摘要
针对敏捷卫星在三轴姿态机动过程中"动中拍"的成像任务,分析了推扫条带与星下点轨迹成90°夹角的宽幅动态成像模式,提出了这种成像模式下的姿态调整技术。数值仿真分析了该成像模式对姿态控制精度的要求,并通过卫星工具包(STK)仿真验证了数学模型的正确性。数值仿真结果表明:在10Hz的控制周期下,姿态角的控制精度需求是0.01°,角加速度的控制精度为0.003 0～0.000 1(°)/s2。针对上述指标要求,提出采用小角度内分段匀角速度进行控制的宽幅动态成像姿态调整方法。
The agile satellite with the dynamic imaging technology can realize image acquisitions when the satellite is in the three-axis attitude maneuver process. In this paper, the wide regional dynamic imaging mode is analyzed when the angle between the satellite ground track and the push-broom strip is 90°,and the attitude guidance technology is discussed for the cross-track ac- quisitions imaging mode of the dynamic imaging missions. The attitude control accuracy for that imaging mode is analyzed by the numerical simulation,and the mathematical model is validated by the simulation of STK. Numerical simulation results show that the attitude angle control precision must reach 0.01°, the attitude angular acceleration control precision must be 0. 003 0-0. 000 1 （°）/s2. According to the above requirements, it is considered that the attitude angle should be controlled by the uniform angular velocity in sections at small angle.
出处
《航天器工程》
2013年第4期17-22,共6页
Spacecraft Engineering
关键词
敏捷卫星
动态成像
宽幅成像
姿态控制
agile satellite
dynamic imaging
wide regional imaging
attitude control
