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Guo B.,Xidian University | Wang X.,Xidian University | Jin W.,No 63870 Unit Of Pla | Wang X.,No 63870 Unit Of Pla | Huang X.,Xidian University
Xi'an Dianzi Keji Daxue Xuebao/Journal of Xidian University | Year: 2014

The strong radiation source (such as battlefield fire) has become an important factor affecting the infrared imaging quality. First, a feature quantitative model of infrared imaging under strong radiation source disturbance is built based on the imaging signal conversion mechanism and by simultaneously considering the signal response characteristic, dynamic range, automatic gain characteristic (AGC) and gray level quantization and display. Then, a simulation of the output image of the infrared imaging system is performed on the basis of the model mentioned above and the simulation platform developed in our laboratory. Finally, a quantitative analysis of the relationship between the energy of the strong radiation source and the brightness (contrast) of the system's output image is made. The results will be used for providing a theoretical basis and technical support for the research on the infrared imaging system anti-interference ability protection in the battled environment.


Guo B.,Xidian University | Wang X.,Xidian University | Wang X.,No 63870 Unit of PLA | Yuan H.,No 63870 Unit of PLA | Yang H.,No 63870 Unit of PLA
Hongwai yu Jiguang Gongcheng/Infrared and Laser Engineering | Year: 2015

The main factors that affect the imaging characteristic of infrared imaging seeker and the jamming principle of infrared decoys on the imaging characteristic of infrared imaging seeker were analyzed based on signal transfer and conversion mechanism of infrared imaging seeker. Then, with the end-to-end imaging modeling ideas, and considering the impact of infrared decoys on the radiative properties of target surface and the auto gain characteristics of infrared imaging seeker, the imaging characteristics quantitative model of infrared imaging seeker was established. Furthermore, on the basis of theoretical analysis mentioned above, the real-time simulation of the output images and tracking features of infrared imaging seeker after infrared decoys jamming was carried out by computer 3D scene simulation technology, and the tracking performance of the infrared imaging seeker was studied based on the simulation results. The results show that the jamming effect of infrared decoys on the tracking performance of infrared imaging seeker varies with the launching direction of infrared decoys. The infrared decoys show the greatest jamming effect when the launching angle of infrared decoys are about 75°-95°, 190°-215° or 250°-280°, while infrared decoys show the least jamming effect when the launching angles of infrared decoys are about 10°-40°, 150°-170° or 315°-325°. ©, 2015, Chinese Society of Astronautics. All right reserved.


Guo B.-T.,Xidian University | Wang X.-R.,Xidian University | Jing W.-G.,No 63870 Unit Of Pla | Wang X.-B.,No 63870 Unit Of Pla | Chen Y.-J.,Xidian University
Guangzi Xuebao/Acta Photonica Sinica | Year: 2014

Considering the interference of highlight on the radiation characteristics of the target surface and on the signal response characteristic of Low-Light-Level (LLL) TV, a feature quantitative model of LLL TV imaging under highlight disturbance was built based on the mechanism of highlight interference LLL TV imaging and the end-to-end imaging modeling idea. On the basis of the model, the simulation of the output image of LLL TV imaging system after highlight disturbed was performed by real-time calculating the imaging gray of ground objects on the three dimensional scene simulation platform. Contrasting the imaging gray of the target and its background and the imaging contrast of the target in the experimental results with that in the simulation results, the verification of the reliability of the simulation model was performed. The verification results show that the proposed model was greatly consistent with the experimental results and had high reliability. Finally, the influence of different interfering factors on the target imaging contrast was discussed, which showed that the role of highlight to the radiation characteristic of the target surface was the main factor that affecting the system imaging quality when the highlight was outside the field of view of the system, while the role of highlight to the system gain was the main factor when the highlight was in the field of view of the system. ©, 2014, Chinese Optical Society. All right reserved.

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