Journal
INTERNATIONAL JOURNAL OF CONTROL
Volume 77, Issue 8, Pages 723-734Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/00207170410001715040
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There exists a class of non-linear systems which cannot be transformed into non-linear observer form via diffeomorphism, but can be immersed into higher dimensional non-linear observer form. This paper investigates when n dimensional non-linear systems can be immersed into (n + m)-dimensional non-linear systems in non-linear observer form, and provides a necessary and sufficient condition. We also present an algorithm to check the immersibility. In general, at the first step of the algorithm, one should solve a differential equation with m + I unknowns rather than solving one with n + m unknowns simultaneously. When a solution to the differential equation can be obtained, the immersibility can be checked by a recursive algorithm. Moreover, when 2m less than or equal to n, a straightforward algorithm is provided to check the immersibility.
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