Rate-of-turn sensor
First Claim
1. A method for driving and simultaneously evaluating a rate-of-turn sensor having at least one oscillator element oscillating along a first axis of oscillation, and at least one Coriolis element located on the oscillator element and swinging along a second axis of oscillation, the second axis being normal to the first axis, the method comprising the steps of:
- generating a digital drive signal with an excitation frequency that corresponds to a resonant frequency of the oscillator element;
performing digital-analog conversion of a digital drive signal to produce an analog drive signal, and driving the oscillator element with the analog drive signal;
sensing a Coriolis velocity of the Coriolis element generated by a rotation of the rate-of-turn sensor around a third axis of rotation that is normal to both the first and second axes, and generating an analog Coriolis signal that is proportional to the Coriolis velocity;
performing analog-digital conversion of the analog Coriolis signal to produce a digital Coriolis signal;
in-phase multiplying the digital Coriolis signal with the digital drive signal to produce an intermediate signal;
generating a control signal based on the intermediate signal, which is proportional to a rate of turn of the rate-of-turn sensor;
multiplying the control signal with the digital drive signal to produce a digital compensation signal that is in-phase with the digital drive signal;
performing digital-analog conversion of the digital compensation signal to produce an analog compensation signal that is in-phase with the analog drive signal, and applying the analog compensation signal to the Coriolis element; and
outputting a control signal.
1 Assignment
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Accused Products
Abstract
A method for operation of and simultaneous analysis of a rate-of-turn sensor, comprising an oscillator element and a Coriolis element arranged on the oscillation element is disclosed, comprising the following method steps: generation of a digital operating signal with an excitation frequency corresponding to the resonant frequency of the oscillator element, digital to analogue conversion of the digital operating signal and operation of the oscillator element with the analogue operating signal, recording a Coriolis speed of the Coriolis element occurring about a normal to both oscillation axes due to the rotation of the rate-of-turn sensor with generation of an analogue Coriolis'"'"' signal proportional to the Coriolis speed, analogue-to-digital conversion of the analogue Coriolis signal, phase-sensitive multiplication of the digital Coriolis signal with the digital operating signal to form an intermediate signal, generation of a control signal proportional to the rate of turn of the rate-of-turn sensor from the intermediate signal, multiplication of the control signal with the digital operating signal to give a digital compensation signal in phase with the digital operating signal, digital-to-analogue conversion of the digital compensation signal to give an analogue compensation signal in phase with the analogue operating signal and subjecting the Coriolis element to the analogue compensation signal and output of the control signal.
14 Citations
12 Claims
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1. A method for driving and simultaneously evaluating a rate-of-turn sensor having at least one oscillator element oscillating along a first axis of oscillation, and at least one Coriolis element located on the oscillator element and swinging along a second axis of oscillation, the second axis being normal to the first axis, the method comprising the steps of:
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generating a digital drive signal with an excitation frequency that corresponds to a resonant frequency of the oscillator element; performing digital-analog conversion of a digital drive signal to produce an analog drive signal, and driving the oscillator element with the analog drive signal; sensing a Coriolis velocity of the Coriolis element generated by a rotation of the rate-of-turn sensor around a third axis of rotation that is normal to both the first and second axes, and generating an analog Coriolis signal that is proportional to the Coriolis velocity; performing analog-digital conversion of the analog Coriolis signal to produce a digital Coriolis signal; in-phase multiplying the digital Coriolis signal with the digital drive signal to produce an intermediate signal; generating a control signal based on the intermediate signal, which is proportional to a rate of turn of the rate-of-turn sensor; multiplying the control signal with the digital drive signal to produce a digital compensation signal that is in-phase with the digital drive signal; performing digital-analog conversion of the digital compensation signal to produce an analog compensation signal that is in-phase with the analog drive signal, and applying the analog compensation signal to the Coriolis element; and outputting a control signal. - View Dependent Claims (2, 3, 4, 5)
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6. A circuit design for driving and simultaneously evaluating a rate-of-turn sensor having at least one oscillator element oscillating along a first axis of oscillation, and at least one Coriolis element located on the oscillator element and swinging along a second axis of oscillation, the second axis being normal to the first axis, comprising:
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means for generating a digital drive signal with an excitation frequency that corresponds to a resonant frequency of the oscillator element; means for carrying out digital-analog conversion of the digital drive signal to produce an analog drive signal to drive the oscillator element; means for sensing a Coriolis velocity of the Coriolis element generated by a rotation of the rate-of-turn sensor around a third axis being normal to the first and second axes, and for generating an analog Coriolis signal that is proportional to the Coriolis velocity; means for performing analog-digital conversion of the analog Coriolis signal to produce a digital Coriolis signal; means for in-phase multiplying the digital drive signal with the Coriolis signal to produce an intermediate signal; means for generating a control signal based on the intermediate signal, which is proportional to a rate of turn of the rate-of-turn sensor; means for multiplying the control signal with the digital drive signal to produce a digital compensation signal that is in-phase with the digital drive signal; means for performing digital-analog conversion of the digital compensation signal to produce an analog compensation signal that is in-phase with the analog drive signal, and for applying the analog compensation signal to the Coriolis element; and means for outputting a control signal. - View Dependent Claims (7, 8, 9, 10, 11, 12)
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Specification