Data processing in frequency imaging of circular SAR

This paper proposes an algorithm to process the data acquired of the targets underneath the circular center, which cannot be focused by frequency algorithms directly. Using the vector expression, the azimuth frequency modulation rate is partitioning into velocity and acceleration parts. After compensation of the acceleration parts, the circular path is corrected to a linear path and the frequency algorithms can be used to focus the data. The simulated results are covered to validate the effectiveness of the proposed algorithm.