Patent ID: 6538745
Filing Date: 2003-03-25
Classification: G01C

Abstract:
A method for processing signals with frequencies fL and fR from a multioscillator ring laser gyro, the difference f&Dgr;&thgr;, of fL and fR being the angular rotation measure of the ring laser gyro, the sum fF of fL and fR divided by 2 being the Faraday bias frequency, fLP, fRP, fFP, and f&Dgr;&thgr;P being the values of fL, fR, fF, and f&Dgr;&thgr; for the present time interval, the method comprising the following steps repeated at regular time intervals:(a) determining two or more of the values MLP, MRP, MFP, and M&Dgr;&thgr;P of a set of functions ML(fL), MR(fR), MF(fF), and M&Dgr;&thgr;(f&Dgr;&thgr;), ML(fL), MR(fR), MF(fF), and M&Dgr;&thgr;(f&Dgr;&thgr;) being functions respectively of fL, fR, fF, and f&Dgr;&thgr;; (b) storing two or more processed values MLS, MRS, MFS, and M&Dgr;&thgr;S of the functions ML(fL), MR(fR), MF(fF), and M&Dgr;&thgr;(f&Dgr;&thgr;) if the corresponding values of MLP, MRP, MFP, and M&Dgr;&thgr;P are valid, a processed value being derived from the value for the present time interval and zero or more processed values for prior time intervals. (c) determining f&Dgr;&thgr;P or a function thereof from zero or more valid function values obtained as a result of executing step (a) during the current time interval, zero or more processed values obtained as a result of executing step (b) during a prior time interval, and zero or more extrapolated values obtained by extrapolating the processed values obtained as a result of executing step (b) during a prior time interval to the present time interval.