In this research, a polymorphic modulation method is proposed to suppress crosstalk by establishing a general formula adapted to different modulation depths; the optimal modulation method is determined by different modulation depths to eliminate the dead zone. According to the National Military test standard, the performance tests of the four-state and polymorphic modulations are carried out under modulation depths of π/2, 2π/3, 3π/4, 4π/5, 5π/6, and 7π/8. The dead zone thresholds corresponding to these depths are about 0.453, 0.741, 0.340, 0.623, 0.539, and 0.432 (°)/h. The zero offset stability corresponding to the use of polymorphism modulation is 0.0893, 0.0701, 0.0491, 0.0429, 0.0397, and 0.0365 (°)/
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