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Alex Zongo

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Runtime Safety Filtering for Learned Small UAS Separation Policies under GNSS Degradation

Experimental results show that action filtering provides negligible safety improvement, while observation filtering reduces near mid-air collisions by 90% and remains robust to the barrier function's tradeoff between separation distance and closing rate, and suggest that preserving the policy's decision authority outperforms overriding its actions with hand-designed constraints.

Alex Zongo, Peng Wei · 0 citations

Robust Multi-Agent Reinforcement Learning for Small UAS Separation Assurance under GPS Degradation and Spoofing

This work derives a closed-form expression for this adversarial perturbation, bypassing the iterative inner optimization of adversarial training entirely and enabling linear-time evaluation in the state dimension, and shows that this expression approximates the exact minimizer of the value function over the modeled uncertainty set with second-order accuracy.

Alex Zongo, Filippos Fotiadis, U. Topcu et al. · 1 citation

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