阅读说明：本技术 一种可在线自校准的双模式差分谐振式陀螺仪系统 (Dual-mode differential resonant gyroscope system capable of realizing online self-calibration ) 是由 成宇翔 赵万良 于翔宇 王伟 张嘉轩 于 2019-11-26 设计创作，主要内容包括：本发明公开了一种可在线自校准的双模式差分谐振式陀螺仪系统,该系统在力平衡模式同时驱动第一模态和第二模态,并同时检测第一模态和第二模态,从而在同一个陀螺结构上实现两个力平衡模式的谐振陀螺,并通过双模式差分,可完全抑制刚度正交误差和阻尼正交误差的干扰。本发明采用完全的物理手段对刚度正交误差和阻尼正交误差进行数学消除,避免了力平衡模式中使用电路手段仅能对刚度正交误差进行抑制的不足,简化了控制电路的复杂度,可实现谐振式陀螺零位误差的在线自校准。(The invention discloses a dual-mode differential resonant gyroscope system capable of realizing online self-calibration, which simultaneously drives a first mode and a second mode in a force balance mode and simultaneously detects the first mode and the second mode, thereby realizing a resonant gyroscope with two force balance modes on the same gyroscope structure, and completely inhibiting the interference of a rigidity quadrature error and a damping quadrature error through dual-mode differential. The method adopts a complete physical means to mathematically eliminate the rigidity quadrature error and the damping quadrature error, avoids the defect that the rigidity quadrature error can only be inhibited by using a circuit means in a force balance mode, simplifies the complexity of a control circuit, and can realize the on-line self-calibration of the zero error of the resonant gyroscope.)

1. An online self-calibratable dual-mode differential resonant gyroscope system, comprising:

harmonic oscillators symmetrical along a central axis;

the harmonic oscillator simultaneously excites two resonance modes under the action of the driving electrodes, the two resonance modes are marked as a first mode and a second mode, and the motion state of the harmonic oscillator is controlled; half of the driving electrodes are used for driving in a first mode, and the other half of the driving electrodes are used for driving in a second mode;

the detection electrodes monitor the motion states of the two resonance modes to form detection signals; recording a detection signal of a first mode as a first detection signal, and recording a detection signal of a second mode as a second detection signal; wherein, half of the detection electrodes are used for monitoring in a first mode, and the other half of the detection electrodes are used for monitoring in a second mode;

and the control circuit module is used for obtaining the angular velocity information of the harmonic oscillator by differentiating the first detection signal and the second detection signal.

2. An online self-calibratable dual-mode differential resonant gyroscope system of claim 1, wherein the resonator geometry is symmetric along a center and symmetric along an axis.

3. An online self-calibrating dual-mode differential resonant gyroscope system as claimed in claim 1 wherein the resonator is capable of rotating symmetrically at any angle along the axis of its center of mass.

4. An online self-calibratable dual-mode differential resonant gyroscope system of claim 1, wherein the harmonic oscillator has a structural form comprising at least one of hemispherical, spherical, circular, disk-shaped, toroidal, multi-toroidal, and cylindrical.

5. The on-line self-calibratable dual-mode differential resonant gyroscope system of claim 1, wherein the first mode and the second mode are excited simultaneously by the drive electrode, and the two modes are of the same frequency, amplitude and phase.

6. An online self-calibratable dual-mode differential resonant gyroscope system of claim 1, further comprising a support structure.

7. Use of an online self-calibratable dual-mode differential resonant gyroscope system as claimed in any one of claims 1 to 6, for error calibration of an open-loop control system and/or a closed-loop control system.

8. An error calibration method of the online self-calibration dual-mode differential resonant gyroscope system applied to the open-loop system as claimed in claim 7:

s1: the driving electrode sends a control signal to the harmonic oscillator, excites two resonance modes, namely a first mode and a second mode, and controls the motion state of the harmonic oscillator;

s2: the detection electrode monitors the motion states of the two resonance modes, a detection signal of the first mode is recorded as a first detection signal, and a detection signal of the second mode is recorded as a second detection signal;

s3: the first detection signal and the second detection signal are output to the control circuit module; and the control circuit module obtains the angular velocity information of the harmonic oscillator by differentiating the first detection signal and the second detection signal.

