Date: Mon, 30 Jul 2007 14:22:04 -0400 From: "Jim.Ray" Subject: [IGSMAIL-5623]: GPS control segment upgrade To: igsmail@igscb.jpl.nasa.gov, CANSPACE@LISTSERV.UNB.CA Message-id: <46AE2C4C.6050407@noaa.gov> Content-type: text/plain; charset=ISO-8859-1; format=flowed Content-transfer-encoding: 7bit User-Agent: Thunderbird 1.5.0.12 (Windows/20070509) Sender: owner-igsmail Precedence: bulk ****************************************************************************** IGS Electronic Mail 30 Jul 11:22:06 PDT 2007 Message Number 5623 ****************************************************************************** Author: Jim Ray (forward to GPS users) The U.S. Air Force has announced that a major upgrade is planned for the GPS control segment (referred to as the Architecture Evolution Plan, or AEP). AEP will swap out the entire master control station, which uses a 1970s-era legacy system, to a modern design based on current technology. Among other things, this change is required in order to implement new capabilities, such as the next generation of IIF satellites. The AEP change is scheduled to occur during the second week of September, over a period of 4-6 days. The transition will phase in a few satellites at a time and will be completely reversible if anything goes wrong. Before it begins, the old and new ground control systems will be synchronized to the millimeter level so that the most demanding users will experience a seamless change. The civil community has been asked to disseminate the word about the upcoming change as widely as possible. Should any anomalies be detected during the transition period, users should follow the normal notification procedures via the U.S. Coast Guard Navigation Center (www.navcen.uscg.gov).