From: "Brian Burke" Date: 18 Nov 1998 22:06:17 Subject: [IGEXMail-0080] GLONASS satellite clock bias anomaly Content-Transfer-Encoding: 7bit X-Priority: 3 (Normal) X-Msmail-Priority: Normal X-Mailer: Microsoft Outlook 8.5, Build 4.71.2232.26 X-Mimeole: Produced By Microsoft MimeOLE V4.72.2106.4 Importance: Normal Sender: owner-igexmail@ensg.ign.fr Precedence: bulk ****************************************************************************** IGEX Electronic Mail 18-Nov-1998 22:06:17 Message No 0080 ****************************************************************************** Author: "Brian Burke" Subject: GLONASS satellite clock bias anomaly To IGEX data users: It appears that there was an anomaly with the broadcast clock parameter values for GLONASS slot 9 on day 321 (17 Nov 1998) beginning 21:32:02 UTC. At this time an off-schedule change in the ephemeris took place replacing the clock bias and clock rate parameters for the SV with incorrect values, producing clock biases in error by ~24,000 meters. These incorrect values remained until the satellite set from out view for the day. The values were correct when the satellite was next visible from our site today, day 322. This an other GLONASS anomalies (mostly affecting navigation users) are listed at http://satnav.atc.ll.mit.edu/ under GLONASS status-> anomalies. Regards, -Brian Brian Burke MIT Lincoln Laboratory