ISBN: 97-8-93-81195-82-6 Proceedings of NJCIET2015 Canara Engineering College, Mangalore NJCIET-2015 486 Precision Control of Antenna Positioner Using P and PI Controllers Sharon Shobitha.O 1 K.L.Ratnakar 2 G.Sivasankaran 3 1 2 nd Year M. Tech CAID, Sri Siddhartha Institute of Technology, Tumkur -572105, Karnataka, India E-mail: sharon06shobitha1991@gmail.com 2 Professor, Dept of EEE, Sri Siddhartha Institute of Technology, Tumkur -572105, Karnataka, India E-mail: kl_ratnakar@rediffmail.com 3 Consultant in SYSTEM CONTROLS and retired program director for UAV, DRDO, Bangalore -560016, Karnataka, India E-mail: sivasankaran@systemcontrols.com ABSTRACT: Antenna positioners usually used for dynamic tracking and telemetry data purpose, such as data from missiles or aircraft. Hence control system design using servo BLDC motor a PID controller and a gear box for loop stabilization and jitter isolation requirement for both azimuth and elevation has been carried out. And their respective frequency response and time response will be used for the design purpose. Certain non-linearity such as rate disturbance for different frequencies are superimposed in the model to verify the design and evaluate the performance using MATLAB software. Keywords: antenna positioner, BLDC motor, PID controller. 1. Introduction: Antennas are designed to transmit and receive radio waves which are used to track static and dynamic systems like ships, airplanes and guided missiles and also for civil applications as well.Antenna positioning is the interface that positions or steers the antenna in azimuth and elevation planes of operation, in order to provide high reliability while withstanding severe environmental conditions. Positioning systems have been traditionally implemented using DC motors due to the relative ease in controlling them. However, there are still disadvantages in using such motors for positioning systems i.e in particular, for high speed repetitive motion, the brushes are subject to excessive mechanical wear and consequently lead to a decrease in performance. Positioning systems were then implemented using stepper motors but as the rotor follows the command position, if pulse frequency higher than natural frequency of the motor then the rotor will lose synchronization, and the user has no way to be sure that the motor has actually reached the desired position. For the reasons just enumerated positioning systems are now being implemented using servo motors, the main reason to use servo systems is to improve transient response times, steady state errors, to meet the torque and speed requirements and are suitable to run in any environment. PID controller is unquestionably the most commonly used control algorithm. The main reason is its relatively simple structure, which can be easily understood and implemented in practise. As the antenna’s are placed in the open area there will be disturbances occurred such as jitter isolation disturbance, wind load effect, stiffness etc. in this project only the jitter isolation has been carried out. Further we are going to see the proposed system i.e BLDC motor model in section 2, experimental details in section 3. Section 4 contains the conduction procedurethat is the current, velocity and position loop models and the model with disturbance are included , section 5 contains the simulation results obtained for the three loops and the disturbances using software tool called MATLAB. Section 6 contains the conclusion and finally the references.
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ISBN: 97-8-93-81195-82-6 Proceedings of NJCIET2015
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