A Novel Azimuth Doppler Signal Reconstruction Approach for the GEO-LEO Bi-Static Multi-Channel HRWS SAR System

A Novel Azimuth Doppler Signal Reconstruction Approach for the GEO-LEO Bi-Static Multi-Channel HRWS SAR System
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GEO-LEO双基地多通道HRWS SAR系统方位多普勒信号重建新方法

DOI:
10.1109/access.2019.2904653
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发表时间:
2019-03
期刊:
影响因子:
3.9
通讯作者:
Chen Junli
Chen Junli
中科院分区:
计算机科学3区
文献类型:
--
作者:
Zhang Shuang-Xi;Li Shaojie;Liu Yanyang;Xing Meng-Dao;Chen Junli

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针对地球同步低轨(GEO-LEO)双基地多通道高分辨率宽测绘带合成孔径雷达(HRWS SAR)系统,提出了一种基于方位多普勒线性调频傅里叶变换域等效基线近似的方位多普勒信号重建算法。GEO-LEO双基地多通道HRWS SAR系统的主要困难是方位向信号重构时,在常规多普勒傅里叶变换域中基线随场景变化。该方法首先利用线性距离徙动校正和线性调频傅里叶变换获得粗聚焦模糊SAR图像。更重要的是,基线分量可以近似为整个图像场景的均匀基线长度,并且可以使用可用的多普勒信号重建方法来重建模糊的多普勒频谱。最后,仿真GEO-LEO双基地多通道HRWS SAR系统的实验结果验证了理论研究和所提出的方法。
For the geosynchronous-low earth orbit (GEO-LEO) bi-static multi-channel high-resolution and wide-swath synthetic aperture radar (HRWS SAR) system, a novel azimuth Doppler signal reconstruction algorithm is developed based on an equivalent baseline approximating in the azimuth Doppler chirp Fourier transform domain. The main difficulty for the GEO-LEO bistatic multi-channel HRWS SAR system is that the baseline is variant with the scene in the conventional Doppler Fourier transform domain during azimuth signal reconstruction. The developed approach first employs the linear range cell migration correction and chirp Fourier transform to obtain the coarse-focused ambiguity SAR image. More importantly, the baseline component can be approximated a uniform baseline length for the whole image scene and the ambiguous Doppler spectrum can be reconstructed using the available Doppler signal reconstruction approach. Finally, the experimental results for a simulation GEO-LEO bi-static multi-channel HRWS SAR system are employed to validate the theoretical investigations and the proposed approach.
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