Radar imaging using the ramp response technique in arbitrary directions

Radar imaging in low frequency can reconstruct the global shape of targets (buried or stealthy) using the ramp response technique, which only needs no more than 3 observing angles. With the ramp response technique, existing three-dimensional (3D) image reconstruction algorithms work well for orthogonal observing directions, but produce distorted images for the non-orthogonal case. Therefore, we apply the level set method, which has been widely used in capturing dynamic interfaces and shapes, to optimize the image reconstruction from arbitrary observing directions. Satisfactory results are obtained.