The restrictions on the under water applications of the synthetic aperture technique are introduced followed by discussions of an autofocus technique that compensates the motion errors of the platform and the phase differential processing that has been developed to be less sensitive to media turbulence and transducer motion errors 本文讨论的算法已经基本达到了提高成象率以及对媒质扰动和平台运动引起的误差进行补偿的目的。文中还对涉及的算法给出了大量的仿真和详细的分析，为实际应用提供了依据。
