This paper describes a receding horizon discrete-time state observer using
the deterministic least squares framework. The state estimation horizon, wh
ich determines the number of past measurement samples used to reconstruct t
he state vector, is introduced as a tuning parameter for the proposed state
observer. A stability result concerning the choice of the state estimation
horizon is established. It is also shown that the fixed memory receding ho
rizon state observer can be related to the standard dynamic observer by usi
ng an appropriate end point state weighting on the estimator cost function.