基于扩张状态观测器的卫星通信跟踪控制系统设计

Design of Satellite Communication Tracking Control System Based on Extended State Observer

摘要:

当前卫星通信跟踪控制系统对精准度的控制仅能维持在微弧度量级,跟踪控制精度难以达到用户要求,为了解决上述问题,基于扩张状态观测器设计一种新的卫星通信跟踪控制系统。系统硬件主要设计了控制模块、传感器模块、电源模块与电机驱动模块,控制模块的核心芯片选用SXD320F2784型号,提高处理频率,电源芯片为TDG3320芯片,能够保证固定电压转换为可调电压,传感器模块通过AHRS轴向传感器、GPS、信标机组成,确保传感能力,利用L845N芯片设计电机驱动模块,增强额定电压。引入扩张状态观测器,通过系统初始化、天线经纬度计算、误差比较、卫星通信信号跟踪控制、驱动直流电机实现软件流程。实验结果表明,所设计卫星通信跟踪控制系统能够将跟踪精度从原来的微弧度量级提高到纳弧度量级,有效提升跟踪准确率,增强系统的干扰抑制能力,确保控制输入峰值达到与其要求。

Abstract:

The current satellite communication tracking control system can only maintain the accuracy of the micro-arc measurement level, and the tracking control accuracy is difficult to meet user requirements. In order to solve the above problems, a new satellite communication tracking control system is designed based on the expanded state observer. The system hardware mainly designs the control module, sensor module, power module and motor drive module. The core chip of the control module selects the SXD320F2784 model to increase the processing frequency. The power chip is the TDG3320 chip, which can ensure that the fixed voltage is converted into an adjustable voltage, and the sensor module passes The AHRS axial sensor, GPS, and beacon machine are composed to ensure the sensing ability. The motor drive module is designed with the L845N chip to increase the rated voltage. The extended state observer is introduced, and the software process is realized through system initialization, antenna latitude and longitude calculation, error comparison, satellite communication signal tracking control, and driving DC motor. The experimental results show that the designed satellite communication tracking control system can improve the tracking accuracy from the original micro-arc metric level to the nano-arc metric level, effectively improve the tracking accuracy, enhance the interference suppression capability of the system, and ensure that the peak value of the control input meets its requirements.