A Novel Closed-Loop Single-Channel Time Division Multiplexing Detection Circuit for Hemispherical Resonator Gyroscope

Area of Science:

• * Mechanical Engineering
• * Electrical Engineering
• * Sensor Technology

Background:

• * Hemispherical Resonator Gyroscopes (HRGs) utilize orthogonal X/Y channels for vibration state detection and control.
• * HRG performance is significantly limited by gain and phase delay asymmetry between these X/Y channels.
• * Traditional dual-channel circuits present deficiencies that impact overall gyroscope accuracy.

Purpose of the Study:

• * To propose a novel detection circuit for HRGs that overcomes X/Y channel asymmetry.
• * To enhance the stability and symmetry of X/Y channel gain within the closed-loop system.
• * To eliminate intra-loop phase delays and mitigate detection errors for improved HRG performance.

Main Methods:

• * A closed-loop, single-channel time division multiplexing circuit was designed.
• * A mathematical model was developed to analyze time division detection errors.
• * An improved demodulation method was proposed to reduce these detection errors.

Main Results:

• * The novel circuit successfully achieved symmetry and stability in X/Y channel gain.
• * Phase delays within the closed loop were effectively eliminated.
• * Experimental results confirmed the suppression of gain and phase delay drift.

Conclusions:

• * The proposed detection circuit significantly enhances HRG performance by resolving X/Y channel asymmetry.
• * The time division multiplexing approach and improved demodulation effectively mitigate detection errors.
• * This solution offers a pathway to more accurate and stable hemispherical resonator gyroscope systems.