Broad bandwidth signal detection scheme for high precision fiber optic gyroscope

Good static and dynamic environment performance of the signal detection scheme is necessary to meet the practice application of the high precision fiber optic gyroscope (HPFOG). All-digital closed-loop signal detection procedure of HPFOG was analyzed. Closed-loop transfer function of the detection system was derived. The general eigen frequency modulation caused the long sample period and low bandwidth. The feedback can not null high frequency noise signal caused by the dynamic environment. The closed-loop system was destroyed, and unacceptable dynamic error was caused. The signal detection scheme based on triple eigen frequency modulation/demodulation was designed. The sample period was 1/3 that of the eigen frequency modulation, and the system bandwidth was increased effectively. The dynamic environment and static experiment results of the two schemes were compared. It shows that the triple eigen frequency signal detection scheme improved the dynamic environment adaptability of the HPFOG effectively, and the static performance is not infected. This can satisfy the application needs.