| 摘要 |
A communication system (105) utilizes the global positioning system (GPS) to maintain a high degree of accuracy of synchronization of base-stations (115-116). When the GPS signal (106, 107, or 108) is absent, the communication system (105) employs an alternate signal (110-113), such as a WWVB, LORAN-C, and MSF signal, to provide redundant synchronization of the base-stations (115-116). To achieve the degree of synchronization accuracy provided by the GPS signal (106-108), the communication system (105) characterizes the alternate signal (110-113) by utilizing the GPS signal (106-108) when the GPS signal (106-108) is present. When the GPS signal (106-108) is absent, the characterized alternate signal is then employed such that synchronization of the base-stations (115-116) is transparent to the base-stations (115, 116). Use of the GPS signal (106-108) to characterize the alternate signal (110-113) also allows the characterized alternate signal to provide the same degree of accuracy as that of the GPS signal (106-108).
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