Full digital processing closed-loop fiber optic gyroscope based on fpga

Abstract

FPGA-based full-digital processing closed-loop fiber optic gyro is composed of an optical path part and a circuit part. The optical path part is composed of a broadband light source, a fiber optic coupler, a multifunctional integrated optical chip and a fiber optic coil. The circuit part is composed of an amplification filter circuit, A / D conversion, Composed of FPGA logic circuit, D / A converter, etc., the FPGA logic circuit completes the processing of digital signals, and the sum of the square wave modulation and digital ladder wave feedback signal generated by it is added to the multifunctional integrated optical chip after passing through the D / A converter. On one arm, the fiber coil is a single-mode fiber with lyot depolarizers added at one or both ends. Because the present invention adopts the addition of a lyot depolarizer on the basis of the single-mode fiber coil, the polarization evolution along the single-mode fiber will no longer affect the output of the gyroscope, which improves the zero-bias stability of the fiber-optic gyroscope, and then makes the gyroscope The accuracy is greatly improved; in addition, the modulation and demodulation method of the single-mode fiber coil with depolarizer is the same as that of the polarization-maintaining fiber, but its cost is only one tenth of the price of the polarization-maintaining fiber.

Description

Full-digital processing closed-loop fiber optic gyroscope based on FPGA Technical field [0001] The present invention relates to a fiber optic gyroscope, particularly a FPGA-based full digital processing closed-loop fiber optic gyroscope. Background technique Fiber optic gyroscope, as a kind of novel all-solid-state inertial instrument without moving parts, is usually used for navigation and guidance purpose It provides the attitude and orientation information of the moving carrier through system calculation; as an angular rate sensor, it can also be used to manipulate the vehicle cars, robots, etc. The fiber optic gyroscope can not only accurately measure the angular rate, but also provide the direction data by integrating the angular rate. according to. Optical fiber gyroscopes have been widely used in aviation, aerospace, navigation, weapons and other industrial fields. in fiber optic gyroscope The most widely used is the interferometric fiber optic gyroscope. I...

AI Technical Summary

Problems solved by technology

Optical fiber accounts for a large proportion of the entire cost of gyroscopes, which greatly limits the mass production of medium and high-precision optical fiber gyroscopes.

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