When the airborne infrared imaging system searches and strikes ground targets, it is mainly used to extract target information from complex background interference images on the ground and transmit it to the driving or automatic guidance system, forming the position and motion information of the missile relative to the target, in order to better track the target and output information to control the missile's flight. The airborne infrared imaging system detects, recognizes, and the tracking performance is closely related to the infrared radiation characteristics of the background. This article focuses on the research of multiband characteristics of military application targets and backgrounds. On the basis of unified standards, a database management system is established to meet the management and query functions of measured infrared characteristics data of typical backgrounds such as deserts, grasslands, mountains, and forests in different seasons and at different times, as well as the development of an infrared imaging detection performance evaluation system, We studied the detection and recognition probabilities of infrared imaging systems for targets at different distances in different background environments, and provided theoretical calculation results for the detection range of a certain type of installed airborne infrared imaging detection system for 2m * 2m sized targets in the 3.7μm-4.8μm band at 9:00, 16:00, and 21:00 in a summer grassland background in a certain area. This provides support for the design and development of infrared imaging weapons and equipment.
In order to meet the needs of counter photoelectric detection and precision guidance weapons in modern air warfare, the spectral characteristics of smoke image jamming unit were tested. Based on the analysis of the factors affecting the smoke interference performance, a theoretical calculation model is established, and a feasible test method is proposed. A certain type of smoke jamming unit was tested. We obtained the smoke transmittance curveof0.4-0.76um,1.3-3um,3-5um,8-14um and MWIR and LWIR image of typical time period, which laid a foundation for the further development of smoke jamming unit with better performance.
This paper has carried out experiments on the influence of spectral resolution and channel number on the camouflage target recognition of imaging spectrometer. Based on the measured data, the camouflage helmet is selected as the spectral curve of camouflage target for resampling, and the spectral curve obtained under different spectral resolution and channel number conditions is simulated. Qualitative analysis is carried out by graphic method, interpolation operation is carried out on the resampling spectral data, and quantitative analysis is carried out by using SAM (Sepctral Angle Mapper) method. The resampling target characteristic spectral curve is compared with the original spectral curve in different ranges. The experimental conclusion is obtained by analyzing the spectral characteristics of the camouflage target under different spectral resolution and different channel number conditions, it can provide theoretical basis and technical support for the determination and optimization of spectral resolution and channel number of imaging spectrometer used for camouflage target recognition.
It is a great significance to study the simulation device of missile IR characteristics for improving the performance test of photoelectric detection equipment. Based on the analysis of the IR characteristic of the thermal radiation of the missile tail flame, a mathematical model of the thermal radiation of the missile tail flame is established, which is combined with the atmospheric transmittance model. The scheme design of structure module, temperature control module is given for MWIR and LWIR respectively. Taking a certain type of missile as an example, an experimental platform was built to verify the feasibility of the method.
Aiming at the application requirements of camouflage effectiveness evaluation of targets (personnel, vehicles covered with camouflage nets, aircraft and other camouflage equipment), a near-infrared light imaging spectrometer based on acousto-optic tunable filter (AOTF) is developed to collect the optical characteristic data of targets. By analyzing the AOTF light splitting principle and the synchronous control principle of the RF driver and COMS camera, combined with the actual needs of the imaging spectrometer in the project, the design scheme of the data acquisition system is formulated, the design process of the system based on the QT Creator platform is described in detail, and the acquisition software is developed.
Recently, hyperspectral image projectors (HIP) have been developed in the field of remote sensing. For the advanced performance of system-level validation, target detection and hyperspectral image calibration, HIP has great possibility of development in military, medicine, commercial and so on. HIP is based on the digital micro-mirror device (DMD) and projection technology, which is capable to project arbitrary programmable spectra (controlled by PC) into the each pixel of the IUT1 (instrument under test), such that the projected image could simulate realistic scenes that hyperspectral image could be measured during its use and enable system-level performance testing and validation. In this paper, we built a visible hyperspectral image projector also called the visible target simulator with double DMDs, which the first DMD is used to product the selected monochromatic light from the wavelength of 410 to 720 um, and the light come to the other one. Then we use computer to load image of realistic scenes to the second DMD, so that the target condition and background could be project by the second DMD with the selected monochromatic light. The target condition can be simulated and the experiment could be controlled and repeated in the lab, making the detector instrument could be tested in the lab. For the moment, we make the focus on the spectral engine design include the optical system, research of DMD programmable spectrum and the spectral resolution of the selected spectrum. The detail is shown.
Overall structure of the infrared target simulator system and the principle of DMD are introduced. When DMD is on “open” state, all of the incidence light can rip into the pupil of the projection system. In addition, when it is on “close” state or “flat” state, all of the incident light can’t rip into the pupil of the projection system. Based on this principle, with a specific infrared target simulator, TIR prism with BaF2 as material is designed. And then, this design is improved by ZnSe material instead of BaF2. ZnSe transmission rate is very well in the range of 0.6 microns to 14 microns and the infrared target simulator in this project requires 3 to 5 microns and 8 to 14 microns wavelength. This material is hard and easy to be processed. The design idea and design process are introduced in details in this paper and angle parameters are obtained. To improve light utilization and image quality in infrared target simulator system, two types of thin film on TIR prism different surfaces are designed. One is high transmittance with incidence angle of 0° and 24°,the other is 55°. Finally, this scheme is simulated and optimized by Tracepro software. Approving results were acquired.
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