Passive Forward Scattering Signal Extraction Using Second-Order Vertical Synchrosqueezing

This paper presents preliminary results of the passive forward scattering radar (FSR) signal extraction in a DVB-T-based passive coherent location (PCL) system using the second-order vertical synchrosqueezing in the time-frequency (TF) domain. The method consists of the energy relocation on the TF plane but, contrary to the reassignment method, allows one to preserve the phase content and retrieve the signal or a particular component (mode). This particular concept is described in this paper. The echo from a cooperative target in a specific geometry such as forward scattering is distinguished, which may be useful in the estimation of its parameters, matched filter designing, and the assessment of the kinematic properties of the target. The research is based on real-life signal processing and the results are illustrated, which confirms the usability of the proposed method in PCL systems.