Integrated modeling method for infrared radiation characteristics of complex targets

Abstract

An integrated modeling method for infrared radiation characteristics of complex targets, based on the radiometric spectrum ray tracing method, considering the complex target surface's own infrared radiation, the bidirectional reflectance distribution function model, and the infrared radiation model of non-uniform exhaust gas; ray tracing The process adopts sampling the pixels of the focal plane of the detector to generate a ray beam, and calculates the intersection of each ray with the complex target in the scene; calculates the radiation reflection value for each intersection point, and calculates the radiance obtained by all the rays of the pixel Sampling and reconstruction to obtain the spectral radiance at the pixel of the detector; finally, integrate the required infrared spectrum to obtain the characteristic value of the target infrared radiation received by the detector. The present invention runs through the whole solution process with a spectral ray tracing method, and establishes a solution model applicable to the ray tracing form, which is suitable for simulating the infrared radiation characteristics of complex target aircraft including tail flames in a specific flight state.

Description

technical field [0001] The invention relates to an integrated modeling method of infrared radiation characteristics of a complex target, in particular to the calculation technology of molecular infrared radiation in a gas flow field after non-uniform combustion, and belongs to the research field of infrared radiation scattering characteristics of targets and environments. Background technique [0002] The infrared radiation characteristics of complex targets play an important role in the design of infrared stealth equipment, the verification of infrared detection algorithms, the hardware-in-the-loop simulation system of target infrared radiation, the design of infrared search and tracking systems, including the selection of bands and thresholds. Obtaining target infrared radiation characteristics technology is the basis for research on infrared equipment and algorithms. Usually there are two ways to obtain it, one is obtained through experimental measurement, and the other i...

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Problems solved by technology

In this paper, only the influence of the primary reflection of the environment is considered, and the effect of multiple reflections is not considered. The target surface is a Lambertian surface, and the radiation characteristics of the aircraft target exhaust are not included.

The "Scattering Characteristics of Infrared Radiation by Non-Lambertian Surface Objects to Complex Background" published by Yang Yufeng, Wu Zhensen, etc., was published in Vol.40, No.5 Infrared and Laser Engineering Journal in 2011. For the scattering characteristics of infrared radiation with complex backgrounds, although it uses BRDF surfaces, it does not include multiple reflection models, and the target tail flame radiation model, its calculation target is a cylinder

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