In the traditional coaxial infrared television optical system, the central aperture of the infrared imaging system will be blocked by the television imaging system, which will cause obvious loss of luminous flux and decrease of diffraction limit. Because television imaging system is in the infrared channel, the infrared and television system size, configuration, performance, assembly will affect each other, which increases the design and assembly difficulty, as well as processing assembly and maintenance difficulty. In this paper, an off-axis infrared television composite optical system is designed. The infrared and television systems are decoupled from each other without interference. Two tilt lenses are added in front of the lens to correct the aberration of the television. The results show that the performance of off-axis infrared television composite optical system is better than that coaxial infrared television composite optical system.
In this paper, the process and key technologies of infrared simulation are studied to meet the needs of infrared simulation of warships. Based on the knowledge of Infrared Physics and infrared radiation, the infrared radiation model of warship target and ocean background, the attenuation model of atmosphere to infrared radiation and the noise model of infrared detector are analyzed and established. Using JRM scene simulation software, the dynamic continuous infrared imaging simulation of ocean scene is realized, and the ocean environment, simulation band, noise effect and ship motion can be set. Through the construction of ocean scene infrared simulation system, it can effectively realize the real-time solution of complex sea infrared scene, and can be applied to the simulation research of anti-warship weapon scheme evaluation, sea infrared target tracking algorithm verification and so on.
Hardware in the loop simulation test technology of electro-optic system includes video injection technology and dynamic projection technology. Firstly, the dynamic infrared scene simulation technology is used to generate missile attack and complex jamming scene images; Secondly, the digital video is injected to simulate the front-end sensor and stimulate the integrated processor to detect and track the target; Finally, the large field of view medium wave infrared dynamic target simulator is used to build the missile threat environment to carry out the functional performance test of electro-optic system under the threat of single/multi-target attack. The experimental results show that the technology can build complex scenes according to the battlefield scenario, test the processing capacity of electro-optic system under the threat of single/multi-target attack, support the verification of search, acquisition, tracking and other performance indicators of electro-optic system, and provide support conditions for the development and debugging of core algorithms of electro-optic system.
Infrared imaging seeker is the main direction of optical imaging seeker technology. Infrared imaging system determines the detection performance and tracking accuracy of the infrared seeker, and it is also the key factor for the miniaturization and lightweight of the seeker. Optical structure layout is the design key of infrared optical system. This paper introduces the traditional refractive, reflection, catadioptric optical system layout as well as the new off-axis reflection, hybrid refractive-diffractive, Kuder optical path, free-form surface optical form, and analyses its advantages and disadvantages from weight, volume, image quality, installation and debugging. Fairing is a key part of the optical system of infrared imaging seeker. It plays a high transmittance to the infrared band and protects the seeker from adverse external environment. This paper introduces the common materials of the fairing, the design of the fairing under hypersonic speed and the design method of the conformal optical system. The advance technologies of optical system design are introduced, including binary optics based on light wave diffraction theory, computational optics based on geometric optics, information optics and modern signal processing, micro-optics with great prospects for minimizing the seeker optical system, and adaptive optics which can overcome and compensate for the effects of atmospheric turbulence, and super lens technology using nanotechnology. This paper believes that the optical system of the future seeker should be based on the etching, material and surface design, and the technology of computational optics and signal processing will be widely used in optic design of seeker.
In order to verify the performance of electro-optical products under the condition of large maneuver on the ground and further improve the tracking stability and accuracy of electro-optical products, the flight simulation test technology of large maneuver is studied. The characteristics of typical maneuvers are analyzed, and the motion simulation model which can realize the expected maneuvers is established. On this basis, the overall framework of the large maneuver flight simulation test system is constructed, and the test scheme is designed to verify the feasibility of the large maneuver simulation test system and the accuracy of the maneuver simulation model.
The traditional operating distance model of infrared imaging system is only valid under the condition that the background is single and invariable. For the sea surface targets, radiation characteristics are affected by the sea-sky-line, specular reflection, sea clutter and so on, resulting in a large calculation error of operating distance if traditional operating distance model was used. In this paper, the operating path of infrared imaging system is divided into chaotic path and methodical path. The chaotic path is the operating path with a certain slant distance from the sea surface target, the infrared radiation propagation characteristics of the target in this path are uncertain, multivalued and volatile, showing certain chaotic characteristics. The methodical path is from observation point of infrared imaging system to the terminal point of chaotic path, the infrared radiation propagation characteristics of the target in this path are certain regularity and linearity, which can be estimated by using the traditional operating distance model. The main work of this paper is to subdivide and characterize the infrared radiation characteristics of the sea surface target in the chaotic path, and finally linearize it in a specific situation, convert the radiation energy of the sea surface target to the starting point of the methodical path, and at last calculate the operating distance according to the traditional operating distance model of infrared imaging system. This method is innovative in theory and can give a reference to the research of infrared system detection range under complex backgrounds.
The emergence of HTV-2, X-51A and other near space hypersonic vehicles poses a new challenge to radar target tracking. Near space hypersonic vehicle has the characteristics of high speed and high maneuverability, but the tracking performance of conventional tracking algorithm is low, which can not meet the operational requirements. In this paper, the technical difficulties of near space target tracking are described. By analyzing the motion characteristics of near space hypersonic vehicle, the dynamics model of HTV-2 is established, and a tracking method based on interacting multiple model (IMM) for near space vehicle is proposed. At the same time, considering the unscented Kalman filter (UKF) algorithm has a better filtering effect on strong nonlinear object. The simulation results show that, the interact multiple model-unscented Kalman filter (IMM-UKF) algorithm is better than the single model EKF algorithm.
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