Optimization of the resonant frequency servo loop technique in the resonator micro optic gyro

Ren, Yang; Jin, Zhonghe; Chen, Yan; Ma, Huilian

doi:10.1631/jzus.c1000441

Cited by 13 publications

(11 citation statements)

References 19 publications

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“…At the same time, if the proportional gain is too high, the system becomes unstable. Loop delay limits the maximum proportional gain [10]. The integral term can eliminate the residual steady-state error, but it may narrow the frequency bandwidth of the system.…”

Section: System Designmentioning

confidence: 99%

“…To reduce more frequency noise and improve the accuracy of the system, a high loop gain is preferred. However, the maximum loop gain is limited by the loop delay [10]. Figure 8 shows the Bode plots of the open-loop and the closed-loop transfer functions at different loop delays.…”

Section: Loop Delaymentioning

confidence: 99%

“…Such PI circuits contribute hundreds of microseconds processing time delay. It has been found that this large-loop delay limits the maximum loop gain of the resonant-frequency servo loop and further degrades noise performance of the RFOG [10].…”

Section: Introductionmentioning

confidence: 99%

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

Yao

et al. 2012

Appl. Opt.

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Resonator fiber-optic gyro (RFOG) is a high-accuracy inertial rotation sensor based on the Sagnac effect. A high-accuracy resonant frequency servo loop is indispensable for a high-performance RFOG. It is composed of a frequency discriminator, a loop filter, and a laser actuator. Influences of the loop parameters are fully developed. Optimized loop parameters are obtained by considering the noise reduction and wide dynamic performance of the RFOG. As a result, with the integration time of 10 s, the accuracy of the resonant frequency loop is increased to 0.02 Hz (1σ). It is equivalent to a rotation rate of 0.067°/h, which is close to the shot noise limit for the RFOG, while a minimum rotation of ±0.05°/s has been carried out simultaneously. These are the best results reported to date, to the best of our knowledge, for an RFOG using the miniature semiconductor laser that benefits from the optimization of the resonant frequency servo-loop parameters.

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Section: System Designmentioning

confidence: 99%

Section: Loop Delaymentioning

confidence: 99%

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

Yao

et al. 2012

Appl. Opt.

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“…It has been widely investigated in recent decades [10][11][12][13]. Although the short-term bias stability of the RIOG has been reached, 1.85 × 10 −4 rad∕s (0.0106 deg ∕s) for 60 seconds [14], the long-term performance is affected by backscattering noise [15][16][17], polarization noise [18,19], accuracy of frequency-locking loop [20][21][22], and so on. Much work is required to improve the performance of the RIOG.…”

Section: Introductionmentioning

confidence: 99%

“…A proportional integrator (PI) has been adopted in the frequency-locking loop based on the commercial data acquisition board (National Instrument DAQ module) and LabVIEW software. Although the loop delay was 682.16 μs, the equivalent bandwidth was 0.16 Hz resulted by 1 s time constant of the low pass filter (LPF), and the frequency-locking process of 0.0052 s was obtained [20]. The bandwidth of frequency-locking loop was limited by the large loop delay contributed by the PI scheme on NI LabVIEW [14,20].…”

Section: Introductionmentioning

confidence: 99%

Low-delay, high-bandwidth frequency-locking loop of resonator integrated optic gyro with triangular phase modulation

et al. 2013

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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 deg/s, which is close to the ultimate sensitivity of the RIOG. Moreover, the bias stability of the RIOG is improved to 0.45 deg/s (10 s integrated time) based on the frequency-locking loop.

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Test for scale factor of resonant micro optical gyro based on equivalent input

Lei¹,

Feng²,

Zhi³

et al. 2013

Optik

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Optimization of the resonant frequency servo loop technique in the resonator micro optic gyro

Cited by 13 publications

References 19 publications

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

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

Low-delay, high-bandwidth frequency-locking loop of resonator integrated optic gyro with triangular phase modulation

Test for scale factor of resonant micro optical gyro based on equivalent input

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