Frequency-modulated continuous-wave laser LiDAR is a robust optical technology for long-range three-dimensional distance and velocity measurement.However,inherent sweep chirp nonlinearity severely constrains distance ...Frequency-modulated continuous-wave laser LiDAR is a robust optical technology for long-range three-dimensional distance and velocity measurement.However,inherent sweep chirp nonlinearity severely constrains distance resolution and precision.Conventional compensation methods fail to address residual nonlinearity,particularly in rapid,long-range measurement,posing a critical bottleneck to practical applications.Herein,we present a high-order nonlinear solving model and fundamentally compensate for residual nonlinearity,which can improve precision by one to two orders of magnitude over traditional methods.It yields 19.58 μm precision over 25 m for a non-cooperative target without resolution loss,even under experimental conditions where the absolute distance is overwhelmed by noise using traditional methods.This method exhibits robustness across various laser types and achieves precision near the quantum noise limit.This study lays the groundwork for more precise frequency-sweeping coherent detection technologies.展开更多
基金National Natural Science Foundation of China(501100001809,62275068)Natural Science Foundation Joint Guidance Foundation of Heilongjiang Province(LH2022F027)Natural Scientific Research Innovation Foundation inharbin Institute of Technology(HIT.NSRIF202347).
文摘Frequency-modulated continuous-wave laser LiDAR is a robust optical technology for long-range three-dimensional distance and velocity measurement.However,inherent sweep chirp nonlinearity severely constrains distance resolution and precision.Conventional compensation methods fail to address residual nonlinearity,particularly in rapid,long-range measurement,posing a critical bottleneck to practical applications.Herein,we present a high-order nonlinear solving model and fundamentally compensate for residual nonlinearity,which can improve precision by one to two orders of magnitude over traditional methods.It yields 19.58 μm precision over 25 m for a non-cooperative target without resolution loss,even under experimental conditions where the absolute distance is overwhelmed by noise using traditional methods.This method exhibits robustness across various laser types and achieves precision near the quantum noise limit.This study lays the groundwork for more precise frequency-sweeping coherent detection technologies.
