Update of the SATELLIT. File and the ANTEX (v1.3) Converter, Consideration of Receiver Antenna Radome Codes  Contents
1.Introduction 2 1.1.Files Available for Download (2)
1.1.1.Files available from IGS (2)
1.1.2.Files available from CODE/AIUB (3)
1.1.3.Antenna Information for Newly Launched GNSS Satellites (3)
1.2.Handling of Receiver Antenna/Radome Code Combinations by the IGS (4)
2.How to Update Your Software Version 5 2.1.Software Update (5)
2.2.Recommended BPE Update (5)
3.Upgraded ANTEX Converter PHCCNV 6 3.1.General Description (6)
3.1.1.Input and Result Files (8)
3.1.2.Program Output (8)
3.1.3.Warning and Error Messages (8)
3.1.4.GLONASS Receiver Patterns (9)
3.1.5.PCV Model Name for SINEX (9)
3.1.6.Receiver Antenna Numbering (9)
3.2.Examples (10)
3.2.1.Update of (Currently Used) Bernese PCV File (10)
3.2.2.Creation of a Completely New Bernese PCV File from an ANTEX File10
3.2.3.Enlargement of the Bernese PCV File with Missing Antenna Radome
Combinations (11)
3.2.4.Elevation-Dependent PCVs only (12)
3.2.5.Merging of Individually Calibrated Antennas (12)
3.2.6.Conversion of a Relative to an Absolute Bernese PCV File (13)
3.2.7.Handling of Antennas Without Radome Code (13)
3.3.Routinely Running PHCCNV (14)
3.4.Problematic Antenna Radome Combinations in Relative Case (14)
4.How to Switch to the New Set of Files 16 4.1.Switch from Currently Used Old PCV File to New Relative File (16)
4.2.Switch from Relative Files to Absolute Files (17)
4.3.Routinely Updating Phase Pattern File(s) (19)
4.4.Summary of BSW File Names (19)
Bern, 20 July 2006 Contact address: bernese@aiub.unibe.ch
1. Introduction
Absolute receiver antenna phase patterns from robot calibrations are getting available. When using absolute receiver antenna PCV (Phase Center Variations) in regional network analysis, it is necessary to use absolute calibrations for the satellite antennas, too. Within the IGS such patterns were computed for the active GNSS satellites and are made available. A new version of the antenna information exchange format ANTEX, version v1.3, was developed for this purpose. The IGS intends to perform the switch to absolute antenna patterns in autumn of 2006, together with the switch to ITRF2005.
The planned changes concerning the use of the antenna models within the IGS include:• absolute Phase Center Variations (PCV) for receiver antennas,
• use of nadir dependent PCV for the satellite antennas (one common nadir dependent PCV for each block, individual Z-antenna offsets for each satellite), • consideration of the receiver antenna radome codes (as far as the antenna radome combination has been calibrated).
The first two changes dependent on each other: absolute receiver antenna patterns have to be used in conjunction with absolute satellite antenna patterns.
Because of the upgraded version of ANTEX and the upcoming absolute antenna models in the IGS,
some small, but important changes have to be done by the users of the Bernese GPS Software, V5.0.
After providing some general information this README first lists the necessary steps for updating your Bernese GPS Software version (Section 2), gives then a detailed description of the new ANTEX converter including a number of useful examples (Section 3), and finally lists the steps that are necessary to switch to the new set of files and, later, to absolute phase patterns (Section 4).
Note that until the new IGS absolute antenna model is officially adopted, there is no need to apply the changes described in this README file. The changes are, however, necessary in order to use the upgraded ANTEX converter. In addition, they are a good preparation for switching to the upcoming absolute antenna model.
1.1. Files Available for Download
1.1.1. Files available from IGS
For the planned changes, a new absolute ANTEX file is already available from the IGS at URL:  ftp://igscb.v/pub/station/general/pcv_proposed/
filename:  igs05_wwww.atx    (latest version, igs05_1365.atx)
The "wwww" indicates the GPS week of the creation of the file. More updates
of the file are likely to be issued, e.g., when a new antenna radome
combination is added.
IGS Mail: igscb.v/mail/igsmail/2006/msg00041.html.
The information concerning absolute antenna phase patterns were compiled by Ralf Schmid at Technical University Munich into one ANTEX file on behalf of the IGS.
AIUB
A relative ANTEX file,igs_01.atx, is available at URL ftp://igscb.v /pub/station/general/ containing the same information as given in igs_01.pcv.
1.1.
2. Files available from CODE/AIUB
From AIUB/CODE's anonymous ftp server (URL: www.aiub.unibe.ch/download/ BSWUSER50/GEN or ftp://ftp.unibe.ch/aiub/BSWUSER50/GEN), several files are available for supporting the switch to the new format as well as the maintenance of the corresponding files by the user. These files are
• containing satellite-specific information, in particular satellite-specific antenna offsets that need to be consistent with the corresponding satellite antenna phase patterns,
• containing the phase center information of the antennas processed by CODE.
