A New Model for Sand-Ripple Scattering Based on SSA Method and Practical Ripple Profiles

作者：Wei, Peng-Bo^*; Zhang, Min^*; Jiang, Wang-Qiang^*; Nie, Ding^*

来源：IEEE Transactions on Geoscience and Remote Sensing, 2016, 54(4): 2450-2459.

DOI：10.1109/TGRS.2015.2501400

• Electromagnetic (EM) scattering
• sand ripples
• small-slope approximation (SSA) method

In the former model for sand surface electromagnetic (EM) scattering, the sand ripples are generally viewed as a standard sine-shaped wave surface, which artificially deprives many inherent properties of natural sand ripples. For example, the ripples have two pretty distinct sides: Y-junctions and variable texture directions. For these reasons, these corresponding scattering models deserve doubts to final calculated results. On the other hand, the former models usually are statistical models, which are not favorable in target coupling scattering problems and synthetic aperture radar (SAR) imaging simulations. In this paper, based on the physical mechanism governing the formation of aeolian landforms, sand ripples of actual shape are generated under the discrete models. Furthermore, as the slope of the ripple surface is fully small, facet-based small-slope approximation (SSA) method is unquestionably utilized in the EM scattering studies of sand ripples. Finally, significant differences are shown between the results based on sine-shaped wave surface and practical ripple surface, which proves the necessity of the new model for EM scattering of sand ripples.

• 出版日期2016-4
• 单位西安电子科技大学