Development Of Digital Imaging Simulation Source For Space Target Navigation Camera

Before the development of visual navigation system for space target,it is necessary to take a simulation examination on the ground for the navigation camera.The imaging data source of space target navigation camera can provide images as input for this.Since the actual observation image is difficult to obtain,this paper develops a digital imaging simulation source for space target navigation camera with the use of computer image technology,which can obtains the observation image of space target through the simulation method.Starting from the application scene of space target imaging simulation,this paper has carried out in-depth research on the design of digital imaging simulation source which can simulate the observation image of space target generated by navigation camera.Based on ray tracing method,the navigation scene is built and the imaging process is designed.The integrated modeling of the target in both geometric and optical aspects is carried out.Finally,the digital imaging software is developed based on QT framework and Optix engine.Our work can be mainly organized as follow:First of all,we starts from the modeling of space target navigation scene,which lays the foundation for imaging simulation.Based on the ray-tracing method,we established a geometric imaging model of space target to locate it accurately,and then established a radiation imaging model of space target to quantitatively analyze the illumination in the scene.Finally,according to these two imaging model,the calculation method of space target imaging simulation is designed.Secondly,the modeling of optical characteristics of space targets is studied.An integrated modeling method of geometric and material optical characteristics of spatial objects is proposed.For the geometric appearance features,we describes the modeling ideas of component segmentation modeling,triangulation,triangulation mesh output.For the optical characteristics of materials,some optical models of materials are investigated for diffuse and specular surfaces,and their advantages and disadvantages and parameter selection are discussed.Then,based on the Optix engine,the imaging simulation module is completed.As is the core calculation module of the digital imaging analog source that we developed,the module,its overall scheme is described,and the core CUDA program and CPU program is designed.Finally,the imaging simulation module is tested to verify the correctness of the imaging results.Finally,the imaging simulation module is integrated and the digital analog source of space target navigation camera is developed.We designs the software of the digital imaging analog source,and then elaborates the design of the data communication module,system control module,data management module and other functional modules of the imaging analog source.Tests of the simulation quality and speed are token on the imaging analog source to verify that it can give a real-time image as improvement in the process of the simulation test on the ground.