2016
DOI: 10.1175/jtech-d-15-0130.1 View full text |Buy / Rent full text
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Abstract: The possibility of reconstructing sea surface wave fields from a noncoherent X-band marine radar return has much potential for maritime operations and ocean engineering. The existing reconstruction method extracts the signal associated with gravity waves that satisfy the dispersion relationship. The process involves parameters related to how the radar signal is modulated by waves of different lengths, propagation directions, amplitudes, and phases. In the absence of independent wave measurements, these reconst… Show more

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“…Real-time, phase-resolved, ocean waves can be reconstructed over some area surrounding a vessel or structure of interest by fitting a wave model to a large data set of measured surface elevations, acquired for instance with: (i) a X-band radar (Nieto Borge et al 2004;Dankert & Rosenthal 2004;Hilmer & Thornhill 2014;Qi et al 2016;Naaijen et al 2018); or (ii) a LIDAR camera (Belmont et al 2007;Nouguier et al 2014). LIDAR cameras operate in the visible light (e.g., green laser of µm wavelength) and make direct (georeferenced) measurements of the ocean surface; hence, they have the potential to finely sample the ocean surface and thus resolve higher frequency waves.…”
Section: Introductionmentioning
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“…Real-time, phase-resolved, ocean waves can be reconstructed over some area surrounding a vessel or structure of interest by fitting a wave model to a large data set of measured surface elevations, acquired for instance with: (i) a X-band radar (Nieto Borge et al 2004;Dankert & Rosenthal 2004;Hilmer & Thornhill 2014;Qi et al 2016;Naaijen et al 2018); or (ii) a LIDAR camera (Belmont et al 2007;Nouguier et al 2014). LIDAR cameras operate in the visible light (e.g., green laser of µm wavelength) and make direct (georeferenced) measurements of the ocean surface; hence, they have the potential to finely sample the ocean surface and thus resolve higher frequency waves.…”
Section: Introductionmentioning
“…Real-time phase-resolved, ocean waves can be reconstructed over some area surrounding a vessel or structure of interest by fitting a wave model to a large data set of measured surface elevations, acquired for instance with: (i) an X-band radar (Dankert & Rosenthal 2004;Nieto Borge et al 2004;Hilmer & Thornhill 2014;Qi, Xiao & Yue 2016;Naaijen et al 2018); or (ii) a light detection and ranging (LIDAR) camera (Belmont et al 2007;Nouguier et al 2014). LIDAR cameras operate in the visible light (e.g.…”
Section: Introductionmentioning
“…The conventional spectral analysis method based on a three-dimensional Fourier transform is an effective approach for extracting wave parameters from radar images [6][7][8][9]. The basic idea is to use a To address deficiencies of the conventional method, and in view of the advantages of CNN in image processing, we developed a CNN-based technique for wave parameter inversion from radar sea clutter images.…”
Section: Introductionmentioning
“…Meanwhile, a calibration process is also necessary to estimate the SNR. However, the empirical formulas introduce unknown empirical parameters which must be calibrated for a given radar, wave environment and the range and azimuthal angle of the sampled subdomain relative to the radar and wave field [7]. The calibration processes are expensive and generally available for only a (small) subset of the conditions that may be obtained under deployment.…”
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“…However, in situ measurements, typically made from a moving vessel or vehicle, are more challenging since wave reconstruction must rely on data acquired at constantly updated locations surrounding the path of the vehicle, which leads to practical limitations. A successful solution to this problem was proposed based on X-band radar measurements made from an onboard sensor, combined with a 3D-FT to reconstruct a large patch of free surface elevation surrounding the sensor [10][11][12][13]. This initial estimate was then used in a direct numerical simulation of future sea states.…”
Section: Introductionmentioning