Limited by laser modulation technology and the phase information that is easily damaged by atmospheric turbulence, it is difficult to obtain the 2-D high-resolution image using traditional coherent integration algorithms for Inverse Synthetic Aperture Imaging Lidar (ISAIL). To solve this problem, a real envelope imaging algorithm was proposed based on inverse Radon transform. Using the proposed method, the ISAIL system can transmit noncoherent laser pulses and high-quality image can also be obtained under the condition of atmospheric turbulence with low pulse repetition frequency. The ISAIL imaging experiment with numerical data validates the feasibility and effectiveness of the proposed method.