****************************************************************************** BSW Electronic Mail 08-Nov-2006 16:55:02 CET Message Number 0229 ****************************************************************************** Author: BSW Team Subject: Model changes at CODE Dear BSW user, the CODE analysis has been switched to the absolute antenna phase model and to the IGS05 reference frame since beginning of GPS week 1400 (last Sunday). At the same time we have improved some other analysis models. In this BSWmail we want to inform you on our changes in the processing and on the corresponding adaptions in your processing to keep the consisteny - as far it is possible - when using the Bernese GPS Software, Version 5.0: Absolute Antenna Phase Pattern: ============================== To enable the use of absolute antenna phase pattern you have to use the files SATELLIT.I05 and PHAS_COD.I05 (see also BSWmail 222 on "ANTEX v1.3 converter and software update"). Both files are available at the location: BSWUSER50/GEN/SATELLITE.I05 and BSWUSER50/GEN/PHAS_COD.I05 at the URL ftp://ftp.unibe.ch/aiub/... respective http://www.aiub.unibe.ch/download/... (Both files are converted from new formatted files that are used in our current development Version 5.1 of Bernese GPS Software.) Remember, that the antenna radom codes are considered, now. IGS05 reference frame: ===================== The IGS05 reference frame was derived from the ITRF2005. The differences between the relative and absolute antenna phase center models are considered (see IGSmail 5447 by R. Ferland on "Proposed IGS05 Realization"). It means, to be consistent with the absolute phase center model you have to exchange not only the two general files (see above) but also the reference frame files: BSWUSER50/STA/IGS_05_R.CRD, BSWUSER50/STA/IGS_05_R.VEL, BSWUSER50/STA/IGS_05.FIX Note, there are some problems to read the ITRF2005_IGS-TRF.SNX file as it was provided by Z. Altamimi. Updating the software according to B93 (B93 at URL http://www.bernese.unibe.ch/Bugs27-JUN-2006.html) includes a new reading routine for SINEX files that fixes this problem. PHASE-WINDUP (POLARIZATION EFFECT): ================================== Starting with GPS week CODE applies the total polarization effect (since September 2003 the geometrical part is considered). This model change has only an impact on the estimated satellite clock. To recover the consistency for a precise point positioning this model change was made available for users of the Version 5.0 in B94 (B94 at URL http://www.bernese.unibe.ch/Bugs27-JUN-2006.html). Note that the total phase windup effect is now also considered in GPSSIM if you simulate you own GNSS data. TROPOSPHERE MODELLING: ===================== CODE uses a new troposphere model (GPT/GMF) for generating the final products starting GPS week 1400. In the rapid solution series this option is already enabled for a few weeks. In consequence, users of the Version 5.0 cannot introduce the troposphere files BSWUSER50/ATM/CODyyddd.TRP anymore. The submission of these files will be stopped. OTHER MODEL CHANGES: =================== Other model changes will have a minor impact on your results. Best regards BSW team [Mailed from: Rolf Dach ]