Digital compensation technology for thermal induced nonreciprocity in coil of fiber-optic gyroscopes

摘要

Based on the characteristic of thermal induced nonreciprocity in coil of fiber optic gyroscope (FOG) and the heat-conduction model, a simple and universal model was worked out. It is a low-pass and time delay response to temperature. The model was digitized with a digital smooth filter process and a time delay process and the experimental study was done with an open-loop FOG. The bias drift due to temperature was reduced to 18.2% of that before compensation.