Patent ID: 9217640
Filing Date: 2015-12-22
Classification: G01C

Abstract:
1. Method for gyroscopic measurements supplied by a gyroscopic navigation system comprising at least three vibrating gyroscopes, each of said gyroscopes vibrating in a first initial geometric position of vibration and supplying a measurement signal; wherein a periodic control signal is applied to each of said vibrating gyroscopes, over a time period, in order to: rotate the geometric position of vibration in a first direction, during a portion of the time period, according to a first speed profile, causing a change in the position of the vibration of said gyroscope from the first geometric position of vibration to a second geometric position of vibration; and rotate the geometric position of vibration in a second direction opposite the first direction, during the remaining portion of the time period, according to a second speed profile, causing a change in the position of the vibration of said gyroscope from the second geometric position of vibration to a third geometric position of vibration; said control signal having a zero mean over said time period, and the first and second speed profiles indicating a variation in the speed of the change of geometric position of vibration over time; wherein the measurements provided by the gyroscopic system are based on corrected signals, with each of said corrected signals, respectively for each of the vibrating gyroscopes, representing a variation in the geometric position of vibration values and being obtained by: subtracting the control signal from the measurement signal supplied by said vibrating gyroscope; and taking into account errors identified on the basis of comparing measurements supplied by the gyroscopic system as a function of the position of vibration, with reference measurements.