Abstract
This paper reviews analytical methods in electromagnetic scattering theory (i.e., geometrical and physical optics, perturbation, iteration, and integral-equation) which are applicable to the problems of remote sensing of the ocean. In dealing with Earth's surface (in this case, the weakly non-linear ocean), it is not possible to have a complete and exact description of its spatial and temporal statistics. Only the first few moments are generally available; and in the linear approximation the statistics are assumed homogeneous, stationary and Gaussian. For this case, the high-frequency methods (geometrical and physical optics) and perturbation (Rayleigh-Rice), or a combination of them, provide tractable analytical results (i.e., the specular-point, the slightly-rough Bragg scattering and the composite-surface models). The applicability and limitations of these models are discussed. At grazing incidence and for higher frequencies, other scattering mechanisms become significant; and shadowing, diffraction and trapping must be considered.
The more exact methods (integral-equation and Green's function) have not been as successful in yielding tractable analytical solutions, although they have the potential to provide improved theoretical scattering results in the future.
Similar content being viewed by others
References
Andreasen, M. G.: 1965, ‘Scattering from Bodies of Revolution’,IEEE Trans. AP-13, 303–310.
Barrick, D. E.: 1968, ‘Rough Surface Scattering Based on the Specular Point Theory’,IEEE Trans. AP-16, 449–454.
Barrick, D. E.: 1970 ‘Comments on backscattering of Waves by Composite Rough Surfaces’,IEEE Trans. AP-18, 718–719.
Barrick, E. E.: 1971, ‘Theory of HF/VHF Propagation across the Rough Sea’,Radio Sci. 6, 517–533.
Barrick, D. E.: 1972a, ‘First-Order Theory and Analysis of MF/HF/VHF Scatter from the Sea’,IEEE Trans. AP-20, 2–10.
Barrick, D. E.: 1972b, ‘Remote Sensing of Sea State by Radar’, Chapter 12 in V. E. Derr (ed.),Remote Sensing of the Troposphere, Washington, D.C.
Barrick, D. E.: 1974, ‘Wind Dependence of Quasi-Specular Microwave Sea Scatter’,IEEE Trans. AP-22, 135–136.
Barrick, D. E. and Peake, W, H.: 1968, ‘A Review of Scattering from Surfaces with Different Roughness Scales’,Radio Sci. 3, 865–868.
Bass, F. G., Fuks, I. M., Kalmykov, A. E., Ostrovsky, I. E., and Rosenberg, A. D.: 1968, ‘Very High Frequency Radiowave Scattering by a Disturbed Sea Surface’,IEEE Trans. AP-16, 554–568.
Beckmann, P. and Spizzichino, A.: 1963,The Scattering of Electromagnetic Waves from Rough Surfaces, Macmillan Co., New York, N.Y., 503 pp.
Berger, T.: 1972, ‘Satellite Altimetry Using Ocean Backscatter’,IEEE Trans. AP-20, 295–309.
Braude, S. Ya.: 1962,Radio-Oceanographic Studies of Ocean Waves, Ukranian Academy of Sciences Press.
Brekhovskikh, L. M.: 1952, ‘The Diffraction of Waves by a Rough Surface’,Zh. Eksper. i Teor. Fiz. 23, 275–289.
Brekhovskikh, L. M.: 1960,Waves in Layered Media, Academic Press, New York, N.Y., 460 pp.
Cox, C. and Munk, W.: 1954, ‘Measurement of the Roughness of the Sea Surface from Photographs of the Sun's Glitter’,J. Opt. Soc. Am. 44, 838–850.
Crombie, D. D.: 1955, ‘Doppler Spectrum of Sea Echo at 13.56 Mc/s’,Nature 175, 681–682.
Daley, J. C.: 1973, ‘An Empirical Sea Clutter Model, Memorandum Report No. 2668’, Naval Research Laboratory, Washington, D.C., 32 pp.
Daley, J. C., Ransone, J. T., Burkett, J. A., and Duncan, J. R.: 1968, ‘Sea-Clutter Measurements on Four Frequencies’, Report No. 6806, Naval Research Laboratory, Washington, D.C., 42 pp.
Daley, J. C., Davis, W. T., and Mills, N. R.: 1970, ‘Radar Sea Return in High Sea States’, Report No. 7142, Naval Research Laboratory, Washington, D.C., 46 pp.
