The thermal environment is an important factor in the design of optical systems. This study\ninvestigated the thermal analysis technology of optical systems for navigation guidance and control\nin supersonic aircraft by developing empirical equations for the front temperature gradient and\nrear thermal diffusion distance, and for basic factors such as flying parameters and the structure\nof the optical system. Finite element analysis (FEA) was used to study the relationship between\nflying and front dome parameters and the system temperature field. Systematic deduction was then\nconducted based on the effects of the temperature field on the physical geometry and ray tracing\nperformance of the front dome and rear optical lenses, by deriving the relational expressions between\nthe system temperature field and the spot size and positioning precision of the rear optical lens.\nThe optical systems used for navigation guidance and control in supersonic aircraft when the flight\nspeed is in the range of 1ââ?¬â??5 Ma were analysed using the derived equations. Using this new method\nit was possible to control the precision within 10% when considering the light spot received by the\nfour-quadrant detector, and computation time was reduced compared with the traditional method\nof separately analysing the temperature field of the front dome and rear optical lens using FEA.\nThus, the method can effectively increase the efficiency of parameter analysis and computation in\nan airborne optical system, facilitating the systematic, effective and integrated thermal analysis of\nairborne optical systems for navigation guidance and control.
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