In cruise phase,high-speed supercavitating vehicles( HSSV) face a strong nonlinear planing force and noise disturbance. To solve these problems,a synthesis method for robust H∞absolute stability controller was proposed based on absolute stability in the time domain. The original system was transformed into a cascade connection of two subsystems. Then,based on the connection,the sector bounded conditions of the planing force were analyzed. Next,in order to handle the noise disturbance,the method was included...