An Inversion Method for Extraction of Wind Speed From High-Frequency Ground-Wave Radar Oceanic Backscatter

A new approach to extracting sea surface wind speed from high-frequency radar Doppler spectra is presented. Based on certain appropriate approximations associated with the Doppler region close to the first-order (Bragg) peaks, the second-order radar cross section equation is differentiated. Once Doppler shifts due to ocean currents are removed from the data, an expression that relates the wind speed to the frequency position of the second-order peak is derived. The method is applied to simulated noisy data as well as to field data obtained from a Seasonde (a product of CODAR Oceans Sensors) in Breezy Point, NY. In the latter case, the retrieved wind speeds are then compared to ground truth data measured by an anemometer from a National Oceanic and Atmospheric Administration weather station located in the vicinity of the illuminated patch of ocean. Subject to certain constraints as detailed in the manuscript, the algorithm shows significant promise.

[1]  J. M. Headrick,et al.  Sea backscatter at HF: Interpretation and utilization of the echo , 1974 .

[2]  R. Howell,et al.  Measurement Of Ocean Wave Spectra Using Narrow-beam HF Radar , 1989, 12th Canadian Symposium on Remote Sensing Geoscience and Remote Sensing Symposium,.

[3]  Donald E. Barrick,et al.  A Review of Scattering From Surfaces With Different Roughness Scales , 1968 .

[4]  Donald E. Barrick,et al.  Theory of HF and VHF Propagation Across the Rough Sea, 1, The Effective Surface Impedance for a Slightly Rough Highly Conducting Medium at Grazing Incidence , 1971 .

[5]  D. Barrick.  Remote sensing of sea state by radar , 1972 .

[6]  Robert H. Stewart,et al.  Radio measurements of oceanic winds at long ranges: An evaluation , 1975 .

[7]  W. Pierson,et al.  Wind Generated Gravity Waves , 1955 .

[8]  B. Lipa,et al.  Least-squares methods for the extraction of surface currents from CODAR crossed-loop data: Application at ARSLOE , 1983, IEEE Journal of Oceanic Engineering.

[9]  J. Maresca,et al.  Measurement of oceanic wind speed from HF sea scatter by skywave radar , 1977 .

[10]  S. Rice.  Reflection of electromagnetic waves from slightly rough surfaces , 1951 .

[11]  W. Perrie,et al.  A numerical study of nonlinear energy fluxes due to wave-wave interactions Part 1. Methodology and basic results , 1991, Journal of Fluid Mechanics.

[12]  Klaus Hasselmann,et al.  Determination of Ocean Wave Spectra from Doppler Radio Return from the Sea Surface , 1971 .

[13]  M. N. Ediger.  A Gauss-Newton method for nonlinear regression , 1991 .

[14]  K. Gurgel,et al.  Wellen Radar (WERA): a new ground-wave HF radar for ocean remote sensing , 1999 .

[15]  Eric W. Gill,et al.  A relationship between external noise and the ocean clutter models for bistatic operation of a pulsed high-frequency radar , 2001, Canadian Conference on Electrical and Computer Engineering 2001. Conference Proceedings (Cat. No.01TH8555).

[16]  J. Maresca,et al.  Estimating wind speed from HF skywave radar sea backscatter , 1982 .

[17]  Sergios Theodoridis,et al.  Surface wind speed extraction from HF sky wave radar Doppler spectra , 1982 .

[18]  Weimin Huang,et al.  HF radar wave and wind measurement over the Eastern China Sea , 2002, IEEE Trans. Geosci. Remote. Sens..

[19]  K. Hasselmann.  On the non-linear energy transfer in a gravity-wave spectrum Part 1. General theory , 1962, Journal of Fluid Mechanics.

[20]  Yukiharu Hisaki,et al.  Ocean Wave Directional Spectra Estimation from an HF Ocean Radar with a Single Antenna Array: Methodology , 2006 .

[21]  J. Ward,et al.  Power Spectra from Ocean Movements measured remotely by Ionospheric Radio Backscatter , 1969, Nature.

[22]  K. Hasselmann,et al.  Computations and Parameterizations of the Nonlinear Energy Transfer in a Gravity-Wave Specturm. Part II: Parameterizations of the Nonlinear Energy Transfer for Application in Wave Models , 1985 .

[23]  Lucy R. Wyatt.  High order nonlinearities in HF radar backscatter from the ocean surface , 1995 .

[24]  D. Barrick,et al.  Analysis methods for narrow-beam high-frequency radar sea echo , 1982 .

[25]  J. Parent,et al.  Remote sensing of wind speed at sea surface level using HF skywave echoes from decametric waves , 1990 .

[26]  M. L. Heron,et al.  On the application of HF ocean radar to the observation of temporal and spatial changes in wind direction , 1986 .

[27]  J. M. Headrick,et al.  Tests of remote skywave measurement of ocean surface conditions , 1974 .

[28]  Barry John Dawe.  Radio wave propagation over earth : field calculations and an implementation of the roughness effect , 1988 .

[29]  D. Crombie,et al.  Doppler Spectrum of Sea Echo at 13.56 Mc./s. , 1955, Nature.

[30]  J. Kong.  Scattering of Electromagnetic Waves , 2021, Principles of Scattering and Transport of Light.

[31]  Klaus Hasselmann,et al.  A parametric wave prediction model , 1976 .

[32]  L. Wyatt,et al.  HF Radar Wind Measurement During Nurwec2 , 1988, International Geoscience and Remote Sensing Symposium, 'Remote Sensing: Moving Toward the 21st Century'..

[33]  M. Heron,et al.  Wave height and wind direction from the HF coastal ocean surface radar , 2002 .

[34]  Eric W. Gill,et al.  High‐frequency bistatic cross sections of the ocean surface , 2001 .

[35]  E. Gill,et al.  Measuring surface wind direction by monostatic HF ground-wave radar at the eastern China Sea , 2004, IEEE Journal of Oceanic Engineering.

[36]  W. Pierson,et al.  A proposed spectral form for fully developed wind seas based on the similarity theory of S , 1964 .

[37]  D. Trizna,et al.  Mapping of North Atlantic winds by HF radar sea backscatter interpretation , 1973 .

[38]  Huang Wei-min,et al.  HF radar wind measurement over the Eastern China Sea , 2001, MTS/IEEE Oceans 2001. An Ocean Odyssey. Conference Proceedings (IEEE Cat. No.01CH37295).

[39]  W. Pierson,et al.  The interpretation of wave spectrums in terms of the wind profile instead of the wind measured at a constant height , 1964 .

[40]  J. R. Wait,et al.  Theory of HF ground wave backscatter from sea waves , 1966 .

[41]  J. Walsh,et al.  Measurement of ocean wave spectra using narrow-beam HE radar , 1993 .