Study on the magnetic sensitivity of four frequency differential ring laser gyro

The magnetic-induced drift is an important error to limit the precision of four frequency differential ring laser gyro (DILAG) in navigation application. Different from the traditional magnetic shielding technology, this paper introduces a new method to decrease the magnetic sensitivity of DILAG, simply by adjusting the frequency stabilization mode. Firstly, the physics principle of the method is illustrated. Then, the concrete steps for implementing are given in detail, including the hardware structure and the software flow. Finally, repeatable experiments are carried out and the results verify the validity of the method, which may be helpful to researchers.