Design Of Portable Antenna Satellite Searching Control System

As satellite communications continue to develop,there is an increasing demand for communications using satellite networks.When faced with natural disasters or emergencies,traditional communication methods are easily damaged and cannot work normally,while the automatic portable station can quickly provide communication support with its advantages of flexibility,quick response,and simple networking.This paper takes the development of "1.2m automatic portable station" as the background,and focuses on the research on the control system of the antenna.By improving the traditional algorithm,it realizes the rapid search for the target orbiting satellite,and ensures that the antenna points to the orbiting satellite with high precision,so as to achieve the effect of more efficient communication with the satellite.The key research contents are as follows:First,an extended automatic satellite alignment algorithm is designed to solve the problem that the antenna needs to point to the target satellite quickly and accurately in the process of finding the satellite.Compared with the conventional automatic star alignment algorithm,on the basis of the conventional hex-shaped full-scan algorithm,this paper improves the extended automatic star alignment algorithm combining the oblique hex-shaped and cross scanning.Through the MATLAB experiment,various algorithms are simulated and compared and quantitatively analyzed.The results show that the extended automatic star alignment algorithm ensures the accuracy of the star alignment,shortens the time required for the star search process,and improves the rapidity of the system.Then,in the process of antenna search,for the stepper motor that drives the azimuth and pitch,because the antenna load is large,the dynamic characteristics of the system are affected under the action of inertia.This paper proposes to apply fuzzy control to the conventional PID controller with fixed parameters.Through the fuzzy controller,new adjustment parameters are continuously generated,so that various technical indicators of PID can be changed in real time,so as to improve the robustness of the system.The simulation experiments show that the fuzzy PID control algorithm has better control effect in response time and error convergence compared with the conventional PID control algorithm.Finally,according to the design requirements of the antenna system,the mechanical structure adopts the azimuth-elevation-polarization three-axis joint driving method.The main control unit selects STM32 chip,selects the sensor,and draws and produces the schematic diagram and PCB.The system software part,through the modular software design method,realizes functions such as one-key pairing of stars,one-key collection,and manual star search.Designed and developed a mobile APP monitoring terminal connected through wireless Wi Fi to realize information display,remote data interaction and other functions.An experimental hardware platform is built to test the function and performance of the control system.The experimental results show that the system meets the design requirements.