Commissariat &#xc0; L'&#xc9;nergie Atomique Et Aux &#xc9;nergies Alternatives

Safran

Marc Gramlich

Sophie Morales

Augustin Palacios Laloy

Etienne Brunstein

Jean-Michel Leger

Georges Remillieux

A device for measuring rotation including an NMR gyroscope having a sensing axis, a computer, a generating member configured to generate a magnetic field directed along the sensing axis, and a MEMS gyroscope rigidly connected to the NMR gyroscope, the MEMS gyroscope having a sensing axis aligned with the sensing axis of the NMR gyroscope, the MEMS gyroscope being suitable for delivering a MEMS signal representing a rotation about the sensing axis, the computer being configured to calculate, from an NMR signal output by the NMR gyroscope, information relating to a rotation about the sensing axis, and to analyse the MEMS signal over time in order to determine a current cut-off frequency, the computer also being configured to control the generating member in order to generate, over time, a magnetic field of which the amplitude is a function of the current cut-off frequency.

Device for measuring rotation, associated method and inertial navigation unit

The invention relates to a navigational aid method for an inertial navigation system including at least one inertial sensor () having a sensitive axis (X-X), each inertial sensor () comprising an ASG gyroscope () able to deliver an ASG signal representative of a rotation about the corresponding sensitive axis (X-X), and a MEMS gyroscope () able to deliver a MEMS signal representative of a rotation about the corresponding sensitive axis (X-X), the method including the steps of: between a first date and a subsequent third date, calculating a path from the MEMS signals; from the third date, calculating the path from the ASG signals; estimating a bias vector introduced by the MEMS gyroscopes (), from the MEMS signals and ASG signals; at a fourth date subsequent to the third date, resetting the path.

Navigational aid method, computer program product and inertial navigation system therefor

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Taverny, France

Marc Gramlich