초록 ▼

A system for rapidly acquiring a time reference for the location determination of a wireless communication device. The system includes a wireless communication device (200), a GPS satellite (202) and a communication satellite (208). The method comprises the steps of acquiring a communication satelli

A system for rapidly acquiring a time reference for the location determination of a wireless communication device. The system includes a wireless communication device (200), a GPS satellite (202) and a communication satellite (208). The method comprises the steps of acquiring a communication satellite signal (210) and using the finite frame time to establish a course time reference. Once the course time reference is established, an absolute device time is determined by the wireless communication device, which as a result is synchronized to the absolute time of the communication satellite (208) to within ten milliseconds. The absolute device time is then used to synchronize the GPS portion of the wireless communication device with the GPS satellite system.

대표청구항 ▼

[ What is claimed is:] [1.]1. A portable communication device comprising:a first satellite receiver for receiving a first satellite signal, said first satellite signal, in the form of a beam having a beam center, includes a first satellite data stream, formatted into finite time frames sequentially

[ What is claimed is:] [1.]1. A portable communication device comprising:a first satellite receiver for receiving a first satellite signal, said first satellite signal, in the form of a beam having a beam center, includes a first satellite data stream, formatted into finite time frames sequentially transmitted, said finite time frames include an absolute satellite time and a frame time associated with said absolute satellite time, a first satellite ephemeris data, and beam center data;a microprocessor coupled to said first satellite receiver for extracting said absolute satellite time from said first satellite data stream to generate a absolute device time that is synchronized with said absolute satellite time,wherein said absolute satellite time and said absolute device time have a time reference ambiguity associated therewith; anda Global Positioning System (GPS) receiver coupled to said microprocessor for receiving said absolute device time from said microprocessor and using said absolute device time to synchronize said GPS receiver with at least three GPS satellites and further calculating a location therefrom.