In the process of target re-entry, since the target enters the atmosphere at a high speed, the violent friction between the target and the atmosphere generates aerodynamic heat, which makes the target surface heat up rapidly and generates a strong radiation signal. It is an important factor in the target detection process. In order to calculate the surface temperature caused by the aerothermal effect quickly, a rapid prediction model of temperature characteristics is proposed in this paper. Based on the temperature of stagnation point and the surface temperature distribution obtained by the summary analysis with accurate simulation calculation, The surface temperature distribution characteristics during the target re-entry process can be estimated quickly.
Photon is an ideal carrier of quantum information, which can carry spin angular momentum and orbital angular momentum. In recent years, orbital angular momentum has shown great application prospects in quantum communication, quantum radar and other fields. It has gradually become a research hotspot in the field of detection. It is necessary to calibrate and measure the orbital angular momentum before it is applied to the detection field. Based on the interference principle and aperture diffraction theory, the measurement of orbital angular momentum is realized indirectly, and the experimental platform is built to verify part of the simulation results. It provides technical support for the subsequent implementation of quantum detection technology.
In order to study the transmission characteristics of orbital angular momentum in the atmosphere, MATLAB software is used to simulate it. The power spectrum inversion method and subharmonic compensation theory are used to construct a random phase screen to simulate the atmospheric turbulence effect. The effects of different topological charges, turbulence intensity and transmission distance on the orbital angular momentum intensity, phase and spiral spectrum distribution are studied. It provides support for the new quantum detection technology.
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