Abstract:

In order to improve the northfinding accuracy of gyrotheodolite, based on the principle of photoelectric integration, a mathematical model of influence of lateral deviation on north-finding accuracy is established, and simulation experiments are accomplished. Firstly, with the Euler’s dynamic equation the influence models of lateral deviation on gyroscopic precession and drifting respectively are established. Then, the influence of lateral deviation on the swing center and the zero position correction angle is analyzed respectively according to the principle of photoelectric integration. Finally, simulation experiments are conducted. Simulation results indicate that the larger the orientation angle corresponding with torsion zero of the suspension tape and the lateral deviation, the greater the influence on north-finding accuracy. Therefore, maximizing technology accuracy as well as minimizing the orientation angle and establishing the compensation mechanisms can effectively reduce the influence of system error on north-finding accuracy.