光纤捷联惯性测量组合热设计及温度控制技术

Research on Temperature Control and Thermal Design of FOG Inertial Measurement Unit

因光纤惯组的零偏指标主要受工作环境温度梯度变化影响,为降低高精度光纤惯组的零偏漂移,对惯组内部的光纤陀螺及加速度计进行了高精度温度控制,以实现高精度输出。进行了惯组结构的热特性分析及仿真,提出了两级温控加热结合PWM脉宽控制加热片的整体温控方案。用嵌入式数字温控技术实现了惯组内部的9路温度控制。结果表明：惯组在温度-40-50℃范围内,实现了陀螺零偏稳定性优于0.051（°）/h的工程目标。

The measuring accuracy of FOG inertial measurement unit（IMU）would be influenced by the environment temperature change,and this problem could be solved by the method of high precision temperature control.A temperature control scheme was proposed which was based on the concepts of hierarchical control,sectional control and closed-loop control.From this,a nine-channel digital temperature control system with FPGA architecture was designed from several aspects,such as temperature control scheme,temperature control circuit and temperature control arithmetic.The temperature system contained two-level temperature control and PWM temperature control.The experiments showed that the temperature control system enhanced the environment adaptability.Within the temperature from-40℃to 50℃,the output stable was less than 0.051（°）/h.It provided a practical method for shortening the thermal balance of inertial device after IMU start-up and rapid getting to steady working state.