航天级光电编码器的信号处理系统设计

Design of signal process system for spaceborne photoelectric encoder

为了实现航天级光电编码器的小型化,减小航天设备的体积、重量并满足其冷备份要求,设计了具有双读数系统的航天级光电编码器信号处理系统。首先,介绍了双读数系统航天级光电编码器的精码和粗码信号处理方法以及信号处理系统的小型化和可靠性设计;然后,从光电编码器误差产生的原因及空间分布特征出发,对双读数系统航天级光电编码器进行了精度分析;最后,采用比较法,以23位高精度光电编码器作为角度基准,对该光电编码器进行了精度检测。实验结果表明:应用该信号处理系统的双读数系统光电编码器的分辨力为20″,精度σ≤30″。该系统已在工程项目中得到应用,实践表明系统的设计满足航天设备的技术要求。

In order to realize the miniaturization of spaceborne photoelectric encoders,minish the sizes and weights of the spaceflight equipment effectively and to satisfy the requirement of the cold copy of photoelectric converting circuits,a signal process system is designed for the spaceborne photoelectric encoder with dual-reading system.Firstly,the process methods of the coarse and precise code signals are presented for the spaceborne photoelectric encoder with dual-reading system and the miniaturized and reliable design of the signal process system is described.Then,the accuracy of the spaceborne photoelectric encoder with dual-reading system is analyzed based on the error sources and distribution characteristics.Finally,using a 23-bit high precision photoelectric encoder as the angle standard,the accuracy of the designed photoelectric encoder is tested based on a comparison method.The experiment results show that the resolution and the accuracy of the photoelectric encoder with dual-reading system are 20″ and less than 30″,respectively.By applying to practical projects,the process system has satisfied the technique requirement of the spaceborne equipment.