Coherent FSOC system based on improved Adam optimizer and SPGD algorithm

The invention provides a coherent FSOC system based on an improved Adam optimizer and an SPGD wavefront distortion correction method. According to the system, wavefront distortion is compensated through a wavefront-sensor-free AO correction unit based on the improved Adam optimizer and the SPGD algorithm. An error between a light spot position and a reference light spot position is detected in real time by using a far-field camera, a wavefront controller based on an optimization algorithm calculates a target function according to a system performance index obtained by a CCD, the optimization algorithm is driven to update a control voltage of a DM, and closed-loop correction of a distorted light beam is realized in a loop iteration mode. After distortion correction is carried out through the wavefront sensor-free AO system, the performance of the coherent FSOC system can be effectively improved. The wavefront sensor does not need to be used in the aberration correction process, the structure is simple, the cos