Hong Lin as been awarded the status first of Excellent Student in Zhejiang University and then of Excellent Educator in Concord College Fujian Normal University. He is an active reviewer for many international journals.Hongye Su is the author of 100 journal papers and 8 books. He has undertaken more than ten national funds and state key projects as the principal investigator, including National Outstanding Youth Science Foundation of China, National Natural Science Foundation of China, Teaching and Research Award Program for Outstanding Young Teachers in Higher Education Institutions of MOE, PRC, and projects for National High Technology Research and Development Program of China (863 Program), etc.Peng Shi has actively served in the editorial board of a number of journals, including Automatica, IEEE Transactions on Automatic Control; IEEE Transactions on Fuzzy Systems. He is a Fellow of the Institution of Engineering and Technology, and the Institute of Mathematics and its Applications. He was the Chair of Control Aerospace and Electronic Systems Chapter, IEEE South Australia Section; and now he is Member of College of Expert, Australian Research Council. He serves as an IEEE Systems, Man and Cybernetics Society Distinguished Lecturer for 2016-2017.Zhan Shu is an Associate Editor for the Journal of The Franklin Institute, Asian Journal of Control, and Mathematical Problems in Engineering. He is a member in the editorial board of the Open Automation and Control Systems Journal and IEEE Control Systems Society Conference. Zheng-Guang Wu currently serves as an Associate Editor for IEEE Access and an Editorial Board Member for Neurocomputing. He is a very active reviewer for many international journals.

• Introduction.- Optimal Estimation and Control for UDP-Like Systems.- An Auxiliary Estimator Method.- Stability and Convergence of optimal Estimator for UDP-Like Systems.- Auxiliary-Estimator-Based Suboptimal Estimators for UDP-Like Systems.