前视多通道合成孔径雷达解模糊成像方法  

Ambiguity Resolving and Imaging Algorithm for Multi-channel Forward-looking Synthetic Aperture Radar

作　　者：卢景月 张磊[1] 王冠勇 LU Jingyue;ZHANG Lei;WANG Guanyong(National Key Laboratory of Radar Signal Processing,Xidian University,Xi＇an 710071,China)

机构地区：[1]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：《电子与信息学报》2018年第12期2820-2825,共6页Journal of Electronics & Information Technology

基　　金：国家自然科学基金(61771372;61771367)~~

摘　　要：传统合成孔径雷达方位向分辨率仅由合成孔径提供,但在正前视区域多普勒分集有限,成像性能迅速下降且前视成像也存在固有的左右多普勒模糊问题。针对上述问题该文讨论前视多通道合成孔径雷达系统模型,提出一种理想直线航迹下空域零点约束自适应波束形成的成像方法,有效综合阵列实孔径和合成孔径提高正前视区域的成像质量,利用有限阵列空域自由度实现左右多普勒解模糊。首先对回波数据大前斜成像处理,得到左右模糊的图像,然后进行波束形成,将各通道图像加权并且相干累加,实现左右多普勒解模糊以及方位分辨率增强。仿真实验表明空域零点约束自适应波束形成的成像方法可对前视场景进行高分辨成像。The azimuth resolution of traditional synthetic aperture radar is only provided by synthetic aperture. However, in the forward looking area, the Doppler diversity is limited, so the imaging performance declines rapidly. And forward looking imaging also has the Doppler ambiguity problem. In this paper, an adaptive beam forming method with spatial confinement under ideal line track is proposed. The imaging quality of the positive forward region is improved effectively by combining the array of real aperture and synthetic aperture, and the Doppler solution is blurred by using the array space domain. First, the echo data is processed by High Squint SAR imaging to obtain the blurred image. Then the beam-forming is performed, weighted and coherent accumulated with each channel image, so as to resolve Doppler ambiguity and enhance the azimuth resolution. Simulation confirms the validity of the proposed approach.

关 键 词：合成孔径雷达 前视成像 方位向分辨率 多普勒模糊 波束形成 

分 类 号：TN957.52[电子电信—信号与信息处理]