Study on relation between stabilization precision and sight range of airborne stabilized sighting system

Helicopter stabilization-aiming system is disturbed strongly by the strong vibration of the engine and rotated wing during the helicopter flight,which seriously affects the sight range of the electro-optical system.Because of the compensation of the stabilized sighting system servo control,the residual disturbing quantity can be expressed as the stabilization precision,the sight range is still affected by this disturbing quantity.The stabilization precision and sight range are the critical technical index,the relation between them is the important issue to design the stabilization-aiming system.After the sight range calculation principle is analyzed,the dynamic modulation transfer function model and dynamic minimum resolvable temperature difference model are established.The experimental method and installation are designed,the vibration of helicopter stabilized sighting system is simulated by experimentation,and in order to get the MRTD of infrared imaging system under vibration,the sight range under vibration can be calculated according to the MRTD curve of the system,finally,the relation between stabilization precision and sight range can be obtained,which provide the theoretical foundation for the design of the stabilized sighting system.