Laser echo detection technology based on G-APDs

Geiger mode avalanche photodiode arrays(G-APDs) is emerging high-sensitivity laser signal detectors in recent years, which can be applied to photon-level lidar detection, guidance and imaging. Because of its photon-level detection sensitivity, it is greatly affected by the strong skylight background and its own dark count. In order to reduce the noise interference such as dark count and strong skylight background, based on the detection techniques such as spectral filtering, spatial filtering and temporal filtering, a noise filtering technique based on neighboring pixel threshold detection is proposed. Through modeling analysis and related experiments, it is verified that the noise filtering technique based on neighboring pixel threshold detection can effectively improve the detection probability and ranging accuracy of laser single-pulse echo signals.