Long Baseline Linear Array SAR Signal Reconstruction and Imaging

Due to the minimum antenna area constraint, conventional single-satellite SAR cannot obtain the image with wide swaths as well as high-resolution. This problem can be solved by using single-platform multi-phase center SAR or constellation SAR, which divides the large antenna into small antennas. Compared with single-platform multi-phase center SAR, there are several advantages but also challenges for constellation SAR. In this paper, point-target imaging simulations are performed for linear array constellation SAR with long baseline. And the effect of the long baseline on imaging is discussed. And then the methods to overcome the effect and to reconstruct the unambiguity signal is given.