9. An error calibration method of the online self-calibration dual-mode differential resonant gyroscope system applied to the closed-loop system as claimed in claim 7:

s1: the driving electrode sends a control signal to the harmonic oscillator, excites two resonance modes, namely a first mode and a second mode, and controls the motion state of the harmonic oscillator;

s2: the detection electrode monitors the motion states of a first mode and a second mode, a detection signal of the first mode is recorded as a first detection signal, and a detection signal of the second mode is recorded as a second detection signal;

s3: the first detection signal and the second detection signal are output to a control circuit module, and the control circuit module controls the first detection signal and the second detection signal to have the same frequency, amplitude and phase and respectively outputs a first control signal and a second control signal;

s4: the first control signal and the second control signal are respectively fed into the driving electrodes in the first mode and the second mode, and the two modes are excited again to form a circulating closed loop; and meanwhile, carrying out difference on the first control signal and the second control signal to obtain the angular velocity information of the harmonic oscillator.

Technical Field

The invention relates to the field of resonant gyroscopes, in particular to a dual-mode differential resonant gyroscope system capable of realizing online self-calibration.

Background

A resonant gyro represented by a hemispherical resonant gyro and a multi-ring gyro is a novel high-precision vibrating gyro. It mainly uses a group of completely orthogonal degenerate modes as driving mode and detection mode to respectively sense the Coriolis force effect.

The working modes of the existing resonant gyroscope are mainly divided into two types: firstly, a full-angle mode, namely the standing wave of the harmonic oscillator is free to precess, and angle information is sensitive through the angle of the standing wave; and secondly, a force balance mode, namely binding the harmonic oscillator standing wave on a first mode (P mode) for driving, and detecting through a second mode (Q mode) for sensing angular velocity information.

However, due to non-ideal factors such as the material and the process error of the gyroscope, theoretical absolute orthogonality between two modes of the resonant gyroscope cannot be realized, and the use of the two working modes inevitably introduces non-ideal orthogonality errors of damping and rigidity, thereby seriously restricting the performance level of the resonant gyroscope. The existing solution mainly compensates the stiffness quadrature error in a circuit compensation mode, but lacks means for damping quadrature error.

Disclosure of Invention

The invention aims to provide a bimodal differential resonant gyroscope system, which adopts dual-mode differential, and takes the differential of detection signals on two modal detection electrodes as a gyroscope output signal for an open-loop system; for a closed-loop system, the difference of control signals on two modal driving electrodes is used as a gyro output signal, so that the interference of a rigidity quadrature error and a damping quadrature error can be completely inhibited.

In order to achieve the above object, the present invention provides an online self-calibration dual-mode differential resonant gyroscope system, comprising:

harmonic oscillators symmetrical along a central axis;

the harmonic oscillator simultaneously excites two resonance modes under the action of the driving electrodes, the two resonance modes are marked as a first mode and a second mode, and the motion state of the harmonic oscillator is controlled; half of the driving electrodes are used for driving in a first mode, and the other half of the driving electrodes are used for driving in a second mode;

the detection electrodes monitor the motion states of the two resonance modes to form detection signals; recording a detection signal of a first mode as a first detection signal, and recording a detection signal of a second mode as a second detection signal; wherein, half of the detection electrodes are used for monitoring in a first mode, and the other half of the detection electrodes are used for monitoring in a second mode;

and the control circuit module is used for obtaining the angular velocity information of the harmonic oscillator by differentiating the first detection signal and the second detection signal.

Preferably, the harmonic oscillator geometric structure is symmetrical along the center and symmetrical along the axis.

Preferably, the harmonic oscillator can rotate along the axis of the mass center of the harmonic oscillator by any angle and is symmetrical.

Preferably, the structural form of the harmonic oscillator comprises at least one of a hemisphere, a sphere, a circle, a disk, a ring, a multi-ring and a cylinder.

Preferably, the first mode and the second mode are simultaneously excited by the driving electrode, and the two modes have the same frequency, the same amplitude and the same phase.

Preferably, the system further comprises a support structure.

The invention also provides the application of the dual-mode differential resonant gyroscope system capable of realizing online self-calibration, which is applied to error calibration of an open-loop control system and/or a closed-loop control system.

