Abstract

A frequency-locking loop affects the bandwidth and output of the resonator integrated optic gyro (RIOG). A low-delay, high-bandwidth frequency-locking loop is implemented on a single field-programmable gate array with triangular phase modulation. The signal processing delay is reduced to less than 1 μs. The loop model is set up, and the influences of loop parameters on the bandwidth and unit step response are analyzed; the bandwidth of 10 kHz is obtained with the optimized loop parameters. As a result, the accuracy of the frequency-locking loop is reduced to 1.37 Hz (10 s integrated time). It is equivalent to a rotation rate of $0.005\mathrm{deg}/\mathrm{s}$, which is close to the ultimate sensitivity of the RIOG. Moreover, the bias stability of the RIOG is improved to $0.45\mathrm{deg}/\mathrm{s}$ (10 s integrated time) based on the frequency-locking loop.

© 2013 Optical Society of America

Suppression of backreflection noise in a resonator integrated optic gyro by hybrid phase-modulation technology

Lishuang Feng, Ming Lei, Huilan Liu, Yinzhou Zhi, and Junjie Wang
Appl. Opt. 52(8) 1668-1675 (2013)

Reduction of backscattering noise in a resonator integrated optic gyro by double triangular phase modulation

Yinzhou Zhi, Lishuang Feng, Junjie Wang, and Yichuang Tang
Appl. Opt. 54(1) 114-122 (2015)

Effect of intensity variation of laser in resonator integrated optic gyro

Ming Lei, Lishuang Feng, Yinzhou Zhi, and Huilan Liu
Appl. Opt. 52(19) 4576-4581 (2013)

Full investigation of the resonant frequency servo loop for resonator fiber-optic gyro

Huilian Ma, Xiao Lu, Linzhi Yao, Xuhui Yu, and Zhonghe Jin
Appl. Opt. 51(21) 5178-5185 (2012)

Reduction of angle random walk by in-phase triangular phase modulation technique for resonator integrated optic gyro

Junjie Wang, Lishuang Feng, Qiwei Wang, Xiao Wang, and Hongchen Jiao
Opt. Express 24(5) 5463-5468 (2016)