Abstract: l1 regularization based multichannel sliding spotlight synthetic aperture radar (SAR) imaging method is proposed. The proposed method combines the displaced phase center antenna (DPCA) technology with the l1 regularization scheme to solve the azimuth ambiguities problem caused by nonuniform sampling, and introduces azimuthrange decouple algorithm to reduce the computational complexity. In the case of more serious nonuniform sampling compared with the matched filter bank algorithm based on Doppler spectrum reconstruction, the proposed method can suppress azimuth ambiguities more effectively and shows potential in achieving wider range swath. In addition, the method can suppress the noise and sidelobe and improve the target to background ratio, which means the imaging performance is improved. The effectiveness of the proposed method is verified by simulation and actual data experiments.