The invention also provides an error calibration method for applying the online self-calibration dual-mode differential resonant gyroscope system to an open-loop system, which comprises the following steps:

s1: the driving electrode sends a control signal to the harmonic oscillator, excites two resonance modes, namely a first mode and a second mode, and controls the motion state of the harmonic oscillator;

s2: the detection electrode monitors the motion states of the two resonance modes, a detection signal of the first mode is recorded as a first detection signal, and a detection signal of the second mode is recorded as a second detection signal;

s3: the first detection signal and the second detection signal are output to the control circuit module; and the control circuit module obtains the angular velocity information of the harmonic oscillator by differentiating the first detection signal and the second detection signal.

The invention also provides an error calibration method for applying the online self-calibration dual-mode differential resonant gyroscope system to a closed-loop system, which comprises the following steps:

s1: the driving electrode sends a control signal to the harmonic oscillator, excites two resonance modes, namely a first mode and a second mode, and controls the motion state of the harmonic oscillator;

s2: the detection electrode monitors the motion states of a first mode and a second mode, a detection signal of the first mode is recorded as a first detection signal, and a detection signal of the second mode is recorded as a second detection signal;

s3: the first detection signal and the second detection signal are output to a control circuit module, and the control circuit module controls the first detection signal and the second detection signal to have the same frequency, amplitude and phase and respectively outputs a first control signal and a second control signal;

s4: the first control signal and the second control signal are respectively fed into the driving electrodes in the first mode and the second mode, and the two modes are excited again to form a circulating closed loop; and meanwhile, carrying out difference on the first control signal and the second control signal to obtain the angular velocity information of the harmonic oscillator.

The invention has the following beneficial effects:

the invention provides a dual-mode differential resonant gyroscope system capable of realizing online self-calibration, which simultaneously drives a first mode and a second mode in a force balance mode and simultaneously detects the first mode and the second mode, thereby realizing a resonant gyroscope with two force balance modes on the same gyroscope structure, and completely inhibiting the interference of a rigidity quadrature error and a damping quadrature error through dual-mode differential. The method adopts a complete physical means to mathematically eliminate the rigidity orthogonal error and the damping orthogonal error, avoids the defect that the rigidity orthogonal error can only be inhibited by using a circuit means in a force balance mode, simplifies the complexity of a control circuit, can realize the on-line self-calibration of the zero error of the resonant gyroscope, and avoids the repeated test and calibration of the zero output of the gyroscope in the application process of the gyroscope.

Drawings

FIG. 1 is a schematic diagram of a gyroscope system of the present invention;

wherein, 1-harmonic oscillator, 2-drive electrode, and 3-detection electrode.

Fig. 2 is a schematic diagram of the operation of the open loop system of the present invention.

Fig. 3 is a schematic diagram of the operation of the closed loop system of the present invention.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the present invention, "coriolis force" is a description of a deviation of a particle making a linear motion in a rotating system from a linear motion generated by the rotating system due to inertia.

As shown in fig. 1, the present invention provides an online self-calibration dual-mode differential resonant gyroscope system, which includes:

a harmonic oscillator 1 symmetrical along a central axis;

the 4 driving electrodes 2 are used for sending control signals to the harmonic oscillator 1, the harmonic oscillator 1 simultaneously excites two resonance modes under the action of the driving electrodes 2, the two resonance modes are marked as a first mode (P mode) and a second mode (Q mode), and the motion state of the harmonic oscillator 2 is controlled;

further, the 4 driving electrodes 2, wherein 2 driving electrodes are used for driving in a first mode, and the other 2 driving electrodes are used for driving in a second mode;

further, the 4 driving electrodes 2 are distributed in the 360-degree plane circumferential direction of the harmonic oscillator 1, the azimuth angle difference between each driving electrode 2 is (90 °/n), and n is the order of the gyro working degeneration mode;

the detection electrodes 3 monitor the motion states of a first mode (P mode) and a second mode (Q mode) to form detection signals; recording a detection signal of a first mode as a first detection signal, and recording a detection signal of a second mode as a second detection signal;

further, the 4 detection electrodes 3, 2 of them are used for monitoring of the first modality, and the other 2 are used for monitoring of the second modality;

further, the 4 detection electrodes 3 are distributed in the 360 ° circumferential direction of the harmonic oscillator 1, the azimuth angle difference between each detection electrode 3 is (90 °/n), and n is the order of the gyro working degeneration mode;

the control circuit module is used for obtaining the angular velocity information of the harmonic oscillator by differentiating the first detection signal and the second detection signal;

and the support structure is used for supporting the harmonic oscillator.

