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Fiber gyroscope feedback loop nonlinearity test method

A non-linearity, fiber-optic gyroscope technology, applied in measurement devices, instruments, etc., can solve problems such as the inability to intuitively and truly reflect the nonlinearity of the feedback loop, and the long test time, and achieve good data real-time performance and acquisition speed. quick effect

Inactive Publication Date: 2019-01-04
HUNAN AEROSPACE ELECTROMECHANICAL EQUIP & SPECIAL MATERIAL INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method takes a long time to test and requires data smoothing. There is a delay between the feedback loop and the test data, and it cannot intuitively and truly reflect the correspondence between the feedback loop and its nonlinearity.

Method used

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  • Fiber gyroscope feedback loop nonlinearity test method
  • Fiber gyroscope feedback loop nonlinearity test method
  • Fiber gyroscope feedback loop nonlinearity test method

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Experimental program
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Embodiment Construction

[0022] The main realization process of the present invention comprises:

[0023] 1) Add a chipscope soft core to the logic circuit of the fiber optic gyroscope, and add the driving data of the feedback loop and the test data of the forward loop as the data to be analyzed;

[0024] 2) Set the working mode of the logic circuit in the fiber optic gyroscope to the combination output mode of ladder wave + square wave modulation, and the ladder height is 1;

[0025] 3) Open the chipscope data analysis tool, set the working mode to continuous collection and automatic data storage, and start data collection;

[0026] 4) After completing a period of data collection, open Matlab to process and plot the data to obtain the nonlinearity curve of the feedback loop.

[0027] Design a stepped sawtooth wave in the FPGA program of the gyro, and output it to the Y waveguide through the DA circuit; the step height of the stepped sawtooth wave is 1, the amplitude range is 0~65535, and the step wi...

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Abstract

The invention discloses a fiber gyroscope feedback loop nonlinearity test method. Data acquisition is performed by a chipscope of an FPGA (Field Programmable Gate Array) instead of an external acquisition system, and the chipscope has good data instantaneity and high acquisition speed; test data have no delay without data smoothing; input data of a circuit are completely in one-to-one correspondence to nonlinearity output data.

Description

technical field [0001] The invention relates to the testing field of an optical fiber gyroscope, in particular to a method for testing the nonlinearity of an optical fiber gyroscope feedback loop. Background technique [0002] Fiber optic gyroscope is an angular velocity sensor based on the Sagnac effect. It is an all-solid-state inertial instrument with broad application prospects. It is different from traditional mechanical gyroscopes. It has got rid of the category of rotor gyroscopes. It has long life, light weight, small size, low power consumption, large measurement range, and quick start. , flexible structure design and so on. Due to its potential accuracy, fiber optic gyroscopes have replaced most of the traditional electromechanical gyroscopes in sea, land, air, and space applications, and have played a key role. [0003] The nonlinearity of the feedback loop of the fiber optic gyroscope directly affects the final scale factor nonlinearity index. Therefore, it is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01C25/00
CPCG01C25/005
Inventor 刘智荣
Owner HUNAN AEROSPACE ELECTROMECHANICAL EQUIP & SPECIAL MATERIAL INST