Abstract
The analysis of radar target electromagnetic scattering characteristics is the basis of radar target detection, imaging and recognition. The high-frequency algorithm shooting and bouncing ray (SBR) method is used to calculate the radar cross section (RCS) of the plasma-covered target. Firstly, the RCS of the single-layer and multi-layer uniform plasma-covered cylinders was calculated and compared with multilevel fast multipole algorithm (MLFMA) to prove the correctness of the program. The effects of different incident conditions and different plasma parameters on RCS reduction were then investigated by calculating the RCS of the uniform and non-uniform plasma-covered RAM-CII vehicle model. This research is of great significance for the study of the “black obstacle” phenomenon that occurs when the vehicle is flying at high speed in space.
Highlights
When the hypersonic vehicle re-enters the atmosphere, due to the high temperature ionization and ablation, a plasma flow field around the vehicle is formed, that is, a plasma sheath
Studying the transmission characteristics of electromagnetic waves in the plasma sheath around the vehicle can effectively estimate the attenuation degree of the plasma to the communication carrier signal, and predict the height and time of the communication interruption, which is of great significance for solving the problem of vehicle communication interruption
We found that the thickness of the covered plasma has a great influence on the reduction of radar cross section (RCS)
Summary
When the hypersonic vehicle re-enters the atmosphere, due to the high temperature ionization and ablation, a plasma flow field around the vehicle is formed, that is, a plasma sheath. Studying the transmission characteristics of electromagnetic waves in the plasma sheath around the vehicle can effectively estimate the attenuation degree of the plasma to the communication carrier signal, and predict the height and time of the communication interruption, which is of great significance for solving the problem of vehicle communication interruption. With the target size increasing, FDTD cannot meet the calculation requirements, so the high-frequency algorithm shooting and bouncing ray method (SBR) is adopted, which has fast speed and small required memory. This algorithm is of great significance for analyzing the electromagnetic scattering characteristics of super-large targets
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