Measuring Sub Pixel Erratic Shift in Egyptsat-1 Aliased Images: proposed method 1M.A. Fkirin, 1S.M. Badway, 2A.K. Helmy, 2S.A. Mohamed 1Department of Industrial Electronic Engineering and Control, Faculty of Electronic Engineering, Menoufia University, Menoufia, Egypt. 2Division of Data Reception Analysis and Receiving Station Affairs, National Authority for Remote Sensing and Space Sciences, Cairo, Egypt.