基于方位相位编码的脉内聚束SAR成像方法  

Intra-pulse Spotlight SAR Imaging Method Based on Azimuth Phase Coding

作　　者：吴玉峰 叶少华 冯大政[2] Wu Yufeng;Ye Shaohua;Feng Dazheng(A VIC Leihua Electronic Technology Research Institute,Wuxi 214063,China;National Laboratory of Radar Signal Processing,Xidian University,Xi＇an 710071,China)

机构地区：[1]中国航空工业集团公司雷华电子技术研究所,无锡214063 [2]西安电子科技大学雷达信号处理国家重点实验室,西安710071

出　　处：《雷达学报（中英文）》2018年第4期437-445,共9页Journal of Radars

基　　金：航空基金(2015ZC07005)~~

摘　　要：脉内聚束模式有效克服了星载合成孔径雷达(Synthetic Aperture Radar,SAR)高分辨率与宽测绘带之间的矛盾,同时可以兼顾回波的信噪比。然而距离维空域滤波的信号分离方法容易受地形起伏的影响,甚至失效。针对此,该文提出了一种结合方位相位编码(Azimuth Phase Coding,APC)的脉内聚束SAR成像方法,利用APC技术使不同子脉冲回波的方位频谱处在不同的脉冲重复频率(Pulse Repetition Frequencies,PRF)范围,然后利用方位自适应波束形成技术来分离回波信号。文中对信号分离方法以及频移因子的选择进行了详细的讨论。最后仿真实验结果验证了所提方法的有效性。The intra-pulse spotlight imaging mode can effectively overcome the contradiction between high resolution and wide swath in spaceborne Synthetic Aperture Radar （SAR）, and considers the echo＇s signal-to- noise ratio. However, signal division by spatial filtering along the range direction may be impacted by fluctuating terrain. To solve this problem, a novel intra-pulse spotlight imaging method based on Azimuth Phase Coding （APC） is proposed in this paper. Using APC, the azimuth spectrum of echo data from different sub-pulses will locate in different Pulse Repetition Frequencies （PRF）. As such, the signal can be divided using an azimuth adaptive beamforming technique. The signal separation method and selection of the shift factor are discussed in detail. Finally, simulation results demonstrate the effectiveness of the proposed method.

关 键 词：合成孔径雷达 脉内聚束模式 方位相位编码 方位多通道 信号分离 

分 类 号：TN958[电子电信—信号与信息处理]