中国物理B ›› 2018, Vol. 27 ›› Issue (9): 94213-094213.doi: 10.1088/1674-1056/27/9/094213
• ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS • 上一篇 下一篇
Yi-Fei Sun(孙怿飞), Zi-Jing Zhang(张子静), Li-Yuan Zhao(赵丽媛), Wei-Min Sun(孙伟民), Yuan Zhao(赵远)
Yi-Fei Sun(孙怿飞)1, Zi-Jing Zhang(张子静)1, Li-Yuan Zhao(赵丽媛)2, Wei-Min Sun(孙伟民)2, Yuan Zhao(赵远)1
摘要:
Geiger mode avalanche photodiode detector (Gm-APD) possesses the ultra-high sensitivity. Photon counting chirped amplitude modulation (PCCAM) light detection and ranging (lidar) uses the counting results of the returned signal detected by Gm-APD to mix with the reference signal, which makes PCCAM lidar capable of realizing the ultra-high sensitivity, and this is very important for detecting the remote and weak signal. However, Gm-APD is a nonlinear device, different from traditional linear detectors. Due to the nonlinear response of Gm-APD, the counting results of the returned signal detected by Gm-APD are different from those of both the original modulation signal and the reference signal. This will affect the mixing effect and thus degrade the detection performance of PCCAM lidar. In this paper, we propose a response probability correction method. First, the response probability correction model is established on the basis of Gm-APD Poisson probability response model. Then, the response probability correction model is used to adjust the original modulation signal that is used to drive laser, in order to make the counting results of the returned signal detected by Gm-APD better mix with the local reference signal in the same form. Through this method, the detection performance of PCCAM lidar is enhanced efficiently.
中图分类号: (Remote sensing; LIDAR and adaptive systems)