Integrated modeling method for infrared radiation characteristic of complicated target

Abstract

The invention discloses an integrated modeling method for an infrared radiation characteristic of a complicated target. A bidirectional reflection distribution function model of infrared radiation on the surface of the complicated target and an infrared radiation model of non-uniform tail flame gas are considered based on a radiometry spectral ray tracking method; in a ray tracking process, the pixel on the focal plane of a detector is sampled, thus generating ray bundles, and an intersection between each ray and the complicated target in a scene is calculated; a radiation reflection value of each intersection is calculated, and the radiation brightness obtained by all the rays of the pixel is subjected to sampling and reconstruction, thus obtaining the radiation brightness with a spectral form at the pixel of the detector; finally, a required infrared spectrum band is integrated, thus obtaining a target infrared radiation characteristic value received by the detector. According to the integrated modeling method, the spectral ray tracking method runs through the whole solving process, and a solving model suitable for a ray tracking form is constructed, so that the integrated modeling method is suitable for infrared radiation characteristic simulation of a tail-flame-containing complicated target aircraft under a specific flying 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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