【作者】 孙未；

【导师】 艾勇；

【作者基本信息】 武汉大学 ， 物理电子学， 2004， 硕士

【摘要】 空间激光通信中，PAT(Pointing，Acquisition，and Tracking)系统对实现运动目标之间的通信链路起决定性的作用。现实中PAT系统的庞大体积和较长捕获时间制约着空间激光通信的快速发展。因此，实现PAT系统伺服控制器小型化和对扫描算法的优化具有重要的意义。 本文对现有的空间激光通信PAT系统进行了分析，提出了一种可行的空间激光通信PAT系统地面模型，实现了一种基于TMS320LF2407A DSP的微型PAT伺服控制器。TMS320LF2407A DSP完成定时操作，比较操作，位置、速度控制，PWM输出，磁性编码器输入信号的处理，与信标光的识别、定位系统的通信，与主机的通信，以及I／O端口扫描算法等功能，组成了伺服控制系统的核心单元；功率驱动模块、电动机、复合轴组成伺服控制系统的执行单元；光学系统、信标光的识别和定位系统组成闭环(反馈)控制系统的受控对象和外反馈信号获取单元；磁性编码器及信号处理部分组成闭环(反馈)控制系统的内反馈信号获取单元；论文对该控制系统的构成原理和特性参数进行了详细分析。在控制系统的PWM输出功能中，实现了针对PAT系统需求的单芯片控制双电机的数字PID改进算法，并进行了数字PID控制参数选择的讨论。在I／O端口扫描算法中，讨论了信标光束最佳发散角的选择，给出了望远镜视场角等参数，确定了光栅螺旋扫描和蜂窝螺旋扫描方式的扫描步长，实现了嵌入式光栅螺旋扫描和蜂窝螺旋扫描方式，并对超前瞄准技术以及其超前扫描参数的动态控制进行了研究。对执行部分的误差分析和扫描方式的实验结果验证了该小型化PAT伺服控制器的可行性和实用性。更多还原

【Abstract】 In space laser communication, the system for pointing, acquisition, and tracking (PAT) plays a critical role for establishing the communication access between moving communication terminals. In the traditional PAT system, its large volume and long acquisition time restrict the development of the space laser communication. Thus, it is very valuable to miniaturize the PAT system servo controller and optimize the scanning algorithm.The paper gives a viable space laser communication PAT system ground model and implements a subminiature PAT servo controller based on TMS320LF2407A DSP, based on the analyzing of the existing space laser communication PAT system. TMS320LF2407A DSP makes up of the core of the servo controller. It implements the operation of the timing and the comparing, the controlling of the speed and position, the communication with the identifying and orientation system of beacon, the communication of the host, and the operation of I/O scanning algorithm. The power driving module, the motors, and the complex axes constitute the performing cell. The optical system, and the identifying and orientation system of beacon compose of the controlled object and the outside feedback signal of the closed loop system separately. The magnetic encoder and signal processing part form the inside feedback signal of the closed loop system. The paper analyzes the structure principle and the characteristic parameter of the control system in detail. In the PWM output function of the control system, it implements the improved digital PID algorithm on two motors with only one chip. At the same time, the parameter of the digital PID controller is discussed in the paper. In the I/O scanning algorithm, it discusses the selection of the radiation angle of the beacon, confirms the step of the raster spire scanning and the beehive spire scanning, implements the algorithm of the raster spire scanning and the beehive spire scanning on chip, and studies the point-ahead technology and the dynamic controlling of the point-ahead scanning parameter. The error analysis of the implementing cell and the experiment result of the scanning mode prove that the miniaturized PAT servo controller is feasible and practical.更多还原