Method for testing frequency characteristic of front plate of fiber-optic gyroscope

Abstract

The invention discloses a method for testing the frequency characteristic of a front plate of a fiber-optic gyroscope. The method includes the steps that a frequency control word corresponding to each testing frequency point is preset, cosine sweep check digital signals and reference digital signals are acquired by using a direct digital frequency synthetic method, wherein the reference digital signals are formed by conducting 90-degree phase shifting on the cosine sweep check digital signals, the cosine sweep check digital signals are converted into cosine sweep check analog signals and then input to the front plate of the fiber-optic gyroscope, analog digital conversion is conducted on output signals of the front plate of the fiber-optic gyroscope, and then the sample sequence of the output signals of the front plate of the fiber-optic gyroscope is acquired; two paths of correlation coefficients are acquired through correlation operations; all the testing frequency points are repeated to acquire the sequence of the two paths of correlation coefficients, and then the sequence is sent to an upper computer; parameters of the amplitude-frequency characteristic, parameters of the phase-frequency characteristic and parameters of the frequency characteristic of the front plate of the fiber-optic gyroscope are calculated and acquired. According to the method, the frequency characteristic of the front plate of the fiber-optic gyroscope can be rapidly and accurately measured, and the device utilizing the method has the advantages of being simple in structure, low in cost, high in measuring speed, large in measuring frequency range, and high in accuracy.

Description

technical field [0001] The invention relates to a method for testing frequency characteristics, in particular to a method for testing the frequency characteristics of an optical fiber gyroscope front board. Background technique [0002] Fiber optic gyroscope is a kind of fiber optic sensor sensitive to angular rate. The fiber optic gyro has the advantages of small size, light weight, wide range of accuracy, and no moving parts. It is a new type of all-solid-state inertial instrument. Due to the importance of the fiber optic gyroscope in the application fields of aviation, aerospace, navigation and weapons, it has received close attention from research institutions around the world from the very beginning, and has developed rapidly, becoming one of the mainstream instruments in the field of inertial measurement and guidance. [0003] The fiber optic gyroscope has two working modes, which are open-loop operation mode and closed-loop operation mode. The fiber optic gyroscope ...

AI Technical Summary

Problems solved by technology

Therefore, how to quickly and accurately test the frequency characteristics of the fiber optic gyroscope preamplifier is a very important issue. The current frequency characteristic testing instruments have high cost, redundant functions, slow measurement speed, non-specialized instruments, complicated operation, and cannot test high The frequency characteristics under the high frequency can not be tested at any frequency point, which cannot meet the requirements of fast and accurate measurement of the frequency characteristics of the fiber optic gyro front board

Images