Parasitic Exploitation of Wi-Fi Signals for Indoor Radar Surveillance

Abstract

In this paper we examine the potentiality of passive coherent location (PCL) for indoor area monitoring. In particular we show that WiFi transmissions can be successfully exploited as waveforms of opportunity to perform moving target detection and localization based on the passive radar principle. Moreover, we investigate the advanced capability to obtain high resolution crossrange profiles of the observed targets via Inverse Synthetic Aperture Radar (ISAR) techniques. To these purposes, appropriate processing techniques are introduced to cope with the limitations resulting from the indoor application such as the strong returns from the stationary scene and the high density of potential targets. The proposed system concept has been tested against both simulated and real data sets. The reported results clearly show that using few receiving channels connected to properly dislocated antennas allows an accurate target localization and tracking. In addition reliable and stable profiles are obtained for the targets moving in the surveyed scene which might fruitfully feed a classification stage. This contributes to demonstrate the effective applicability of the passive radar concept for improving internal and external security of private/public premises.

Security enhancement in small private airports through active and passive radar sensors

“…The WiFi-based passive radar processing scheme reported in [8] is applied against the collected surveillance signals separately at each channel. In particular, the removal of undesired contributions is performed with the sliding version of the extensive cancellation algorithm (ECA-S), [9], over a range of 600 m with a batch duration equal to 0.2 s whereas the filter update rate is equal to the beacon emission rate of the exploited AP.…”

Introduction of low probability of recognition to radar system classification

“…Again, mobile communications transmitters been used for PCL systems [30], [31], thereby demonstrating the feasibility of these waveforms for radar design. The code-division multiple access (CDMA) modulation scheme used by a number of mobile communications standards (e.g.…”

Ground Moving Target detection Based on MIMO SAR systems

“…However, such case can be faced by means of the application of conventional weighting functions for sidelobe control accepting, as well known, a degradation in resolution and peak signal to disturbance power ratio. Moreover, to cope with very strong targets causing serious masking effects, CLEAN-based techniques could also be used [34], [35].…”