基于太阳电池板的皮卫星太阳矢量测量算法研究

以低轨道皮卫星为应用对象,设计了一种基于太阳电池板的太阳矢量测量敏感器。敏感器完全复用卫星体装供电的太阳电池板进行矢量测量。通过对太阳电池板Ⅰ-Ⅴ输出模型的分析,提出了一种计算电池片工作点变化、补偿温度影响的太阳矢量测量算法。算法以卫星各个表面太阳电池片的电流、电压、温度为输入,测量范围为整个空间。经过实验和仿真以及对非理想余弦特性、测量噪声和地球反照光影响的分析,敏感器单独工作时,一般情况下测量精度优于9.2°,任意情况下优于12.7°。

SUN VECTOR DETERMINATION OF PICO-SATELLITE USING SOLAR PANELS DATA

A design for pico-satellite sun sensor in low earth orbit using solar panels data was developed. In the design, the solar panels necessary for power generation are also used as a sensor for sun vector determination. Analyzing the mod-el of solar cells Ⅰ-Ⅴ characteristics, an algorithm for the calculation of solar cell operating point and compensation of solar cell operating temperature was developed. The algorithm employs voltage, current and temperature measurements from all of the solar panels to reconstruct the sun direction, and visual field of the whole space. According to the analysis of non-ideal cosine curve between incident angle and photocurrent, the measurement noise, and the reflected solar radiation from Earth. The results shown that the test error of sun vector is lower than 9.2° in most conditions, and 12.7° in any condi-tion.