Surface wind measurements by radiometer-polarimeters in frame of Russia airspace programs

Kravtsov, Yu. A.; Kuźmin, Alexey V.; Pospelov, M.N.; Смирнов, А. И.

doi:10.1109/igarss.1996.516695

Cited by 1 publication

(3 citation statements)

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“…Difficulties associated with principle value integration of the self terms in the above formulation motivate a transformation to the Stratton-Chu integral equations, as discussed in [29]. The equations then become (8) in region 0 above the surface profile and (9) Applying the MOM to these equations requires expansion of the four unknown scalar functions on the surface into pulse basis functions as…”

Section: Integral Equation Formulationmentioning

confidence: 99%

“…For the simulations of this paper, computational requirements limit surface sizes to 8 8 or 64 64 points, so a radius spot size on the surface was chosen to provide sufficient field attenuation at surface edges. This choice of implies that ocean length scales larger than 3 wavelength will not be resolved but will appear rather as "tilting" effects, so the simulations of Section IX will be include only surface length scales smaller than 3 .…”

Section: Tapered Incident Fieldmentioning

confidence: 99%

“…Monte Carlo simulations are applied for the Durden-Vesecky ocean spectrum discussed in [23] since this spectrum has been used in previous studies [10], [11]. The influence of differing ocean length scales is studied, and predictions are compared with those of the standard approximate theories, although the large computational requirements associated with 2-D penetrable surface simulations limit maximum SMFSIA surface sizes to 8 8 electromagnetic wavelengths and the small azimuthal variations that occur (usually less than 1.5 K) make accurate calculations difficult. These limitations allow only the high-frequency portion of the ocean spectrum to be studied, resulting in small rms height surfaces in the simulations.…”

mentioning

confidence: 99%

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A numerical study of ocean polarimetric thermal emission

Johnson

Shin

Kong

et al. 1999

IEEE Trans. Geosci. Remote Sensing

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A numerical model for polarimetric thermal emission from penetrable ocean surfaces rough in two directions is presented. The numerical model is based on Monte Carlo simulation with an iterative version of the method of moments (MOM) known as the sparse matrix flat surface iterative approach (SMF-SIA), extended to the penetrable surface case through a numerical impedance boundary condition (NIBC) method. Since the small U U U B B B brightnesses obtained from ocean surfaces (usually less than 1.5 K, or 0.5% of a 300-K physical temperature) require extremely accurate simulations to avoid large errors, a parallel version of the algorithm is developed to allow matrix elements to be integrated accurately and stored. The high accuracy required also limits simulations to near flat surface profiles, so that only high-frequency components of the ocean spectrum are modeled. Variations in nadir polarimetric brightness temperatures with spectrum low-and high-frequency cutoffs show the Bragg (or shortwave) portion of the spectrum to contribute significantly to emission azimuthal signatures, as predicted by the small perturbation or composite surface approximate theories. Quantitative comparisons with approximate methods show perturbation theory to slightly overestimate linear brightness temperatures, but accurately predict their azimuthal variations, while physical optics (PO) significantly underestimates both linear brightness temperatures and their azimuthal variations. Further simulations with the numerical model allow sensitivities to ocean spectrum models to be investigated and demonstrate the importance of an accurate azimuthal description for the ocean spectrum.

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Section: Integral Equation Formulationmentioning

confidence: 99%

Section: Tapered Incident Fieldmentioning

confidence: 99%