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USE OF REDUNDANT GPS RECEIVER TO IMPROVE SITE SYNCHRONIZATION

IP.com Disclosure Number: IPCOM000009624D
Original Publication Date: 1999-Sep-01
Included in the Prior Art Database: 2002-Sep-05

Publishing Venue

Motorola

Related People

Authors:
Anatoly Agulnik Gary Soibel

Abstract

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.