Anti-aliasing multi-bit sigma-delta modulated cobweb-like disk resonator gyroscope with extending input range.

Area of Science:

• Mechanical Engineering
• Electrical Engineering
• Sensor Technology

Background:

• Traditional sigma-delta modulation (ΣΔΜ) gyroscope systems face limitations in input angular rate signal range and performance metrics.
• Single-bit ΣΔΜ systems often require higher actuation voltages to achieve wider ranges, impacting efficiency and design complexity.

Purpose of the Study:

• To introduce a novel cobweb-like disk resonator gyroscope (CDRG) integrated with a multi-bit electro-mechanical ΣΔΜ system.
• To significantly expand the input angular rate signal range and improve key performance metrics like signal-to-noise ratio (SNR) and noise reduction.
• To overcome the limitations of single-bit ΣΔΜ gyroscope systems through a linear multi-bit force feedback mechanism.

Main Methods:

• Integration of a multi-bit electro-mechanical sigma-delta modulation (ΣΔΜ) system into a CDRG.
• Implementation of a linear multi-bit force feedback mechanism utilizing nonlinear actuators driven by pulse density modulation.
• Experimental evaluation of the proposed gyroscope system without electronic trimming.

Main Results:

• The novel CDRG system demonstrated a 30% improvement in input range compared to traditional ΣΔΜ CDRG configurations.
• Significant enhancements were observed in angle random walk (106.2% improvement) and bias instability (487.9% improvement).
• The design successfully broadened the input range without requiring higher actuation voltages.

Conclusions:

• The proposed multi-bit ΣΔΜ CDRG system offers a substantial performance upgrade over conventional designs.
• This innovative approach effectively expands the operational range and enhances the precision of disk resonator gyroscopes.
• The system provides a more efficient and effective solution for high-performance angular rate sensing applications.