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In this paper, we investigate full-wave computed radar tomography (CRT) usinga rubble-pile asteroid model in which a realistic shape (Itokawa) is coupledwith a synthetic material composition and structure model. The aim is to showthat sparse bistatic radar measurements can distinguish details inside acomplex-structured rubble-pile asteroid. The results obtained suggest thatdistinct local permittivity distribution changes such as surface layers, voids,low-permittivity anomalies, high-permittivity boulders, and cracks can bedetected with bistatic CRT, when the total noise level in the data is around-10 dB with respect to the signal amplitude. Moreover, the bistatic measurementset-up improves the robustness of the inversion compared to the monostaticcase. Reconstructing the smooth Gaussian background distribution was found tobe difficult with the present approach, suggesting that complementarytechniques, such as gravimetry, might be needed to improve the reliability ofthe inference in practice.

Bistatic full-wave radar tomography detects deep interior voids, cracks and boulders in a rubble-pile asteroid model