| Date: | 2008-07-17 14:37:00 | |
| Sender: | G. Bianco, V. Luceri <Luceri Cinzia <cinzia.luceri@telespazio.com>> | |
| Subject: | [SLR-Mail] No. 1702: 7941 MLRO range bias in 2007 | |
| Author: | G. Bianco, V. Luceri | |
| Content: | ******************************************************************************** SLR Electronic Mail 2008-07-17 14:37:00 UTC Message No. 1702 ******************************************************************************** Author: G. Bianco, V. Luceri Subject: 7941 MLRO range bias in 2007 Subject: 7941 MLRO range bias in 2007 Subject: 7941 MLRO range bias in 2007 Dear colleagues, starting from the second half of February, 2007, SLR solutions from the ILRS analysis centers have been showing an anomalous behaviour in the MLRO data. The problem was finally traced in a wrong value of a few parameters, which had changed after the MCP/PMT replacement but had not been correctly written into the configuration files. Those parameters are the PMT Gate Start Bias and, consequently, the CFD Gate Start Bias. All MLRO observational data taken in the period between February 16th , 2007 and October 22nd, 2007 are affected by a negative range bias which we have quantified by crossing the time series of system delay measurements with all significant system change events. The following table gives the computed MLRO range bias values for the relevant time intervals. Start (UTC) Stop (UTC) MLRO range bias (mm) 16/02/07 00:00 22/02/07 11:00 -14 +/- 2 22/02/07 11:00 06/07/07 08:00 -28 +/- 2 06/07/07 08:00 30/08/07 00:00 -22 +/- 3 30/08/07 00:00 22/10/07 14:00 -25 +/- 3 These biases must be subtracted from the one-way ranges to obtain the correct value. Details can be found in the document http://ilrs.gsfc.nasa.gov/docs/ASI.2008.07.04.1.pdf , also available through the link on the ILRS web pages http://ilrs.gsfc.nasa.gov/stations/site_info/data_correction/slr_problems_in dex.html Best regards, Cinzia Luceri ATTENZIONE: le informazioni contenute in questo messaggio sono da considerarsi confidenziali ed il loro utilizzo e riservato unicamente al destinatario sopra indicato. Chi dovesse ricevere questo messaggio per errore e tenuto ad informare il mittente ed a rimuoverlo definitivamente da ogni supporto elettronico o cartaceo. WARNING: This message contains confidential and/or proprietary information which may be subject to privilege or immunity and which is intended for use of its addressee only. Should you receive this message in error, you are kindly requested to inform the sender and to definitively remove it from any paper or electronic format. From: Luceri Cinzia ******************************************************************************** |