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Random error modeling and compensation method for ring laser device based on adaptive Kalman filtering

An adaptive Kalman and ring laser technology, applied in the field of inertial calibration, can solve the problems of ring laser calibration accuracy degradation, affecting the accuracy of state equations and measurement equations, etc., to reduce model errors, eliminate the influence of random noise, and improve calibration The effect of precision

Active Publication Date: 2019-10-25
BEIJING CHANGCHENG INST OF METROLOGY & MEASUREMENT AVIATION IND CORP OF CHINA
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Problems solved by technology

However, the standard Kalman filter equation requires that the process noise and observation noise are expected to be zero and uncorrelated white noise sequences, while the random noise in the ring laser is colored noise, which affects the accuracy of the state equation and measurement equation, making Alignment Accuracy Decreases for Ring Lasers

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  • Random error modeling and compensation method for ring laser device based on adaptive Kalman filtering
  • Random error modeling and compensation method for ring laser device based on adaptive Kalman filtering
  • Random error modeling and compensation method for ring laser device based on adaptive Kalman filtering

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[0053] In this embodiment, according to the method described in the content of the invention, the ring laser is used to calibrate the servo turntable, and a random error modeling and compensation method based on adaptive Kalman filtering is designed, which eliminates the influence of random noise on the ring laser and improves the Calibration accuracy.

[0054] Random error modeling and compensation methods based on adaptive Kalman filtering, such as figure 2 As shown, it is mainly divided into the following steps:

[0055] Step 1. Place the ring laser on the turntable, test the output pulse number of the ring laser at rest, perform data processing, and calculate the variance.

[0056] like figure 1 As shown, fix the ring laser at the center of the turntable. The axis of the laser should coincide with the axis of the turntable. After connecting the line, open the test software, start the ring laser to warm up for 30 minutes, and set the sampling interval by controlling the ...

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Abstract

The invention relates to a turntable on-site rapid calibration device based on a ring laser device, and proposes a random error modeling and compensation method for a ring laser device based on adaptive Kalman filtering. The random error modeling and compensation method belongs to the technical field of inertia calibration, and comprises the steps of: conducting an experimental test to obtain output pulse data of the ring laser device; processing the data and calculating Allan variance; establishing an auto-regressive moving average model (ARMA model) according to the Allan variance; and identifying an order and parameters of the model by utilizing a BIC criterion and the least square method; and designing a compensation method based on adaptive Kalman filtering for the ARMA model, reducing the influence of random errors on model precision, and effectively improving the calibration precision of the ring laser device. The random error modeling and compensation method utilize the annular laser calibration method to realize calibration of an on-site turntable, is simple in operation and has high environmental adaptability, can be used in a wide temperature range, and has the advantages of high precision, good reliability, large dynamic range, no mechanical noise influence and the like.

Description

technical field [0001] The invention relates to an on-site rapid calibration device for a turntable based on a ring laser, and proposes an adaptive Kalman filtering ring laser random error modeling and compensation method, which belongs to the technical field of inertial calibration. Background technique [0002] In recent years, servo turntables have been widely used in aviation, aerospace, weapons, ships, nuclear industry, electronics and other industries. The quality of turntable performance is directly related to the accuracy, reliability and credibility of inertial device parameter verification. The ability to quickly and conveniently calibrate the turntable in the field environment to meet high test accuracy and measurement resolution is the basis for ensuring the accuracy and performance of military, aviation, aerospace and other military system products and weapon systems. [0003] The four-frequency ring laser is a new type of laser gyro newly developed in the Unit...

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Application Information

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IPC IPC(8): G01C25/00
CPCG01C25/005
Inventor 王敏林董雪明代洁
Owner BEIJING CHANGCHENG INST OF METROLOGY & MEASUREMENT AVIATION IND CORP OF CHINA
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