机动目标ISAR超分辨成像的分辨能力研究

机动目标ISAR超分辨成像须考虑三维转动造成多普勒频率的时变性质,同时,成像质量也受到信号模型误差的影响,如包络对齐误差和自聚焦误差.采用误差参数和目标特征参数联合估计可显著提高机动目标成像的分辨率.本文将误差参数和目标参数联合建模,对信号模型解的不唯一性提出一种约束条件,引入分辨能力的概念,综合分析了存在这些因素时成像分辨率所受到的限制.

The Resolution Ability of the Super-resolution ISAR Imaging of Maneuvering Targets

In the ISAR imaging of maneuvering targets, the time varying Doppler spectrum must be taken into account to produce a focused image,and above all,motion induced errors,such as envelope alignment errors and auto focusing phase errors,must be compensated to get a high quality image.In this paper, a signal model is first established in which the motion compensation errors and the feature of the target are both treated as parameters to be estimated,then a parameter constraint is proposed to cope with the uncertainty in the signal model,and finally the resolution ability of the super resolution algorithm in the established signal is analyzed.