An obstacle avoidance and circle trajectory following controller is proposed for differential driving nonholonomic robot with inaccurate insatiable limited feedback information from monocular pan-tilt camera.Firstly,an elementary circle trajectory following controller to solving the stability problem of the system.based on the Lyapunov theory is desig.ned,Secondly,a variable guided-angle solving the view angle limitation problem and optimizing path trajectory.is proposed to tune the elementary controller pa...