Method of determining a speed of rotation of an axially symmetrical vibrating sensor, and a corresponding inertial device
AssigneeSagem Defense Securite
InventorJean-Michel Caron
Life of this patent
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Abstract
The method of determining the speed of rotation of an axially symmetrical vibrating sensor of order 2. The method includes: performing a first evaluation of the speed of rotation while a vibration generated by the vibrating sensor lies in a first position relative to electrodes generating the vibration; applying a precession command so that the vibration comes successively into positions that are offset by 45°, 90°, and 135° relative to the first position; performing evaluations of the speed of rotation while the vibration lies in the offset positions; and taking a mean of the evaluations of the speed of rotation in the various positions of the vibration.
Claims10
A method of determining a speed of rotation of an axially symmetrical vibrating sensor having a vibrating member associated with control electrodes and with detection electrodes for generating vibration presenting an elastic line possessing periodicity of order n and having a position that is variable as a function of the rotation of the sensor, the method comprising the steps of:
- performing a first evaluation of the speed of rotation when the vibration is in a first position relative to the control electrodes and the detection electrodes;
- applying a precession command using a pre-established scale factor until the vibration reaches a second position geometrically offset by π/n relative to the first position;
- performing a second evaluation of the speed of rotation while the vibration is in the second position;
- and
- taking a mean of the evaluations of the speed of rotation in the first position and in the second position.
An inertial device comprising an axially symmetrical vibrating sensor having a vibrating member associated with control electrodes and with detection electrodes, and means for exciting the sensor so as to generate a vibration, the device including means for performing a first evaluation of the speed of rotation of the sensor while the vibration is in a first position relative to the control electrodes and the detection electrodes, means for applying a precession command using a pre-established scale factor until the vibration reaches a second position offset by π/n relative to the first position, where n is a periodicity order of an elastic line of the sensor, means for performing a second evaluation of the speed of rotation of the sensor while the vibration is in the second position, and means for taking a mean between the evaluations of the speed of rotation of the sensor in the first position of the vibration and in the second position of the vibration.
Dependencies are inferred from the claim text.