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Question

What earth rotation (pole) information should I use when processing data? How do I incorperate this data into the Bernese processing software?

Answer

When using precise ephemeris products (predicted, rapid and final orbits) from say the IGS, CODE, or another one of the IGS analysis centers, there should be an accompanying earth rotation file (ERP) with the orbit files. It is highly recommended that the ERP file associated with the orbit be used for processing. Typically, this ERP file is written in the IERS pole format. An example of this type of pole file is given below: 

Source: Xpole,Ypole,Xrt,Yrt,LOD: weighted average of centres;
        UT1-UTC: integrated from the 5th day prior to Bull. A
                 last non-predicted value.

Orbits: to be used with the IGS Final Orbits

  MJD      Xpole Ypole UT1-UTC   LOD Xsig Ysig  UTsig LODsig  Nr Nf Nt   Xrt   Yrt Xrtsig Yrtsig
            (10**-5")    usec   usec (10**-5")   usec   usec           (10**-5"/d)  (10**-5"/d)
50733.50  22364  34853  368349  2405    8   11     36      9   0  0  0   105  -258    16    10
50734.50  22446  34606  365884  2550    7   13     15     12   0  0  0    48  -255    10    13
50735.50  22485  34349  363340  2578    9   13     15      7   0  0  0    41  -274    19    10
50736.50  22539  34084  360727  2595    9   11     11     10   0  0  0    55  -264     5    15
50737.50  22579  33813  358171  2516   10   15     11      7   0  0  0    14  -263    11    16
50738.50  22595  33531  355737  2382    9   12     10      7   0  0  0    13  -301    13     5
50739.50  22612  33232  353457  2177   11   13     12      9   0  0  0    13  -292    18    17

Use the POLUPD program accessed in panel 5.5.1 of the menu system to convert the IERS pole file into a pole file written in Bernese format. A few comments when converting these earth orientation files and the program POLUPD.

  • The input files should be in the $X/GEN directory (unless defined other wise in the DAT031__.PAN).
  • The files in the IERS format should have the IEP suffix. This means that after the files have been retrieved from an IGS center, they will need to be renamed (since the suffix at the IGS centers is ERP).
  • The output files will have the suffix ERP.
  • The POLUPD program does not append to an existing file, it overwrites it.
When using broadcast ephemeris messages, it is suggested that you use the IERS bulletin A or bulletin B values. These earth orientation parameters from the bulletin A are available in Bernese pole file format on the Univeristy of Berne's anonymous ftp area. They can be accessed with the following information: 
	ftp:	  ubeclu.unibe.ch (or 130.96.6.11)
	login:	  anonymous
	passwd:	  your full e-mail address
	location: cd aiub$ftp
		  cd BSWUSER
		  cd GEN 
		  get RAP_YYYY.ERP  (YYYY is the year number ex. 1997)
The bulletin A files in bernese format (RAP_YYYY.ERP) do not need to be converted for use. They can be used, as is, in the Bernese processing.

The ERP files should reside in the directory $X/GEN. The specific pole file to be used is defined in panel 0.3.1. 

+---------+--------------------------------------------------------------------+
|  0.3-1  |                DEFAULTS: GENERAL DATASET NAMES                     |
+---------+--------------------------------------------------------------------+
|  General Datasets:                                                           |
|    GEODETIC DATUM     > DATUM.       <    CONSTANTS         > CONST.       < |
|    PHASE CENTER ECC.  > PHASITRF.    <    RECEIVER INFO     > RECEIVER.    < |
|    EARTH POTENTIAL    > GEMT3.       <    POLE INFORMATION  > RAP_1997.ERP < |
|    POLE OFFSET COEF.  > POLOFF.      <    LEAP SECONDS      > GPSUTC.      < |
|    SAT. PARAMETERS    > SATELLIT.TTT <    MANOEUVERS ETC.   > SAT_1997.CRX < |
|    SINEX GENERAL FILE > SINEX.       <    STATION PROBLEMS  > STACRUX.     < |
|  Extensions:                                                                 |
|    IERS BULLETINS     > IER <      RCVR/ANT.NAME TRANSLATION TABLES  > TRN < |
|                                                                              |
|  Path to the Datasets:           > X:/GEN/                  <                |
|  Input Files:                      Path                         Extension    |
|    N-,I-,F-FILES                 > U:/INP/                  <    > INP <     |
|    SKELETON FILES                > X:/SKL/                  <    > SKL <     |
|    PANEL UPDATE DIRECTORY LISTS  > X:/SKL/                  <    > UPD <     |
|                                                                              |
|  Auxiliary Files (Scratch Files) > U:/WORK/                 <    > SCR <     |
|  Error Message File (Full Name): > U:/WORK/ERROR.MSG                <        |
+------------------------------------------------------------------------------+

NOTE: Each option directory for the BPE has it's own DAT031__.PAN file. When running the BPE, the pole file has to explicitly be set in each of the option input directories (in directory $U/OPT/).


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Last modified Thursday, 17-Nov-2005 03:58:00 UTC
 

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