摘要：The net buoyancy of the deep-sea self-holding intelligent buoy(DSIB)will change with depth due to pressure hull deformation in the deep submergence *** net buoyancy changes will affect the hovering performance of the *** make the DSIB have better resistance to the external disturbances caused by the net buoyancy and water resistance,a depth controller was designed to improve the depth positioning based on the active disturbance rejection control(ADRC).Firstly,a dynamic model was established based on the motion analysis of the *** addition,the extended state observer(ESO)and nonlinear state error feedback controller were designed based on the Lyapunov stability ***,semi-physical simulations for the depth control process were made by using the ADRC depth controller and traditional PID depth controller,*** results of the semi-physical simulations indicate that the depth controller based on the ADRC can achieve the predefined depth control under the external *** with the traditional PID depth controller,the overshoot of the ADRC depth controller is 1.74%,and the depth error is within 0.5%.It not only has a better control capability to restrain the overshoot and shock caused by the external disturbances,but also can improve intelligence of the DSIB under the depth tracking task.