Systems and methods for thermal gradient compensation for ring laser gyroscopes

摘要

Systems and methods for thermal gradient compensation for ring laser gyroscopes are provided. In one embodiment, a method for producing bias compensated angular rate measurements from a ring laser gyroscope comprises: sampling an angle measurement output from a laser block sensor to obtain an angular rate measurement; obtaining an laser block temperature measurement (Tblock) for the laser block sensor; obtaining a temperature gradient measurement (Tdiff) for at least one gradient line across a portion of the laser block sensor; calculating a rate bias error by applying parameters produced from the temperature measurement (Tblock) and the temperature gradient measurement (Tdiff) to a thermal gradient compensation model, wherein the thermal gradient compensation model includes at least one coefficient corresponding to the temperature gradient measurement (Tdiff); and calculating a difference between the angle rate measurement and the rate bias error to produce a bias compensated angular rate measurement.

主权项

1. A method for producing bias compensated angular rate measurements from a ring laser gyroscope, the method comprising:
sampling an angle measurement output from a laser block sensor to obtain an angular rate measurement; obtaining an laser block temperature measurement (Tblock) for the laser block sensor; obtaining a temperature gradient measurement (Tdiff) for at least one gradient line across a portion of the laser block sensor; calculating a rate bias error using a processor by applying parameters produced from the temperature measurement (Tblock) and the temperature gradient measurement (Tdiff)to a thermal gradient compensation model, wherein the thermal gradient compensation model includes at least one coefficient corresponding to the temperature gradient measurement (Tdiff); and calculating a difference between the angle rate measurement and the rate bias error using a processor to produce a bias compensated angular rate measurement;wherein the thermal gradient compensation model includes at least:
a first coefficient K1 corresponding to an offset; a second coefficient K2 corresponding to the laser block temperature measurement, Tblock; a third coefficient K3 corresponding to Tblock2; a fourth coefficient K4 corresponding to a time derivative, dTblock/dt; a fifth coefficient K5 corresponding to the product of Tblock×(dTblock/dt); a sixth coefficient K6corresponding to the temperature gradient measurement (Tdiff); and wherein the rate bias error =f(K1, K2×Tblock, K3×Tblock2, K4×(dTblock/dt), K5×Tblock×(dTblock/dt), K6×Tdiff).