Research on the method of detecting high-speed moving target with single-source dual-frequency laser coherence

This paper presents a method of detecting high-speed moving targets with single light source and dual frequency laser coherence.Due to the influence of cutoff response frequency of detector, the dynamic range of velocity measurement in traditional single-frequency coherent detection system is limited, and the velocity measurement of high-speed moving target cannot be realized. In this paper, six signal components are generated by four-light coherent mixing, one of which is the difference between the fixed frequency shift and the doppler frequency shift. The simulation verifies the feasibility of the method proposed in this paper, which has the characteristics of small data collection, large dynamic range, high precision and good real-time performance of the system, and improves the theoretical guidance of the method for further high-speed target detection research.