Research On Passive Millimeter-wave Scene Imaging Simulation Method Based On Fast Ray-tracing

As an efficient way to predict the performance of a passive millimeter-wave(PMMW)imaging sensors,scene simulation is a necessary work for the develop of this technology,and also attribute to research on the millimeter wave(mmW)radiation characteristic of different objects.Based on an advanced rapid ray tracing algorithm,this paper proposes a new method of the PMMW simulation for complex scene.As the recourse of PMMW,object's heat radiation model is essential for scene simulation.We introduce millimeter waves,discuss the media radiation model of smooth surfaces and rough surfaces,and analyze the millimeter-wave atmosphere radiation model.Secondly,to simulate the transmission path of the radiation,we illuminate the framework of PMMW scene simulation model based on ray-tracing,with consideration of the essential affecting factors such as polarization rotation during ray-tracing and antenna pattern smoothing of the imaging system.Furthermore,we propose a new method of mmW radiation calculation based on fast ray-tracing algorithm.This method can effectively eliminate most nonintersecting ray-triangle computation,and therefore the speed of scene imaging simulation process will be significantly improved.Finally,based on the scene simulation model,we establish a PMMW imaging simulation system.According to the simulation experiment,the timeliness of the system has been discussed.As the same time,the outdoor imaging experiment and scene imaging simulation are carried out to validate the presented method.Finally,some application scenes have been simulated and analyzed using this system,including aircraft fighter,marine target and armored target.