Combined passive and active millimeter-wave imaging system for concealed objects detection

In this paper, a comparison between both imaging techniques is performed with the aim of integrating both in a single imaging system. It is expected that the combination of the coherent and incoherent radiation in active and passive operation will offer improved detection and identification of concealed objects. An interferometric radiometer and an active mills-cross have been studied as near field imaging systems. The main parameters have been simulated to foresee their performance as image scanning systems. Moreover, a T-shape active imaging system has been built and measurements have been done in order to test and assess the performance of this imaging geometry.