We present an advanced algorithm to suppress multipath clutter in passive radar systems using OFDM signals for surveillance. Multipath clutter signals not only lead to enormous zero Doppler signals in the range Doppler domain, they also induce intense side lobes when the multipath signals have additional small Doppler shifts to the reference signal and thereby can mask targets with small Doppler frequencies and small SNR. The proposed algorithm, denominated as Enhanced Cancellation Algorithm by Carrier and Doppler Shift (ECA-CD), removes multipath clutter signals and reduces its side lobes. Its implementation and experimental tests show the effectiveness of multipath signal suppression in real time

This paper investigates the utilization of satellite broadcast signals such as DVB-S and DVB-S2 as illuminator of opportunity for passive radar imaging techniques like SAR or ISAR. It includes an analysis of the key elements of the structure of the DVB-S2 signal and their implications for SAR/ISAR signal processing, with particular emphasis on the interference properties due to the presence of multiple illuminating satellites. Moreover, first real world DVB-S based radar images are presented using a newly developed passive radar system

We investigate the capability of beam space transformation based Direction of Arrival (DoA) estimation algorithms and an auto calibration method for the application in passive radar systems using real field measurements. For this, we considered three different DoA methods: Taylor, Minimum Variance Distortionless Response (MVDR)-Capon and a modified Bucci algorithm. All these methods employ phase mode excitation-based beamspace transformation. We also investigate the ability of the Uniform Circular Array (UCA) to perform self-calibration directly from the received DVB-T signal. The results have confirmed satisfactory estimation and detection performance

We demonstrate the ability of a passive radar system to monitor a large area of interest by applying advanced multipath clutter cancellation algorithm, spatial beamforming and tracking techniques. The mitigation of clutter disturbance and a two stage beamforming method facilitate real time tracking of small to moderate size targets in real Cartesian domain. The results have been validated through a real data acquisition campaign performed using an eleven element array antenna based passive radar developed at FHR Institute in Germany

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