Further, the geometric structure of the harmonic oscillator 1 satisfies symmetry along the center, and satisfies symmetry along an axis; and the harmonic oscillator 1 can rotate at any angle along the axis of the mass center of the harmonic oscillator and is symmetrical.

Further, the structural form of the harmonic oscillator 1 includes a hemisphere, a sphere, a circle, a disk, a ring, a multi-ring, a cylinder, and the like.

Furthermore, two first modes (P modes) and two second modes (Q modes) excited by the harmonic oscillator are simultaneously excited by the driving electrode 2, and the first modes (P modes) and the second modes (Q modes) have the same frequency, amplitude and phase.

In another aspect, the present invention provides error calibration applicable to open loop control systems and/or closed loop control systems.

For an open loop system, the difference of detection signals on two modal detection electrodes is used as a gyro output signal; for a closed loop system, the difference of the control signals on the two mode drive electrodes is used as a gyro output signal.

Specifically, as a specific application example of the present invention, when the present invention is applied to an open-loop system, an online self-calibrated dual-mode differential resonant gyroscope system is applied to an error calibration method of the open-loop system, as shown in fig. 2:

s1: the driving electrode sends a control signal to the harmonic oscillator to excite two resonance modes, namely a first mode (P mode) and a second mode (Q mode), and the harmonic oscillator is controlled by the motion state;

s2: the detection electrode monitors the motion states of the two resonance modes, a detection signal of a first mode (P mode) is recorded as a first detection signal, and a detection signal of a second mode (Q mode) is recorded as a second detection signal;

s3: the first detection signal and the second detection signal are output to the control circuit module; and the control circuit module is used for obtaining the angular velocity information of the harmonic oscillator by differentiating the detection signals of the two resonance modes.

Specifically, as another specific application example of the present invention, when the present invention is applied to a closed-loop system, an online self-calibrated dual-mode differential resonant gyroscope system is applied to an error calibration method of the closed-loop system, as shown in fig. 3:

s1: the driving electrode sends a control signal to the harmonic oscillator, excites two resonance modes, namely a first mode and a second mode, and controls the motion state of the harmonic oscillator;

s2: the detection electrode monitors the motion states of a first mode (P mode) and a second mode (Q mode), a detection signal of the first mode (P mode) is recorded as a first detection signal, and a detection signal of the second mode (Q mode) is recorded as a second detection signal;

s3: the first detection signal and the second detection signal are output to a control circuit module, and the control circuit module controls the first detection signal and the second detection signal to have the same frequency, amplitude and phase and respectively outputs a first control signal and a second control signal;

s4: the first control signal and the second control signal are respectively fed into the driving electrodes in the first mode and the second mode, and the two modes are excited again to form a circulating closed loop; and meanwhile, carrying out difference on the first control signal and the second control signal to obtain the angular velocity information of the harmonic oscillator.

In summary, the present invention provides an online self-calibration dual-mode differential resonant gyroscope system, which simultaneously drives a first mode and a second mode in a force balance mode, and simultaneously detects the first mode and the second mode, thereby implementing a resonant gyroscope with two force balance modes on the same gyroscope structure, and completely suppressing the interference of a stiffness quadrature error and a damping quadrature error through dual-mode differential. The method adopts a complete physical means to mathematically eliminate the rigidity quadrature error and the damping quadrature error, avoids the defect that the rigidity quadrature error can only be inhibited by using a circuit means in a force balance mode, simplifies the complexity of a control circuit, can realize the on-line self-calibration of the zero error of the resonant gyroscope, and avoids the system calibration.

While the present invention has been described in detail with reference to the preferred embodiments, it should be understood that the above description should not be taken as limiting the invention. Various modifications and alterations to this invention will become apparent to those skilled in the art upon reading the foregoing description. Accordingly, the scope of the invention should be determined from the following claims.