Title: Measurement for eigenfrequency of interferometric type fiber-optic gyroscope by using asymmetrical square wave modulation method
Application Number: 200610144035 Application Date: 2006.11.24
Publication Number: 1967146 Publication Date: 2007.05.23
Approval Pub. Date: Granted Pub. Date:
International Classifi-cation: G01C19/72;G01P9/00;G01P21/00;G01H13/00;G01H17/00
Applicant(s) Name: Beijing University of Aeronautics Address:
Inventor(s) Name: Jin Jing;Lu Fengjian;Song Ningfang;Li Min;Tian Hai
Attorney & Agent: zhouchang qi
Abstract:
    The invention discloses an asymmetric square wave modulation method to measure interference fiber gyro eigenfrequency. By controlling module FPGA, the method controls DDS to generate different frequency asymmetric square wave to process phase modulation to Y waveguide; and the signal processing module DSP real-time calculates the margin absolute DeltPd of the accumulation in A/D sampling time T, and processes the absolute minimum judgment to the said margin absolute DeltPd, and when the margin absolute DeltPd close to zero, gets the fiber gyro eigenfrequency fe equaling modulation frequency fd. Such measurement method measures the eigenfrequency Fe with high accuracy, and frequency tracking speed adjustment quick, and highly real-time.
Time: 10