Affects of temperature and error compensation for fiber optic gyro
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摘要: 温度性能是光纤陀螺工程化面临的难题之一,建立温度模型是提高光纤陀螺温度性能的有效方法.从理论上推导了光纤陀螺零偏、标度因数温度误差是由于热作用于光纤环导致光路非互易性所引起.分析了光纤陀螺热源产生的两个主要原因:光纤陀螺内部有源器件工作过程中产生的热;外界环境温度变化引起光纤环内部温度场分布变化.二者对光纤陀螺的影响是随机的,引起的光纤陀螺零偏漂移和标度因数误差可以通过建立温度模型进行补偿.采用线性回归方法,建立了光纤陀螺零偏温度漂移模型和标度因数温度模型,对光纤陀螺输出数据进行补偿,有效改善了光纤陀螺温度性能,实验验证了模型的正确型和补偿算法的有效性.Abstract: The thermal characteristic of fiber optic gyro(FOG) is one of difficult questions, it is a efficient method to improve the thermal characteristic of FOG by modeling. The characteristic of thermal affect induced nonreciprocity of optic loop was introduced , and it is one of the main reasons that affect the steability of Bias and scale factor of FOG. The thermal affect produced by the inner instruments of FOG is the main reason of warm-up time. And the warm-up time can be shortened by modeling and compensating. The influence of surrounding temperature for FOG is random. The error can be modeled and compensated by temperature model. The error model of temperature drift and scale factor of FOG is settled. The raw data of FOG is compensated with the model and the validity of the model is tested.
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Key words:
- fiber optic gyro /
- line regression /
- temperature modeling
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