Hardware Research And Development On The Automatic Tracking Control System Of Shipborne Satellite Communication Based On The Microcontrollers C8051F120

The modern times is the information society of high speed development and people more and more dependent on communication, naturally communication becomes especially important.In a variety of communications,satellite communications with its own unique advantages have occupied the important position,such as satellite communication is not subject to regional restriction, large capacity of communication and flexible.Mostly fixed station satellite communication and the technology is mature,it cannot satisfy the real-time communicate interaction in the movement,especially the sea area of about seventy percent of the total area,the base station cannot be established,the geographical factors hinder the communication with the outside world,making it more difficult to fisherman living and military tasks.Thus the steady shipborne satellite communication system is must.In this paper,we have researched a three-axis servo marine mobile satellite communication earth station and this system can ensure real-time on satellite communication in hull movement.In this research, on the basis of reading a large number of literature, we improve the existing shipborne "mobile communication" system,the research content for the shipborne "mobile communication" system of hardware design, including hardware selection, the design of the circuit diagram, and the hardware configuration of related part of the software design and control principle. The design of shipborne system includes the servo control subsystem, feed subsystem and monitoring subsystem. Servo control subsystem is responsible for handling the sensor data and control the motor rotation to ensure the real-time communication,the feed subsystem is responsible for the signal to send and receive,the monitoring subsystem is responsible for setting up the antenna parameters and real-time monitoring of the antenna. On the selection of hardware, this system has chosen the GPS for three axis absolute geographic coordinates, with the theory of three axis Angle measurement by electronic compass, plus three axis of the instantaneous velocity measurement by three-axis gyroscope in order to achieve the purpose of quick compensation, which can make whole servo system more accurate and fast. In order to overcome interference due to the movement of ocean waves on the ship, the PID algorithm as the control algorithm of this system, the actual measured value of the gyroscope are integral value error Angle, and the error Angle value as input of PID control, motor control to drive the motor rotation, so that the ship can real-time communicate in movement.The shipborne system in three-dimensional motion simulator test environment has been able to achieve accurate for star and communication. Need to install the system in a ship and test in a real environment, convenient for subsequent production work.