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Closed-loop output real-time compensation system and method for magnetic resonance gyroscope

A nuclear magnetic resonance gyro and output compensation technology, which is applied in the direction of measuring devices, instruments, steering sensing equipment, etc., can solve problems such as laser control current offset, slow power drift, and influence on the stability of the nuclear magnetic resonance gyro's zero bias. drifting effect

Active Publication Date: 2020-12-22
BEIJING INST OF AEROSPACE CONTROL DEVICES
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Problems solved by technology

Considering the requirements of miniaturization, the wavelength modulation method is usually used to stabilize the frequency of the pump light, but this method will offset the control current of the laser, so that its power will drift slowly, and finally affect the long-term stability of the NMR gyro. bias stability under

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  • Closed-loop output real-time compensation system and method for magnetic resonance gyroscope
  • Closed-loop output real-time compensation system and method for magnetic resonance gyroscope
  • Closed-loop output real-time compensation system and method for magnetic resonance gyroscope

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Embodiment Construction

[0031] The basic idea of ​​the present invention is: in the nuclear magnetic resonance gyroscope, the pump light is used to polarize the alkali metal atoms, and the polarized alkali metal atoms precess the inert gas atoms through the super-spin exchange to obtain the macroscopic nuclear spin magnetism. The parameters such as its frequency and power will have an important impact on the precession of the macroscopic nuclear spin magnetic moment, and then affect the performance of the gyroscope. Considering the requirements of miniaturization, the wavelength modulation method is usually used to stabilize the frequency of the pump light, but this method will offset the control current of the laser, so that its power will drift slowly, and finally affect the long-term stability of the NMR gyro. Bias stability under . The invention can make the gyroscope maintain long-term zero bias stability under the condition of slow power drift, associate the power drift with the zero bias drift...

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Abstract

The invention provides a closed-loop output real-time compensation method for a magnetic resonance gyroscope. The method comprises a pump light signal acquisition and digital-to-analog conversion module, a phase-sensitive detection module, a pump light PID control module, a down-sampling and filtering module and a closed-loop output compensation module. According to the method provided by the invention, controllable association between pump light power change and gyro closed-loop output can be established under the condition that a pump light frequency closed loop is stable, a pump light closed-loop feedback signal is used as representation of the pump light power change, and after one or two transformations, the feedback signal is superimposed on the real-time gyro closed-loop output signal as the final output. According to the method, the output characteristics of the gyroscope are not influenced, but the long-time zero-bias stability of the gyroscope can be well improved.

Description

technical field [0001] The invention relates to the nuclear magnetic resonance gyroscope technology, in particular to a compensation method when the gyroscope is output in a closed loop. Background technique [0002] The atomic gyroscope is a new type of gyroscope that appeared after the rotor gyroscope, optical gyroscope, and MEMES gyroscope. Light field, temperature field and other manipulation methods can obtain the motion state of atoms, and thus indirectly obtain the motion state of the carrier. [0003] At present, the nuclear magnetic resonance gyroscope is a kind of atomic gyroscope with high maturity. It uses the rotation information of the sensitive carrier of atomic spin precession. It has the characteristics of small size, high precision, and anti-vibration. Satellites, unmanned aerial vehicles, unmanned underwater vehicles, etc. have broad application prospects for the requirements of micro-miniature high-precision inertial devices. [0004] The closed-loop ou...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01C25/00G01C19/62
CPCG01C25/005G01C19/62Y02A90/30
Inventor 贺宇刘院省霍丽君黄伟范晓婷
Owner BEIJING INST OF AEROSPACE CONTROL DEVICES
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