Abstract
Based on induced currents of cone-shaped targets, the high precise scattering center model is derived in this paper. The distribution characteristics of the induced currents and their relationships with the attributes of scattering centers are investigated in detail; the high precise scattering center model is obtained. In order to validate the scattering center model, numerical simulations of two cone-shaped targets are presented, and the accuracies of the models are validated through comparing the range profiles simulated by the models with those by a full-wave numerical method. The validation results demonstrate that this model is superior to the existing model in precisely characterizing the scattering centers induced by creeping waves.
Highlights
Scattered fields of radar targets at sufficiently high frequencies can be approximated as the sum of scattered fields from individual scattering sources, and these scattering sources are generally called scattering centers [1]
International Journal of Antennas and Propagation determined by one-dimensional (1D) currents on the lines in the plane constructed by the line of sight (LOS) and the rotational axis of the cone
SC1 locates at contributed by the the top of the cone, components pSC2 of which is mainly L1 and L1; SC2 locates at edges of the bottom in lit region, which is mainly contributed by the components pSC5 of L1 and I1; SC3 locates at edges of the bottom in shadow region, which is mainly contributed by the components pSC5 of L1 and I1; ScoCn4tlroibcuatteesdobuytsthideectohme pgeoonmenettsrpy SoCf t2hoefcIo1naen,dwIh1ic,hthisamt isa,itnhlye creeping waves in the shadow region
Summary
Scattered fields of radar targets at sufficiently high frequencies can be approximated as the sum of scattered fields from individual scattering sources, and these scattering sources are generally called scattering centers [1]. The existing scattering center models for monostatic radar configuration include the damped exponential model [9, 10], the geometrical theory of diffraction (GTD) based model [11, 12], the attributed scattering center model [13,14,15], and the sliding scattering center model [16] These scattering center models are all developed for scattering problems of high frequency, such as specular reflection by large-scale smooth surface or diffraction by large-scale straight edge. There are no generalized analytical solutions for these kinds of scattering problems To tackle this problem, the models of the induced currents on the target are built at first; the scattering center model is derived by the electric field integral expression based on the current model.
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