High-Precision In Situ Control of Transverse Magnetic Field in ASGs Based on High-Frequency Modulation and Transient Response

The coupling between the transverse magnetic field and the angular velocity in atomic spin gyroscopes (ASGs) makes it difficult to achieve high-precision in situ closed-loop control, which seriously affects the long-term stability of the gyroscopes. This article innovatively proposes a transverse magnetic field closed-loop control method based on high-frequency modulation and transient response. A steady-state response model for the electron spin–nuclear spin coupling ensemble based on high-frequency modulation is established, enabling high-precision in situ measurement of the transverse magnetic field. A method for decoupling the transverse magnetic field and angular velocity based on transient response is proposed. Based on the above, a transverse magnetic field closed-loop control scheme is designed, achieving high-precision in situ closed-loop control in the ASGs for the first time. Experimental results demonstrate that the sensitivities of in situ transverse magnetic field measurements reach 50 and 110 fT/Hz$\mathbf {^{1/2}}$, respectively. The inertial sensitivity of the ASGs is improved by 23.8$\%$to$\mathbf {6.30 \times {10^{ - 6}}}^{\circ }$/s/Hz$\mathbf {^{1/2}}$, and the bias instability is reduced by 31.3$\%$to$\mathbf {9.04 \times {10^{-3}}}^{\circ }$/h. This approach is of great significance for improving the anti-interference capability of ASGs and broadening their application range.