一种关于挠性加速度计温度控制系统设计方法

A Temperature-control System Designing Method for Auartz-flexibility Accelerometer

摘要:

为了提高石英挠性加速度计的零偏稳定性指标,确保惯性导航系统定位定向精度,需要石英挠性加速度计长期工作在稳定的环境温度范围内,相应的温度控制系统设计技术尤为关键；针对某高精度惯性导航系统对温度控制精度指标的实际需求,首先设计了以DSP为核心控制器的温度控制硬件电路；同时以加速度计组件为控制对象,建立温控模型,采用PWM波控制策略及增量式PID控制算法,利用MATLAB仿真工具获得较优的控制参数；在DSP中开发了温度控制程序,并进行参数整定、指标测试,最终使加速度计工作环境温度稳定在55±0.2 ℃范围内；通过实际应用验证表明,该方法针对石英挠性加速度计工程应用特点,实现的温度控制精度高,稳定性好,能够为惯性导航系统的高精度使用奠定基础。

Abstract:

In order to enhance the zero offset stability of auartz-flexibility accelerometer and ensure location accuracy of inertial navigation system, the auartz-flexibility accelerometer needs to work under a stable environment temperature. Thus, the temperature-control system design is fairly significant. Based on the specific requirements of temperature-control accuracy for a high-precision inertial navigation system, a temperature-control circuit was first designed with DSP circuit as the core controller. Then, a temperature-control model, which uses PWM as well as PID method, was built with the accelerometer assembly as the object. By MATLAB simulation and temperature-control algorithm developed in DSP circuit, the optimized parameters of the controller can be obtained. Finally, the working environment temperature of accelerometer can be stabled at 55±0.2 ℃. Experimental results verify that this kind of temperature-control design for auartz-flexibility accelerometer is able to offer high accuracy of temperature-control and fine stability. Thus, it can be applied in high-precision inertial navigation system.