Method for enhancing optical fibre gyroscope output accuracy

Abstract

The invention discloses a method for increasing the fiber optic gyro scope output precision. The method comprises the steps of: constructing a testing system which inputs digital codes and outputs simulated values of the analog-digital converter; obtaining a comparison table which is output through inputting responded simulated values of different digital codes from 0 to 2N-1 of the analog-digital converter; calculating to obtain an integration non-linear error comparison table corresponding to different digital code input of the analog-digital converter; compensating integration non-linear errors of the analog-digital converter through a hardware compensating method of adding a subtracter; and obtaining accurate analog-digital converter output. The method effectively lowers false output which is caused by the integration non-linear errors of the analog-digital converter, guarantees the accuracy of fiber optic gyro scope feedback and offset voltage, can regulate compensated integration non-linear error parts according to parameter differences of the analog-digital converter, and effectively improves the output precision of the fiber optic gyro scope.

Description

technical field [0001] The invention relates to the field of optical fiber sensors in optoelectronic technology, in particular to a method for improving the output precision of an optical fiber gyroscope. More specifically, it refers to a method of improving the output accuracy of the fiber optic gyroscope by compensating the integral nonlinear error of the digital-to-analog converter by hardware. Background technique [0002] The modulation of the closed-loop FOG has two main functions: dynamic bias and closed-loop feedback. Among them, the dynamic bias makes the system work at the most sensitive ±π / 2 operating point, and the closed-loop feedback provides an additional phase to compensate for the Sagnac phase shift caused by the system rotation, keeping the fiber optic gyroscope working accurately at ±π / 2 operating point, so as to obtain a scale factor with good linearity. [0003] Current implementations of dynamic biasing and closed-loop feedback are accomplished by app...

AI Technical Summary

Problems solved by technology

[0004] In the signal processing circuit-digital-to-analog converter-post-amplification drive circuit loop, the integral non-linear error of the digital-to-analog converter is the most important source of error, the existence of this error reduces the accuracy of the feedback and bias voltage, resulting in Inaccurate feedback and bias voltage, which reduces the output accuracy of the fiber optic gyroscope

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