| Single-photon LiDAR, leveraging its advantage in weak light detection, is widely applied in scenarios such as target detection, and earth resource mapping. However, the current technology is limited by the need for prolonged accumulation to accurately invert target signal flux and depth. A high-flux high-repetition-rate single-photon LiDAR system is designed, and a waveform correction method suitable for such a system is proposed, to achieve fast and high-accuracy detection. This method addresses the issues of multi-period coupling and waveform distortion caused by the dead time of single-photon detectors under high-flux, high-repetition-rate conditions, thereby improving the system""s accuracy for target signal flux and depth. Focusing on the parameters of the designed high-repetition-rate, high-flux single-photon LiDAR system (dead time of 1200 ns, laser repetition frequency of 3 MHz), this paper conducts simulations and experiments with a single-point acquisition time of 1 ms. Simulation results demonstrate that the proposed method achieves the distance accuracy of 4.9 mm and the signal flux accuracy of 0.16 photons. Three-dimensional imaging experiments show that, using a 50×50 point-by-point scanning method, the imaging plane fitting accuracy reaches 8 mm, enabling clear and high-precision 3D imaging of small drones at close range. |
