Abstract
Rice leaf scattering contributes substantially to total vegetation canopy backscattering. A modified Physical Optics (PO) approximation model and a specified Discrete Dipole Approximation (DDA) model have been developed that involves parabolic leaf curvature effects. Three typical leaves are chosen among 1433 pieces of parabolic leaves sampled in a ground measurement. PO, DDA, Generalized Rayleigh Gans (GRG) approximation, were used to calculate the leaf scattering, respectively. The method of moments (MOM), a computational electromagnetic method, is utilized to evaluate each models' accuracy. Validation work is conducted under the incidence angles 10° ∼ 60°, incidence azimuthal angle 0° ∼ 360°, incident frequencies L Band (1.2 GHz), C Band (5.4 GHz) and X Band (9.65 GHz). Compared with DDA and GRG, the modified PO model presents the maximum accuracy in >84% testing cases, and retains the high accuracy in both the low and high frequency band.
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