Two-dimensional location of moving targets within local areas using WiFi-based multistatic passive radar

In this study the authors investigate the two-dimensional target localisation capabilities of a passive radar system based on WiFi transmissions. It is well known that the most straightforward way to achieve the target position estimation in the horizontal plane with a passive radar exploits the measurements either of a single bistatic range plus a direction of arrival (DoA) or of two bistatic ranges collected by two separate receivers. However, for a practical application it is interesting to clearly define which one of the two approaches provides the passive radar target localisation with a higher accuracy and whether combining both multiple bistatic range plus DoA measurements provides a further advantage. A multistatic configuration is considered which allows to collect a set of range/Doppler/angle measurements for a given target. Different target localisation strategies are devised and compared, based on subsets of the available measurements with the aim of understanding the localisation accuracies achievable using the different combinations of measurements. Experimental results are shown based on a passive radar prototype developed and fielded at the DIET Department - Sapienza University of Rome. This will contribute to demonstrate the fruitful application of the passive radar concept for short range surveillance

Localization and tracking of moving targets with WiFi-based passive radar

This paper investigates the possibility of obtaining localization and tracking of moving targets by exploiting a passive radar system based on WiFi transmissions. Specifically, the exploitation of multiple passive sensors is considered which allows to collect a set of range/Doppler/DoA measures for a given target when observed at different bistatic geometries. Different target localization strategies are investigated based on proper subsets of the available measures. Experimental results are shown which have been obtained by means of a passive radar prototype developed and fielded at the DIET Dept. - Sapienza University of Rome. This will contribute to demonstrate the fruitful application of the passive radar concept for short range surveillance. © 2012 IEEE

Receiver architecture for multi-standard based Passive Bistatic Radar

In this paper a receiver architecture for a Passive Bistatic Radar (PBR) based on multiple broadcast signals is described. Specific receiver sections are foreseen for each selected waveform of opportunity, while a common part of the system performs the I&Q demodulation and the Analog-to-Digital conversion. The scheme for a double conversion (up-conversion stage from Radio Frequency to Intermediate Frequency and down-conversion from IF to Base Band) of the received signals is introduced for PBR applications. This allows to remove the image frequency even in the wide bandwidth occupied by the digital TV signals. A prototype of the proposed concept has been developed and fielded, with proper laboratory tests and real data acquisition campaigns, at DIET Dept. of the University of Rome 'La Sapienza'. The results obtained with the receiver, in two possible configurations, are reported and discussed: FM-based PBR (for medium/long-range air targets surveillance) and WiFi-based PBR (for short-range human target localization). © 2013 IEEE

High resolution cross-range profiling with Passive Radar via ISAR processing

This paper investigates the possibility of applying Inverse Synthetic Aperture Radar (ISAR) processing in Passive Radar. The purpose is to obtain high resolution cross-rang profiling of moving targets that could provide important information for their discrimination and automatic recognition. The case study consist of a passive radar based on WiFi transmissions for vehicular targets monitoring. The data processing flow is presented and the obtainable performance in terms of azimuth resolution are discussed. The preliminary results obtained by means of an experimental setup developed and fielded at the DIET Dep. - University of Rome La Sapienza -, show that the considered approach is promising thus preliminarily demonstrating the fruitful application of ISAR processing in WiFi-based Passive Radar. © 2011 DGON

A Flexible Receiver Architecture for Multi-Band Passive Bistatic Radar

In this paper a flexible receiver architecture is described for a Passive Bistatic Radar (PBR) that can exploit any of the many broadcast signals available in the frequency spectrum, going from the FM and VHF-UHF bands (DAB/DVB-T) to the S-band (WiFi/WiMax/LTE). Specific front-ends receiver sections are foreseen for each selected waveform of opportunity, while a common part of the system performs the I&Q demodulation and the Analog-to-Digital (A/D) conversion. The scheme can be used both for a direct I&Q conversion and for a double conversion (up-conversion stage from Radio Frequency-RF-to a high Intermediate Frequency-IF-and down-conversion from IF to Base Band-BB-) of the received signals for PBR applications. This allows to remove the image frequency even in the wide bandwidth occupied by the digital TV signals. A prototype of the proposed concept has been developed and fielded, with proper laboratory tests and real data acquisition campaigns, at DIET Dept. of the University of Rome 'La Sapienza'. The results obtained with the receiver, in three possible configurations, are reported and discussed: FM-based PBR (for medium/long-range air targets surveillance), DAB/DVB-T (for medium range air and sea surveillance) and WiFi-based PBR (for short-range human target localization). © 2013 EMA