太阳敏感器输出误差测量装置研究

Measuring Device for Output Error of the Solar Sensor

设计完成了一种太阳敏感器输出误差测量装置,其原理简单、成本较低,可以满足大部分太阳敏感器地面测试测量精度的需求。太阳敏感器是卫星动态模拟器敏感器部件的重要组件之一。太阳敏感器输出误差测量是卫星动态模拟器研制和实验操作的一项重要的前期工作,精确测量太阳敏感器误差对以后的理论计算和仿真实验有重要意义。太阳敏感器主要通过测量太阳光线与卫星某一体轴之间的夹角,确定太阳在敏感器本体坐标系中的位置,通过坐标矩阵变换得到太阳在卫星本体坐标系中的位置,最终在卫星的姿态控制系统中求出卫星姿态,即卫星的空间方位。提出了一种新的基于ARM7单片机的数字太阳敏感期输出误差测量装置设计方法。采用高精度数字式二自由度电动转台作为测量装置的基台,用于改变输入角度。采用ARM单片机控制器控制转台的转动角度和转动速度;采用专用的太阳模拟器作为太阳敏感器的输入光源;太阳敏感器的输出角度通过无线模块传送至PC机进行输出处理操作。对比转台角度和太阳敏感器的输出实测角度,可以得到太阳敏感器的输出误差曲线。本测试系统误差来源较少,主要为动力学转台的运动误差和太阳模拟器光源误差。转台的运动控制精度为0.00125mm/(°)。理想情形本装置的测量精度为角秒级。

The device for measuring output error is simple in principle and with a low cost. It can meet most requirements of the measurement accuracy for the solar sensor. Its development is a sub-project of the project of the satellite dynamic simulator, as one of the important problems before the study and test of the satellite dynamic simulator, to measure the output error of the solar sensor. A design of the device is presented in this paper. It is based on the powerful ARM7 microchip controller. The high precision digital two-axis electric rotating platform is used to change the input angle. The ARM microchip controller is used to control the rotating angle and the rotating speed. A specific solar simulator is used as the light source of the solar sensor. The output angle of the solar sensor is transferred to the PC by the wireless URAT communication module. The error curve is obtained while comparing the changed angle of the rotating platform with the output angle from the solar sensor. The sources of the error of the device are reduced greatly. The main error sources are from the rotating platform and the solar simulator. The accuracy of the rotating platform reaches 0.001 25 mm per degree. The accuracy of the device can be in arcsec level if the surrounding is at a perfect state.