Research On Image Motion Compensation And Target Location For Wide Range Aerial Camera

In recent years,with the technological maturity and performance improvement of CCD and CMOS imaging chips,the airborne photoelectric imaging camera has developed rapidly and is widely used in military and civilian fields.Due to the increasingly demand for high temporal,high spatial and high spectral resolution and the high requirements for efficiency and effectiveness of the imaging reconnaissance at the same time,it needs to obtain both high resolution and wide image.In addition,there are urgent needs for airborne mapping,military reconnaissance of passive target positioning control points.At present,there are many methods to obtain wide range images.In this paper,we adopt the SCMOS chips of planar array imaging,and extend the imaging field by means of scanning imaging,thus increasing the width of imaging.Because scanning image motion caused by dynamic scanning imaging based on moving pedestal,forward image motion caused by fight forward fly and vibration image motion caused by vibration,the image quality will degrade.These are the main factors which affect the imaging quality,so the wide field imaging integrated image motion compensation is one of the key technologies in aviation camera.The POS system and the camera are rigidly connected,then the exposure position and attitude information can be obtained by sweeping through coordinate transformation and calculation.Passive target positioning of airborne aerial camera is a new application,the paper propose a new method to realize target location.Analyzing POS and camera model establishment and various factors in detail for location,we can obtain target location information and realize passive location of ground targets.The paper treats the high resolution and wide field camera loading on a UAV as the research object,and has a study on comprehensive image motion for wide field of dynamic imaging and camera passive location technology based on POS system.It lays the technical foundation for the engineering application of this kind of camera.This paper first introduces the status and development trend of domestic and foreign aviation camera,and comparison of the advantages and disadvantages of the typical wide aerial camera mechanism.The paper uses matrix continuous whiskbroom to achieve wide imaging and optical motion compensation technology.For this wide imaging optical system,analysis various factors of image motion and then allocate error exactly with the minimum amount of image motion.Base on the error distribution model of image motion compensation accuracy,establish the installed model of compensation reflection mirror,compensation accuracy of compensation mirror,compensation speed of scanning mirror and the transformation model.Finally,analyze the simulation and verify the results of theoretical analysis by using the method of imaging test.For the application requirements of airborne passive target positioning in military reconnaissance,reconnaissance and attack integration,electro-optical pod,and so on,military equipment and civil rescue,the paper carries out the typical flight altitude of 5000 meters altitude target positioning technology research with precision better than 20 meters.An innovative method of passive target localization is proposed,which uses IMU and camera rigid connection,synchronously sweeping after high precision calibration,and through coordinate transformation and precision analysis.So,no ground control point is needed to achieve passive target location.This method determines the accuracy of POS system according to the precision analysis,establishes static and moving coordinate system model from the airplane to the camera to the target,and carries out accurate calibration of relative position and inner orientation elements between camera and the POS system.Thus,passive localization of targets under dynamic scanning imaging is realized.