We can get much useful information by remote sensing sensor. Wake disturbances contain information about the generating vessels speed

course

length. Space-based sensor system could provide naval force with an enhanced capability for surveillance of ship traffic in open ocean areas if the information content of signatures associated with the hydrodynamic wake of a moving ship can be exploited. In this paper

the detection of wakes obtained form satellite images using synthetic aperture radar techniques is discussed. First we analyze the patterns of ship wake in SAR images. Then it is concluded that the problem can be considered a detecting line problem

and we describe the theory and the characteristics of Radon Transform briefly. Finally

we apply Radon Transform to detect narrow-V ship wake from some ERS-1 SAR images. The results show that the algorithm is effective.