Simulation Of Laser Radar 3D Range Imaging Of Target And Influencing Factor Analysis

Laser radar 3D imaging technology is helpful to obtain 3D volume and intensity information of object, and is especially suitable for identifying military ground vehicles under camouflage or foliage. This thesis discusses the laser radar 3D imaging technology from the viewpoints of radar equation, the influence of speckle on statistical detection, and the influence of turbulence on the imaging. The main works and results are as follows:1. Relationship is established between the received power with laser pulse, propagation factor, object shape, BRDF of material, field of view of detector, and optical efficiency. Influence of these factors on the image is analyzed.2. Influence of target speckle on the pixel size of detector and statistical detection is analyzed based on the theory of partial coherence imaging. Simulation model of 3D imaging of diffuse target is developed. The characteristic of speckle of arbitrary target is analyzed. Preliminary analysis of the effect of optical scattering on the subject speckle is performed. The influence of speckle on the range detection probability is also analyzed.3. Under the assumption of deterministic signal and noise model, the influence of threshold value and detector multiplication on the detection probability based on SNR is analyzed, providing standard for parameter choose for detector. Based on the range equation and quantum efficiency, the limitation of received photon level of array detector on the detection range is analyzed. Influence of pixel number on the lateral resolution of partial coherence imaging is discussed. A brief analysis of effects of turbulence on the optical transfer function of the imaging system is also given.