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Safran Electronics & Defense

Vincent Ragot

Alain Renault

Jean-Michel Caron

Alain Jeanroy

Method of angular measurement by a resonator associated with a vibration setting device and with a vibration detector, which are linked to a processing circuit through which there travel control signals and measurement signals, the method comprising the steps of digitizing the measurement signals and of deducing an angular measurement from the measurement signals. The method comprises the steps of performing a spectral analysis of the digitized measurement signals so as to detect harmonic distortions therein and correcting at least some of the signals travelling through the processing circuit so as to attenuate the non-linearities.

Method and device for angular measurement with compensation of non-linearities

Method of angular measurement by means of a sensor comprising an axisymmetric resonator associated with means for setting the resonator into vibration and with means for detecting an orientation of the vibration with respect to a reference frame of the sensor, comprising the steps of applying a precession control so as to slave an orientation of the vibration to an angular setpoint value and of determining an angular measurement on the basis of the precession control. The method comprises a phase of modulating the angular setpoint value in such a way that the said setpoint value uniformly sweeps an angular span of &#x3c0; radians and that a temporal derivative of the setpoint is deducted from the precession control prior to the determination of the angular measurement.

Method of angular measurement by means of a vibrating sensor to which modulated controls are applied

A method of correcting the gain of a capacitive member having electrodes that are movable relative to each other including the steps of successively applying to one of the electrodes, reduced bias voltages having opposite signs and a common value below a threshold for which a remanent field generated by said reduced bias voltages can be measured, making corresponding measurements of the output signals from the capacitive member; taking an average, and correcting the gain of the capacitive member as a function of the measured output signal.

Method of correcting the gain of a capacitive member, and a device for implementing the method

A method of controlling an inertial rotation sensor has a vibrating resonator having control channels and detection channels. During an operating stage each control channel (C, C) is activated for a control duration and each detection channel (D, D) is activated for a detection duration, in which the control and detection durations are applied at an operating ratio. Duyring a starting stage the control and detection durations are applied at a ratio that is modified in comparison with the operating ratio, so as to increase the control duration.

Method for controlling a sensor with a quick-start vibrating resonator

An inertial rotation sensor including a vibrating member having facing metal-plated portions forming a variable capacitance capacitor associated with a low impedance load circuit via a multiplexer/demultiplexer member.

Drift-compensated inertial rotation sensor

The method serves to compensates anisotropy in an inertial rotation sensor comprising a metallized vibrating bell () having a bias voltage applied thereto, the vibrating bell () having an edge () electrodes (), and the method comprises the steps of measuring, preferably by multiplexing, the anisotropy between the electrodes and of applying to the electrodes a fraction of the bias voltage that depends on the differences measured between the electrodes.

Method of compensating anisotropy in a vibrating-bell inertial rotation sensor

The inertial rotation sensor comprising a vibrating resonator associated with transducers defining a pair of control channels and a pair of detection channels, preferably comprises a single multiplexer member for all of the channels, the multiplexer member being associated with a processing unit generating cycles comprising control action times on each control channel followed by detection action times on each detection channel, with two succession action times being separated by a relaxation time.

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Paris, France

Vincent Ragot