Abstract
The modern radar system not only works on the conventional stripmap synthetic aperture radar (SAR) mode, but also on the high-resolution spotlight SAR mode with refined imaging. However, due to the azimuth spectral aliasing of echo signals in the spotlight SAR, the direct stripmap SAR imaging algorithm fails. To solve this problem, a high-resolution spotlight SAR imaging method based on deramp “two-step processing” is proposed. Firstly, the motion error is compensated based on the inertial navigation system (INS) and echo data, then azimuth deramp operation is performed to eliminates the azimuth spectral aliasing, and thus obtain the 2D signal spectrum without blurring. Then the modified Range-Doppler (RD) method is used to complete the range cell migration (RCM) correction and range compression. Finally, azimuth compression is performed by means of azimuth matched filtering to acquire the focused image. In this method, the imaging framework for both the stripmap SAR and the spotlight SAR are unified by the deramp operation without interpolation. The imaging results in the spotlight SAR mode have demonstrated the effectiveness of the method.
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Zheng, H., Chen, H. (2022). A High-Resolution Spotlight SAR Imaging Method Based on Two-Step Processing Approach. In: Wang, L., Wu, Y., Gong, J. (eds) Proceedings of the 7th China High Resolution Earth Observation Conference (CHREOC 2020). CHREOC 2020. Lecture Notes in Electrical Engineering, vol 757. Springer, Singapore. https://doi.org/10.1007/978-981-16-5735-1_11
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DOI: https://doi.org/10.1007/978-981-16-5735-1_11
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