Title: Combined modulating and demodulating method for inhibiting optic fiber gyroscope cross interference
Application Number: 200610113883 Application Date: 2006.10.20
Publication Number: 1945209 Publication Date: 2007.04.11
Approval Pub. Date: Granted Pub. Date:
International Classifi-cation: G01C19/72
Applicant(s) Name: Beijing Univ. of Aeronautics and Astronautics Address:
Inventor(s) Name: Zhang Chunxi;Xu Wenyuan;Wu Zhanjun;Zhang Xi;Li Lij
Attorney & Agent: zhouchang qi
Abstract:
    The combined modulating and demodulating method of simultaneously tracking 2pi voltage of optical fiber gyroscope and inhibiting cross interference automatically includes the following steps: powering on the system, generating 4 voltages of different states in the CPU, D/A converting, amplifying in the signal conditioning circuit and driving optical phase modulating in Y waveguide to obtain the phase difference between two light beams; A/D converting the real-time light power signal the photoelectric detector detects and outputting to the CPU; demodulating the light power signal and the 4 voltages in the CPU to obtain two sets of information of Sagnac phase difference in rotation state; and utilizing these signals separately for compensating the phase difference of the rotation of the optical fiber gyroscope and controlling the amplitude of the 2pi voltage to reach the real-time precise control on 2pi voltage.
Time: 8