Forward Derivation and Analysis for 3-D Scattering Center Position of Radar Target
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摘要: 为了更好地将散射中心与目标结构联系起来，该文基于目标几何模型给出一种在单次和2次耦合散射机理下雷达目标部件级3维散射中心位置正向推算方法。重点探究了2次耦合散射机理下强散射情况的射线等效位置确定原理及方法。对其他弱散射情况，应用等价变换等效为强散射情况。最后，使用此位置推算方法推导并分析了直角二面角，钝角二面角，SLICY, T72坦克模型的部件级3维散射中心位置，并与相应的仿真或实测SAR图像进行比对以验证此位置推算方法的正确性。Abstract: To link better scattering centers with target structures, a forward method is presented to deduce the component-level 3-D scattering center position of radar target under the mechanisms of single and double scattering based on target geometric model. Under the mechanism of double scattering, the principle and method for determining the ray equivalent position is introduced especially under the situation of strong scattering. As for other weak scattering situations, the equivalent transformation is used to transform the weak scattering situations to the strong one. Finally, this position derivation method is applied to the models of right dihedral angle, obtuse dihedral angle, SLICY and T72 tank to deduce and analyze their component-level scattering center positions. The corresponding simulated or actual SAR images are used for contrast to validate the accuracy of the position derivation method.
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Key words:
- Scattering center /
- Position parameter /
- Forward derivation
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表 1 SLICY实测SAR图像峰值位置与本文方法推算位置对比表
散射源编号 1 2 3 部件 三面角(前右) 顶帽(矮) 顶帽(高) 机理 3次耦合散射 2次耦合散射 2次耦合散射 实测图像八邻域峰值提取位置(m) (–0.0173, –1.3806) (–0.2407, –0.0262) (0.6531, –0.6933) 本文方法推断投影位置(m) (–0.0043, –1.2648) (–0.1798, –0.0683) (0.5791, –0.7669) 位置误差(m) (0.0130, 0.1158) (0.0609, 0.0421) (0.0740, 0.0736) 
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表 2 T72坦克仿真SAR图像主要峰值位置与本文方法推算位置对比表
散射源编号 1 2 3 4 部件 燃料桶(右) 燃料桶(左) 后方挡板(左) 后方挡板(右) 机理 单次散射 单次散射 单次散射 单次散射 仿真图像八邻域峰值提取位置(m) (1.0077, –2.0791) (–1.0594, –2.0791) (–0.4393, –3.1312) (0.3876, –3.1312) 本文方法推断投影位置(m) (1.0075, –2.1394) (–1.0022, –2.1394) (–0.4411, –3.1568) (0.4328, –3.1568) 位置误差(m) (0.0002, 0.0603) (0.0572, 0.0603) (0.0018, 0.0256) (0.0452, 0.0256)
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