基于最大对比度的联合相位误差校正方法

Joint Phase Error Correction Method Based on Maximum Contrast

针对高分辨率逆合成孔径雷达(ISAR)成像过程中,因目标转动所引入的转动相位误差无法被忽略,以及由于转动相位误差使得传统平动相位误差校正方法性能严重下降的问题,提出了一种基于最大对比度的联合相位误差校正的方法,可同时校正残余的平动相位误差和转动相位误差,进一步提高成像的质量。首先利用传统的运动补偿方法对回波信号进行处理,其次根据最大对比度准则,将相位误差校正问题转化为最大对比度优化问题,最后利用改进的拟牛顿算法进行求解。该方法能使高分辨率ISAR进行精准成像,且所得图像聚焦效果良好。通过对仿真数据和实测数据的处理,验证了文中方法的有效性。

In the process of high-resolution inverse synthetic aperture radar imaging(ISAR),the rotational phase error introduced by the target rotation cannot be ignored,and the performance of the traditional translational phase error correction method is seriously reduced due to the influence of the rotational phase error.Therefore,a method of joint phase error correction based on maximum contrast is proposed in this paper,which can correct the residual translational phase error and rotational phase error at the same time,and further improve the quality of imaging.Firstly,the echo signal is processed by the traditional motion compensation method,and then the phase error correction problem is converted into the maximum contrast optimization problem according to the maximum contrast criterion,and finally the improved Quasi-Newtonian algorithm is used to solve it.This method can enable accurate imaging of high-resolution inverse synthetic aperture radar,and the resulting image focusing effect is good.Through the processing of simulation data and real data,the effectiveness of the proposed method is verified.