基于Chirplet的逆合成孔径雷达回波高速运动补偿算法

A High Velocity Motion Compensation Algorithm of ISAR Echo Based on Chirplet Transform

高速运动补偿是恢复距离像分辨率和提高ISAR像清晰度的关键,本文提出了一种新的高速运动补偿算法,通过初像加窗构建了独立特显点回波,避免了多散射点回波相互叠加造成调频特性被淹没的现象,采用chirplet小波分解得到了调频率的估计值,实现了径向速度的正确估计及回波的高速运动补偿,仿真实验表明了本文算法的有效性。

The high velocity motion compensation is the key technique for restoring the profile resolution and improving the clarity of ISAR image. The paper proposed a new compensation method based on chirplet transform. The dominant scattering center echo is reconstructed based on windowed rough ISAR image. And the effect of multi-scattering centers on chirp rate is avoided. By chirplet decomposition,the chirp rate is obtained,the velocity is estimated and the phase error is compensated. The experimental result shows that the algorithm is effective.