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Bernese GPS Software Version 5.0 - Bernese GNSS Software

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22. Data Structure<br />

22.4.9 Subdaily Pole Model<br />

Type: ASCII<br />

Directory: ${X}/GEN (UNIX) or %X%\GEN (Windows)<br />

Extension: SUB<br />

Content: Subdaily pole model coefficients.<br />

Created by: User-defined.<br />

Used by: All programs writing and using orbit information.<br />

Example: Figure 22.11 and ${X}/GEN/IERS2000.SUB.<br />

The periodic variations of the Earth’s rotation due to tidal deformation are computed in<br />

subroutine ${LG}/UT1RED.f for periods between 5 and 35 days. The coefficients conform<br />

with IERS Conventions 1996 [McCarthy, 1996]. Coefficients for tidal variations in rotation<br />

and pole coordinates with daily and subdaily periods caused by ocean tides are specified<br />

in the subdaily pole model files. In <strong>Version</strong> <strong>5.0</strong> files for the subdaily pole models IERS2000<br />

[McCarthy and Petit, 2004] and RAY 96 [McCarthy, 1996] are available.<br />

The efficiency of the computation of subdaily corrections is increased by buffering and linear<br />

interpolation within 5 minute time intervals. The subdaily pole model file has to be used<br />

consequently for all programs starting with program PRETAB.<br />

For standard orbits generated with <strong>Version</strong> 4.2 the model RAY 96 has to be used.<br />

IERS Conventions 2000, based on Ray 1994<br />

--------------------------------------------------------------------------------<br />

SUBDAILY ERP MODEL NAME: IERS2000<br />

FUNDAMENTAL ARGUMENTS:<br />

---------------------<br />

ARG A0 A1 A2 ... A4 R<br />

(") ("/C) ("/C**2) ... ("/C**4)<br />

L 485868.2490360000 715923.2177999020 31.8792000000 ... -0.0002447000 1325.<br />

L’ 1287104.7930500000 1292581.0480999947 -0.5532000000 ... -0.0000114900 99.<br />

F 335779.5262320000 295262.8478000164 -12.7512000000 ... 0.0000041700 1342.<br />

D 1072260.7036900001 1105601.2090001106 -6.3706000000 ... -0.0000316900 1236.<br />

O 450160.3980360000 -482890.5431000004 7.4722000000 ... -0.0000593900 -5.<br />

TP 1657658.2261500000 2772.1929900000 1.3965600000 ... 0.0000000000 36625.<br />

FUNDAMENTAL ARGUMENTS PERIOD POLAR MOTION UT1<br />

(HOURS) (0.001 MAS) (0.001 MS)<br />

L L’ F D O T PMCOS PMSIN UTCOS UTSIN<br />

-1 0 -2 -2 -2 1 29.073 -0.90 -0.05 0.00 0.00<br />

-2 0 -2 0 -1 1 28.011 -0.60 0.10 0.00 0.00<br />

-2 0 -2 0 -2 1 28.006 -3.40 0.30 0.00 0.00<br />

0 0 -2 -2 -1 1 27.853 -0.80 0.10 0.00 0.00<br />

0 0 -2 -2 -2 1 27.848 -4.15 0.50 0.00 0.00<br />

-1 0 -2 0 -1 1 26.873 -<strong>5.0</strong>0 1.20 0.00 0.00<br />

...<br />

Figure 22.11: Subdaily pole model file IERS2000.SUB<br />

Page 492 AIUB

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