Abstract:

In order to analyze the effect of temperature variation on the northfinding accuracy of the pendulous gyroscope, a mathematical model of the suspension tape of the pendulous gyro north finder affecting the northfinding accuracy with changes of temperature is established, and different simulation experiments under high and low temperature conditions are accomplished. Firstly, due to the formula of thermal expansion, the relationship between the coefficient of torsion of the suspension tape and temperature variation is obtained, thereby a mathematical model of the effect of temperature variation on the zero position correction coefficient is established. Then, under the premise that the torsion zero of the suspension tape does not change, the effect on north-finding accuracy of the gyroscope is analyzed in two cases of tracking and no-tracking. The simulation experiments indicate that, under the same temperature variation, the smaller the angle of torsion zero and the swing center is, the smaller the effect on accuracy is. When temperature variation is 60 ℃ and the angle is 30′, the effect is up to 15 ″ at most, and 5.3″ at least. Minimizing the angle of torsion zero and the swing center can effectively reduce the effect of temperature variation on accuracy.