Date: Fri, 17 May 2002 13:40:17 +0000 From: Stefan Schaer Subject: [IGSMAIL-3887]: TRIMBLE 4700 To: igsmail Message-id: <3CE50841.ED993ABE@aiub.unibe.ch> Organization: Astronomical Institute, University of Berne Sender: owner-igsmail Precedence: bulk ****************************************************************************** IGS Electronic Mail 17 May 06:49:28 PDT 2002 Message Number 3887 ****************************************************************************** Author: Stefan Schaer Dear colleagues: We have developed a reliable method to verify on the basis of RINEX observation data whether a specific receiver type provides (a) C1/P2', (b) P1/P2, or (c) C1/P2 code measurements (see also IGS Mail 3737). Note that C1 stands for C/A code, P2' corresponds to the linear combination C1+(P2-P1). Using this method, we tested data from a considerable number of IGS sites (nearly all sites considered at CODE) and found among other things that Trimble 4700 receivers do actually not belong to receiver class (a) as generally adopted but to class (c). The cc2noncc utility commonly used for correcting P1-C1 bias values should be updated accordingly. In this context, it is worth mentioning that newer generations of class (c), or C1/P2 receivers show dual-frequency code measurements with excellent quality, enabling a very successful widelane ambiguity resolution, even when analyzing differences with P1/P2 measurements (provided that P1-C1 bias values are taken into account). Best regards, Stefan Schaer ----------------------------------------------------------------------- Dr. Stefan Schaer Phone : +41-31-631-8602 (8591) Astronomical Institute Fax : +41-31-631-3869 University of Berne E-mail : stefan.schaer@aiub.unibe.ch Sidlerstrasse 5 FTP : ftp://ftp.unibe.ch/aiub/ CH-3012 Berne http://www.aiub.unibe.ch/download/ Switzerland Web : http://www.aiub.unibe.ch/ ----------------------------------------------------------------------- How does the Earth's ionosphere currently develop? Look at http://www.aiub.unibe.ch/ionosphere.html