The noise covariances of linear Gaussian systems with unknown inputs are not uniquely identifiable using autocovariance least-squares. - He Kong; Salah Sukkarieh; Travis J. Arnold; Tianshi Chen 001; Wei Xing Zheng 001 (Syst. Control. Lett., 2022)

Tractable Calculation and Estimation of the Optimal Weighting Matrix for ALS Problems. - Travis J. Arnold; James B. Rawlings (IEEE Trans. Autom. Control., 2022)

Identifiability Analysis of Noise Covariances for LTI Stochastic Systems With Unknown Inputs. - He Kong; Salah Sukkarieh; Travis J. Arnold; Tianshi Chen 001; Biqiang Mu; Wei Xing Zheng 001 (IEEE Trans. Autom. Control., 2023)