灵敏小卫星能量/姿态一体化控制研究

研究应用变速控制力矩陀螺群(VSCMGs, Variable Speed Control Moment Gyros)作为主执行机构,完成灵敏小卫星多目标快速姿态机动时的能量/姿态一体化控制问题.在考虑执行机构饱和、机动任务要求和敏感器测量与跟踪能力受限等情况下,设计了非线性的姿态/能量一体化控制器,对由于频繁的姿态机动引起的姿态四元数的漂移进行了整定.设计了VSCMGs的操纵律.按是否接近框架构型奇异,合理分配了操纵任务,并设计了相应的操纵方法.对采用金字塔构型的VSCMGs进行了较为严格的仿真,结果表明卫星在机动中达到了快速和稳定的要求,同时能够满足能量控制要求和VSCMGs转子转速的平衡.

Integrated power and attitude control system based on VSCMGs for agile small satellite

The multi-projects attitude maneuver problem for ASSAT(agile small satellite) w ith VSCMGs(variable speed control moment gyros) as actuator was in vestigated. Under some limits, such as, the saturation of actuators, the require ment of attitude maneuver, the measurement and tracking ability of sensors, a no nlinearly integrating power and attitude controller was designed. The quaternion drift resulting from frequent maneuver was tuned. A VSCMGs steering law was pro vided. According to the singularity indicator of configuration, the steering tas ks including singularity avoidance and wheel speed equalization were assigned so undly. Two corresponding methods were designed. The law was switched form one me thod to another if the indicator reached the defined condition. A numerical exam ple for the IPACS(integrated power and attitude control system) with VSCMGs of p yramid configuration was given. The simulating results show that the ASSAT is ab le to satisfy simultaneously the requirements of the rapid speed attitude maneuv er and stability, as well as the energy control and wheel speed equalization.