High Resolution 802.11ax-based Passive Radar for Human Movement Monitoring

Yildirim, Hasan Can; Storrer, Laurent; Rottenberg, François; Louveaux, Jérôme; Doncker, Philippe De; Horlin, François

doi:10.1109/eurad48048.2021.00111

Cited by 1 publication

(3 citation statements)

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“…The parasitic exploitation of WiFi transmissions for short range sensing is a topic that recently attracted considerable research and commercial interest [1][2][3][4][5][6][7][8][9][10][11]. In fact, the ubiquity of WiFi Access Points (APs) in both private and public premises would enable a distributed sensing network aimed at the monitoring of human activity for surveillance purposes as well as for e-healthcare applications, without raising any privacy concerns, as it would be the case for cameras and/or wearable devises.…”

Section: Introductionmentioning

confidence: 99%

“…In Refs. [1][2][3][4][5][6][7][8][9][10][11] and related works, the suitability of WiFi signals as waveforms of opportunity for PR has been investigated and appropriate signal processing strategies have been proposed for detecting and localising moving targets against the competing background, namely the direct signal from the transmitter, its multipath replicas, and the receiver noise. The effectiveness of such approaches has been proved in several experimental tests against drones, vehicles, and people.…”

Section: Introductionmentioning

confidence: 99%

“…A similar approach was used in Refs. [10,11,15] and shown to allow reasonable radar performance. Specifically, it allows to achieve detection performance similar to a PR scheme that exploits a quite good reference signal, despite a limited loss in terms of SNR.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Comparing reference‐free WiFi radar sensing approaches for monitoring people and drones

Di Seglio,

Filippini,

Bongioanni

et al. 2024

IET Radar Sonar & Navi

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The use of WiFi signals for sensing purposes has attracted a lot of interest from both the radar and communications communities and several techniques have been explored. In the attempt of meeting the requirements for small sensor size, compactness, and easy deployment, the authors consider reference‐free approaches, namely approaches that do not require a good copy of the transmitted waveform to be available at the radar receiver. To this end, the authors first resort to a passive radar‐based processing scheme that only exploits the invariant a priori known initial portion of the physical layer protocol data unit, that is, the PHY Preamble, and its limitations in practical applications is investigated. Specifically, the authors show that, with this approach, an accurate time, phase, and frequency synchronization is essential and a possible strategy is investigated. As an alternative solution the authors consider a forward scatter radar‐based approach where only the amplitude modulation of the received signal is exploited to detect the presence of a moving target thus avoiding the need to know the transmitted signal. For the first time, the authors comparatively investigate advantages and drawbacks of the two reference‐free approaches and present practical strategies to handle the limitations observed. The results are reported for experimental tests with people and drones using WiFi transmissions in the 2.4 and 5 GHz band.

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