The electromagnetic scattering characteristics of finite beams on typical surfaces and different sea conditions, the amplitude distribution and spectrum characteristics of scattered echoes on rough surfaces are studied. The related research results have been applied to the inverse scattering problem of rough surface reconstruction, and can also be used for the classification and remote sensing of rough surfaces, as well as the scattering analysis of ground-sea clutter. The near-field scattering characteristics of target laser in our seeker system are studied by combining the beam scattering from rough surface. Its research results have filled the gap in China and reached the international advanced level, which has been highly praised by domestic and foreign peer experts.
2. Modeling, calculation and application of composite electromagnetic scattering from offshore near-earth targets.
According to the geometric modeling and blanking technology of complex targets, electromagnetic scattering of rough surface beams, combined with field and laboratory measurements, the key technologies in electromagnetic scattering characteristics of complex targets and earth-sea background are studied and solved, and theoretical modeling and computer digital simulation are carried out. For example, tanks hidden in the jungle and other environments, cruise missiles flying at high speed near the ground, etc. Studying its electromagnetic scattering mechanism and analysis method has direct engineering practical application value for developing and accurately attacking enemy ground weapons and equipment targets and building China's missile defense system.
3. Study on the model of laser atmospheric transmission characteristics.
Based on the experimental and theoretical research at home and abroad, a modular model of laser transmission characteristics through the atmosphere, especially near-earth atmosphere and battlefield environment, and its corresponding calculation software are established.
4. Bistatic scattering of laser beam by diffuse target in atmospheric turbulence.
Based on the oblique transmission theory and the established atmospheric transmission characteristic model, the horizontal expansion is applied to the study of oblique transmission, and the variation law of scintillation index with oblique Rytov variance is analyzed. The bistatic scattering field and scattering intensity distribution of Gaussian beams by diffusion targets in turbulent atmosphere are studied.
5. Scattering of plane waves and Gaussian beams by spherical/cylindrical particles with large size parameters.
The recursive formula of electromagnetic scattering coefficient of large-scale parameter multilayer sphere/cylinder to plane wave and Gaussian beam and the numerical calculation method of stable convergence are proposed. The calculated particle size parameters are 3 ~ 4 orders of magnitude larger than those of foreign methods, which solves the light scattering problem of particles with large particle size parameters. The related results have important theoretical value and application prospect in the fields of electromagnetic scattering, electromagnetic measurement and spaceborne remote sensing.
6. The local variance accumulation method is proposed to estimate the fractal dimension of one-dimensional random fractal curve.
This method lays a foundation for the correct study of fractal scattering and is quoted by domestic fractal books.