Calculation of Optical Cross Section Areas of Spatial Objects Based on OpenGL Picking Technique

Cross-Scale Light Absorption Properties of Surface Bionic Microstructures for Spacecraft Stealth

“…The OCS of a space target is only related to the surface properties, geometric structure and size of the target, as well as to the sun vector and the observation vector, and the relationship of each is shown in Figure 1. The OCS can be calculated as Equation (1) [13]:…”

“…a > 0 is used to adjust the intensity of the Fresnel phenomenon, and b > 0 is used to adjust the rate of increase or decrease of the specular component. The above model parameters for commonly used spacecraft surface materials [13] are shown in Table 1. Combining Equations ( 1) and ( 2), the overall optical cross-sectional area S ocs of the spacecraft can be calculated.…”

“…The coordinate system XYZ shown in Figure 13a is established on the standard body, where OS in the figure is the light source vector, OD is the observation vector, the angle between OS and the y axis is η, the projection of OS on the XOZ plane coincides with the z axis, the angle between OD and the y axis is γ and the angle between the projection of OD on the XOZ plane and the z axis is β. If the hemispherical reflectance of the Lambertian cylinder is ρ 2π , then its BRDF is ρ 2π /π, and if the radius of the bottom surface of the cylinder is R, the height is L, and the standard solar irradiance is E sun , so the OCS expression of the Lambertian cylinder is [13]: It can be seen from Figure 14a that the two algorithms are basically consisten seen from Figure 14b, the difference between the OCS based on graphic blanking an theoretical value is no more than 0.10%. The results show that the algorithm is eff and has high accuracy.…”