Research On The Restoration Method Of Satellite Platform Vibration Image And Experimental Verification

With the development of space technology in China,the resolution of optical remote sensing satellite launched by China is continuously increasing.However,with the increase of resolution,the vibration of satellite platform has become an important factor affecting the quality of satellite imaging.Space optical satellites are usually imaged by TDICCD scanning to increase exposure time,the vibration of platform causes the TDICCD pixel information to be misplaced,cause geometric distortion and blurred image in acquired image.In this paper,the mechanism of image degradation is analyzed,and the corresponding image restoration algorithms are studied,the ground simulation experiment platform is built to verify the image restoration algorithm.The specific contents include:(1)Analysis of vibration effects on TDICCD imaging.The imaging principle of TDICCD camera is introduced.The mechanism of image geometric distortion and image blurring caused by vibration is analyzed,and the digital simulation method of TDICCD dynamic imaging is established.(2)Vibration restoration algorithm for satellite platform.According to influence of vibration on image quality,A forward mathematical model of vibration imaging is established,and the calculation method of model parameters is given based on vibration data.Based on the forward vibration imaging model,the method of vibration image restoration is studied,a new model of vibration image restoration is established by introducing variational regularization term,and the iterative threshold shrinkage algorithm is used to study the algorithm of image restoration model.Finally,the vibration image restoration algorithm is analyzed by simulation experiments.(3)Experimental studying on vibration imaging of TDICCD camera.The experimental principle of vibration imaging of TDICCD camera is designed based on planar array camera,and the TDICCD camera vibration imaging simulation experiment platform is set up,the experimental platform uses a fast deflection mirror to simulate the vibration image shift,capable of simulating 200Hz frequency vibration the highest frequency.the vibration images of 10Hz,100Hz and 200Hz are obtained by using the experimental platform,and the vibration image restoration processing is carried out.The processing results show that the vibration image restoration algorithm can effectively eliminate geometric distortion and image blur caused by vibration.