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太阳电池阵作为长寿命小卫星的主能源,负责光电能量转换,其在轨输出电流受诸多外部因素和内部因素的影响,其中最重要的是有效太阳光强的影响和空间环境导致自身性能衰降的影响。因此太阳电池阵在轨输出电流呈现长期缓慢衰降的趋势,尤其在寿命中后期及超期服役阶段,输出电流可能还会受到一些如轨道漂移等不可预计因素的影响而发生变化。掌握太阳电池阵在轨输出电流的变化规律,对于是否需要采取能源参数的调整、改变载荷的使用策略或变轨等确保整星能源安全的在轨管理措施具有重要意义。以在轨卫星的实测数据为基础,对已知的外部影响因素进行归一化处理,分析其规律性,采用数学函数的方式对归一化后的在轨数据进行拟合,得到太阳阵在轨输出电流的预计模型,并将采用此模型的预计值与实测值进行比较,验证了模型精度。
As the main energy source for long-life small satellites, the solar array is responsible for the conversion of photovoltaic energy. The in-orbit output current is affected by many external factors and internal factors. The most important of these is the influence of effective sunlight intensity and the space environment leading to its own performance degradation Drop impact. Therefore, solar cell array output current in the rail showed a long-term decline in the trend of slow decline, especially in the late life and extended service phase, the output current may be subject to some factors such as track drift and other changes. Grasping the regularity of solar cell array on-orbit output current is of great significance to the on-orbit management measures such as the need to adjust the energy parameters, change the load strategy or change the orbit to ensure the energy security of the entire satellite. On the basis of the measured data of orbiting satellites, the known external influencing factors are normalized, the regularity is analyzed, the normalized orbital data are fitted by means of mathematical functions, and the solar array is obtained Rail output current of the expected model, and the use of this model is compared with the predicted value of the measured value to verify the accuracy of the model.