Daley, J. C., Ransone, J. T., and Burkett, J. A.: 1971, ‘Radar Sea Return — JOSS I’, Report No. 7268, Naval Research Laboratory, Washington, D.C., 49 pp.
Daley, J. C., Ransone, J. T., and Davis, W. T.: 1973, ‘Radar Sea Return — JOSS II’, Report No. 7534, Naval Research Laboratory, Washington, D.C., 15 pp.
DeRosa, J. K.: 1972, ‘The Characterization of Multipath and Doppler Fading in Earth Scatter Communication, Navigation, and Radar Links’, Ph.D. Thesis, Northeastern Univ., Boston, Mass.
DeSanto, J. A.: 1974, ‘Green's Function for Electromagnetic Scattering from a Random Surface’,J. Math. Phys. 15, 283–288.
Duncan, J. R., Keller, W. C., and Wright, J. W.: 1974, ‘Fetch and Wind Speed Dependence of Doppler Spectra’,Radio Sci. 9, 809–819.
Fung, A. K. and Chan, H.: 1969, ‘Backscattering of Waves by Composite Rough Surfaces’,IEEE Trans. AP-17, 590–597.
Guinard, N. W. and Daley, J. C.: 1970, ‘An Experimental Study of a Sea Clutter Model’,Proc. IEEE 58, 543–550.
Guinard, N. W., Ransone, J. T., and Daley, J. C.: 1971, ‘Variation of the NRCS of the Sea with Increasing Roughness’,J. Geophys. Res. 76, 1525–1538.
Hagfors, T.: 1964, ‘Backscattering from an Undulating Surface with Applications to Radar Returns from the Moon’,J. Geophys. Res. 69, 3779–3784.
Hasselmann, K.: 1962, ‘On the Non-linear Energy Transfer in a Gravity-Wave Spectrum’,J. Fluid Mech. 12, 481–500.
Hasselmann, K.: 1968, ‘Weak-Interaction Theory of Ocean Waves’, in M. Holt (ed.),Basic Developments in Fluid Dynamics, Academic Press, New York, pp. 117–182.
Hasselmann, K.: 1971, ‘Determination of Ocean Spectra from Doppler Radio Return from Sea Surface’,Nature 229, 16–17.
Hasselmann, K.: 1972, ‘The Energy Balance of Wind Waves and the Remote Sensing Problem’, in Proc. Sea Surface Topography from Space, Nat. Oceanic and Atmospheric Admin. tech. Rep. ERL-228, Boulder, Col.
Hasselmann, K. and Schieler, M.: 1970, ‘Doppler Spectra of Electromagnetic Backscatter from the Sea Surface at Centimeter-Decimeter and Decameter Wavelengths’, Proc. VIIIth Naval Hydrodyn. Symp. pp. 361–388.
Hasselmann, K.et XV al.: 1973, ‘Measurements of Wind-Wave Growth and Swell Decay during the Joint North Sea Wave Project (JONSWAP)’,Deutsche Hydrogr. Z., Suppl. A (8ℴ), No. 12.
Kalmykov, A. I. and Pustovoytenko, V. V.: 1976, ‘On Polarization Features of Radio Signals Scattered from the Sea Surface at Small Grazing Angles’,J. Geophys. Res. 81, 1960–1964.
Keller, W. C. and Wright, J. W.: 1975, ‘Microwave Scattering and the Straining of Wind-Generated Waves’,Radio Sci. 10, 139–147.
Keller, W. C., Larson, T. R., and Wright, J. W.: 1974, ‘Mean Speeds of Wind Waves at Short Fetch’,Radio Sci. 9, 1091–1100.
Kodis, R.: 1966, ‘A Note on the Scattering from an Irregular Surface’,IEEE Trans. AP-14, 77–82.
Larson, T. R. and Wright, J. W.: 1975, ‘Wind-Generated Gravity-Capillary Waves: Laboratory Measurements of Temporal Growth Rates using Microwave Backscatter’,J. Fluid Mech. 70, 417–436.
Long, M. W.: 1974, ‘On a Two-Scatterer Theory of Sea Echo’,IEEE Trans. AP-22, 667–672.
