ERROR ANALYSIS AND IMPROVED WAYS FOR FIBER OPTIC GYROSCOPE OUTPUT IN SHOCK, VIBRATION AND HALF CARDINALS MOVEMENT EXPERIMENTS

摘要

Large disturbance and instantaneous angular acceleration are introduced into fiber optic gyroscope (FOG) in the half cardinals movement, vibration and shock experiments. Non-linear factors will occur in the closed-loop of FOG when angular acceleration is great to a certain degree. The ability of tracking input for FOG reduces, which becomes more complicated as the result of the combined action of gain and delay which affect band-width of closed-loop. Therefore, it is very important for solving half cardinals movement, vibration and shock problem to analyze the closed-loop model of FOG and confirm suitable gain and time delay. Firstly, this paper established the correct closed-loop model and analyzed system stability and band-width under different gain and delay. Secondly, it simulated the vibration and shock experiments to analyze the ability of tracking input of FOG for different gain and delay when angular acceleration increases. The analysis and the simulation show that the output of FOG under half cardinals movement, vibration and shock experiments with poor tracking performances can be improved by decreasing time delay and setting up appropriate gain of closed-loop.