An Applied Basic Study Of The Line-of-sight Stabilization Control System Of The Pod

In order to search target, track target and image target accurately, optical imaging systems need to ensure that the Line-of-Sight with respect to inertial space has a certain stability and accuracy and target tracking capability. Therefore, the Line-of-Sight stabilized platform applications pod are born to carry optical imaging system and to achieve the Line-of-Sight inertial stabilization and optical tracking. The topic of this thesis comes from a pod background research outsourcing projects, the paper focuses on the pod control system design;the Line-of-Sight stabilized platform stability mechanism; and the Line-of-Sight stabilization algorithm simulation.1) The overall pod control system is designed according to the function and performance indicators of the pod control system.. The motor, the drive, the resolver and the RDC of the control system of the pod are selected The Stim210 gyro module is selected by a detailed description of MEMS gyroscope, and then angular rate is solved.2)The pod stable platform structure, the relevant coordinates and the coordinate transformation matrix are described in detail. Based on the above, the carrier coupling perturbation theory is analyzed; the Line-of-Sight angular rate compensation stable condition is deduced; and a stability control principle of a pod control system is proposed.3)The mathematical model of permanent magnet synchronous motor and space voltage vector control technology about permanent magnet synchronous motor are elaborated in detail. A current loop model, a velocity loop model and a stabilized loop model in Matlab/Simulink environment are established. Classic PID control algorithm is used to achieve as stable Line-of-Sight stabilization, and simulation analysis shows that the control system of pod has an ability to inhibit the disturbance.4)Disturbance observer + PID control algorithm is proposed to improve the disturbance rejection ratio of the Pod control system and thereby to improve the accuracy of the Line-of-Sight stabilization. The structural characteristics of the disturbance observer are analyzed. The reason why to select the Q(s) as the low-pass filter filters is presented.Pods stable system disturbance rejection and noise suppression capability are affected by Q(s) filter. Q(s) filter is designed by optimization methods. The Line-of-Sight stabilization about a pod is simulated, which shows that the carrier disturbance rejection ratio of a control system of a pod is improved significantly because of the introduction of the disturbance observer. Optical tracking function of a control system of a pod is proposed on the basis of a stable loop. The components of optical tracking and its implementation process are introduced in detail.