Research On Key Technology Of Infrared Target Simulation System For Mars Silhouette

The infrared target simulation system is an important part of infrared semi-physical simulation.It has been widely used in the field of space exploration.With the improvement of the accuracy requirements of navigation sensors,high-precision infrared target simulation system is generated.and the high-precision ground calibration method is also an a key link to improve accuracy of navigation sensor testing.The infrared target simulation system verifies the identification and tracking test capabilities of the navigation sensor under laboratory conditions.The infrared target simulation system developed in this paper is to study the imaging of the spacecraft from the Earth to the Mars.The infrared target simulator is an important equipment,which verify the feasibility and navigation accuracy of the spacecraft navigation method.It introduces the research and analysis of the design method of infrared target simulator at the ground domestic and overseas.The overall design scheme and ground calibration method of the Mars contour infrared target simulation system are proposed.By the analysis of the overall system composition of the target simulator and the relationship between the various components,the overall design scheme and design indicators of the system are determined.In the optical design of simulated system,a long focal length and high imaging quality collimating optical system is designed.In the aspect of structural design,in order to ensure the calibration accuracy and simulation function of the static target simulation system,a design method of quickly drawing and inserting the reticle is adopted to achieve precise positioning.In the DMD-based dynamic simulator,in order to avoid interference between the concentrating system and the projection system structure,an infrared mirror holder that facilitates beam folding is skillfully designed.Finally,the assembly and calibration of the target simulation system is completed,and in view of the parallel adjustment of the optical axis of the static target simulation system is investigated and discussed in depth.A high-precision beam shifting system is introduced,and the accuracy of the system is analyzed.The detection aperture can be extended to 1200 mm.the calibration of the infrared target simulator is completed by adopting high-precision infrared calibration technology.Subsequently,Matlab programming is used to fit the spatial position information of the calibration point to the center coordinate and radius of the target arc segment,and systematic error analysis is performed for the entire calibration process.The total error of the system calibration is calculated to be 41.78?,which meets the calibration requirements.