Resonant gyroscope rotation modulation scale self-correction system
A technology of rotation modulation and resonant gyro, which is applied in the direction of instruments, steering sensing equipment, measuring devices, etc., can solve the problems of the decline of gyro rotation modulation accuracy, improve the stability of zero bias and temperature characteristics, improve the signal-to-noise ratio, and reduce the process The effect of the influence of noise
Active Publication Date: 2022-05-06
TIANJIN NAVIGATION INSTR RES INST
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Problems solved by technology
[0005] This invention aims at the problem that the scaling factor of solid wave / resonant gyroscope changes with aging and external environment, which causes the decline of gyroscope rotation modulation accuracy, and proposes a method that can independently identify and Self-calibration system for resonant gyroscope rotating modulation scale with on-line correction of modulation scale
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[0064] The structure of the present invention will be further described below in conjunction with the accompanying drawings and through embodiments. It should be noted that this embodiment is illustrative rather than limiting.
[0065] figure 1 It is a block diagram of a resonant gyroscope rotation modulation scale self-correcting system proposed by the present invention.
[0066] The resonator 1 is the core sensitive unit of the gyroscope, and its material can be quartz, silicon-based, metal, etc. according to different application requirements and precision levels. The electrode 2 is used to drive and detect the vibration of the resonator, including contact and non-contact, such as piezoelectric ceramics and capacitors. The buffer amplifier 3 is used to extract the vibration information of the resonant oscillator 1 acquired on the electrode 2, and plays the role of signal conversion and isolation amplification, such as a charge amplifier and the like. The voltage signal c...
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The invention relates to a self-correcting system for a rotation modulation scale of a resonant gyroscope. The self-correcting system comprises a signal resolving unit, a signal processing unit and a control unit, wherein the signal resolving unit is used for extracting working state information of a harmonic oscillator through mathematical operation; the rotation modulation unit is used for modulating the standing wave azimuth angle of the gyroscope according to a preset rotation rate to uniformly sweep the integral multiple of the error period of the gyroscope; the amplitude modulation unit is used for applying a given amplitude modulation signal and generating an amplitude control signal; the signal synthesis unit is used for synthesizing the loop control signals, the rotation modulation signals and the amplitude modulation signals according to the current standing wave azimuth angle and calculating two-axis driving electrode applied voltage; the scale calculation unit is used for calculating a scale factor value at each standing wave azimuth; the function fitting unit is used for establishing a function relationship by adopting least square fitting according to the standing wave azimuth and the corresponding scale factor; and the output compensation unit is used for calculating the actively applied rotation rate and providing external output of the gyroscope after compensation. The system realizes autonomous identification and online correction of the modulation scale.
Description
technical field [0001] The invention belongs to the technical field of inertial instrument control, in particular to a resonant gyroscope rotation modulation scale self-calibration system. Background technique [0002] As a solid wave gyroscope based on the Coriolis effect, resonant gyroscopes include quartz hemispherical resonant gyroscopes, metal cylindrical resonant gyroscopes, nested ring gyroscopes, and micro-hemispherical gyroscopes. The gyro zero bias error caused by non-ideal characteristics shows the periodic characteristics of the standing wave azimuth angle that vibrates with it. By actively applying the precession control force and modulating the uniform rotation of the standing wave azimuth angle, the expression of the symmetry error can be suppressed . [0003] In order to offset the symmetry error as much as possible, a modulation rate control loop is added to ensure that the standing wave azimuth can be uniformly scanned at a constant rate when there is an u...
Claims
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Login to View More IPC IPC(8): G01C25/00G01C19/56
CPCG01C25/005G01C19/56
Inventor 丛正张悦赵丙权来琦王泽涛李世杨
Owner TIANJIN NAVIGATION INSTR RES INST