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为提高大型可展开天线的指向控制精度,并适应喷气卸载等在轨工况,基于Craig-Bampton法建立了表征柔性天线指向的动力学模型,在此基础上提出了一种采用信标的大天线指向控制方法。该方法先基于卡尔曼滤波,对大天线的振动状态进行检测,若天线未出现明显振动,则通过信标敏感器修正天线指向偏差,同时引入星本体姿态敏感器以保证稳定性;若天线振动超过阈值,则仅引入星本体敏感器以衰减振动,直至天线未出现明显振动。最后利用瑟拉亚(Thuraya)卫星的在轨实测热变形数据进行了仿真验证。结果表明,在未受到喷气扰动时,大天线指向精度优于±0.02°,在受到喷气扰动后,系统可正确检测并切换跟踪输入。这说明,该指向控制方法在保证稳定性的同时,可以有效修正大天线指向偏差,并能适应在轨位保、卸载喷气工况。
In order to improve the pointing control accuracy of large deployable antennas and adapt to off-track conditions such as jet unloading, a dynamic model of flexible antenna pointing is established based on the Craig-Bampton method. Based on this, a large antenna with beacons Point to the control method. The method first detects the vibration state of a large antenna based on Kalman filter. If the antenna does not appear obvious vibration, the antenna pointing deviation is corrected by a beacon sensor, and a star body attitude sensor is introduced to ensure the stability. If the antenna vibration When the threshold is exceeded, only the ontology sensor is introduced to dampen the vibration until no significant vibration of the antenna occurs. Finally, the in-orbit measured thermal deformation data of Thuraya satellite were simulated. The results show that the pointing accuracy of the large antenna is better than ± 0.02 ° without jet disturbance, and the system can detect and switch the tracking input correctly after the jet disturbance. This shows that the pointing control method can not only ensure the stability, but also effectively correct the pointing deviation of the large antenna, and can adapt to the on-orbit protection and unloading of the jet condition.