Patent ID: 9671248
Date: 2017-06-06
CPC Classifications: G01C

Claim:
1. A method of calibrating an inertial unit comprising an inertial core having three gyros mounted relative to one another so as to have sensing axes that are substantially mutually perpendicular, the gyros being vibratory axisymmetric gyros connected to actuators for setting them into vibration and detectors for adjusting an angular orientation of a vibration axis about the sensing axis, the method comprising the steps of: starting from a first position, causing the inertial core to pivot towards a second position about a pivot axis that is not in alignment with the sensing axes and that is not in alignment with a trisector of said sensing axes; between the first and second positions, taking measurements of the angular orientation of the vibration axis of each gyro, with the angular orientation being left free; returning the inertial core to the first position; adjusting the angular orientation of the vibration axis of each gyro to a value corresponding to the second position; causing the inertial core to pivot towards the second position about the pivot axis; taking measurements of the angular orientation of the vibration axis of each gyro during pivoting of the inertial core, angular orientation being left free during pivoting; and calibrating the inertial core by applying correction terms as a function of the measurements taken.