The effect radar imaging of astroids by migration of slant stacked data

Abstract

The structure of asteroids remains ill-unknown due to few effective methods to accurately image their interior. In this paper, using a synthetic model of an asteroid, radar imaging by migration of slant stacked data is studied. The basis for this method relies on beamforming in the electric wave?eld due to the interference of pointsource responses. This method, here referred to as waveform Synthetic Aperture Radar (SAR) imaging, is evaluated for migration at both the source- and receiver-side, but results are very comparable. Waveform SAR is compared to imaging with zero-offset data as well as multi-offset data, the latter only acquirable by using more than one satellite in practice. Waveform SAR shows better image quality than zero-offset data migration when the target is coarsely spatially sampled by data points. This is because the image using waveform SAR is more accurate per shot, due to ampli?cation of signal near the true location of scatterers.