Ricerc@Sapienza

This paper addresses the problem of a passive radar system mounted on a moving platform with the purpose of Ground Moving Target Indication (GMTI). When exploiting digital communication signals for passive radar, the signal structures result in ambiguities and grating-lobes which may overlap echo signals of targets, which are then difficult to detect. Echo signals of targets can also be covered by Doppler-shift induced from the receiver’s motion. We suggest to apply a reciprocal filter for ambiguities removal and the Displaced-Phase Centre- Antenna (DPCA) technique for clutter removal.

This paper addresses the problem of direct signal interference (DSI) and clutter cancellation for passive radar systems on moving platforms employing displaced phase centre antenna (DPCA) approach. Attention is focused on the development of signal processing strategies able to compensate for the limitations deriving from amplitude and phase imbalances that affect the two channels employed on receive.

Passive radar has reached a stage of maturity such that it can be mounted on mobile platforms for the purpose of moving-target-detection. However some constraints limit the capability of target detection within the Doppler spread clutter region which arises due to the receiver's movement. Typically employed terrestrial illuminators of opportunity transmit in the Very High Frequency/Ultra High Frequency band, which puts some constraints on the size and number of employed antenna elements.