摘要
鉴于磁力矩器与磁强计同时工作会对磁强计地磁测量精度产生很大影响,本文提出一个磁强计与磁力矩器分时工作的方案,然后比较了卫星姿控系统采用不分时/分时两种方案的差异,最后研究了不同分时比例对卫星姿态控制的影响。通过仿真发现:当姿控系统采用分时方案时,电能消耗较少,早期阶段的控制精度较高,而后期稳态阶段的控制精度则相对较低;随着磁力矩器占用时间比例的下降,卫星姿态控制精度呈抛物线下降,卫星进入稳态控制阶段的时间也大大延长;分时比例存在一个相当大的范围,当在此范围内变化时,卫星姿态控制精度较高且变化幅值不大。此外,研究结果也反映出PD控制律良好的控制能力和鲁棒性。
The magnetorquer used on active magnetic control small satellite would strongly disturb the geomagnetic field measurement of the magnetometer when tbey both were working. This paper proposed a simple time-sharing control scheme where the magnetometer and the magnetorquer worked in turn according to a certain time-sharing ratio. In this paper the performance of the attitude control system using the new timesharing scheme is compared with that of the attitude control system using the non-time-sharing scheme. A study on how the time-sharing ratio influences the three-axis attitude control accuracy of the satellite is done. As shown in the simulations, the time-sharing scheme consumes much less power and achieves much higher accuracy of attitude control during the early phase than the non-time-sharing scheme, whereas the latter can achieve relatively lower steady-state control accuracy during the later phase. Furthermore, as the time ratio shared by the magnetorquer decreases, the attitude control accuracy takes on a parabolic decreasing trend and the satellite needs a much longer time to get into stabilization. There exists a considerable range for the time-sharing ratio, in which the attitude control accuracy of the satellite that is obtained in the case of different ratio does not change dramatically. In addition, the results also show the distinct controllability and robustness of the PD control law.
出处
《航天控制》
CSCD
北大核心
2005年第5期37-41,共5页
Aerospace Control
关键词
磁强计
磁力矩器
分时
姿态控制
近地小卫星
Magnetometer Magnetorquer Time-sharing Attitude control Near-Earth small satellite
