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Four-frequency laser gyro zero offset compensation method

A quad-frequency laser gyroscope and compensation method technology, applied in Sagnac effect gyroscope and other directions, can solve the problems of not being able to represent the real temperature, the temperature sensor measuring the temperature delay, and the inability to compensate for zero offset changes, etc.

Inactive Publication Date: 2011-04-06
NAT UNIV OF DEFENSE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is a delay in measuring the temperature with a temperature sensor, which cannot represent the real temperature of the gain medium in the four-frequency laser gyroscope, nor can it compensate for the zero offset change caused by the change in gain.

Method used

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  • Four-frequency laser gyro zero offset compensation method
  • Four-frequency laser gyro zero offset compensation method
  • Four-frequency laser gyro zero offset compensation method

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Embodiment Construction

[0014] The specific implementation will be described in detail below in conjunction with the accompanying drawings.

[0015] figure 1 is the schematic diagram of the mode distribution on the four-frequency laser gyro structure and its gain curve. Inflatable and light ducts are processed on the low-expansion cavity 1, and four reflectors 5, 6, 7, 8 are installed on the four corners of the cavity, of which 7 is an output mirror. Two anodes 2, 3 and one cathode 4 are used to provide gain. 10 is a reciprocal frequency bias element, which provides bias frequency between gyros 1 and 2 of the four-frequency laser gyro to avoid mode competition. 9 is a non-reciprocal frequency bias element, which generates a non-reciprocal frequency bias between two modes of the same polarization of the four-frequency laser gyroscope to avoid locking. There are 4 modes running in the cavity of the four-frequency laser gyro, modes 12 and 13 form gyro 1, and modes 14 and 15 form gyro 2.

[0016] Tem...

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Abstract

The invention discloses a four-frequency laser gyro zero offset compensation method, which uses clockwise or anticlockwise traveling wave beat frequency as a compensation variable instead of a non-temperature sensor. The clockwise or anticlockwise beat frequency signal frequency is measured by a high-frequency photoelectric detector, an amplification circuit, a shaping circuit and an electronic counter, and then zero offset caused by the change of temperature and optical power is compensated according to a built compensation model in a digital signal processing chip. The method has the advantages of ensuring no time delay, really representing dispersion characteristics of a gain medium, and compensating zero offset caused by temperature change and zero offset caused by gain change.

Description

technical field [0001] The invention relates to the zero offset compensation of the four-frequency laser gyroscope, which includes a photoelectric detector, a counter and a mathematical operation unit. Background technique [0002] Laser gyro has the advantages of large dynamic range, no acceleration effect, and simple structure. It is an ideal component for inertial systems, especially strapdown inertial systems, and has been widely used in military and civilian fields. The principle of the laser gyroscope is the Sagnac effect, and at least one pair of counterpropagating light waves run in its optical resonant cavity. When it rotates around the sensitive axis relative to the inertial space, the frequency of the opposite traveling waves splits to form a beat frequency proportional to the rotation rate, so the rotation information of the laser gyroscope relative to the inertial space can be obtained by measuring the beat frequency. [0003] Due to the energy coupling between...

Claims

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Application Information

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IPC IPC(8): G01C19/66
Inventor 龙兴武汪之国王飞
Owner NAT UNIV OF DEFENSE TECH