The measurement of sea surface profile with X-band coherent marine radar

Wang, Yunhua; Li, Huimin; Zhang, Yanmin; Guo, Lixin

doi:10.1007/s13131-015-0731-7

Cited by 18 publications

(12 citation statements)

References 19 publications

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“…The study on electromagnetic scattering from rough surface has been the subject of intensive investigation over the past decades for its application in land and ocean remote sensing [1][2][3][4][5][6][7][8][9][10][11][12][13][14]. Normalized radar cross section (NRCS), frequency spectrum and polarimetric properties are generally used to describe scattering fields.…”

Section: Introductionmentioning

confidence: 99%

“…Among these parameters, NRCS and frequency spectrum reflect the intensity of the scattering field and the line-of-sight velocity of the scatterers, respectively. In the area of ocean remote sensing, NRCS and Doppler behaviors of sea echoes have been widely used to retrieve wind field [5], sea wave spectrum [6][7][8][9][10] and sea surface current [11][12][13][14]. It is well known that the actual sea surface can be represented by a sum of sine waves based on the linear theory [15].…”

Section: Introductionmentioning

confidence: 99%

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The Properties of the Electromagnetic Scattering From a Sinusoidal Water Wave

Wang¹,

Yu²,

Zhang³

et al. 2018

PIER C

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Abstract-Within the framework of the higher-order Kirchhoff approximation, the properties of the electromagnetic scattering from sinusoidal water waves are presented, and the theoretical formulas up to third-order for describing the scattering field and its spectrum are derived. It shows that not only the spectral peaks which correspond to phase velocity of the water wave but also other discrete harmonic peaks can be found from the theoretical spectrum model. And the Doppler shifts of the spectral peaks are all integral multiple of the sinusoidal wave's frequency. For the backscattering field from a sinusoidal wave, the higher-order resonant peaks would also be found at different scattering angles, and the values of these peaks decrease with the scattering angle. On the other hand, the comparisons with the MoM demonstrate that the contributions of the slope-dependent terms can be generally neglected if the amplitude of the sinusoidal wave is small. However, if the waves slope is larger, the impact of the second order scattering becomes obvious and cannot be omitted.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The Properties of the Electromagnetic Scattering From a Sinusoidal Water Wave

Wang¹,

Yu²,

Zhang³

et al. 2018

PIER C

Self Cite

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“…Each peak gives two values: T d and A d . Consequently, the wave period and height are obtained by substituting these two values into Equations (9) and (10). Different wave heights can be measured if different radar looking directions are used.…”

Section: Numerical Simulationsmentioning

confidence: 99%

“…HF radar [3][4][5][6] is employed to measure the sea wave spectrum, wave height, wind field, and surface current velocity. Both non-coherent and coherent microwave radars have been used to measure wave spectra and estimate wave characteristics at sea surface [7][8][9][10]. ISR CORrad Digital Imaging Radar [11] and Sigma S6 WaMoS II Wave Radar [12] are two commercially available X-band marine radars for which the wave measurements are based on the analysis of various radar images.…”

Section: Introductionmentioning

confidence: 99%

Ocean Wave Measurement Using Short-Range K-Band Narrow Beam Continuous Wave Radar

et al. 2018

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Abstract:We describe a technique to measure ocean wave period, height and direction. The technique is based on the characteristics of transmission and backscattering of short-range K-band narrow beam continuous wave radar at the sea surface. The short-range K-band radar transmits and receives continuous signals close to the sea surface at a low-grazing angle. By sensing the motions of a dominant facet at the sea surface that strongly scatters signals back and is located directly in front of the radar, the wave orbital velocity can be measured from the Doppler shift of the received radar signal. The period, height and direction of ocean wave are determined from the relationships among wave orbital velocity, ocean wave characteristics and the Doppler shift. Numerical simulations were performed to validate that the dominant facet exists and ocean waves are measured by sensing its motion. Validation experiments were conducted in a wave tank to verify the feasibility of the proposed ocean wave measurement method. The results of simulations and experiments demonstrate the effectiveness of the short-range K-band narrow beam continuous wave radar for the measurement of ocean waves.

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“…Point spread function (PSF) is an important indicator to characterize the degradation in imaging process, and there are several methods to measure it. Rectangular grating measurement [4] simplifies the preparation of the target, but the fabrication of fine slits greatly increases the test cost. Slits measurement [5,6] is a simple sample preparation and high accuracy method, but requires a good parallelization of the slits and the pixel array of FPD.…”

Section: Introductionmentioning

confidence: 99%

Point spread function modeling and image restoration for cone-beam CT

Zhang¹,

Huang²,

Yan³

et al. 2015

Chinese Phys. C

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X-ray cone-beam computed tomography (CT) has the notable features such as high efficiency and precision, and is widely used in the fields of medical imaging and industrial non-destructive testing, but the inherent imaging degradation reduces the quality of CT images. Aimed at the problems of projection images degradation and restoration in cone-beam CT, a point spread function (PSF) modeling method is proposed firstly. The general PSF model of cone-beam CT is established, and based on it, the PSF under arbitrary scanning conditions can be calculated directly for projection images restoration without the additional measurement, which greatly improved the application convenience of cone-beam CT. Secondly, a projection images restoration algorithm based on pre-filtering and pre-segmentation is proposed, which can make the edge contours in projection images and slice images clearer after restoration, and control the noise in the equivalent level to the original images. Finally, the experiments verified the feasibility and effectiveness of the proposed methods.

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The measurement of sea surface profile with X-band coherent marine radar

Cited by 18 publications

References 19 publications

The Properties of the Electromagnetic Scattering From a Sinusoidal Water Wave

The Properties of the Electromagnetic Scattering From a Sinusoidal Water Wave

Ocean Wave Measurement Using Short-Range K-Band Narrow Beam Continuous Wave Radar

Point spread function modeling and image restoration for cone-beam CT

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