With the rapid development of new photoelectric detection technology and precision guided weapons, the importance of stealth technology in modern warfare is increasing day by day. The current detection technology is mainly based on visible light detection, infrared detection and radar detection. The stealth capability will gradually expand to the ultra-wide spectrum of the merger of infrared and radar. In this paper, the photonic crystal structure is optimized based on the "band gap" principle of the photonic crystal and the characteristics of related materials. At the same time, it is laminated and combined with the wave-absorbing materials in the radar band in order to achieve impedance matching and realize the multi-spectral selective stealth in the visible light/infrared/radar band. This technology can achieve stealth effect in both wide spectrum and narrow band. It can be applied to prevent ground equipment, military aircraft and other military equipment from being detected by visible light/infrared/radar and laser, and effectively enhance its battlefield survivability.
High-power laser transmission is affected by aerosol scattering in the atmosphere, beam quality, beam jitter and other factors, which cause a certain power attenuation during atmospheric transmission. In this paper, a laser atmospheric transmission model is established. Qualitative and quantitative analysis methods are used for simulation evaluation. The power density of the wavelength of 1 micron laser to the target is calculated, and the damage effect on different materials is also simulated. It provides a theoretical basis for the space transmission and application of high power lasers.
In order to deeply explore the plasma stealth performance of hypersonic vehicle, the WKB method is implemented to numerically simulate and analyze the attenuation of the incident electromagnetic wave. Specifically, the relevance between (a) the absorption efficiency and attenuation of the electromagnetic, and (b) the electron density of the plasma, the thickness of the plasma layer, the collision frequency of the plasma and the frequency of the incident electromagnetic wave, under the condition that the electromagnetic wave (in the L, S, C and X bands of the detection radar) is input into the plasma thin plate in a confined space, is systematically studied. The result shows that, in a confined space, the maximum effect of the absorption efficiency and attenuation of electromagnetic can be achieved by an optimal combination of plasma electron density and plasma layer thickness, having guiding significance on development of plasma generator in the confined space and stealth technology of hypersonic vehicle.
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