Long, A. E. and Trizna, D. B.: 1973, ‘Mapping of Northern Atlantic Winds by HF Radar Sea Backscatter Interpretation’,IEEE Trans. AP-21, 680–685.
Longuet-Higgins, M. S.: 1963, ‘The Effect of Non-Linearities on Statistical Distributions in the Theory of Sea Waves’,J. Fluid Mech. 17, 459–480.
Lynch, P. J. and Wagner, R. J.: 1970, ‘Rough-Surface Scattering: Shadowing, Multiple Scatter and Energy Conservation’,J. Math. Phys. 11, 3032–3042.
Maue, A. W.: 1949, ‘Zur Formulierung eines allgemeinen Beugungsproblems durch eine Integralgleichung’,Z. Physik. 126, 601–618.
Millar, R. F.: 1973, ‘The Rayleigh Hypothesis and a Related Least-Squares Solution to Scattering Problems for Periodic Surfaces and Other Scatters’,Radio Sci. 8, 785–796.
Mitzner, K. M.: 1964, ‘Effect of Small Irregularities on Electromagnetic Scattering from an Interface of Arbitrary Shape’,J. Math. Phys. 5, 1776–1786.
Mitzner, K. M.: 1967, ‘An Integral Equation Approach to Scattering from a Body of Finite Conductivity’,Radio Sci. 2, 1459–1470.
Müller, C.: 1957,Grundprobleme der Mathematischen Theorie Elektromagnetischer Schwingungen, Springer-Verlag, Berlin, 344 pp.
Peake, W. H.: 1959, ‘Theory of Radar Return from Terrain’,IRE National Convention Record 7, 27–41.
Phillips, O. M.: 1966,The Dynamics of the Upper Ocean, Cambridge Univ. Press, Cambridge, 261 pp.
Pidgeon, V. W.: 1968, ‘Doppler Dependence of Radar Sea Return’,J. Geophys. Res. 73, 1333–1341.
Rice, S. O.: 1951, ‘Reflection of Electromagnetic Waves from Slightly Rough Surfaces’,Comm. Pure Appl. Math. 4, 351–378.
Rouse, J. W., Jr.: 1972, ‘The Effect of Subsurface on Depolarization of Rough Surface Backscatter’,Radio Sci. 7, 889–895.
Ruck, G. T., Barrick, D. E., Stewart, W. D., and Kirshbaum, C. K.: 1970,Radar Cross-Section Handbook, Plenum Press, N.Y.
Saxton, J. A. and Lane, J. A.: 1952, ‘Electrical Properties of Sea Water’,Wireless Eng. 291, 269–275.
Schooley, A. H.: 1958, ‘Profiles of Wind-Created Water Waves in the Capillary-Gravity Transition Region’,J. Marine Res. 16, 100–108.
Seltzer, J. E.: 1972, ‘Spatial Densities for Specular Points on a Gaussian Surface’,IEEE Trans. AP-20, 723–731.
Seltzer, J. E.: 1974, ‘A Third-Order Specular-Point Theory for Radar Backscatter’, in Electromagnetic Wave propagation Involving Irregular Surfaces and Inhomogeneous Media, AGARD Conf. Proc. 144, The Hague, Netherlands, Ref. No. 2, 16 pp.
Semyonov, B.: 1966, ‘Approximate Computation of Scattering of Electromagnetic Waves by Rough Surface Contours’,Radio Eng. and Electron. Phys. 8, 1179–1187 (Translation).
Senior, T. B. A.: 1961, ‘Impedance Boundary Conditions for Imperfectly Conductive Surfaces’,Appl. Sci. Res. B8, 418–462.
Shemdin, O. H.: 1972, ‘Wind-Generated Current and Phase Speed of Wind Waves’,J. Phys. Oceanogr. 2, 411–419.
Shmelev, A. B.: 1972, ‘Wave Scattering by Statistically Uneven Surfaces’,Usp. Fiz. Nauk 106, 459–480.
Siegel, K. M.: 1958, ‘Far Field Scattering from Bodies of Revolution’,Appl. Sci. Research B7, 293–328.
Smith, B. G.: 1967, ‘Geometrical Shadowing of a Random Rough Surface’,IEEE Trans. AP-15, 668–671.
