I. Introduction
This paper studies the feasibility of using a millimeter-wave linear frequency-modulated continuous-wave (LFMCW) radar in a Through-the-Wall Surveillance (TWS) application. Through-the-Wall Radar (TWR) is a challenge for surveillance in both civil and military applications [1]–[4]. Police and other law enforcement agencies are interested in the detection and localization of a person on the other side of a door, behind a wall, above the ceiling, or below the floor. This knowledge could provide a great advantage when making tactical decisions. Therefore, the study of techniques to compensate wall influences and to improve the performance of TWR has become an active topic in the last few years [5]–[11].