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Simultaneous Input and State Estimation under Output Quantization: A Gaussian Mixture approach

Simultaneous Input and State Estimation (SISE) enables the reconstruction of unknown inputs and internal states in dynamical systems, with applications in fault detection, robotics, and control. While various methods exist for linear systems, extensions to systems with output quantization are scarce, and formal connections to limit Kalman filters in this context are lacking. This work addresses these gaps by proposing a novel SISE algorithm for linear systems with quantized output measurements that is based on a Gaussian mixture model formulation. The observation model is represented as a Gaussian sum density, leading to closed-form recursive equations in the form of a Gaussian sum filter. In the absence of input prior knowledge, the recursions converge to a limit-case SISE algorithm, implementable as a bank of linear SISE filters running in parallel. A simulation example is presented to illustrate the effectiveness of the proposed approach.

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