Dual-sweep high-precision FMCW ranging based on distance spectrum reconstruction

This study aims to enhance the measurement accuracy of a dual-sweep frequency modulated continuous wave (FMCW) system used for Doppler compensation for non-cooperative targets in vibration environments. A distance spectrum reconstruction algorithm was developed to improve the ranging accuracy of the dual-sweep FMCW system, and its feasibility was validated through simulation and experimental data. Experiments yielded a standard deviation of 12.12 µm for a measured distance of about 10 m. The proposed method effectively mitigates the colored noise introduced by multiplication without increasing hardware complexity, thereby enhancing measurement accuracy. Thus, the proposed method can provide excellent outcomes in long-distance measurements of non-cooperative targets using FMCW ranging systems.