The Construction On Antenna Tracking System Of Maritime Satellite Mobile Terminal

The launch of Broadband Global Area Network service ensures the meaning of researching antenna tracking system of maritime satellite mobile terminal and its broad market prospects.On the basis of Maritime Satellite System analysis,this project attaches its importance to the antenna tracking system.Through the analysis of several kinds of current satellite terminal products as well as the summary of the methods of feasible antenna auto-tracking,our research is carried out by dividing the tracking system into two parts,auto-tracking and stability compensation.After the comparison of five auto-tracking methods,we put forward the optimal tracking scheme and chose the strap-down stability compensation method for its low cost,superior performance as well as convenient installation.In system implementation,we had an analysis of the tracking system of Demark TT's F33 terminal equipment from the aspects of the hardware structure,working principles and the existing problems.Referred to its system components,we divided our own system into two parts,hardware and software.This paper pays more attention to the hardware design and divides the system into several modules for design and implement.TI's TMS320F2812 is chosen as a processor to control the stepper motor, acquire and process the signal of gyro sensors,acceleration sensors and GPS,realize the algorithm of auto tracking and stability compensation.On the foundation of a better understanding of all the parts,we chose suitable devices,drew the corresponding schematics and made PCB.What's more,we programmed software for testing, debugged the whole system and finally completed a feasible hardware platform.In order to use the system resources more rationally and improve the real-time capability, we substituted popular embedded operation systemμC/OS-Ⅱfor traditional foreground/background system.After studying with great care,we transplantedμC/OS-Ⅱonto F2812 successfully.This research provides a platform for the programming of application software,shortens the development cycle and gives convenience to system upgrade and maintenance.This paper realizes the construction of antenna tracking system of maritime satellite mobile terminal.A more integrated tracking system starts to take shape.The research lays the foundation for a further research of maritime tracking products and its localization.