An annihilation matrix generalization of the measurement difference method estimates state and measurement noise covariances for unobservable linear time-varying systems with unknown inputs.
Variational adaptive Kalman filter with Gaussian-Inverse-Wishart mixture distribution,
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Unobservable Systems: No Problem for Noise Identification
An annihilation matrix generalization of the measurement difference method estimates state and measurement noise covariances for unobservable linear time-varying systems with unknown inputs.