Desiging And Realizing Of The Image Stabilization System Of IR Imaging Seeker

In the past 20～30 years, the imaging infrared seeker shows many outstanding features such as strong anti-interference capability, the ability to distinguish between multi-target, high sensitivity, precision-guided and high-all-weather capability , So it caused national concern. At present countries in the world are focused on the development of various types of missiles based on infrared imaging guidance.Now the focal-plane array components which based on Stirling refrigeration are widely used in the imaging infrared seeker. In the course of flight, the missile gets the influence of disturbed airflow, engine vibration, motor overload, and some other factors, these cause the equipments on the missile subject to greater vibration which beyond the excitation level detectors can bear. So the biggest problem is how to reduce the virbration of focal-plane array components based on Stirling refrigeration and obtain the infrared video image to meet the requirements of stabilization precision at the same time .The research of this paper based on the characteristics of imaging infrared seeker,combined the demand of domestic equipment, mainly done the research work as follows:First made the design of the imaging infrared seeker. Analysised its working principles, composition, characteristics ,and the influence to imaging when receives the vibration, according to the Structural features of the seeker,done some works folloeing:placed detector in inner ring, selected the vibration mode of the whole two-dimensional framework reducing vibration,used the three-dimensional equal stiffness metal vibration isolators with symmetrical layout, made the excitation level of the detector and the aggle displacement of the framework meet the demands of the design, made the design of control system suited to the vibration reduction system, in order to get a higher image stabilization precision, we selected a dual DC torque motor direct driven approach and velocity gyroscope for the system.Second, established the mathematical models of the passive vibration and control system ,then made the simulation analysis. Pointed out that technical measures as follows can reduce the angle displacement, such as increasing the distance between the vibration absorbers and taking symmetrical arrangement, making the inertia of the vibration reduction objects as small as possible,and so on.then analysised the dual-motor-driven model, pointing out that two-motor drive having benefit for reducing electrical and mechanical constant and increasing the rapid of system. At the same time, estimated the main factors that influence to image stabilization precision such as stiffness of the major components, mechanical resonance frequency, the gyroscope noise, and so on.Finally, made the test verification of the image stabilization system, founded that the virbration isolated efficiency and the angle displacement meet the basic requirements, the isolation reached 1.5%, these proved the correctness of principle, then analysised the experimental result and the testing method, cleared the work of next step.