Measurement method for PIGA precession during integer periods on linear vibration table

In order to improve the calibration precision of PIGA (pendulous integrating gyro accelerometer) on linear vibration table, a measurement method for PIGA precession during integer periods on linear vibration table is proposed. The concerned integral time data of the PIGA precession within integer periods under the vibration state and the static state are measured while the PIGA's input axis is installed on linear vibration table straight upwards and downwards respectively. The corresponding average precession angular rates of PIGA are calculated, and the calibration error model of the PIGA on a linear vibration table is derived by the relationship between the average precession angular rates and the model outputs of the PIGA. The error model coefficients, including the bias, the scale factor, the second-order coefficient and the third-order coefficient, are identified finally. By this testing method, the precession angular rate error of the PIGA is suppressed, and the accuracy of the test on linear vibration table is improved. Simulation results show that the method can accurately identify the error coefficients of PIGA, and the identification precision reaches 10^-7, which improves the calibration precision of PIGA on linear vibration table.