Method for improving open cycle digital optical fiber gyroscope scale factor linearity

Abstract

The invention discloses a method for improving linearity of scale factors of a digital open loop optical fiber gyroscope, which comprises the following steps of: constructing a test system for analog value input-digital code output of an analog-to-digital converter; obtaining a check list output in digital coded responding to different analog value inputs of the analog-to-digital converter from 0 to Vpp; calculating to obtain a nonlinear integral error check list of digital code steps corresponding to different analog value inputs of the analog-to-digital converter; and compensating the nonlinear integral error of the analog-to-digital converter by addition of a subtracter, and obtaining accurate outputs of the analog-to-digital converter. The invention effectively reduces pseudo output arising from the nonlinear integral error of the analog-to-digital converter, so as to ensure the accuracy of the output signal of the digital open loop optical fiber gyroscope; and can compensate the nonlinear integral error according to different parameters of the analog-to-digital converter, so as to effectively improve the linearity of the scale factor of the digital open loop optical fiber gyroscope.

Description

Technical field [0001] The invention relates to the field of optical fiber sensors in optoelectronic technology, and in particular to a method for improving the linearity of the scale factor of an open-loop digital optical fiber gyroscope. More specifically, it refers to a method that uses a subtractor to compensate the integral nonlinearity error of the analog-to-digital converter to improve the linearity of the scale factor of the open-loop digital fiber optic gyroscope. Background technique [0002] The open-loop digital fiber optic gyroscope system has a simple structure and low cost, but the linearity of the scale factor is not ideal, which directly restricts its application. In principle, the scaling factor of an open-loop digital fiber optic gyroscope is a function of the diameter and length of the fiber optic ring, the gain of the PIN detector, preamplifier, and analog-to-digital converter (ADC). Their changes will directly affect the scaling factor. Make an impact. [00...

AI Technical Summary

Problems solved by technology

In this way, the subtraction of the two will bring a greater error to the scale factor of the open-loop fiber optic gyroscope

At the same time, the integral nonlinear error corresponding to different digital codes is different, which directly leads to the deterioration of the linearity of the open-loop digital fiber optic gyroscope scale factor

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