1. A bistatic synthetic aperture radar (SAR) imaging system comprising: an illuminator to illuminate a target area with a null-monopulse radiation pattern and a sum radiation pattern, wherein phase terms of the sum radiation pattern are adjusted to maintain a static electromagnetic vector field at the target area; and a receiver to receive the radiation patterns reflected from the target area, to generate phase compensation terms by correlating a measured electromagnetic vector field with the static electromagnetic vector field, and to generate an image of the target area using the phase compensation terms.