Inverse scattering with phase retrieval based on indirect holography via synthesised plane-waves

Abstract

The aim of this study is to present a technique for object geometry retrieval using scattered field information based on phaseless acquisition, so that a scanning system can be implemented without the need of an expensive vector network analyser. The inverse scattering is accomplished through a two-step strategy that is powered thanks to the combination of the scattered signal with a synthesised reference wave. Thus, the phase is firstly recovered by considering the spectral properties of the mixed signal. Secondly, the reflectivity of the object is computed by means of an inverse scattering algorithm accelerated by a multipolar expansion. The technique is applied and validated for planar as well as spherical ranges considering simulated as well as measured data.

Brain Stroke Detection Based on Microwave Imaging

“…Laviada 등은 합성 평면파를 통한 간접 홀로그래피를 사용하여 위상정보가 없어도 오직 진폭 정보만을 사용하 여 물체의 3차원 이미지를 형상화시키는 역산란 알고리 즘을 구현하였으며, 그림 15와 같은 장치를 이용하여 복 잡한 Vector network analyzer를 사용하지 않고도 이미지 형상화에 성공하였다 [38] .…”

A novel phaseless frequency scanning based on indirect holography

“…Indirect holography, as described in [10,12], is based on acquiring the power of a signal coming from the combination of the field scattered by the object under test (OUT) E s and a reference signal E r . The amplitude and phase of the reference signal are supposed to be known.…”

“…The application of this technique (also known as indirect holography) to antenna measurement or inverse scattering problems has been accomplished by combining the radiated or scattered signal with a reference signal which is assumed to be known in amplitude and phase [7]. Further improvements have been carried out to use a synthetic wave [8][9][10] avoiding the characterization of the reference signal.…”

“…The main contribution of this paper is the development of a phaseless setup for frequency sweep measurements derived from the indirect holography schemes with synthetic reference signal [9,10]. Moreover, the minimum FS as well as other required parameters are calculated.…”

Phase retrieval technique for submillimetre‐wave frequency scanning‐based radar system

“…In general, this is achieved at the cost of some modifications in the measurement setup. Among these approaches, the ones based on the indirect holography or 'Leith-Upatnieks holography' [11] have been considerably successful in several fields including antenna measurement [12,13] and scattering problems [14]. In this holographic technique, the scattered field is combined with a reference signal that is phase shifted along the spatial domain.…”