星载太赫兹高频段大气背景辐射特性研究

doi:10.12305/j.issn.1001-506X.2022.10.02

Abstract

Abstract:

The range of 7~10 THz is adjacent to infrared, which has unique advantages in the domain of space situational awareness and target detection. Based on the principle of radiation transmission, the characteristics of atmospheric background radiation are studied in this paper. The high terahertz band of the atmospheric radiative transfer simulation (ARTS) is extended by using high-resolution transmission molecular absorption database (HITRAN). Combined with European center for medium-range weather forecasting reanalysis-interim (ERA-interim), the atmospheric transmittance at ocean and desert in winter and summer is simulated. The single frequency of window and absorption band is selected to simulate the monthly mean and single day brightness temperature of global atmospheric background, and analyze the sensitivity of temperature and water vapor. The results show that compared with the window band, the background brightness temperature of the absorption band is lower and more stable, which can be used as a band selection for space target detection. The main contribution of background brightness temperature in window band comes from 0-10 km height of troposphere with rapid temperature and water vapor changes, while the absorption band comes from 15-30 km height of stratosphere with stable temperature and humidity, which is an important reason for the difference of atmospheric background brightness temperature.

Key words: high terahertz band, space target detection, characteristics of atmospheric background, atmospheric transmittance, sensitivity

CLC Number:

TN011

Tao JIN, Di ZHU, Jieying HE, Wenyu WANG. Study on the characteristics of high terahertz band atmospheric background radiation observed from satellites[J]. Systems Engineering and Electronics, 2022, 44(10): 3003-3011.

Figures/Tables 12

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Study on the characteristics of high terahertz band atmospheric background radiation observed from satellites

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