A Level-Set Approach for Radar Imaging From Ramp Response in Arbitrary Directions

Low frequency Radar imaging can be used to reconstruct the global shape of targets using the ramp response technique, which only needs no more than 3 observing angles. We have developed a new algorithm permitting to generate promising shapes of targets for mutually orthogonal directions, but giving distorted results otherwise. To solve this ill-posed inverse problem, we use the level set method, which iteratively deforms the shape of the target under a velocity field, and we analyze the property of the desirable velocity. Numerical results obtained by this method in arbitrary directions are given as well.