Resonant fiber optic gyro based on a sinusoidal wave modulation and square wave demodulation technique

Area of Science:

• Optical Engineering
• Sensor Technology
• Signal Processing

Background:

• Resonant fiber optic gyros (RFOGs) are optical sensors measuring rotation rate.
• RFOG sensitivity depends on digital signal processing to detect Sagnac effect frequency differences and suppress noise.

Purpose of the Study:

• To introduce a novel phase modulation technique for RFOGs.
• To improve the detection sensitivity and performance of RFOGs.

Main Methods:

• Implemented a new sinusoidal wave modulation and square wave demodulation technique.
• Simulated and measured the system's demodulation curve.
• Utilized digital signal processing for phase modulation.

Main Results:

• The new technique increased the demodulation curve slope by 1.56 times compared to previous methods.
• Improved spectrum efficiency of the modulated signal.
• Reduced field-programmable gate array resource occupancy.
• Achieved a short-term bias stability of 1.08°/h, a 1.47-fold improvement.

Conclusions:

• The novel phase modulation technique significantly enhances RFOG performance.
• This advancement leads to improved rotation rate measurement sensitivity and bias stability.