Search Results for author: Muhammad Umar B. Niazi

Found 8 papers, 4 papers with code

Secure Set-Based State Estimation for Linear Systems under Adversarial Attacks on Sensors

1 code implementation10 Sep 2023 Muhammad Umar B. Niazi, Michelle S. Chong, Amr Alanwar, Karl H. Johansson

When a strategic adversary can attack multiple sensors of a system and freely choose a different set of sensors at different times, how can we ensure that the state estimate remains uncorrupted by the attacker?

Parameterization-Free Observer Design for Nonlinear Systems: Application to the State Estimation of Networked SIR Epidemics

no code implementations7 Apr 2023 Muhammad Umar B. Niazi, Karl H. Johansson

In this paper, we present an observer design approach for estimating the state of nonlinear systems, without requiring any parameterization of the system's nonlinearities.

Resilient Set-based State Estimation for Linear Time-Invariant Systems Using Zonotopes

1 code implementation15 Nov 2022 Muhammad Umar B. Niazi, Amr Alanwar, Michelle S. Chong, Karl Henrik Johansson

This paper considers the problem of set-based state estimation for linear time-invariant (LTI) systems under time-varying sensor attacks.

Computational Efficiency

Robust Data-Driven Predictive Control of Unknown Nonlinear Systems using Reachability Analysis

1 code implementation10 Nov 2022 Mahsa Farjadnia, Amr Alanwar, Muhammad Umar B. Niazi, Marco Molinari, Karl Henrik Johansson

By using the past noisy input-output data in the learning phase, we propose a novel method to over-approximate reachable sets of an unknown nonlinear system.

Secure State Estimation against Sparse Attacks on a Time-varying Set of Sensors

no code implementations10 Nov 2022 Zishuo Li, Muhammad Umar B. Niazi, Changxin Liu, Yilin Mo, Karl H. Johansson

At each time step, the local estimates of sensors are fused by solving an optimization problem to obtain a secure estimation, which is then followed by a local detection-and-resetting process of the decentralized observers.

Learning-based Design of Luenberger Observers for Autonomous Nonlinear Systems

1 code implementation4 Oct 2022 Muhammad Umar B. Niazi, John Cao, Xudong Sun, Amritam Das, Karl Henrik Johansson

Designing Luenberger observers for nonlinear systems involves the challenging task of transforming the state to an alternate coordinate system, possibly of higher dimensions, where the system is asymptotically stable and linear up to output injection.

Data-driven Set-based Estimation of Polynomial Systems with Application to SIR Epidemics

no code implementations8 Nov 2021 Amr Alanwar, Muhammad Umar B. Niazi, Karl H. Johansson

The offline phase utilizes past input-output data to estimate a set of possible coefficients of the polynomial system.

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