金属球在转台逆合成孔径雷达成像中的应用

Application of Metallic Sphere in Rotator ISAR Imaging

根据经典成像公式,用金属球定标,对典型散射体进行成像,发现得到的二维像与预期不一致。分析金属球的散射机理,确定金属球的散射中心位于靠近雷达的表面顶点,而不是球心。据此,重新推导了用金属球定标的转台ISAR(逆合成孔径雷达)成像公式。对典型散射体和模型的实际成像结果表明,得到的二维像与目标投影图位置误差小于2cm,非常有利于目标散射源诊断。

The ISAR images of typical scattering body which processed according to the gene ral ISAR imaging formula and calibrated with metallic sphere, are not as same a s prediction. The fact that the scattering center of the metallic sphere located not at the geometric center but near the surface of the radar was confirmed thr ough analysis to the scattering mechanism of the metallic sphere. Based on this fact, the formula of rotator ISAR imaging which calibrated with metallic sphere was deduced. Application to typical scattering body and real model shows that the deviation between obtained ISAR images and model projection is less than 2 cm, which is good to the diagnosis of scattering center.