LOCATION DETECTION SYSTEM

摘要

To increase the accuracy by which the location of an object can be determined, the present invention combines the accuracy of a GPS receiver (54) with a two-way paging system (68). A two-way pager (56) receives information indicative of the position of a GPS receiver (54) and transmits the information on a reverse channel to a paging service (68). The information is forwarded to a location determination service (64) that, if possible, converts the information into a location of the object. The location information may be given to a requestor that accesses the location determination service (64) via a computer (124), telephone (126), or other two-way communication device. Upon receiving a request, the location determination service (64) causes a page to be transmitted to the two-way pager (56) in order to have the two-way pager (56) return the information indicative of the position of the GPS receiver (54) on a reverse paging channel, which is then returned to the location determination service (64) for access by a requestor. In one embodiment of the invention, the requestor is a cellular call processor (18) and the object is a cellular telephone (50). The location information is used by the cellular call processor (62) to direct an emergency call to the appropriate emergency agency (80, 82) as well as to provide emergency personnel with a map showing the location of the caller.