Elimination of Crosstalk from Digital Closed-Loop Fiber Optic Gyroscopes via Polymorphic Modulation Method

Yanran Lü; Jiajun Ma; Yueruihan Huang; Qingyang Liu; Zipeng Zhang; Junbiao Jiang

doi:10.3788/CJL202249.0706003

Chinese Journal of Lasers, Volume. 49, Issue 7, 0706003(2022)

Elimination of Crosstalk from Digital Closed-Loop Fiber Optic Gyroscopes via Polymorphic Modulation Method

Yanran Lü¹, Jiajun Ma^1、*, Yueruihan Huang¹, Qingyang Liu¹, Zipeng Zhang¹, and Junbiao Jiang²

Author Affiliations

¹College of Big Data and Information Engineering, Guizhou University, Guiyang, Guizhou 550025, China

²Xi’an Modern Control Technology Research Institute, Xi’an, Shaanxi 710065, China

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Figures & Tables(12)

Fig. 1. Modulated crosstalk coupling path diagram

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Fig. 2. Waveform construction of polymorphic modulation sequence. (a) A polymorphic modulation phase modulation sequence is applied to a clockwise beam; (b) a polymorphic modulation phase modulation sequence is applied to a counterclockwise beam; (c) polymorphic modulation sequence waveform

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Fig. 3. Modulation and demodulation of speed error

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Fig. 4. Modulation and demodulation of gain error

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Fig. 5. RTL view of polymorphic modulation

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Fig. 6. 32-state modulation in FPGA implementation block diagram

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Fig. 7. Schematic of 32-state speed modulation

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Fig. 8. Schematic of 32-state gain modulation

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Fig. 9. Dead zone test curves under different modulation depths. (a) Modulation depth of π/2; (b) modulation depth of 2π/3；(c) modulation depth of 3π/4; (d) modulation depth of 4π/5; (e) modulation depth of 5π/6; (f) modulation depth of 7π/8

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Table 1. Modulation modes under different modulation depths

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Table 1. Modulation modes under different modulation depths

Modulation depth	Modulation method	Modulation sequence
π/2	8-state square wave modulation	φ_m＋C₁，…，2π－φ_m＋C₄，C₁，…，C₄
2π/3	6-state square wave modulation	φ_m＋C₁，2π－φ_m＋C₂，φ_m＋C₃，C₁，C₂，C₃
3π/4	16-state square wave modulation	φ_m＋C₁，…，2π－φ_m＋C₆，…，C₁，…，C₈
4π/5	10-state square wave modulation	φ_m＋C₁，…，2π－φ_m＋C₄，…，C₁，…，C₅
5π/6	24-state square wave modulation	φ_m＋C₁，…，2π－φ_m＋C₈，…，C₁，…，C₁₂
7π/8	32-state square wave modulation	φ_m＋C₁，…，2π－φ_m＋C₁₀，…，C₁，…，C₁₆

Table 2. Threshold comparison under different modulation depths
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Table 2. Threshold comparison under different modulation depths
Modulation depth Four-state modulation threshold /[(°)·h^－1] Polymorphic modulation threshold /[(°)·h^－1]
π/2 0.453 0
2π/3 0.741 0
3π/4 0.340 0
4π/5 0.623 0
5π/6 0.539 0
7π/8 0.432 0

Table 3. Performance comparison of fiber optic gyroscope under different modulation depths

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Table 3. Performance comparison of fiber optic gyroscope under different modulation depths

Modulation depth	Four-state modulation		Polymorphic modulation
Modulation depth	Bias instability /[(°)·h^－1]	ARW/[(°)·h^－1/2]	Bias instability /[(°)·h^－1]	ARW/[(°)·h^－1/2]
π/2	0.0926	0.0034	0.0893	0.0031
2π/3	0.0758	0.0028	0.0701	0.0027
3π/4	0.0532	0.0025	0.0491	0.0021
4π/5	0.0478	0.0021	0.0429	0.0019
5π/6	0.0456	0.0018	0.0397	0.0015
7π/8	0.0416	0.0016	0.0365	0.0012

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Yanran Lü, Jiajun Ma, Yueruihan Huang, Qingyang Liu, Zipeng Zhang, Junbiao Jiang. Elimination of Crosstalk from Digital Closed-Loop Fiber Optic Gyroscopes via Polymorphic Modulation Method[J]. Chinese Journal of Lasers, 2022, 49(7): 0706003

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