空间环境高精度光电轴角测量研究

在复杂恶劣的气候条件下进行高精度的轴角测量已经成为发展空间应用技术的主要瓶颈，其中空间温度交变和振动环境，严重制约着空间用轴角测量装置的精度和使用寿命。分析了空间应用环境造成光电轴角测量装置输出误码和器件老化机理，提出一种在空间复杂环境进行高精度轴角测量的系统解决方案。给出了系统硬件设计方法，并采用了一种码盘信号自适应处理技术，弥补了传统的光电轴角测量方法的缺陷，在保证轴角测量高精度的前提下，提高了空间测角平台的可靠性和使用寿命。实验结果表明：测角分辨率为0.618″；测角误差峰-峰值为6.2″。

High-precision optoelectronic axis angle measurement in space

In harsh environment,the precision measurement of the axis angle is critical for the development of space system. The factors such as temperature variations and platform vibration severely limit the accuracy and life time of axis angle measurement device in space. The mechanisms to introduce error code and cause the aging of the device in space were analyzed,and a new solution to realize the high precision measurement of axis angle under the complex space environment was proposed based on such analysis. By using a new adaptive technology of encoder signal processing,the shortcomings of traditional processing method used in measuring the axis angle can be overcome. The experiment results show that the resolution of the angle measurement is 0.618″and the peak-to-peak value of the angle measurement error is 6.2″.