A detection and closed-loop control system and control method of interferometric fiber optic gyroscope loop gain

A technology of fiber optic gyroscope and loop gain, which is applied in general control system, control/adjustment system, surveying and navigation, etc., and can solve gyroscope zero influence, scale factor change, zero bias stability and random walk coefficient degradation, etc. problem, to achieve the effect of keeping the loop gain stable

CN109990773BActive Publication Date: 2020-01-07BEIHANG UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2020-01-07

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Abstract

The invention discloses a detection and closed-loop control system for a loop gain of an interferometric fiber optic gyroscope. By stabilizing a forward channel gain and a feedback channel gain, stability of the integral loop gain is ensured, and the output characteristics of the fiber optic gyroscope are not influenced; and the system particularly comprises a first loop, a second loop and a gainautomatic control loop, wherein the first loop comprises a forward channel, a feedback channel, a step wave generation module, a modulation signal module and a rate demodulation module; the second loop comprises a forward channel, a feedback channel, a 2pi error demodulation module and a 2pi voltage integrator; and the gain automatic control loop comprises a forward channel, a feedback channel, again detection module, a reference gain module, a gain demodulation module, a gain error integrator and a gain error filter.
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Description

technical field

[0001] The invention belongs to the field of fiber optic gyroscopes, in particular to a detection and closed-loop control method for the loop gain of an interference type fiber optic gyroscope. Background technique

[0002] The fiber optic gyroscope is a fiber optic angular velocity sensor based on the Sagnac effect. The interferometric fiber optic gyroscope has the advantages of no rotating parts, wide accuracy coverage, large dynamic range, and high reliability. It has been widely used in aviation, aerospace, navigation, Weapons, energy and other fields. Interferometric fiber optic gyroscope is the core device of fiber optic inertial navigation system, and its performance plays a decisive role in the navigation accuracy of inertial navigation system.

[0003] Fiber optic gyroscope loop gain includes forward channel gain and feedback channel gain. The gain of the forward channel includes the optical power reaching the detector, the gain of the pre-analog a...

Examples

Embodiment Construction

[0048]The following will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only for illustration, and are not intended to limit the present application.

[0049] In order to achieve the gain closed-loop, it is necessary to realize the real-time test of the gain at first. Taking the working state of the four-state modulation as an example, when adding the four-state modulation to the Y waveguide, an additional gain monitoring signal needs to be added. Phase Δφ corresponding to four-state modulation m followed by φ 1 , φ 2 ,-φ 1 ,-φ 2 (When there is no 2π error, φ 1 +φ 2 = 2π, φ 1 2 >π, as φ 1 = 3π / 4, φ 2 =5π / 4), the frequency is the eigenfrequency v of the fiber ring k =1 / (2τ loop ), τ loop is the transit time, which is the time for light to propagate in the fiber ring for one week; th...