The satellite antenna is a major component of the satellite communication Due to interference of satellite offsets， and climatic factors， satellite antennas often need to adjust the position and attitude， and target tracking to accurately align the satellite， to provide reliable data This complete set first set up a satellite antenna position control system mathematical model， the system model of the open-loop system， a simple analysis， to discriminant its steady-state Then， then added to the speed loop and position loop to form a closed loop control system， the position feedback and velocity feedback in the time domain and frequency domain analysis of dynamic performance and steady-state performance of the antenna control Finally， the analysis methods of using the root locus analysis of the step disturbance generated by the system， and by setting the controller to suppress the error caused by the MATLAB and SIMULINK as a tool for dynamic simulation model of the antenna position control system in accordance with the mathematical model， simulation and verification of all of the above analysis and system design process， confirmed the validity of the design
GPS is along with the rapid development of modern science and technology and set up a new generation of precision satellite navigation and positioning system has higher precision and observation time is short， the observatory without the sight， between global unity can provide the geocentric coordinate C This paper Outlines the development of GPS positioning system， this paper introduces the GPS positioning system composition， working principle of the world have some important satellite positioning system， and mainly illustrates a GPS in the car navigation and traffic management and the application of the military applications， as well as in medical applications