Stogryn, A.: 1967, ‘The Apparent Temperature of the Sea at Microwave Frequencies’,IEEE Trans. AP-15, 278–286.
Stratton, J. A.: 1941,Electromagnetic Theory, McGraw-Hill, New York, N.Y., 615 pp.
Strutt, J. W. (Lord Rayleigh): 1894,The Theory of Sound, Macmillan, London, 480 pp.
Tyler, G. L., Teague, C. C., Stewart, R. H., Peterson, A. M., Munk, W. H., and Joy, J. W.: 1974, ‘Wave Directional Spectra from Synthetic Aperture Observations of Radio Scatter’,Deep-Sea Res. 21, 989–1016.
Valenzuela, G. R.: 1967, ‘Depolarization of E.M. Waves by Slightly Rough Surfaces’,IEEE Trans. AP-15, 552–557.
Valenzuela, G. R.: 1968, ‘Scattering of Electromagnetic Waves from a Tilted Slightly Rough Surface’,Radio Sci. 3, 1057–1066.
Valenzuela, G. R.: 1970, ‘The Effective Reflection Coefficients in Forward Scatter from a Dielectric Slightly Rough Surface’,Proc. IEEE 58, 1279.
Valenzuela, G. R.: 1974, ‘The Effect of Capillarity and Resonant Interactions on the Second-Order Doppler Spectrum of Radar Sea Echo’,J. Geophys. Res. 79, 5031–5037.
Valenzuela, G. R.: 1976, ‘The Growth of Gravity-Capillary Waves in a Coupled-Shear Flow’,J. Fluid Mech. 76, 229–250.
Valenzuela, G. R. and Laing, M. B.: 1970, ‘Study of Doppler Spectra of Radar Sea Echo’,J. Geophys. Res. 75, 551–563.
Valenzuela, G. R. and Laing, M. B.: 1972, ‘Nonlinear Energy Transfer in Gravity-Capillary Wave Spectra, with Applications’,J. Fluid Mech. 54, 507–520.
Valenzuela, G. R. and Wright, J. W.: 1976, ‘The Growth of Waves by Modulated Wind Stress’,J. Geophys. Res. 81, 5795–5796.
Valenzuela, G. R., Laing, M. B., and Daley, J. C.: 1971, ‘Ocean Spectra for the High Frequency Waves as Determined from Airborne Radar Measurements’,J. Marine Res. 29, 69–84.
Wagner, R. J.: 1967, ‘Shadowing of Randomly Rough Surfaces’,J. Accoust. Soc. Amer. 41, 138–147.
Walsh, E. J.: 1974, ‘Analysis of Experimental NRL Radar Altimeter Data’,Radio Sci. 9, 711–722.
Ward, J. F.: 1969, ‘Power Spectra from Ocean Movements Measured Remotely by Ionospheric Radio Backscatter’,Nature 223, 1325–1330.
Wentz, F. J.: 1975, ‘A Two-Scale Scattering Model for Foam-Free Sea Microwave Brightness Temperatures’,J. Geophys. Res. 80, 3441–3446.
Wright, J. W.: 1966, ‘Backscattering from Capillary Waves with Application to Sea Clutter’,IEEE Trans. AP-14, 749–754.
Wright, J. W.: 1968, ‘A New Model for Sea Clutter’,IEEE Trans. AP-16, 217–223.
Wright, J. W. and Keller, W. C.: 1971, ‘Doppler Spectra in Microwave Scattering from Wind Waves’,Phys. Fluids 14, 466–474.
Wu, S. T. and Fung, A. K.: 1972, ‘A Noncoherent Model for Microwave Emissions and Backscattering from the Sea Surface’,J. Geophys. Res. 77, 5917–5929.
Yaplee, B. S., Shapiro, A., Hammond, B. D., and Uliana, E. A.: 1971, ‘Nanosecond Radar Observations of the Ocean Surface from a Stable Platform’,IEEE Trans. GE-9, 170–174.
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Valenzuela, G.R. Theories for the interaction of electromagnetic and oceanic waves — A review. Boundary-Layer Meteorol 13, 61–85 (1978). https://doi.org/10.1007/BF00913863
Received:
Issue Date:
DOI: https://doi.org/10.1007/BF00913863