基于复数经验模式分解的非旋转对称空间进动目标回波分离及成像研究
doi: 10.3724/SP.J.1146.2012.00851
Echo Separation and Imaging of Spatial Precession Targets with Unsymmetrical Appendix Parts Based on CEMD
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摘要: 对于非旋转对称的弹道中段目标逆合成孔径雷达成像而言,非旋转对称部件回波分量的存在会严重影响目标主体的成像质量。该文通过建立非旋转对称弹道中段目标的回波模型,分析了导弹主体和导弹非旋转对称部件的回波分量的微多普勒差异,提出了基于复数经验模式分解的非旋转对称部件回波分离方法,利用复数经验模式分解的自适应特性,可以有效地分离和重构主体及非旋转对称部件回波分量。仿真结果表明,利用该文提出的方法可显著提高导弹主体部分的成像质量。Abstract: In the inverse synthetic aperture radar imaging of ballistic mid-course targets with unsymmetrical appendix parts, the image of the main body may be shadowed by the echo component induced by the unsymmetrical appendix parts. In this paper, the echo model of ballistic mid-course targets with unsymmetrical appendix parts is established, and the micro-Doppler difference between the main body and the appendix parts is analyzed. Then, an algorithm utilizing the Complex-value Empirical Mode Decomposition (CEMD) is proposed to separate the echo of the appendix parts. The echo component of the main body and the appendix parts can be separated and reconstructed with the proposed algorithm adaptively. The results of the simulation verify that a much better image of the main body can be obtained after the separation.
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