The laser stealth of space target is useful, important and urgent in practice. This paper introduces the definition expression of laser radar cross section (LRCS) and the general laws of the influencing factors of space target’s LRCS, including surface materials types, target’s shape and size. Then this paper discusses the possible laser stealth methods of space target in practical applications from the two view points of material stealth methods and shape stealth methods. These conclusions and suggestions can provide references for the next research thinking and methods of the target’s laser stealth.
This paper adopts the High Level Architecture to develop the space-based laser active imaging distribution simulation software system, and designs the system framework which contains three-step workflow including modeling, experimental and analysis. The paper puts forward the general needs of the simulation system first, then builds the simulation system architecture based on HLA and constructs 7 simulation federal members. The simulation system has the primary functions of space target scattering characteristic analysis, imaging simulation, image processing and target recognition, and system performance analysis and so on, and can support the whole simulation process. The results show that the distribution simulation system can meet the technical requirements of the space-based laser imaging simulation.
Imaging simulation is desired to provide reference for the design and optimization of active detection system and to
expand the amount of training data for image processing and target identification algorithms. However it is difficult to
model and simulate the real image effect well and perfectly. Our own idea and feasible simulation method are put forward, and the content includes system performance model, space object characteristic analysis and imaging simulating. The system performance is analyzed first, and by using BRDF for describing target reflectance, the simulation model fidelity is improved. Then the flow of simulating active illumination imaging effects process is described and the illuminated target images of different attitude parameters are generated. It has been proven that the method of simulation is rational and efficient.
Studying the space-based optical surveillance system and target identification algorithm utilizing simulation technology
has been one of the hottest problems currently. The simulation principle and method of space object visible images
which can embody the range and system performance of actual space-based optical surveillance systems based on STK and OpenGL is put forward. The target reflection radiation model, as well as the relationship between OpenGL imaging model and the pinhole imaging model of real imaging system, are both researched. Imaging simulation process includes 3D target modeling, orbital analysis based on STK, imaging simulation based on OpenGL, noise and blur effects modeling. At last the serial visible images of moving space object are simulated. It can provide data base for the research of space-based target identification technology.
The modeling and simulation of target laser scattering characteristic is one of the most important parts of the research of
space object optical characteristics, and also is the basement of the design of active detecting system. LRCS is the
integrated description of target laser scattering characteristic. In this paper, the BRDF model of space object surface
materials, which is compatible with the active detecting geometry, is analyzed and selected, then a visualization method
of calculating the LRCS based on OpenGL is put forward. Two 3D space object models composed of different materials
are built and the LRCS values at different attitude angles and solar panel rotating angles are calculated. This method can
increase the reliability and fidelity of the estimation of target LRCS. The maximum rang of active detecting system is
also analyzed based on the estimation of LRCS. These research results of the LRCS can provide reference and
foundation for the design of active detecting system.