estimation from First-Order Backscatter of a Dual-Frequency High Frequency Radar

Ocean Surface Current Observation with a Dual Monopole-Cross-Loop Antenna Array

HFSurface Wave Radar

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