1. A target tracking device comprising: a passive sensor processing unit configured to calculate passive track of a target based on passive measurement of the target angle measured by a passive sensor; an active sensor processing unit configured to calculate active track of the target based on active measurement of the target distance and angle measured by an active sensor; a data fusion unit configured to combine the passive track and the active track and outputs a combined track when the passive track and the active track are from same target; and a correction unit configured to calculate correction data based on the combined track, wherein the passive sensor processing unit calculates track of the target for each of a plurality of motion models based on the passive measurement and the correction data, and calculates the passive track by weighted sum of all tracks for the motion models.