Biaxial Signal Decoupling Method for the Longitudinal Magnetic-Field-Modulated Spin-Exchange-Relaxation-Free Comagnetometer in Inertial Rotation Measurement

We propose a practical biaxial signal decoupling method for the longitudinal magnetic-field-modulated spin-exchange-relaxation-free comagnetometer used in the inertial rotation measurement. The method is implemented based on a model, which had been verified by a rotation response experiment. According to our model, by adjusting the magnetic field in the pumping direction to the decoupling point, the modulated comagnetometer can independently output the rotation information of two orthogonal directions. The rotational scale factor also reaches the maximum value, and the rotation sensitivity and long-term stability can be further improved. Our method not only retains the advantages of the modulated comagnetometer that it can output the dual-axis signal simultaneously with only one probe beam, but also realizes biaxial signal decoupling, and achieves better practical performance.