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首页> 外文期刊>Geoscience and Remote Sensing, IEEE Transactions on >Subaperture Approach Based on Azimuth-Dependent Range Cell Migration Correction and Azimuth Focusing Parameter Equalization for Maneuvering High-Squint-Mode SAR
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Subaperture Approach Based on Azimuth-Dependent Range Cell Migration Correction and Azimuth Focusing Parameter Equalization for Maneuvering High-Squint-Mode SAR

机译：基于方位角依赖距离单元偏移校正和方位角聚焦参数均衡的子孔径方法用于机动高斜视模式SAR

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摘要

The challenge in the imaging of high-squint-mode synthetic aperture radar (SAR) mounted on maneuvering platforms is the azimuth dependence of both the range migration and the azimuth focusing parameters (the azimuth frequency-modulation rate and higher order coefficients), which are caused by range walk correction and acceleration. In order to accommodate the dependence, a modified subaperture imaging algorithm is proposed. Based on the fact that the azimuth times corresponding to the same Doppler frequency are different for targets in the same range gate, after making blocks in the azimuth frequency domain, the azimuth-dependent range cell migration correction is performed in the azimuth time domain for each block. Considering that the regions of support in the azimuth frequency domain are different for targets in the same range gate, the equalization of the azimuth focusing parameters is achieved by a new azimuth nonlinear chirp scaling method in the azimuth frequency domain. In order to verify the effectiveness of the proposed algorithm, the simulation of a point target array is presented. Furthermore, the real SAR data with a squint angle of 70° are processed, and high-quality images with a resolution of 1 m are provided.
机译：安装在机动平台上的高斜视模式合成孔径雷达（SAR）的成像挑战是距离偏移和方位角聚焦参数（方位角频率调制率和高阶系数）的方位角依赖性由范围行走校正和加速度引起。为了适应这种依赖性，提出了一种改进的子孔径成像算法。基于相同多普勒频率对应的方位角时间对于相同距离门中的目标不同的事实，在方位角频域中进行块划分之后，针对方位角时域对每个方位角进行距离相关的距离像元迁移校正块。考虑到相同距离门中的目标，方位角频域中的支撑区域不同，因此，通过在方位角频域中使用新的方位角非线性chi缩放方法，实现了方位角聚焦参数的均衡。为了验证所提算法的有效性，提出了点目标阵列的仿真方法。此外，处理了斜角为70°的真实SAR数据，并提供了分辨率为1 m的高质量图像。

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