Radiation characteristics and detection capability model and analysis of small target in infrared radiation system

The target infrared radiation brightness is a key index for the infrared radiation system to obtain target characteristics and recognize the target. This paper proposes a calculation method to accurately evaluate the detection capability of the infrared radiation system and establishes the calibration calculation model of the infrared radiation system using multiple integration times. The calculation function of the target radiation brightness is constructed according to the principle that the total energy of the target in the infrared detector diffusion imaging is constant, and considering the factors such as atmospheric jitter, optical system diffraction and imaging aberration. Based on this, combined with the dispersion phenomenon of the test environment, the calculation model of the detection distance of the system is deduced. Based on the test platform with known parameters, the correlation between the detection distance and the target radiation brightness and the rationality of the detection distance calculation model established in this paper are calculated and analyzed. The obtained results provide a reference for the reliable detection of the infrared system under the condition of long-range in complex environments.