旋转平台绝对运动信息测量系统

Measuring system for absolute motion information of rotary platform

针对当前旋转平台输出的运动信息没有时间刻度问题,设计一种带有GPS时间的运动信息测量系统。采用单片机STM32F103ZET6作为测量系统的主控单元,一方面通过串口采集GPS接收机模块提供的时间信息,另一方面运用单片机采集旋转平台上增量式光电编码器输出的脉冲信息,并实现两类信息的融合、存储;最后对系统测量精度从时间信息与运动信息两方面进行分析、优化与测试验证。测试表明:系统采用8 MHz无源晶振时,时间信息测量误差在±20μs以内;转台转速为1 r/s,半径为1 m,编码器光栅线数为10 000线时,该系统为转台提供的位移精度优于0.1 mm,满足测试应用需求。

To solve the problem that rotary platform whose output motion information lacks time scale, this paper presented a system for measuring the motion information with the GPS time which adopts STM32F103ZET6 singlechip as a main control unit of the measuring system to collect time information from the GPS receiver module by serial port and acquires pulse information output from the incremental photoelectric encoder on the rotary platform. Both types of information could be integrated and stored. Finally, the system measuring accuracy was analyzed, optimized and tested from the aspects of time information and motion information. The results show that the time measurement error is within ±20μs when the system uses 8 MHz passive crystal oscillator; the displacement measurement error is lower than 0.1 mm when speed of the rotary platform is 1 r/s with radius of 1 m, and the encoder grating lines are 10000 lines, meeting the test requirements.