The extension xxx of the above files is
• xxx = I01 for files containing relative antenna information based on the IGS ANTEX file igs_01.atx,
absolute relative
• xxx = I05 for files containing absolute antenna information based on the IGS ANTEX file igs05_wwww.atx.
For the switch to the new set of files and to absolute antenna phase patterns you have to download the satellite information files. It is recommended to follow a similar naming convention (as used at CODE) for your files, i.e., indicating the PCV model type with the extension.
In principle you might use CODE's Bernese PCV files () as long as you do not consider additional antenna radome combination in your analysis. It is, however, recommended to use the upgraded ANTEX converter to generate your own Bernese PCV files (see Section 3). The converter allows you to transfer information for your list of antennas included in your current Bernese PCV file.
IMPORTANT: Satellite information and phase pattern files form entities that have always to be used together throughout your processing in order to guarantee a consistent use of satellite/receiver antenna offsets and patterns. Make sure to never mix files with extensions *.I01 and *.I05.
Two additional files are regularly made available by AIUB/CODE that support you in including the information for new satellites, see following Section 1.1.3.
1.1.3. Antenna Information for Newly Launched GNSS Satellites
The new Bernese PCV files require entries for all satellites. In order to make corresponding information available before tracking data of brand new satellites gets available, AIUB/CODE maintains two ANTEX files (I01.ATX and I05.ATX) and makes them available at URL www.aiub.unibe.ch/download/BSWUSER50/GEN or ftp://ftp.unibe.ch/aiub/ BSWUSER50/GEN.
At the time of a satellite launch no estimated satellite antenna offsets are available for this satellite and the corresponding entry is missing in the official ANTEX (e.g.; igs05_1365.atx)
Bernese GPS Software Version 5.0
as well as in the Bernese PCV file. Without this entry in the Bernese PCV file any further processing will be aborted.
The ANTEX files (I01.ATX and I05.ATX) provided at AIUB's anonymous FTP server contains mean values of the same satellite type for a newly launched satellite. Apart of values for new satellites, this ANTEX file is identical to the official ANTEX file. After estimation of official satellite antenna offsets the IGS distributes an updated ANTEX file. From that moment on the ANTEX file at our anonymous FTP will again be identical to the official ANTEX file from IGS.
1.2. Handling of Receiver Antenna/Radome Code Combinations by
the IGS
Note that with the change within the IGS, antenna radome codes must be used rigorously (radome code in Bernese GPS Software = last four characters of antenna name, e.g., NONE, DOME, SNOW,
etc.). The ANTEX files listed above do, however, not contain all possible antenna radome combinations. For missing combinations the IGS decided to copy the values of the same antenna without radome, e.g., if “AOAD/M_T        DOME” is missing
"AOAD/M_T        DOME"  copied from  "AOAD/M_T        NONE".
AIUB
2. How to Update Your Software Version
2.1. Software Update
The Bernese GPS Software, Version 5.0, requires only a few small modifications to cope with the foreseen changes concerning absolute phase patterns. Program PHCCNV that converts files from ANTEX v1.3 to Bernese formatted PCV files needs to be updated. In addition, an update of the satellite information file is necessary. The update of four subroutines (READSIN.f90, SINSTORE.f90, RDSTACRX.f90 and CHKSIN.f90) of ADDNEQ2 is needed for a correct consideration of receiver antenna radome codes. The MAXRCV parameter in GPHECC.f needs to be increased because of the increased number of antennas. To activate the changes for correct consideration of receiver ante
nna radomes and to activate the updated program PHCCNV the following step has to be performed:
• Update your software to the current release level (at least “27-Jun-2006”). Please follow the instructions given in BSW Mail #0215 and URL www.bernese.unibe.ch/ support.html to run the update tool.
This update includes several bug fixes and improvements that were implemented since the previous release “09-Mar-2006”. Please follow all instructions during the update process. Do not forget to finalize the update process by updating the program panels PHCCNV.INP and ADDNEQ2.INP in the directory “$U/PAN” (%U%\PAN for windows) resp. the BPE option directories $U/OPT/* (%U%\OPT\* for windows).
You may use the menu: Configure >Update input files for the panel update.
2.2. Recommended BPE Update
In order to allow for an efficient switch between relative and absolute PCVs (and in future, to follow further PCV model updates) in the BPE, it is recommended to use a BPE variable V_PCV for the file extensions: Change the names of the satellite information file in all program panels of the option dire
ctories ($U/OPT and$X/OPT) SATELLIT.$(PCV) and of the Bernese PCV file from PHAS_IGS.REL (or PHAS_ccc.REL)to PHAS_ccc.$(PCV). The string “ccc” is an arbitrary three character abbreviation, e.g., identifying your institution.
You may use the menu: Configure >Change general options.
Define the V_PCV variable in all PCF-files by including the line:
“V_PCV    GNSS PCV MODEL                          I01” (or “I05”) in the last section (BPE variables). You may either use an ASCII editor or the menu: BPE >Edit process control file (PCF). By using a variable for the file extension you are well prepared for any further update of the antenna model.
Bernese GPS Software Version 5.0

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