Compound Scattering Matrix of Targets Aligned in the Range Direction

概要

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The Sinclair scattering matrix is defined in a fixed radar range. If a radar target extends in the range direction, the reflected signal or the compound scattering matrix will undergo interaction of multiple reflections. Sinece scattering matrix is subject to target parameters such as shape, size, orientation, material, and redar paramenters as frequency, polarization, and incidence angle, it is difficult to specify a representative scattering matrix of a general target. Therefore we choose the simplest target, wire, and its scattering matrix to examine the effect of targets aligned in the range direction with respect to the compoud scattering matrix. First, we present a simple formula for the compound scttering matrix of wires with the phase difference due to spacing. Then, we employed the FDTD method to exmine the scattering phenomena, changing the spacing in the range direction. The FDTD result reveals that two wires can become sphere (plate) and dihedral corner reflector (diplane) component generators; and that four wires can become a good helix component generator. These phenemena are verified with a laboratory measurement. From the result, the traget decomposition should be carefully carried out in terms of range. If a range resolution of a radar is not high enough, the scattering matrix of the desired target may be affected by the targets behind.
社団法人電子情報通信学会の論文
2001-01-01