用于太阳矢量确定的太阳电池片在轨性能分析

Analysis of On-Orbit Performance of Solar Cells for Sun Vector Determination

太阳电池片可用作粗太阳敏感器(粗太敏),多个等规格粗太敏相互配合可实现太阳矢量的全天域获取;粗太敏的在轨性能决定了其获得太阳矢量的精度。本文基于TZ-1(天智一号)卫星长时间跨度的大量在轨数据,以差分式太阳敏感器确定的太阳矢量为基准,分析粗太敏所确定太阳矢量的角度偏差;对粗太敏输出进行反演,分析其安装偏差及性能衰减情况;并综合多片粗太敏输出,对三结砷化镓太阳电池片对应的凯利余弦曲线进行拟合。分析结果表明,粗太敏安装偏差较小,其所确定的太阳矢量偏差小于5°,性能衰减速率约为0.0621 V/a,可实现一定精度范围内太阳矢量的全天域获取。

Solar cells can be used as coarse sun sensors,and sun vectors can be determined for the entire sky by combining several coarse sun sensors of the same specification.The accuracy of the sun vector is determined based on the on-orbit performance of the coarse sun sensors.On the basis of a large amount of on-orbit data of TZ-1(TianZhi-1)satellite over an extended period,this study analyzed the angle error between sun vectors determined using coarse sun sensors and differential sun sensor.The output of the coarse sensors was inverted,and the installation angle error and performance attenuation of the coarse sensors were analyzed.The Kelly cosine curve corresponding to the triple junction GaAs solar cell was fitted by combining the output of the multiple coarse sensors.The analysis results show that the installation error of the coarse sensor is slight,the obtained sun vector error is smaller than 5°,and the performance attenuation rate is approximately 0.0621 V/a.The proposed sensor can achieve the all-sky acquisition of the sun vector within a specific accuracy range.