A study on simulation method of starlight transmission in hypersonic conditions

By taking a hypersonic vehicle as the research object, the simulation method of starlight transmission in hypersonic conditions is established to qualitatively and quantitatively research the platform aero-optical effects on starlight navigation, and to provide a theoretical basis for the extended application of the starlight autonomous navigation. At first, based on Reynolds average, the k-ω/SST two-equation turbulence model is used to calculate the density distribution of external flow field when the star sensor is installed at different locations in the vehicle (head, middle and tail), and then the spatial refractive index distribution of the flow field is obtained. On this basis, we use the geometrical optics method and physical optics method to calculate the optical path difference, the point spread function, the image offset and such optical transmission effects caused by the laminar flow field, and then obtain a laminar flow diagram to lower clarity. At the mean time, we calculate wavefront distortion, density, standard deviation, variance and other optical phase-transfer effects of turbulent flow field by using statistical theory optical, and obtain a turbulent flow diagram to lower clarity.