Evaluation Of Band Registration Error Of Domestic Optical Remote Sensing Satellite

With the continuous development of domestic optical remote sensing mapping satellite technology,the study of band registration error has always been the premise and basis of satellite image research.The traditional research process of band registration is based on band registration,and then carry out the registration evaluation directly,thus ignoring the influence of the ground feature points errors with the same name,which makes the registration error lack of scientific reliability.Taking the multispectral images of Gao Fen-7satellite as experiment object,which has the highest spatial resolution.Analyzing multispectral images imaging principle,band registration and the factors influencing the band registration accuracy,then we use Virtual CCD Re-imaging Algorithm compensation within the camera distortion error,take Non-Local Means Filtering(NLMF)Algorithm to remove error caused by the ground feature points with the same name,finally we explore the relationship of satellite platform jitter and registration error.This paper applies the multi-spectral images obtained by Gao Fen-7 satellite at 2019/11/05,2019/11/10 and2019/11/13 as research examples,the following experimental results can be obtained through experimental analysis:(1)Non-Local Means Filtering Algorithm can effectively remove the influence of image registration errors.The larger the filter parameter,the more blurred the image.When the filtering parameters are in the range of 40?90,the denoising effect is the same.We can see that the smaller the mean of registration error and the more stable the error distribution in the range of 40?90.(2)Satellite high-frequency jitter can affect band registration accuracy.Using the line direction of registration error to spectrum analysis,which including the temporal characteristics.Then fitting errors with the Fourier function,the distribution of registration error is around the fitting curve,which is drew by the frequency,amplitude in satellite platform vibration testing.And from the above results,jitter movement is also proved that the satellite platform cycle regularly,which affecting regular band registration errors.(3)The experimental data on 2019/11/05,the image is affected by satellite platform pitch more obvious.With the spectrum analysis of the across-track and along-track line errors,we can know that the along-track errors have greater amplitude.After eliminating the above factors,the results of across-track line error within 0 ? 0.02 pixels,which of along-track line error within 0 ? 0.03 pixels.Compared to those of before eliminating the factors,all errors fall 0.02 pixels,which can improve the final registration accuracy obviously,and can ensure the reliability of the band registration error.