Improved non-damping comprehensive calibration method for grid INS

HUANG Weiquan; FANG Tao; WANG Zongyi

doi:10.7527/S1000-6893.2020.23921

ACTA AERONAUTICAET ASTRONAUTICA SINICA >

2020 , Vol. 41 >Issue 9: 323921 - 323921

DOI: https://doi.org/10.7527/S1000-6893.2020.23921

Electronics and Electrical Engineering and Control

Improved non-damping comprehensive calibration method for grid INS

HUANG Weiquan ,
FANG Tao ,
WANG Zongyi

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College of Automation, Harbin Engineering University, Harbin 150001, China

Received date: 2020-03-02

Revised date: 2020-03-25

Online published: 2020-05-14

Supported by

National Natural Science Foundation of China (61633008)

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Abstract

The comprehensive calibration technique is an effective method for the suppression of grid Inertial Navigation System (INS) errors. The level attitude errors caused by accelerometer biases are the key factors influencing the estimation accuracy of gyroscope drifts in comprehensive calibration. Aiming at this problem, this paper proposes an improved non-damping comprehensive calibration method. First, the objective function in the grid frame is deduced to estimate the accelerometer biases and level horizontal attitudes. Next, the P equation and ψ equation in a non-damping state are introduced. Finally, a non-damping two-point calibration scheme is designed. Before the calibration, the accelerometer biases are estimated and compensated with the velocity given by the Doppler Velocity Log (DVL). The DVL aims to eliminate the negative effect of the level attitude errors caused by accelerometer biases on the estimation accuracy of the gyroscope drifts. With the assistance of two intermittent external positions and yaw, the gyroscope drifts are estimated by the designed calibration scheme. The involved level attitude errors in the calibration scheme are estimated with the DVL. Simulation results indicate that compared with the existing works, the proposed calibration scheme further reduces the time of DVL dependence. Meanwhile, the satisfying estimation and compensation of accelerometer biases lead to the improvement of the estimation accuracy of the gyroscope drift, exhibiting obvious advantage of this method in suppressing navigation errors.

Key words： grid INS; accelerometer biases; gyroscope drifts; non-damping; DVL

Cite this article

HUANG Weiquan , FANG Tao , WANG Zongyi . Improved non-damping comprehensive calibration method for grid INS[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2020 , 41(9) : 323921 -323921 . DOI: 10.7527/S1000-6893.2020.23921

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