Dasgupta, SouraAnderson, Brian D.O.John Kaye, R.2026-01-012026-01-010005-1098ORCID:/0000-0002-1493-4774/work/174739534https://hdl.handle.net/1885/733801432This note derives persistence of excitation conditions on the input for systems with partially known transfer functions. The assumed transfer function model is [p0(s) + KTP(s)] [q0(s) + KTQ(s)], where K is the unknown parameter vector p0(s), q0(s) are known scalar polynomials and P(s) and Q(s) are known vector polynomials.4enadaptive identificationidentifiabilitylinear systemsPersistent excitationsufficient richness199410.1016/0005-1098(94)90136-80028396809