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Bernese GPS Software Version 5.0 - Bernese GNSS Software

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22. Data Structure<br />

AJAC<br />

$$ FES2004 PP ID: Feb 10, 2006 14:06<br />

$$ Computed by OLMPP by H G Scherneck, Onsala Space Observatory, 2006<br />

$$ AJAC, RADI TANG lon/lat: 8.7626 41.9275<br />

.00565 .00216 .00123 .00051 .00228 .00108 .00074 .00011 .00037 .00020 .00016<br />

.00235 .00067 .00055 .00017 .00029 .00015 .00009 .00003 .00003 .00002 .00002<br />

.00108 .00038 .00019 .00010 .00019 .00007 .00006 .00004 .00002 .00001 .00000<br />

-65.2 -36.3 -83.7 -49.4 -43.5 -86.5 -44.7 -85.4 1.5 3.6 0.6<br />

74.4 105.8 53.1 95.5 124.9 34.1 121.9 -58.8 -178.5 -164.9 -177.0<br />

-67.7 -29.1 -89.7 -37.2 39.8 118.1 37.5 132.7 -112.4 -156.5 -162.4<br />

Figure 22.38: Ocean tidal loading (BLQ) file. Excerpt of one station-specific block.<br />

Used by: <strong>GPS</strong>EST (”Menu>Processing>Parameter estimation”), <strong>GPS</strong>SIM (”Menu>Service>Generate<br />

simulated observation data”), and CLKEST.<br />

Example: Block for site AJAC in Figure 22.38. An example is also available in<br />

${X}/DOC/EXAMPLE.BLQ and in the anonymous BSW ftp area (see Section<br />

4.12).<br />

This table may optionally be used in program <strong>GPS</strong>EST, <strong>GPS</strong>SIM, and CLKEST in order<br />

to take into account the effects on site coordinates due to ocean tide loading. It contains<br />

station-specific amplitudes and phase of the eleven largest tidal constituents for the vertical<br />

as well as for the horizontal station components. The format is the “de facto” IERS standard.<br />

Use the web-service at http://www.oso.chalmers.se/~loading/ to get a table of the<br />

ocean loading coefficients for your stations. Copy the coordinates to the input field of the<br />

web-page. For the <strong>GNSS</strong> analysis you need the vertical and horizontal displacement, no<br />

corrections for the center of mass motion have to be applied. After submitting the job you<br />

will get the ocean loading file by e-mail. Only approximate site coordinates are required.<br />

Compute a new set of coefficients for stations that are separated by more than 10 km.<br />

You have to save these information in a file with the extension BLQ in your campaign’s<br />

STA-directory or append it to an already existing file (for efficiency compute coefficients<br />

only for stations for which you do not already have the information).<br />

The reading routine ${LG}/GTOCNL.f checks only the first four characters of the station<br />

name to find the coefficients in the file if the station 4-character abbreviation in the first and<br />

the fourth line of a station block in the file are equal (see Figure 22.38). If the name entries<br />

are different, the two names are concatenated (assuming that the second entry contains<br />

the station domes number) and compared to the full name of the station for which the<br />

coefficients are requested. The routine is called once per station in a program run. The<br />

coefficients are buffered for each requested station.<br />

The file used for the processing at CODE is available at http://www.aiub.unibe.ch/<br />

download/BSWUSER50/STA/FES2004.BLQ.<br />

22.8.12 Station Selection File<br />

Type: ASCII<br />

Directory: Campaign-specific directory STA.<br />

Extension: FIX<br />

Page 526 AIUB

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