Coherent Random-Modulated Continuous-Wave LiDAR Based on Phase-Coded Subcarrier Modulation

A coherent random-modulated continuous-wave (RMCW) LiDAR transmits a lightwave modulated by pseudo-random binary sequence (PRBS). The backscattered from targets is received and used to reconstruct the PRBS. Then, time-of-flight extracted correlating reconstructed PRBS original We propose RMCW based on phase-coded subcarrier modulation, in which impacts of internal reflection optical Doppler frequency shift (DFS) are mitigated. continuous amplitude-modulated an RF signal with Coherent detection receiver. beat that consisted low-frequency high-frequency obtained single balanced photodetector (BPD). DFS can be directly signal. It compensate for offset PRBS, In addition, background noise caused suppressed averaging over successive measurement spots. this paper, performance firstly analyzed numeric simulations demonstration experiments. line-scanning measurements moving implemented demonstrate 3D imaging capability proposed LiDAR.