Integral precession calibration method of PIGA on linear vibration table


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Linear vibration table can provide harmonic accelerations to excite the nonlinear error terms of Pendulous Integrating Gyro Accelerometer (PIGA). Integral precession calibration method is proposed to calibrate PIGA on a linear vibration table in this paper. Based on the precise expressions of PIGA's inputs, the error calibration model of PIGA is established. Precession angular velocity errors of PIGA are suppressed by integer periodic precession and the errors caused by non -integer periods vibrating are compensated. The complete calibration process, including planning, preparation, PIGA testing, and coefficient identification, is designed to optimize the test operations and evaluate the calibration results. The effect of the main errors on calibration uncertainty is analyzed and the relative sensitivity function is proposed to further optimize the test positions. Experimental and simulation results verify that the proposed 10 -position calibration method can improve calibration uncertainties after compensating for the related errors. The order of calibration uncertainties of the second- and third -order coefficients are decreased to 10-8 (rad center dot s-1)/g2 and 10-8 (rad center dot s-1)/g3, respectively. Compared with the other two classical calibration methods, the calibration uncertainties of PIGA's nonlinear error coefficients can be effectively reduced and the proportional residual errors are decreased less than 3 x 10-6 (rad center dot s-1)/g by using the proposed calibration method. (c) 2023 Production and hosting by Elsevier Ltd. on behalf of Chinese Society of Aeronautics and Astronautics. This is an open access article under the CC BY -NC -ND license ( licenses/by-nc-nd/4.0/).
PIGA,Linear vibration table,Vibration measurement,Calibration,Error analysis,Uncertainty analysis
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