Radio holography signal reconstruction and shadow inverse synthetic aperture radar imaging in ground-based forward scatter radar: theory and experimental results

The radio hologram signal (RHS) extraction is the pre-condition of shadow inverse synthetic aperture radar (SISAR) imaging in forward scatter radar (FSR). However, for a ground-based FSR imaging system, which usually includes an envelope detection module, it is pretty hard to obtain the complex RHS. Thus a novel method for RHS reconstruction is proposed by considering the relationship between the in-phase part and the orthogonal part. The operation of envelope detection is never combined with segmented Hilbert transform before in RHS reconstruction and detailed skills in applying the method are discussed with simulations. Then, the proposed method is verified through real experimental data processing, of which a metal board and a microbus are regarded as the targets. Furthermore, target profiles via SISAR imaging processing are achieved very well when using the reconstructed RHS.