| With the development of the satellite communication technology, and the requirement of mobile satellite communication increasing, satellite communication based on the mobile carriers has become a hotspot in the fields of communication and control. The key technology——tracking and stabilizing control, is used in order to isolate the disturbance from thecarriers and maintain the antenna in alignment with a satellite, as well promise the communication quality.This paper is under the background of the research in satellite communication system based on the moving vehicles. The most attention is paid to the tracking and stabilizing technology, and what have been done as follows:Firstly, overall program has been presented through deeply analyzing the system functional index, which includes a three-axis stabilized platform based on electronic compass, gyroscopes and stepping motors. This system also establishs the closed-loop feedback stabilized control method, which is based on the speed (gyroscopes' outputs), position (electronic compass' output) and AGC value.Secondly, the design of three-axis stabilizing and tracking mechanical structure has been ascertained, as well sensors and motors which is fit to this system. The method of picking AGC value, which is adapted to the system, has been ascertained through analyzing and comparing several different AGC value picking methods.Thirdly, according to the said design goal and functional requirements of the system, the method of modular design has been adopted and the controller based on the control chip of high-performance DSP TMS320F2812 has been designed ,as well the achievement of PCB board.At last, the system's software module, which is matching the hardware module, has been designed and debugged, the results confirm the feasibility of the design program of the system controller. An improved program has been presented according to the problems generated from the process of system debugging. |
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