Research On Method Of Image Motion Compensation Of Space High Resolution Cameras' Collecting Scene Agilely

With the continuous improvement of space camera resolution, in addition to thepursuit of the camera's high ground resolution, the images' collection efficiency ofcamera has also been more stringent required by countries that have powerful spacetechnology, and more aspects of application of image were promoted, then agileimaging emerged and became an important one of research directions. Requirementsof the different agile imaging modes to the image motion compensation of highresolution space cameras were analyzed,and method of image motion compensationwas researched to adapt the large angle of roll and pitch attitudes of agile aircraftin this paper.First, with reference to foreign agile imaging satellites, single band imaging,multi-track continuous band imaging, same-track continuous band imaging,multi-track stereo imaging, same-track stereo imaging and same-track multi-targetimaging modes was planed when the three-axis attitudes of aircraft are steady,andthe characteristic and good of each imaging mode was studied. The six modes ofagile imaging were also divided in to three kinds: roll imaging, pitch imaging andboth roll and pitch imaging in according to the requirements to the attitudes ofaircrafts.Secondly, the establishment of instantaneous-state geometric imaging model was established, and used to qualitatively analyze the requirement of the roll imagingand pitch image to the image motion compensation. According to the homogeneouscoordinate transformation matrix and the transformation process from the scene tothe image plane, an image motion velocity vector computational model was built,and a precise formula of image motion velocity was derived. The precise imagemotion vector model and transfer function evaluation method were applied toquantitatively analyze the requirement of three kinds of agile imaging mode to theimage motion compensation.Thirdly, error sources of image motion velocity's relative error and drift angle'serror were summarized when the conventional compensation method of imagemotion was applied to agile imaging. Matching error, estimation error andcumulative error of drift angle and matching error and estimation error of imagemotion velocity were analyzed to determine adaptability of the conventionalcompensation method to agile imaging, and then three pivotal problems that need tobe solved were discovered in order to fit agile imaging mode of large roll imagingand pitch imaging.The three problems are problem of roll imaging,problem ofpersistent imaging and problem of pitch imaging.Fourthly, three issues of agile imaging solutions were studied. The principle ofmethods of the multi-velocity match of image motion velocity and real-timeadjustment of drift angle were analyzed, and that were validated by experiment onground and test in orbit. A mathematical model of the additional error of drift'sframework was modeled when drift angle was revolving. A theory of creating imageof transverse image motion was promoted by reaching the imaging process of TDICCD. A method of composing integrated group of equations was brought up torecover image of transverse image motion. The method was validated in theemulation environment, and the arithmetic precision was analyzed.Finally, based on the methods of multi-velocity match of image motion velocity,real-time adjustment of, and composing integrated group of equations, a agile imageplane of was designed for agile imaging,and a blue print of agile imaging of high-resolution space cameras was put forward to adapt to large angles of roll andpitch attitudes of aircraft based on the agile image plane,that provide academic baseto the development of image motion compensation of space high resolution cameras'collecting scene agilely.