Detection of Loran C signals based on the Rydberg Cs atomic system

We propose a highly sensitive detection method for Loran-C signals based on a Rydberg cesium atomic system. By exploiting the strong electric-field response of Rydberg atoms and the Electromagnetically induced transparency (EIT) effect, we theoretically achieve non-invasive, high-precision detection of low-frequency electromagnetic signals from the Loran-C navigation system. The core of this work focuses on real-time alternating electric-field signal simulation using Rydberg atoms. We systematically investigate the AC-Stark effect on the ground state 6S_1/2, intermediate state 6P_3/2, and Rydberg state 52D_5/2, and find that the energy shift of the Rydberg state is significantly larger than those of the ground and intermediate states. Building on this, we further examine the influence of the Rabi frequencies of the coupling and probe lasers on the signal strength, demonstrating that an optimal signal intensity can be obtained by appropriately setting these Rabi frequencies. Our results confirm that the Rydberg-atom-based real-time AC-field signal simulation technology offers high sensitivity, excellent real-time performance, and high precision. This study provides both theoretical support and practical insight for the application of Rydberg atoms in real-time alternating electric-field signal simulation, laying a foundation for technological advances and practical implementations in related fields.