LOCATION TRACING SYSTEM

摘要

PURPOSE: The location tracing system is provided to use a small-sized terminal transmitter and a wireless communication network, so as to periodically receive a transmitting signal of the transmitter to track a locations of an object, and to use a battery for a long time. CONSTITUTION: The portable terminal transmitter transmits a signal to a repeater(S1). The repeater transmits the signal with self specific information to a central controller(S3). The central controller checks whether the signal includes an emergency signal(S5). If so, the central controller perceives a location of the transmitter(S51). The central controller notifies an owner or a guardian of an object for being tracked of the location. The central controller drives a protection system(S53). The central controller calls a police station or a crime protection community(S55). If a subscriber inquiries a location of an object for being tracked(S7), the central controller receives a transmitter number and a password from the subscriber(S71). The central controller classifies a signal having the corresponding transmitter number and the password among received signals(S73). The central controller perceives a location of the corresponding transmitter(S75). The central controller supplies location information of the object to the subscriber(S77).