Modeling And Performance Evaluation Of Electro-optical Imaging System Under Strong Radiation Sources Disturbance

Electro-optical imaging system(EOIS), which is known as the eyes of the modern weapon systems(such as aviation/aerospace surveillance and warning system, precision guided weapon system), has been widely used in military target reconnaissance, surveillance, early warning and precision strikes and other combat missions in recent years due to the ability of working at night and harsh environment conditions without being found easily. EOIS has also been a decisive factor for the implementation of precise detection and identification, accurate capture and tracking, precision strike and save our strength as well as the foundation for victory in the modern battlefield. However, there are kinds of strong radiation sources(SRS) interference methods and models in the modern battlefield, which lead to a serious performance decrease for EOIS. It is necessary and urgent to evaluate the performance of EOIS after SRS interfered, which can provide a theoretical basis and data support for improving the adaption of EOIS on the complex battlefield environment.In order to model and evaluate the performance of EIOS under SRS disturbance, this thesis focus on the radiation and scattering characteristics of target and its background, the radiation characteristics of SRS, the effect of SRS on the radiation characteristics of target and its background, the interference of SRS on the imaging signal characteristics of EOIS. Details are as follows:The first part describes the interference mechanism of SRS on the imaging signal characteristics of EOIS. Firstly, the radiation characteristics of the typical SRS(such as battlefield fire, infrared decoy, flash bomb and laser) are studied by considering the work characteristics, the motion characteristics and the time characteristics of SRS. Secondly, the influence of SRS on the imaging links is analyzed according to the signal transfer conversion mechanism of each component, and the reasons of the change of the output image characteristics after SRS interfered are also introduced. This section provides the theoretical foundation for the work of the second to fifth secion.The second section shows the radiation and scatter characteristics of the target and its background after SRS interfered. The target and its background radiation characteristics model is built with high reliability by studying the relationship between the output signals of different imaging systems. In addition, in order to simulate the radiation characteristics of the target after SRS interfered dynamically, the real time calculation method for the radiation characteristics of of the battlefield environment after SRS interfered is proposed according to the scattering characteristics of target and its background, the radiation and motion characteristics of different kinds of SRS.The third section depicts the quantitative characterization method of imaging signal characteristics of night vision system(NVS) after SRS(such as battlefield fire and flash bomb) interfered. Considering the principle of automatic brightness control circuit and signal response characteristic of NVS, the gain characteristics model of NVS is built to simulate the gain characteristics dynamically after SRS interfered. Moreover, the high reliability halo effect model of NVS after SRS interfered is analyzed based on the principle of photoelectron generation and MCP scattering theory.The fourth section studies the signal quantitative characterization method infrared imaging system(IIS) after SRS(such as battlefield fire, infrared decoy and laser) interfered. Considering the principle of automatic gain control circuit and signal response characteristic of IIS, the gain characteristics model of IIS is built to simulate the gain characteristics dynamically after SRS interfered. Furthermore, according to sinal transfer characteristic and transmission law, the crosstalk effect model of IIS after typical SRS(such as high frequency pulse laser) interfered is proposed by analyzing the the transfer and transmission law of the saturation charge.The fifth section persents the performance of EOIS after SRS interfered. The simulation model of EOIS, which is a complex system of target, background, SRS and the imaging sensor, is analyzed to realize the the digital simulation of NVS after SRS(such as battlefield fire and flash bomb) interfered and that of IIS after SRS(such as battlefield fire, infrared decoy and laser) interfered. Besides, the dynamic simulation method for the tracking performance of EOIS after SRS interfered is proposed according to the working principle of the tracking system and the typical tracking method.