Abstract: This inertial navigation unit comprises a navigation data acquisition unit (1) and a first navigation stage (2) capable of calculating hybrid navigation values by combining navigation data.

Abstract: An inertial measurement device comprising a housing, a plate connected to the housing via a first stage of suspension, an inertial measurement unit comprising vibrating sensors having predetermined first resonant modes of vibration and mounted on the plate via a second stage of suspension; the first stage has a resonant frequency lower than a bandwidth of the inertial measurement unit, and the second stage has a resonant frequency higher than a resonant frequency of the first stage and lower than the first resonant modes of the vibrating sensors, the first stage having four resilient suspension elements and a center of stiffness corresponding substantially to the center of gravity of the assembly formed by the plate, the second stage, and the inertial measurement unit; the second stage having one to three resilient suspension elements.

Abstract: An inertial measurement device comprising a housing, a plate connected to the housing via a first stage of suspension, an inertial measurement unit comprising vibrating sensors having predetermined first resonant modes of vibration and mounted on the plate via a second stage of suspension; the first stage has a resonant frequency lower than a bandwidth of the inertial measurement unit, and the second stage has a resonant frequency higher than a resonant frequency of the first stage and lower than the first resonant modes of the vibrating sensors, the first stage having four resilient suspension elements and a center of stiffness corresponding substantially to the center of gravity of the assembly formed by the plate, the second stage, and the inertial measurement unit; the second stage having one to three resilient suspension elements.

Abstract: A gyroscopic system provides measurements on the basis of a vibrating gyroscope and provides a measurement signal. A periodic control signal is applied to it; in order to rotate the position of vibration, during a half period, according to a first speed profile, from a first up to a second position; and in order to rotate the position of vibration in an opposite direction during the other part of the period, according to a second speed profile, up to a third position. The measurements are based on corrected signals, each of said corrected signals, respectively for each of the vibrating gyroscopes, being obtained by; deducting the control signal from the measurement signal of the vibrating gyroscope; and taking account of errors identified on the basis of a comparison of the measurements provided by the gyroscopic system as a function of the position of vibration with reference measurements.

Abstract: A gyroscopic system provides measurements on the basis of a vibrating gyroscope and provides a measurement signal. A periodic control signal is applied to it; in order to rotate the position of vibration, during a half period, according to a first speed profile, from a first up to a second position; and in order to rotate the position of vibration in an opposite direction during the other part of the period, according to a second speed profile, up to a third position. The measurements are based on corrected signals, each of said corrected signals, respectively for each of the vibrating gyroscopes, being obtained by; deducting the control signal from the measurement signal of the vibrating gyroscope; and taking account of errors identified on the basis of a comparison, of the measurements provided by the gyroscopic system as a function of the position of vibration with reference measurements.

Abstract: A method of detecting parasitic movements while aligning an inertial unit comprising a navigation unit connected to accelerometer sensors and gyros disposed in a predetermined frame of reference, the method comprising the steps of: integrating the acceleration signal in a frame of reference that is turning in accordance with the measurement of the gyros so as to obtain a raw position signal during a predetermined duration; during this predetermined duration recording the previously calculated position signals; from an error model, determining the parameters for modeling the raw position signal; calculating a residual signal between the modeling signal and the raw position signal; and identifying a parasitic movement when the residual signal overshoots a predetermined limit threshold.