Imageing Modeling And Image Simulation Of Space-based Measurement Camera

Based on the imaging process of the space-based measuring camera,this paper builds mathematical models for the imaging process and finally accomplishes visualized graphic modeling for each function module and sets up the graphic simulation system which is based on the ray tracing and the transfer function effects,and also realizes the image simulation function preliminary.According to the analysis of actual imaging process,the whole simulation process is divided into two parts,the geometrical image simulation and the physical image simulation.In the geometrical image simulation part,firstly,we analyze the imaging principles of central projection imaging model;then,based on the analysis of the representing methods of target data,we design the ideal geometrical imaging algorithm which is based on the ray tracing;and finally,we build an image positioning model based on the coordinates transformation of space-based measuring.In the physical image simulation part,we firstly state the basic principles of image simulation which uses transfer function method,then study the MTF models of spatial filtering effect for each part of imaging process and mainly analyze the influence on imaging results when the parameters of each model change.Finally,based on the Simulink and the analysis of both coordinate transformation model and the data flow of MTF model,we realize the model building for each module and accomplish the designing of IO port and parameters’ setting up.Based on the developed model libraries,we build the imaging systems for space-based measuring camera to image the space targets and Earth background respectively.By simulations experiment,we verify the correctness of the imaging model.On the one hand,the image simulation system built in this paper can provide the analysis tool for sensor’s parameter designing.On the other hand,it can provide the image data signal source for the larger-scale Simulink simulation system.The simulated imagines can be used as data source for verifying the correctness of related image processing algorithm.