基于时频分析的微动弹道目标ISAR成像方法

摘要

When ballistic target is moving with micro-motion,the Doppler frequency of its scattering points will be modulated by micro-motion which will have negative effect on imaging.In this article,a new meth-od called time selection imaging based on abor transformation formula is put forward,which will focus im-age effectively.The proposed method seerches the Ddoppler fraguency in time quantum of syraight line ap-proximation in time-frequency domain for the target And the effectiveness of this method is verifies by simulation.%为克服弹道目标在微动情况时，其散射点的多普勒频率会随微动而变化，最终影响弹道目标的成像质量问题，提出了利用abor变换进行时间选择成像的方法。通过时频分析的方法，在时频域上找寻多普勒频率近似于直线变化的时间段，并在此时间段中对目标进行成像。仿真结果表明：在目标存在微动情况下，选择多普勒频率近似为直线的时间区间进行成像，能有效地聚集ISAR成像，仿真分析验证了该方法的有效性。