SIGNAL ESTIMATION DEVICE AND STEERING APPARATUS

To suppress unstable control occurring at the time when a signal cannot be received in a system for executing control using a signal received at discrete time.SOLUTION: A signal estimation device includes a reception section 40 for receiving a variable signal concerning an object variable value at discrete time, and a variable signal estimation section 41 for estimating a variable signal at current time on the basis of a variable signal received in past when the reception section 40 cannot receive the variable signal at current time. The variable signal estimation section 41 includes: a weighting coefficient setting section 50 for setting a weighting coefficient corresponding to a reception status of a variable signal up to the discrete time in past, for each of the received variable signal received at the discrete time in past and a past signal which is a variable signal estimated by the variable signal estimation section 41 in past at the discrete time in past; and weighting approximation sections (51, 52) for calculating a variable signal at current time by weighting approximation for weighting the past signal with the weighting coefficient.SELECTED DRAWING: Figure 3 【課題】離散時刻で受信した信号を用いて制御を行うシステムにおいて、信号を受信できない時刻が発生することにより制御が不安定になるのを抑制する。【解決手段】信号推定装置は、対象の変量の値に関する変量信号を離散時刻で受信する受信部４０と、受信部４０が現在時刻の変量信号を受信できない場合に、過去に受信した変量信号に基づいて現在時刻の変量信号を推定する変量信号推定部４１と、を備える。変量信号推定部４１は、過去の離散時刻において受信された変量信号又は過去の離散時刻において過去に変量信号推定部４１によって推定された変量信号である過去信号の各々に対して、過去の離散時刻までの変量信号の受信状況に応じた重み係数を設定する重み係数設定部５０と、過去信号を重み係数で重み付けする重み付き近似によって現在時刻の変量信号を算出する重み付き近似部（５１、５２）と、を備える。【選択図】図３