Space Gyro: A New Method for Calibration

摘要

The interest of this method is that it provides a good representativity of a real motion (by exciting the gyro in three dimensions), it allows a simple handling of equipment and test facilities (with all parameters being estimated in one run), and it provides a good robustness to single false measurement (by filtering the gyro output). Moreover, this method requires shorter test durations and allows the use of a two-axis table (instead of the 3 axes table), which represents a noticeable gain in cost (bearing in mind that test cost represents more than 20% of the overall cost of a space unit). Also, by reprocessing the gyro raw outputs and compensating them with estimated error parameters, the software allows to check the estimation validity and efficiency : both model and parameters are validated before passing it to the user of the sensor. Finally, the software architecture and the high level language (Matlab commercial package) used for this tool guarantee the ability for easy evolution and adaptation to other gyro technology (FOG, MEMS....) testing. The development and validation phase is now achieved. From now, this method will be used on all DTG gyros on recurrent Telecom flight models. The next phase will then be to adapt the method to other gyros such as Fiber Optic Gyros (under development).