Abstract: Provided are a target tracking device that efficiently tracks a target, a target tracking method, and a recording medium for storing a target tracking program. This target tracking device comprises a determination condition selector and a tracker. The determination condition selector selects a tracking mode for tracking a detected target from among a plurality of tracking modes on the basis of a group of determination conditions related to the position of the target. The tracker tracks the target in the selected tracking mode. The plurality of tracking modes include a first tracking mode that focuses on the vulnerable portion of the target and a second tracking mode that focuses on the center of gravity of the target. The target tracking device further comprises a coping device that irradiates the focused portion of the target with a laser beam to cope with the target.

Abstract: Provided are a threat-countering system and a threat-countering method for efficiently countering incoming threats by using laser irradiation. The threat-countering system comprises a countering device, a deterrent device, and a decision device. The countering device detects incoming threats and counters the threats by using laser irradiation. The deterrent device is installed to prevent threats from approaching a protected object through a deterrent region in which the power of the laser irradiation is assumed to be lower than a predetermined threshold. The decision device decides the position of the upper end of the deterrent device on the basis of the upper end of the deterrent region.

Abstract: This threat countermeasure system comprises a calculation device and a communication device. The calculation device is configured so as to determine, on the basis of the threat level of at least one target, a countermeasure position of attack on the target. The countermeasure position represents either a first countermeasure position that is attacked in order to temporarily inhibit the function of the target or a second countermeasure position that is attacked in order to stop the function of the target. A first countermeasure period during which the attack is applied to the first countermeasure position in order to at least temporarily inhibit the function of the target may be shorter than a second countermeasure period during which the attack is applied to the second countermeasure position in order to stop the function of the target.