Abstarct: The importance of recognition and tracking of targets in military and civilian missions not undercover for anybody. This is more important in military missions, as in military missions there are particular limitations for system activity that makes design and making of tracking system and position determination become more difficult. For example, one of the limitations is lose of data from target that can create disorder in proper implementation of the System mission. For instance it is possible with accomplishment manoeuvre of target defense or with notice to special condition of the informations the tracking of the target will lose. In the peresent thesis Kalman filter and function approximation is used to track the target,in which for a part of trajectory is missing. The result shows, the system back to normal position and track the target.