[Submitted on 15 Sep 2026]
Title:Physics-Constrained Digital Twins for Sensor Integrity in Urban Pedestrian Flow: Detecting Stealthy False Data Injection with Conformal Guarantees
View a PDF of the paper titled Physics-Constrained Digital Twins for Sensor Integrity in Urban Pedestrian Flow: Detecting Stealthy False Data Injection with Conformal Guarantees, by Oscar Mogollon Gutierrez and 4 other authors
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Abstract:City pedestrian counting systems now feed economic indicators, planning decisions and safety operations, yet the twins built on top of them treat the incoming stream as ground truth. We study what happens when it is not. We formalise stealthy false data injection for city-scale pedestrian sensing, where the map from latent flow to observation is far more rank deficient than in the power and water networks for which stealth has been characterised. Our twin estimates directed flows on the pedestrian street graph, assimilates counts through a learned graph-localised gain, and is trained against a flow conservation residual that couples metered and unmetered segments. Detection combines the innovation with that residual, and the alarm threshold is set by adaptive conformal calibration rather than by hand. To measure what the physics buys, we define the attack margin, the relative reduction in worst-case corruption of the estimated flow field, achieved against a white-box adversary that optimises directly through the twin. On six years of Melbourne data the margin reaches 0.54 against a single compromised device and falls to 0.19 when a third of the fleet is compromised, on a network where only 1.18 per cent of walkable segments are metered. Replacing the street graph by a distance graph collapses it to 0.09, which shows that the gain comes from the conservation law rather than from locality.
Comments: 16 Pages, 4 Figures, 8 Tables
Subjects:
Artificial Intelligence (cs.AI); Cryptography and Security (cs.CR)
Cite as: arXiv:2609.17635 [cs.AI]
(or arXiv:2609.17635v1 [cs.AI] for this version)
https://doi.org/10.48550/arXiv.2609.17635
arXiv-issued DOI via DataCite (pending registration)
Submission history
From: MohammadHossein Homaei [view email] [v1] Tue, 15 Sep 2026 11:16:21 UTC (156 KB)
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