研究目的
To propose an on-orbit dynamic calibration method for the MHD micro-angular vibration sensor to calibrate its complex sensitivity in high frequency, addressing the issue of parameter variation after lift-off.
研究成果
The proposed system effectively calibrates the MHD micro-angular vibration sensor's complex sensitivity with high repeatability and linearity, within a frequency range of 25–800 Hz and angular velocity range of 0.076–7590 mrad/s. The expanded uncertainties of the amplitude and phase shift are 0.04% and 1.2? (k = 2), respectively. Future work aims to address vibration mode problems and achieve higher accuracy.
研究不足
1. The phase shift uncertainty is larger than 1?, possibly due to complex vibration modes at high frequencies. 2. The homodyne interferometry method is influenced by air turbulence and temperature differences. 3. The calibration method has not achieved the micro-radian scale. 4. The system's accuracy verification relies on unilateral comparison with accelerometer measurements. 5. The system's volume and weight need reduction for actual use. 6. Spacecraft vibration may affect calibration accuracy, requiring damping measures.
