基于方位dechirp处理的SAR实时成像研究  

Research on the Real-time Imagine Formation of SAR Based on Azimuth Dechirp Processing

作　　者：王涛[1] 王晓峰[1] 

机构地区：[1]南京电子技术研究所,南京210039

出　　处：《信息化研究》2017年第6期13-16,共4页INFORMATIZATION RESEARCH

摘　　要：文章首先简要阐述了dechirp成像原理,在此基础上,分析了方位dechirp之后的信号分辨率与采样率,并推导了方位信号频域采样对应的时域间隔。根据成像原理,利用仿真数据进行了测试验证,最后,对不同方位位置点目标的方位分辨率进行了研究,由于方位dechirp处理必然存在频谱混叠,提出了利用FIR滤波器抑制方位混叠,并利用实测数据进行了验证。验证结果表明,此方法简单高效,具有很强的鲁棒性。基于方位dechirp处理的SAR成像,具有非常强的实际应用价值,已经成功应用于雷达工程实现中。The ultimate principle of dechirp imaging is described firstly. Based on that, the resolution and sampling rate after azimuth dechirp processing is analyzed and the relationship between frequency domain interval and time interval is deduced. According to the imaging principle, imaging processing is carried out by using simulation data. The institute of azimuth spectrum overlapping is discussed. Due to the necessity of azimuth spectrum overlapping, the FIR filter is proposed to suppress the overlapping. This method is verified by measured data. The test result shows that the method is simple, effective and robust. The SAR imaging based on azimuth dechirp has practical application value and is already applied successfully in radar system.

关 键 词：方位dechirp 方位分辨率 频谱混叠 FIR滤波器 

分 类 号：TN959[电子电信—信号与信息处理]