Ricerc@Sapienza

Passive Bistatic Radar (PBR) systems use noncooperative illuminators of opportunity to detect, localise and track targets. The aim of this paper is to investigate the potential of PBR target detection in the presence of non-random signals emitted by non-cooperative transmitters of opportunity, such as radar systems, and without the use of a reference channel. An experiment to detect a moving target was carried out at the Defence Academy of the United Kingdom to demonstrate target detection capabilities using a low cost off-the-shelf receiver.

This study investigates the potential advantages conveyed by the exploitation of polarimetric diversity in Passive Coherent Location (PCL) system exploiting Digital Video Broadcasting - Terrestrial (DVB-T) signals. To this purpose, different polarimetric detection schemes are considered that jointly exploit the signals collected at different receiving channels characterised by differently polarised antennas. A performance analysis has been carried out using experimental data collected by a passive radar system developed by Fraunhofer, namely PARASOL.

A radar sensor suitable to record carotid wall movements has been developed and tested. The sensor is based on a double-sideband continuous-wave coherent transceiver, operating at 2.45 GHz, and on a bow-tie planar antenna optimized to operate in contact with the neck. Measured transceiver responses on a sliding short load are in good agreement with an analytical model and simulation results. An artificial model of the neck with an embedded pulsatile carotid-artery mockup has been built to test the radar.