| Date: | 2003-08-14 09:22:00 | |
| Sender: | Van S. Husson, ILRS Central Bureau <Husson, Van <Van.Husson@honeywell-tsi.com>> | |
| Subject: | [SLR-Mail] No. 1114: 1864 Maidanak Range Bias Drifting Negative | |
| Author: | Van S. Husson, ILRS Central Bureau | |
| Content: | ******************************************************************************** SLR Electronic Mail 2003-08-14 09:22:00 UTC Message No. 1114 ******************************************************************************** Author: Van S. Husson, ILRS Central Bureau Subject: 1864 Maidanak Range Bias Drifting Negative Dear Colleagues, This message is to alert the analysis community that LAGEOS data from Maidanak-1 (Station 1864) has been drifting negative since at least October 2001 at the rate of approximately -13mm/month. This appears to be a classical clock frequency related problem. The site has been notified, and the source of the error is still under investigation. A frequency error in SLR manifests itself as a range dependent error that will drift over time. The system returned to operations in October 2001 after being off-line for 10 months. Looking back using CSR Weekly LAGEOS results, there are indications a similar problem could have existed at this site the 1st half of the year 2000. In addition, based on meteorological data analysis from Maidanak-1 (1864) and Maidanak-2 (1863), it appears all Maidanak-1 (1864) barometric data prior to October 2001 was reading low by 6 millibars. Any comments can be sent to the ILRS Central Bureau at CB@ilrs.gsfc.nasa.gov From: ”Husson, Van” ******************************************************************************** |