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Optical carrier microwave gyroscopic method for detecting angular velocity

A light-borne microwave gyro and angle detection technology, which is applied to Sagnac effect gyroscopes, gyroscopes/steering sensing equipment, measuring devices, etc., can solve the problem of low measurement accuracy, high system maintenance costs, and difficult To achieve practicality and other issues, to achieve the effects of easy implementation, elimination of temperature drift, and high frequency stability

Active Publication Date: 2013-09-04
ZHEJIANG UNIV
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Problems solved by technology

The laser gyroscope is the earliest and most mature optical gyroscope, and it is also the optical gyroscope with the highest precision at present. However, the disadvantage of this method of detecting angular velocity is that there is a locking effect, the system maintenance cost is high, and the production is difficult.
The method of resonant fiber optic gyroscope to detect angular velocity has the advantages of short fiber length and easy miniaturization, but it has high requirements on the light source and requires a strong coherent light source with narrow bandwidth. The current resonant fiber optic gyroscope has low measurement accuracy. Difficult to achieve practicality

Method used

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  • Optical carrier microwave gyroscopic method for detecting angular velocity
  • Optical carrier microwave gyroscopic method for detecting angular velocity
  • Optical carrier microwave gyroscopic method for detecting angular velocity

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Embodiment Construction

[0016] The measurement principle of the present invention is briefly described as follows:

[0017] In the present invention, lasers, electro-optical modulators, optical couplers, optical fiber ring cavities, photoelectric detectors, electric filters, electric amplifiers, etc. are used to form two bidirectional positive feedback loops, and stable and clean spectrum are obtained by modulation and filter frequency selection. Bi-directional RF / microwave signal for sensing rotational angular velocity. At the same time, the phase-locked loop technology is adopted to control the resonance frequency through feedback adjustment, and the radio frequency / microwave signal of the loop oscillation in one direction is locked to the high-precision standard time reference source.

[0018] The invention is based on the photoelectric oscillation technology and belongs to the two-way photoelectric oscillation method. The interval between the start-up mode of the oscillation loop of the photoele...

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Abstract

The invention discloses an optical carrier microwave gyroscopic method for detecting angular velocity, which is used for measuring the rotational angular velocity through the forward and backward bidirectional high-stability microwave generated in the optical fiber ring by a bidirectional photoelectric oscillator based on the phase-locked frequency doubling technology. The core of the method is the application of the frequency doubling technology, the microwave oscillation frequency in one direction is locked to the high-stability standard time reference source, the relative cavity length of the photoelectric oscillator in the other direction is stabilized, temperature drift and optical parasitic noise of the fiber ring-shaped cavity are eliminated, and the signal-to-noise ratio of the bidirectional oscillation difference frequency signal caused by the Sagnac effect is improved greatly. The optical carrier microwave gyroscopic method for detecting angular velocity, provided by the invention, has the characteristics of being high in measurement precision and easy to realize, and so on.

Description

technical field [0001] The invention belongs to the technical field of high-precision gyroscopes, and in particular relates to an optical-borne microwave gyroscope method for detecting angular velocity. Background technique [0002] In the field of inertial navigation, gyroscopes are usually used to detect the rotational angular velocity of the carrier. Gyroscopes are widely used in the guidance and control of space vehicles, aircraft, missiles, submarines, ships, etc., and play an important role in precision measurement in military, industrial, and scientific fields. There are three main types of common high-precision gyroscopes: mechanical gyroscopes, laser gyroscopes, and fiber optic gyroscopes. Both laser gyroscopes and fiber optic gyroscopes are optical gyroscopes. Although they are not as stable as mechanical gyroscopes, they have the characteristics of compact structure and high sensitivity. They currently occupy most of the market share of high-precision gyroscopes....

Claims

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Application Information

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IPC IPC(8): G01C19/64
CPCG01C19/721
Inventor 宋开臣于晋龙叶凌云
Owner ZHEJIANG UNIV
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