An Azimuth Deramping Method for Spaceborne Sliding Spotlight SAR without Relying on Virtual Rotation Points

With the improvement of the azimuth width and azimuth resolution of the spaceborne SAR, the azimuth scan angle range of the antenna beam increases rapidly, and the beam center deviates significantly from the virtual rotation point under the control of uniform scanning, and the traditional virtual ro...

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Bibliographic Details
Main Authors: Yingying, Li, Shouye, Lv, Wuhao, Yu, Xin, Biao, Zhang, Cuiping, Lian
Format: Conference Proceeding
Language:English
Subjects:
Azimuth
deramping
Doppler aliasing
Doppler effect
Frequency-domain analysis
History
Imaging
Satellites
sliding spotlight SAR
Spaceborne radar
virtual rotation point
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Summary:With the improvement of the azimuth width and azimuth resolution of the spaceborne SAR, the azimuth scan angle range of the antenna beam increases rapidly, and the beam center deviates significantly from the virtual rotation point under the control of uniform scanning, and the traditional virtual rotation point model becomes invalid. At this time, it is impossible to continue to use the virtual rotation point to perform azimuth deramping, and it is difficult to continue to apply the frequency domain imaging algorithm based on azimuth deramping. This paper proposes an improved azimuth deramping technology that does not rely on virtual rotation points. This technology can accurately remove Doppler aliasing caused by beam azimuth scanning and solve the problem of virtual rotation point model failure in sliding spotlight mode with large azimuth scanning angles.
ISSN:2640-7736
DOI:10.1109/Radar53847.2021.10028285