USE OF REDUNDANT GPS RECEIVER TO IMPROVE SITE SYNCHRONIZATION
Original Publication Date: 1999-Sep-01
Included in the Prior Art Database: 2002-Sep-05
Synchronous networks such as the iDEN system use GPS to provide time synchronization of crucial network elements such as the ACG and Base Radios. The ACG contains a GPS receiver whose sole purpose is to use GPS satellites to synchronize the ACG and BRs. GPS satellites broadcast date/time to the receiver, which in turn uses this date/time information to setup its own internal clock to determine current date/time and generate a 1PPS (1 Pulse Per Second) signal that is aligned at the top of each GMT second. The ACG receives date/time information periodically from the receiver for the purposes of setting ACG and BR time. The 1PPS is then used to ensure that the date/time information received from the receiver is set and maintained cor- rectly in both the ACG and BRs.