TY - JOUR N2 - An ideal observability subspace expression is stated for bilinear abstract system with bounded operator in Hilbert spaces. The case of finite dimentional space is also treated. However, it’s noticed that the state ideal observability can never be fulfilled within an infinite dimensional phase space in the case of scalar output. The case of bilinear discrete-time system with delays in observation is also described. To illustrate this work some examples are presented. L1 - http://www.journals.pan.pl/Content/109504/PDF/ACS-2018-4-5.pdf L2 - http://www.journals.pan.pl/Content/109504 PY - 2018 IS - No 4 EP - 616 DO - 10.24425/acs.2018.125485 KW - bilinear systems KW - Hilbert spaces KW - ideal observability KW - observability subspace KW - delayed observation A1 - Lhous, Mustapha A1 - Rachik, Mostafa A1 - Magri, El Mostafa PB - Committee of Automatic Control and Robotics PAS VL - vol. 28 DA - 2018.12.17 T1 - Ideal observability for bilinear discrete-time systems with and without delays in observation SP - 601 UR - http://www.journals.pan.pl/dlibra/publication/edition/109504 T2 - Archives of Control Sciences ER -