A Study of Theoretical Modeling on LRCS of Space Targets
- Paper number
IAC-11,A6,2,15,x9717
- Author
Mr. Gu Jun, State Key-Lab of Electromagnetic Environment Research, Shanghai,China, China
- Coauthor
Mr. Xiaobing Wang, China
- Year
2011
- Abstract
Researches on laser radar cross-section(LRCS) are of great value to applications in astronomy, aviation and meteorology. LRCS of a target is not only related to the geometrical shape, size and incident wave length,but relies directly on the statistical value of its surface roughness and the dielectric property of the surface material as well. In laser scattering analysis, a target is treated as a rough surface with finite permittivity. Not only mirror reflection component, to which the scattering centre contributes, is considered, but diffuse reflection component as well. Among many conceptions quantitively describing the target’s laser scattering characteristics, LRCS is an important index number including the overall contributions from various factors influencing the laser scattering characteristics, such as the laser wavelength, the dielectric property and roughness of the surface material, and the geometrical shape of the structure. Researchers over world have made efforts in this area. But most them either start from the electromagnetic scattering point of view to treat the problem as evaluating the target’s radar cross section in light frequency, or start from the radiation point of view to treat the whole target surface as a Lambert one. The former approach neglects the zero limit case of light wavelength, where the premise of the general electromagnetic scattering theory fails, resulting in a confined accuracy in laser scattering analysis, while the latter approach simply treating the target as a Lambert surface is coarse in accuracy too. In this paper, a space target is accurately modeled in laser scattering analysis by introducing the Bidirectional Reflectance Distribution Function(BRDF), which precisely describes the reflectance on the target surface as a distribution function varying with space angle in all directions. The method is superior to the previous ones in its appropriate theoretical modeling, and has wide application foregrounds in theoretical modeling and simulation of laser scattering target characteristics.
- Abstract document
- Manuscript document
(absent)