IOSR Journal of Electrical and Electronics Engineering (IOSR-JEEE) e-ISSN: 2278-1676,p-ISSN: 2320-3331, Volume 9, Issue 5 Ver. III (Sep – Oct. 2014), PP 27-32 www.iosrjournals.org www.iosrjournals.org 27 | Page Design and Optimal Control of Line of Sight Stabilization of Moving Target Ajeet Singh 1 , Ritula Thakur 2 , Dr. S. Chatterjee 3 M.E Student 1 , Assistant Professor 2 , Professor and Head 3 Department of Electrical Engineering, NITTTR, Chandigarh Abstract: The Line-of-Sight stabilization and tracking control based on gyro stabilized platform is required to isolate Line of sight from the movement and vibration of carrier and ensure pointing and tracking for target in electro-optical tracking system. This work describes the design of a high performance controller for an electro- mechanical target tracking system with an optical sensor for sighting. The control law has been obtained using a linear model of the electro mechanical system. The modelling of the system has been carried out using the experimental frequency response data. The PID adesigning of control system methodology has been used to design the controller and study the comparative analysis using both controller and optimized tuned performance is also seeing by using the designing the PID controller in different loop analysis and study responses of system by using step response and frequency response analysis by using the bode diagram so as to stabilize the line of sight stabilization and tracking control system. The mixed sensitivity optimisation problem has been posed and weighting functions are selected by using the gradient and dissent method having more numbers of iterations so that they not only encapsulate all the design goals but also accommodate the modelling uncertainties. A stabilising controller with excellent robustness properties has been obtained. Investigator has used MATLAB for the designing of controller and simulated the system for a required criterion of the system. Keywords: controller, stabilization, optimal, lag, lead I. Introduction The Line-of-Sight is the vector drawn between an imaging sensor and target. Electro-optical (EO) imaging sensors mounted on a mobile platform usually require some form of control to stabilize the sensor pointing vector along the target LOS[1][2][3]. Such a system is termed as LOS Stabilization System. It is an essential feature of electro- optical imaging tracking system on a movable carrier, such as infrared missile seeker, airborne electro-optical detector, etc. This technology is applied to isolate the LOS of sensor from carrier disturbance, in order to guarantee accurate aiming and tracking for the target in inertial space. LOS stabilization takes the rate gyro is a type of gyroscope, which rather than indicating direction, indicates the rate of change of angle with time[4]. Rate gyro is used to measure a rate of angular moment which is mounted on the stabilized axis as the speed sensor of inertial space to compose of the inertial platform. The control system manipulates the platform, which is driven directly by DC motor, and keeps LOS of imaging sensor stabilized. The stabilization system must limit the amount of image motion in the field of view of the optical sensor during a frame i.e. sensor integration period. The allowable jitter is a function of the sensor resolution and beam width of the pointing device, and these in turn are usually determined by the angular substance of the target at the desired operating range. The torque disturbances in the system can be due to bearing and motor friction, unbalanced aerodynamics, vibration forces from on-board mechanisms, spring torque forces from wires or flexures or due to some non-intuitive torques. In design of tracking system controller design is carried out for two-axis gimbals[5]. The LOS is stabilized in elevation as well as in azimuth with a high degree of disturbance in both the axes. High precision two-axis gimbals are engineered with very good stiffness properties. The inertial rate of the payload is sensed by very high performance dynamically tuned gyros (DTG), which are characterized by very low drift values of the order of 0.00001 deg. /sec. Two stabilization loops work simultaneously for the overall stabilization of the optical sensor in the space. The plant model is generated using experimental frequency response data. Design of control system for tracking of moving target is a significance of video surveillance. The system works on the principle of closed loop servo control[6]. A complete electro-optical tracking system consists of an imaging sensor (typically CCD), which is mounted on a two-axis stabilized servo platform, and a tracker, which controls the position of the platform, based on the scene observed through the imaging sensor[7]. In the case of a manual tracking system, an operator controls the position of the platform (via joystick, etc.) based on the image observed via a video monitor[8]. In this way, the operator will attempt to drive the platform so that the object of interest is fixed on the bore sight .In the case of an automatic tracking system, the operator is replaced by an electronic system which processes the video images directly in real-time to ascertain the position of a designated object with respect to the sensor bore sight[9][10]. This error is then used to control the platform such that the platform and attached sensors accurately follow the target. Line of sight stabilization is