Least squares algorithm based calibration method for temperature coefficient of fiber optic gyroscope temperature control device

Abstract

The invention discloses a method for calibrating the temperature coefficient of an optical fiber gyroscope temperature control device based on least squares. Connect 3 groups of fixed resistance resistors to the temperature measurement circuit of the fiber optic gyro temperature control device respectively, and the fixed resistance value is used as the input signal of the temperature measurement circuit of the fiber optic gyro temperature control device to collect virtual temperature data, and remove the virtual temperature whose temperature value is not a constant value Data, use the least squares algorithm to fit the three sets of virtual temperature data respectively, and obtain the temperature coefficient when the fitting error index is satisfied, and finally use the fixed resistance value as the input of the temperature measurement circuit of the fiber optic gyro temperature control device for measurement, and compare with The standard temperature value corresponding to the fixed resistance resistor is compared. If the error is less than 0.03°C, the calibration is completed. Otherwise, the circuit board of the temperature control device needs to be checked and re-calibrated. The invention has the characteristics of simple operation and accurate calibration, thereby improving the temperature measurement accuracy of the optical fiber gyroscope.

Description

technical field [0001] The invention belongs to the field of fiber optic gyroscope temperature control, in particular to a method for calibrating the temperature coefficient of a fiber optic gyroscope temperature control device based on least squares. Background technique [0002] As an ideal device in inertial navigation, fiber optic gyroscope has the advantages of full solid state, high reliability, instant start, no mechanical rotating parts, and simple structure. It has become a new type of gyroscope with strong competitiveness in the field of ship inertial navigation today. However, the temperature factor is an important issue that needs to be solved urgently in the development and engineering process of the fiber optic gyroscope. The performance of the optical device in the fiber optic gyroscope is greatly affected by the temperature factor. Due to the temperature gradient effect in the fiber optic ring, the heat generated will lead to nonreciprocity. Sexual noise seri...

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Problems solved by technology

However, the output voltage of the bridge and the change of the resistance of the platinum resistance are not linear, which makes the temperature m

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