Good static and dynamics 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 dynamics 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 dynamics environment and static experiment results of the two schemes were compared. It shows that the triple eigen frequency signal detection scheme improved the dynamics environment adaptability of the HPFOG effectively, and the static performance is not infected. This can satisfy the application needs.
Wu Zhanjun, Zhang Xi, Wang Xiaxiao, Li Chen.Broad bandwidth signal detection scheme for high precision fiber optic gyroscope[J] JOURNAL OF BEIJING UNIVERSITY OF AERONAUTICS AND A, 2006,V32(11): 1365-1368
Pavlath G. Closed-loop fiber optic gyros Udd E, Lefevre H, Hotate K. Fiber Optic Gyros:20th Anniversary Conference. Denver, USA:SPIE, 1996:46-60
�Ŵ���,������. ����DSP��ȫ���ֱջ���������[J]. �������պ����ѧѧ��, 1998, 24(6):695-698 Zhang Chunxi, Song Ningfang. All digital DSP based closed-loop fiber optic gyroscope[J]. Journal of Beijing University of Aeronautics and Astronautics, 1998,24(6):695-698(in Chinese)
����. ���ֱջ��������ݻ�·���������о� .����:�������պ����ѧ�ѧԺ, 2004 Wang Yan. Research on control characteristics of digital closed-loop FOG . Beijing:School of Astronautics, Beijing University of Aeronautics and Astronautics,2004(in Chinese)
Lefevre H. The fiber-optic gyroscope[M]. Norwood, USA:Artech House, 1993:24-25
Lefevre H, Bergh R, Shaw H. All-single-mode fiber-optic gyroscope with long-term stability[J].Optics Letters.1981, 6:502-504