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Ultrahigh-precision fiber-optic gyroscope quantization error suppression method based on dual-electrode Y waveguide

A fiber optic gyroscope and quantization error technology, which is applied in measurement devices, instruments, etc., can solve the problems of voltage signal interference and noise inundation, and cannot achieve quantization error, etc., to achieve the effect of convenient production and processing, improved short-term accuracy, and low cost

Active Publication Date: 2019-04-30
BEIHANG UNIV
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Problems solved by technology

Therefore, directly adopting the method of increasing the number of bits of DA will make the voltage signal corresponding to the low bit of DA more likely to be overwhelmed by interference and noise in the circuit, and the ideal suppression effect of quantization error cannot be achieved.

Method used

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  • Ultrahigh-precision fiber-optic gyroscope quantization error suppression method based on dual-electrode Y waveguide
  • Ultrahigh-precision fiber-optic gyroscope quantization error suppression method based on dual-electrode Y waveguide
  • Ultrahigh-precision fiber-optic gyroscope quantization error suppression method based on dual-electrode Y waveguide

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[0029] The present invention will be further described in detail below in conjunction with the accompanying drawings and examples.

[0030]The invention is a method for suppressing the quantization error of an ultra-high-precision fiber optic gyroscope based on a double-electrode Y waveguide. see figure 2 and image 3 As shown, the two-electrode Y waveguide used in this method includes two pairs of electrodes, one long and one short. The length of the second pair of electrodes (electrode 2) is about 1 / 8 of the length of the first pair of electrodes (electrode 1), so the second pair of electrodes The 2π voltage (electrode 2) is approximately 8 times the 2π voltage of the first pair of electrodes (electrode 1). Since the 2π voltage of the second pair of electrodes in the two-electrode Y waveguide is about the 2π voltage V of the first pair of electrodes 2π 8 times of (≈8V 2π ), then the same voltage V 2π / 2 N The effective number of bits corresponding to the second pair o...

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Abstract

The invention is an ultrahigh-precision fiber-optic gyroscope quantization error suppression method based on a dual-electrode Y waveguide and belongs to the technical field of a fiber-optic gyroscope.The method adopts the dual-electrode Y waveguide, and a second counter electrode is added on the basis of a conventional Y waveguide; two Das are used to drive the two counter electrodes respectively, and step wave registers of the two Das are combined together to form a higher-order step wave register, which increases the order of the DA for feedback equivalently, thereby improving quantification noise of an ultrahigh-precision fiber-optic gyroscope. The method improves order of the step wave register without greatly reducing voltage corresponding to 1LSB, thereby preventing influence of circuit noise and interference on small voltage (the voltage corresponding to the lowest order of the DA). According to the method, the second counter electrode is increased on the basis of the conventional Y waveguide, so that production and processing is more convenient and cost is lower.

Description

technical field [0001] The invention belongs to the technical field of fiber optic gyroscopes, and relates to an ultra-high-precision fiber optic gyroscope quantization error suppression method based on a double-electrode Y waveguide. Background technique [0002] Gyroscope is the core component of inertial system and one of the key contents of inertial technology research. The fiber optic gyroscope is a kind of optical fiber sensor sensitive to angular rate. It is actually a ring interferometer based on the Sagnac effect. It calculates the angular rate of the closed optical path by detecting the phase difference between two counterpropagating beams. Because it has the advantages of all solid state, low cost, high reliability and fast start-up speed, it is widely used in the fields of aircraft, submarines, warships, missiles, satellites, etc., and has become a research hotspot of inertial devices at home and abroad in recent years. [0003] In the development process and pr...

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Application Information

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IPC IPC(8): G01C25/00
CPCG01C25/005
Inventor 张春熹陈和宇郑月王夏霄孔令海
Owner BEIHANG UNIV
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