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Low-Noise Low-Delay Digital Signal Processor for Resonant Micro Optic Gyro

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4 Author(s)
Huilian Ma ; Micro-Satellite Res. Center, Zhejiang Univ., Hangzhou, China ; Wenyi Wang ; Yang Ren ; Zhonghe Jin

A low-noise low-delay digital signal processor is constructed on a single field-programmable gate array. An equivalent input noise as low as 3.752 nV/√Hz is demonstrated for the digital signal processor, which can detect an equivalent Sagnac effect of 0.003°/s in a resonant micro optic gyro (RMOG) with a 2.5-cm diameter ring resonator. With the processing time reduced from hundreds of seconds to 1.1 μs , this processor significantly increases the loop gain of the feedback loop and reduces the reciprocal noise in the RMOG. Owing to the fast speed of this processor, the lock-in frequency accuracy is reduced to 0.78 Hz (1σ), which is equivalent to a rotation rate of 0.004°/s. Relationship between this digitalized RMOG output signal and angular rate is obtained from ±0.25°/s to ±400°/s. The standard deviation of the residuals between RMOG output results and linear fit curve is 0.0236°/s.

Published in:

Photonics Technology Letters, IEEE  (Volume:25 ,  Issue: 2 )