Optimum Structure Of Optical-Mechanical System For Three-Line Array Aerial Camera

The three line array aerial camera is composed of three groups of line arrays: front view,direct view and rear view.The remote sensing platform uses three groups of linear array CCD sensors to push and scan the measured target in turn during flight.The resulting image has the characteristics of "line center projection".The detection element is a high-resolution three line array CCD,and the lens uses the projection method with the center vertical to realize the extended function of multispectral imaging.At the same time,it is also a real thing.At present,stereo photogrammetry has obvious advantages in data validity and image quality.No matter what form of photographing system tends to the development direction of large-scale and large-scale.In the application field of UAV remote sensing mapping and linear array push scan aerial camera,it is the key to solve the problems of low accuracy of aerial triangulation mapping,slow data processing speed and low operation efficiency in order to meet the customer's demand for high efficiency and accurate mapping.Recently,the technical problems of small and light linear array push scan camera are mainly reflected in the problems of heavy load and huge volume.The light and small three line array aerial camera is still the blank of photographic products in the industry.In order to solve these problems,the specific research contents include:(1)The optimization model of three line array aerial camera is established.In the light and small three line array aerial camera system,the space level area array COMS detector is applied in the airborne linear array.The design idea of three line array push scan imaging is the single lens mode,which makes the whole system light and small,and realizes the function of unmanned airborne remote sensing mapping.The high-precision three-axis orthophoto stabilized platform is equipped with a three-line array aerial camera,and the self-developed multispectral telecentric aerial camera lens is used to realize the system industry application of aerial photogrammetry and remote sensing in the visible and near-infrared band.(2)In order to realize the lightweight design of the camera,the structural optimization and design of the swing scanning mechanism,the comparative analysis and selection of lightweight materials and the advanced manufacturing technology are studied.After the topology optimization,the modal analysis of the transfer plate,the external frame and the swing scanning frame are carried out.(3)Experimental verification: using flight simulation turntable to simulate the attitude change of the aircraft in flight,the error range of angular position accuracy and angular velocity accuracy of the camera swing scanning mechanism in the actual attitude change environment is obtained,the accuracy of the system error model is verified,and the optimal design result of the optical mechanical system is verified.Aiming at the optical system model of three line array aerial camera with large field of view,long distance,high-resolution and low altitude flight applications,it is the first time in the industry to realize the optimal design of optical system,select specific technical indicators,and verify the accuracy of the optimal design through experiments.The data conclusion can provide technical support for the system design of three line array aerial camera.