基于扩展距离像序列的ISAR成像相位补偿方法

逆合成孔径雷达（inverse synthetic aperture radar， ISAR）相位补偿算法对成像结果具有重要影响。首先从ISAR成像原理出发推导了相位误差产生原因,针对多普勒中心跟踪法，分析了横向交叉项对多普勒中心的影响，采用CLEAN算法分离了距离单元内强散射中心簇，构建了扩展距离像序列，提出了基于扩展距离像序列的相位补偿方法，有效地减小了横向交叉项对多普勒中心的影响，提高了相位误差估计精度。成像结果表明，该方法能够较好地补偿ISAR成像中的相位误差，噪声环境下优于其他方法。

Phase compensation in ISAR imaging based on expanded range profile

The phase compensation has a great impact on inverse synthetic aperture radar (ISAR) imaging results. The cause of phase errors according to the ISAR imaging theory is derived. For Doppler centroid tracking phase compensation algorithm, the influence of the cross intersection of different scattering centers on the Doppler centroid is analyzed. The paper separates the multi-scattering clusters based on the CLEAN algrithm. And the expanded range profile is established. A new compensation algorithm based on the expanded range profile is proposed. The algorithm can decrease the intersection effects on Doppler centroid caused by the multi-scattering centers. The phase error compensation precision is promoted. The experiment result shows that the algorithm has a good performance in phase error compensation of ISAR imaging, especially in the noisy environment.