摘要:
The invention relates to gyroscope equipment. The axially symmetrical Coriolis vibratory gyroscope comprises a thin-walled resonator with a hemispherical or cylindrical or toroidal form, said resonator being fixed at the center to a support and being formed with openings in that wall of the resonator which is located around said support, the number of openings being determined on the basis of the formula 4nk, where k is an integer, n is the order of oscillation modes, and the angle between two neighboring openings is equal (I), wherein said support has a symmetrical form along the longitudinal axis thereof and is fixed to a base, solenoids and electrodes are positioned on the wall of the resonator or next to the resonator for exciting and measuring two oscillation modes, the constant amplitude of one of the modes thereof being intended for monitoring a secondary oscillation mode which is sensitive to Coriolis forces, and the base is provided with a seat for the support of the resonator and with electrically insulated hermetically sealed leads which pass outwards via the base and are passed through the openings in the wall of the resonator for connection to elements of an electronics board.
摘要:
The invention relates to gyroscopic instruments. The method for calibrating the scale factor of a hydraulic angular velocity sensor or an axisymmetric vibratory gyroscope, which method uses a control amplitude signal, a control precessional signal CP and a control quadrature signal CQ for exciting the vibration of a resonator on a resonant frequency, involves a first step of pre-calibration which consists of measuring and recording an initial scale factor and the value of an initial control signal, and a second step of measuring the value of the current control signal and establishing a scale factor SF that is corrected on the basis of a proportional relationship involving the initial scale factor SF°, the initial value of the control signal Y° and the current value of the control signal Y° according to the formula SF=SF°Y/Y°.
摘要:
L'invention concerne un système de navigation inertielle pour un porteur comportant un coeur comportant des capteurs gyroscopiques permettant de déterminer sa vitesse angulaire suivant trois axes définissant un trièdre de référence, deux des axes définissant un plan de référence et le troisième axe étant perpendiculaire à ce plan. Le dispositif comporte des moyens de commande et de contrôle permettant de mettre le coeur en rotation autour du troisième axe et de déterminer la direction du nord géographique à partir des informations fournies par les capteurs gyroscopiques et par un accéléromètre placé dans le plan de référence; la rotation du coeur étant réalisée avec une période pour laquelle la valeur de la variance d'Allan de l'erreur de stabilité des capteurs gyroscopiques est inférieure à une valeur donnée garantissant la précision avec laquelle la direction du nord géographique peut-être connue.
摘要:
The invention relates to gyroscopic instruments. The method for calibrating the scale factor of a hydraulic angular velocity sensor or an axisymmetric vibratory gyroscope, which method uses a control amplitude signal, a control precessional signal CP and a control quadrature signal CQ for exciting the vibration of a resonator on a resonant frequency, involves a first step of pre-calibration which consists of measuring and recording an initial scale factor and the value of an initial control signal, and a second step of measuring the value of the current control signal and establishing a scale factor SF that is corrected on the basis of a proportional relationship involving the initial scale factor SF°, the initial value of the control signal Y° and the current value of the control signal Y° according to the formula SF=SF°Y/Y°.
摘要:
A gyroscope comprising a resonant structure and a plurality of transducers configured to drive a vibrational mode in the resonant structure and detect vibrations of the resonant structure, wherein at least one of the plurality of transducers comprises a piezoelectric mono crystal.
摘要:
The present invention is concerned with a method of calibrating a vibrating gyroscope. The method comprises exciting a vibration along an excitation axis of a resonant structure wherein the excitation axis is positioned at a first angular position, sensing the vibration of the resonant structure on a first sensing axis of the resonant structure while the excitation axis is positioned at the first angular position, generating a first sensing signal indicative of the sensed vibration of the resonant structure on the first sensing axis, rotating the excitation axis in a continuous manner around the resonant structure to a second angular position, sensing the vibration of the resonant structure on a second sensing axis of the resonant structure while the excitation axis is positioned at the second angular position, generating a second sensing signal indicative of the sensed vibration of the resonant structure on the second sensing axis and adding the first sensing signal to the second sensing signal in order to derive a bias of the gyroscope.