Studies of the sea using HF radio scatter

Radio signals of decameter wavelength resonantly scattered from waves on the sea surface are used to measure precisely the wave. length, frequency, and direction of travel of those waves. These measurements are not only important in themselves, but are also used to deduce currents, winds, and perhaps wind stress at the sea surface. Techniques for obtaining these measurements, as well as experiments to evaluate these techniques are discussed. Finally, scatter has been used to produce the first high-resolution measurements of the directional distribution of large ocean waves, measurements of ocean surface currents at ranges of 20 km, and of surface winds at ranges of 3000 km.

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

[2]  Donald L. Johnstone.  Second order electromagnetic and hydrodynamic effects in high frequency radio wave scattering from the sea , 1975 .

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

[4]  Robert H. Stewart,et al.  HF radio measurements of surface currents , 1974 .

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

[6]  Joy,et al.  Oceanography-Synthetic aperture observations of directional height spectra for 7 s ocean waves , 1973 .

[7]  Walter Munk,et al.  Wave directional spectra from synthetic aperture observations of radio scatter , 1974 .

[8]  Calvin C. Teague.  Bistatic-Radar Techniques for Observing Long-Wavelength Directional Ocean-Wave Spectra , 1971 .

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

[10]  R. Stewart,et al.  The radar cross section of the sea at 1.95 MHz: Comparison of in‐situ and radar determinations , 1975 .

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

[12]  O. Phillips.  The dynamics of the upper ocean , 1966 .

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

[14]  G. Tyler,et al.  Bistatic-Radar Observation of Long-Period, Directional Ocean-Wave Spectra with Loran A , 1970, Science.

[15]  G. Tyler,et al.  Second-Order Scattering from the Sea: Ten-Meter Radar Observations of the Doppler Continuum , 1972, Science.

[16]  Donald E. Barrick,et al.  First-order theory and analysis of MF/HF/VHF scatter from the sea , 1972 .

[17]  Jin Wu,et al.  Wind-induced drift currents , 1975, Journal of Fluid Mechanics.

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