| With the rapid development of satellite communication and with a large coverage area.communication stability,and good signal quality,satellite communications have been widely used in military,public security,weather,radio and other areas.Satellite antenna is a important part of satellite communication system. The research on satellite antenna servo control system has very important signification.In order to develop the automatic vehicle satellite antenna control system,this paper analysis and research the antenna tracking system,and propose a design based on simple,practical and reliable mechanical,integrated use of GPS,compass, inclinometer and other modern sensors,and the ATmegal280 processor.The program technology is mature,less hardware peripherals and low-cost.Firstly,the paper analyzes the attitude of the antenna,and then drives the satellite tracking angle formula.Secondly,the step tracking,conical scan tracking and mono-pulse tracking are analyzed and compared the strengths and weaknesses. Ultimately the paper determines the gradient method based on step tracking.The greatest advantage of this method is easy to implement,and it will not generate near the extreme swings.Finally,the paper presents the system implementation of projects, including hardware and software.Hardware designs the interface circuit between ATmegal280 and GPS.electronic compass,inclinometer,beacon receiver or digital tuner,including DC motor drive,button,display peripheral circuits.Software designs to achieve a key function.Through a number of environmental and vehicle tests,it shows that the developed system is feasible and effective,and it basically reached the design requirements.The system can meet the fast and accurate targeting satellite under different conditions to ensure the satellite communication system working properly. And the system also used in practice.In the actual a long-term use view,system is reliable stability,high tracking accuracy and low-cost. |
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