光纤陀螺惯性测量组合的数字温控系统设计

Digital temperature control system design for FOG inertial measurement unit

光纤陀螺惯性测量组合的测量精度会受到环境温度变化的影响。采用温度控制手段能够有效解决这一问题。提出了一种基于分级控制、分段控制和闭环控制思想的温控方案,并在此基础上设计了一种DSP+FPGA架构的数字温度控制电路,实现了温控电路的整体结构和工作流程,说明了以Fuzzy PID算法为核心的温度控制算法原理。试验结果表明,系统具有速度快、精度高等优点,为解决惯性测量组合启动后缩短惯性器件热平衡过程,迅速进入稳定工作状态提供了一种实用方法,也为类似的惯性测量组合温度控制系统提供了有益参考。

The measuring accuracy of FOG Inertial Measuring Unit（IMU） would be influenced by the environment temperature change, and this problem can be solved by means of controlling temperature. A temperature control scheme was proposed which was based on the concepts of hierarchical control, sectional control and closed-loop control. From this, a digital temperature control system with＂ DSP ＋ FPGA＂ architecture was designed from several aspects, such as temperature control scheme, temperature control circuit and temperature control arithmetic. The experiments show that the temperature control system enhanced the environment adaptability, and the system possesses the advantages of fast learning speed, high precision, etc. It provides a practical method for shortening the thermal balance of inertial device after IMU start-up and rapid getting to steady working state.