The invention provides a method for automatically unloading angular momentum of a momentum wheel based on solar light pressure. The method comprises the following steps: establishing a light pressure moment model of a detector adopting double-shaft SADA; determining an initial balance angle of the solar wing by using a light pressure moment model of the detector according to the solar incident angle constraint and the rotation angle range constraint of the double-shaft SADA; after the solar wing is controlled to be at the initial balance angle, whether the sun direction vector change of the current moment and the last moment when the solar wing is at the initial balance angle exceeds a set threshold value or not is judged every set time, if yes, the initial balance angle of the solar wing is determined again according to the sun direction vector at the current moment, and the angular momentum of a momentum wheel is obtained; if not, acquiring the angular momentum of the momentum wheel; according to an angular momentum component partition threshold value, determining partitions where the angular momentum components on the three axes are located, and according to a partition result, determining a target light pressure moment on the corresponding axis; and according to the target light pressure moment on the three axes, a gradient descent method is adopted to determine the SADA target rotation angle. Fuel consumed by jet unloading of angular momentum of the momentum wheel can be avoided through light pressure unloading, the method plays an important role in prolonging the service life of the satellite, and the method can be applied to long-time sun cruise of a detector adopting double-shaft SADA in deep space exploration and can also be applied to sun attitude control of near-earth orbit satellites.
本发明提供了一种基于太阳光压的自主卸载动量轮角动量的方法,包括:建立采用双轴SADA的探测器的光压力矩模型;根据太阳入射角约束以及双轴SADA的转角范围约束,并利用探测器的光压力矩模型,确定太阳翼初始平衡角;在控制太阳翼处于初始平衡角后,每隔设定时间判断当前时刻与上次太阳翼处于初始平衡角时刻的太阳方向矢量变化是否超过设定阈值,若超过设定阈值,则根据当前时刻太阳方向矢量重新确定太阳翼初始平衡角,并获取动量轮角动量;若未超过设定阈值,则获取动量轮角动量;根据角动量分量分区阈值,确定三轴上的角动量分量所处分区,并根据分区结果确定相应轴上的目标光压力矩;根据三轴上的目标光压力矩,采用梯度下降法确定SADA目标转角。本发明通过光压卸载可避免动量轮角动量的喷气卸载所消耗的燃料,对提高卫星寿命具有重要作用,可应用于深空探测中采用双轴SADA的探测器长时间对日巡航,也可以应用到近地轨道卫星的对日姿态控制。
Method for automatically unloading angular momentum of momentum wheel based on sunlight pressure
一种基于太阳光压的自主卸载动量轮角动量的方法
2024-06-21
Patent
Electronic Resource
Chinese
IPC: | B64G Raumfahrt , COSMONAUTICS |
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