ISAR Echoes Coherent Processing and Imaging

• 作者: BAOZheng LANJinqiao LIAOGuisheng XINGMengdao
• 来源期刊: 电子学报(英文版)
• 学科: 工学
• 关键词: ISAR 逆合成孔径雷达 图像处理 RID 瞬时多普勒效应
• 年，卷（期）: 2004,（2）
• 页码范围: 187-193
• 页数: 7页
• 分类号: TN957.52|TN958
• 语种: 中文

摘要

The general approach to ISAR imaging is Range-doppler (RD) imaging approach. For this approach,the Translational motion compensation (TMC) is firstly obtained by envelope alignment and autofocus, so the target can be treated as a rotating target for the next processing. But in this method, scatterers'''' Migration through resolution cells (MTRC) caused by rotational motion is neglected. However in practice, MTRC exists with the improvement of resolution or for big target. For MTRC compensation, the keystone transformation in SAR is used inthis paper. Before the keystone transformation, it is demanded that the rawdata is coherent, while in fact, the ISAR rawdata is usually not. So a coherent processing of rawdata is proposed. In this paper, the coherent processing of rawdata is firstly done and the next step is to correct MTRC. After using multi-component Amplitude modulation and Linear frequency modulation (AM-LFM) parameter estimation method, the Range-Instantaneous Doppler(RID) ISAR image is obtained. The effectiveness of this algorithm is validated by the processing of simulation data.