The satss is an antenna pointing servo system with ultra - low speed and high accuracy , driven by a rare earth permanent magnet ( repm ) brushless dc torque motor . to reduce torque ripple , the repm brushless dc torque motor has a slotless armature , and uses sinusoidal wave driven technology 卫星天线跟踪伺服系统为超低速高精度天线指向控制系统，该系统使用稀土永磁式无刷直流力矩电机作为天线的驱动机构，为降低转矩脉动，电机采用无槽电枢结构设计，并使用正弦波驱动方式。
In this thesis , the author presents a new method for developing microcontroller software : doing system analysis and design using the object - oriented method , and designing the software structure using the message - driven mechanism . taking a satellite antenna tracking and servo system ( satss ) for example , the thesis gives step - by - step approach of the new software developing method 在系统控制软件设计中，提出了将面向对象的方法和消息驱动机制应用于单片机系统软件的设计与开发当中的思想，并将其应用于卫星天线跟踪伺服系统的研制工作中，结合工程实践给出了具体的系统分析设计方法与步骤。
