A high resolution imaging algorithm for synthetic aperture interferometric radiometers in near-field

2017 ◽  
Author(s):  
Fei Hu ◽  
Hao Hu ◽  
Tao Zheng ◽  
Feng He ◽  
Xiaohui Peng
Keyword(s):  
High Resolution ◽  
Near Field ◽  
Synthetic Aperture ◽  
High Resolution Imaging ◽  
Imaging Algorithm ◽  
Resolution Imaging

A High-resolution Imaging Algorithm for MIMO SAR Based on the Sub-band Synthesis in Frequency Domain

2011 ◽  
Vol 33 (5) ◽  
pp. 1082-1087 ◽  
Author(s):  
Yun-kai Deng ◽  
Qian Chen ◽  
Hai-ming Qi ◽  
Hui-fang Zheng ◽  
Ya-dong Liu
Keyword(s):  
High Resolution ◽  
Frequency Domain ◽  
High Resolution Imaging ◽  
Imaging Algorithm ◽  
Resolution Imaging

scholarly journals A Fast High-Resolution Imaging Algorithm for Helicopter-Borne Rotating Array SAR Based on 2-D Chirp-Z Transform

2019 ◽  
Vol 11 (14) ◽  
pp. 1669 ◽  
Author(s):  
Qin ◽  
Li ◽  
Tang ◽  
Zeng ◽  
Li ◽  
...  
Keyword(s):  
High Resolution ◽  
Taylor Series Expansion ◽  
High Resolution Imaging ◽  
Imaging Algorithm ◽  
Range Cell ◽  
Distortion Effect ◽  
Resolution Imaging ◽  
Range Cell Migration ◽  
Azimuth Resolution ◽  
Space Variant

In view of the azimuth resolution of the helicopter-borne rotating array synthetic aperture radar (RoASAR) depending on the azimuth reconstruction angle and the sector distortion caused by the azimuth Deramp processing, this paper proposes an efficient helicopter-borne RoASAR high-resolution imaging algorithm based on two-dimensional (2-D) chirp-z transform (CZT). First, the high-order Taylor series expansion is performed on the slant range, and the accurate 2-D spectral expression of the point target is obtained by using the method of series reversion (MSR). Based on that, the space-variant characteristics of the range cell migration (RCM) terms are analyzed. After that, the space-variant RCM and the sector distortion effect caused by the azimuth Deramp processing are removed by using efficient 2-D CZT, thereby increasing the azimuth reconstruction angle and improving the azimuth resolution. The proposed algorithm is efficient without the interpolation operation, and it is easy to implement in real-time. Finally, the simulations are provided to verify the effectiveness of the proposed algorithm.

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