PURPOSE: To clearly grasp a target state by correlationally processing the angle tracks from a plurality of target observation devices and a plurality of angle tracking devices and calculating the distances from the observation devices to a target and the change ratios thereof to calculate the tracks of the respective observation devices in three- dimensional space.
CONSTITUTION: The vectors and error evaluation quantities of angle tracks are calculated from the detection data calculated by target observation devices 1,5 by angle tracking devices 2,4. The correlational processing of the angle tracks due to the position of a target is performed by a target position correlation device 6 and the distances from the devices 1,5 to the target and the change ratios thereof are calculated by a target distance calculator 7 and a distance change ratio calculator 9. The initial values of the tracks in the three-dimensional polar coordinates based on the device 1,5 are calculated on the basis of the angle tracks by polar coordinate initializing calculators 11,15 and the initial values of the tracks of the orthogonal coordinates are calculated by orthogonal coordinate initializing calculators 12,16. On the basis of these values and the detection data, three-dimensional tracking devices 13,17 calculate the vectors and error evaluation quantities of the tracks in three-dimensional orthogonal coordinates at every sampling time. This operation is repeated up to the completion of tracking to display tracks on display devices 14, 18.
KOSUGE YOSHIO
HAYASHI MICHIKO
