Estimation of multiple frequency & phase using observer and estimator

In signal & system, designing and development of off-line and on-line estimator is the basic problem. The recent advancement in control system developed on-line frequency estimators in various operations. The complication in estimating unknown frequencies of a complex sinusoidal signal simultaneously is our basic research purpose. In our work, different estimators are analyzed on the basis of on-line estimation. The presented estimators ensure a continuous time on-line simultaneous frequency estimation, which guarantees global boundedness and convergence of the state and frequencies estimation for all initial conditions and frequencies.