| Date: | 2005-10-17 18:42:00 | |
| Sender: | Toshimichi Otsubo, NICT <Toshimichi Otsubo <otsubo@nict.go.jp>> | |
| Subject: | [SLR-Mail] No. 1399: bias vs intensity 2004-2005 | |
| Author: | Toshimichi Otsubo, NICT | |
| Content: | ******************************************************************************** SLR Electronic Mail 2005-10-17 18:42:00 UTC Message No. 1399 ******************************************************************************** Author: Toshimichi Otsubo, NICT Subject: bias vs intensity 2004-2005 Dear Colleagues (esp Stations), In Eastbourne, we presented the ´range vs intensity (returns per normal point bin)´ for 20 stations, using half-year SLR data. For completeness, after coming back from UK, we recomputed it using one-year SLR data from Oct 04 to Sep 05. Also, we included 25 stations this time. The updated result is now available at: http://www2.nict.go.jp/ka/control/pod/bias-intensity-0405.pdf The three graphs on the top of each page show the mean of post-fit residuals with respect to the number of returns per normal point bin which is very likely to be related to the signal intensity. Ideally these points should be FLATLY aligned at zero (= no intensity dependence). It is recommended that each station strives to reduce such a systematic range error. Note that this analysis is not 100% (possibly underestimated). Therefore, it is important for stations to perform an ´on-site´ range variation test by changing the optical intensity of satellite-retroreflected pulses coming into the detector. Please have a look at the bottom of Page 3 of http://nercslr.nmt.ac.uk/workshop2005/proceedings/wednesday/sp/Session_SignalProcessing.ppt For more information, please visit the workshop website at NERC: http://nercslr.nmt.ac.uk/workshop2005/workshop2005.html (Proceedings: Wednesday morning) or just email me. Best Regards, Toshi ----- Toshimichi Otsubo Kashima Space Research Center National Institute of Information and Communications Technology phone +81-299-84-7189 facsimile +81-299-84-7160 From: Toshimichi Otsubo ******************************************************************************** |