As the battlefield environment becomes more complex, optical guided weapons will face increasingly complex photoelectric interference environment. This paper analyzes the photoelectric interference and interference mode faced by the optical detection system used in surface-to-air missiles, also gives anti-interference methods and simulation results, aiming at providing reference for anti-interference design of surface-to-air missiles.
Optical imaging guidance technology has the advantages of high sensitivity, precision, light and small size. Besides, the radiation intensity of target is less affected by complex meteorological environment without cloud and mist above 20km. As the development of the attack and defense technology, infrared imaging detection technology is one of the main technologies in the strategic attack and defense technology represented by the long-distance fleetly accurately strike. When flight vehicles with infrared imaging systems fly at high speed in the atmosphere, the complex flow field formed between the optical dome and the incoming flow, causes interference of aerodynamic heat, thermal radiation and image transmission to the optical imaging detection system. It not only affects the strength and stiffness of the material, but also seriously reduces the detection ability and precision[1] . This paper puts forward an analysis method of the detection ability of Infrared Imaging System in high thermal environment, and simulates the influence of effect factors on the detection ability. It provides reference to increasing detection distance of infrared Imaging System in high thermal environment.
When high-speed flight vehicles fly in the atmosphere, they can generate serious aero-optical effect. The optical window temperature rises sharply because of aerodynamic heating. It will form radiation interference that can lead infrared detectors to producing non-uniform radiation backgrounds, decreasing system SNR and detection range. Besides, there exits temperature difference due to uneven heating. Under the thermo-optical and elastic-optical effects, optical windows change into inhomogeneous mediums which influence the ray propagation. In this paper, a model of thermal radiation effect was built by a finite element analysis method. Firstly, the optical window was divided into uniform grids. Then, radiation distribution on the focal planes at different angles of the window’s normal line and optical axis was obtained by tracing light rays of each grid. Finally, simulation results indicate that radiation distribution reflects the two directions-the length and width-of temperature distribution, and the change of angle causes the center of radiation distribution to shift to one direction of the image surface under the same window temperature.
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