# On Redundant Observability: From Security Index to Attack Detection and Resilient State Estimation

arXiv: https://arxiv.org/abs/1805.02640 · HTML: https://mlsanity.com/paper/1805.02640/

## Key facts

- Cited by 1 papers in the map (data through 14 Oct 2026).
- First posted on arXiv 7 May 2018.

## Built on by (most cited first, 1 of 1)

- [Robustness to Sparse Adversarial Corruption in Arbitrary Linear Measurements: Beyond Exact Recovery](https://mlsanity.com/paper/2510.24215/) (2025)

## Abstract (arXiv)

The security of control systems under sensor attacks is investigated. Redundant observability is introduced, explaining existing security notions including the security index, attack detectability, and observability under attacks. Equivalent conditions between redundant observability and existing notions are presented. Based on a bank of partial observers utilizing Kalman decomposition and a decoder exploiting redundancy, an estimator design algorithm is proposed enhancing the resilience of control systems. This scheme substantially improves computational efficiency utilizing far less memory.