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Control device for working point of four-frequency laser gyro

A four-frequency laser gyro and control device technology, which is applied to Sagnac effect gyroscopes and other directions, can solve the problems related to the zero bias and zero bias stability of the four-frequency laser gyro, high magnetic sensitivity, and affecting the stability of the control loop.

Inactive Publication Date: 2011-04-06
NAT UNIV OF DEFENSE TECH
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Problems solved by technology

This method is relatively easy to implement, but it has many disadvantages: 1. It needs two photoelectric detection and amplification circuits. Any asymmetry in the conversion coefficient or bias of the two signals will affect the zero bias, resulting in the zero bias sum of the four-frequency laser gyroscope. The stability of the zero bias is related to the circuit; 2. There is no special selection of the best operating point, resulting in a large magnetic sensitivity; 3. The changes in the gyro parameters such as the light intensity of the gyro and the sensitivity of the piezoelectric ceramic affect the stability of the control loop

Method used

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  • Control device for working point of four-frequency laser gyro
  • Control device for working point of four-frequency laser gyro
  • Control device for working point of four-frequency laser gyro

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Embodiment Construction

[0027] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0028] exist figure 2 Among them, part of the light field transmitted from the transmission sheet 13 of the four-frequency laser gyroscope 1 is incident on the photodetector 15, and the photodetector 15 can convert the optical signal from direct current to 1 GHz frequency range into an electrical signal, and then pass through the radio frequency amplifier 16 For amplification, the radio frequency amplifier 16 amplifies the radio frequency component in the electrical signal output by the photodetector 15 . The band-pass filter 17 allows signals with a frequency around the beat frequency of the co-directional traveling wave to pass through, and can also filter out part of the noise to improve the signal-to-noise ratio of the signal. The amplitude demodulator 18 detects the amplitude of the radio frequency signal output by the bandpass filter 17 , which ...

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Abstract

The invention discloses a control device for a working point of a four-frequency laser gyro. The device comprises a reflector position servo loop, an automatic modulation amplitude control loop and an automatic gain control loop, and coupling is absent among the three loops. The three control loops simultaneously work, the four-frequency laser gyro stably works at any working point, such as a working point with the lowest magnetic sensitivity or temperature sensitivity. Therefore, the anti-jamming capability of the four-frequency laser gyro is improved.

Description

technical field [0001] The invention relates to a control device for the working point of a four-frequency laser gyro, in particular to a digital control device for making the four-frequency laser gyro work at any working point. 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 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01C19/66
Inventor 龙兴武汪之国王飞
Owner NAT UNIV OF DEFENSE TECH
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