Changeset 1018 in ntrip


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Timestamp:
Aug 4, 2008, 12:37:03 PM (16 years ago)
Author:
weber
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* empty log message *

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  • trunk/BNS/bnshelp.html

    r1016 r1018  
    183183<p>
    184184<ul>
    185 <li>IGS05 which stands for the GNSS-based IGS realization of the International Terrestrial Reference System (ITRS), and</li>
     185<li>IGS05 which stands for the GNSS-based IGS realization of the International Terrestrial Reference Frame (ITRF2005), and</li>
    186186<li>ETRS89 which stands for the European Terrestrial Reference System 1989 adopted by EUREF.</li>
    187187</ul>
    188188</p>
    189189<p>
    190 As the clocks and orbits coming from real-time GNSS engine are expected to be in the 'IGS05' reference system (X,Y,Z, ECEF), no transformation is carried out if this option is selected.
    191 </p>
    192 <p>
    193 The implemented formulas for transformation from ITRS (IGS05) to ETRS89 are taken from 'Boucher and Altamimi 2007: Specifications for reference frame fixing in the analysis of EUREF GPS campaign', see <u>http://etrs89.ensg.ign.fr/memo2007.pdf</u>. The following Helmert transformation parameters have been introduced from there:
     190<u>Concerning 'IGS05';</u>
     191As the clocks and orbits coming from real-time GNSS engine are expected to be in the 'IGS05' system, no transformation is carried out if this option is selected.
     192</p>
     193<p>
     194<u>Concerning 'ETRS89';</u>
     195From the complete transformation chain 'IGS05->ITRF2005->ITRF2000->ETRS89' only the transformation 'ITRF2000->ETRS89' has been implemented. The formulas for that are taken from 'Boucher and Altamimi 2007: Specifications for reference frame fixing in the analysis of EUREF GPS campaign', see <u>http://etrs89.ensg.ign.fr/memo2007.pdf</u>. The following 6 Helmert transformation parameters were introduced:
    194196</p>
    195197<p>
    196198<pre>
    197 Translation in X:  0.056 m
    198 Translation in Y:  0.048 m
    199 Translation in Z: -0.037 m
    200 Rotation in X:  0.054 mas/y
    201 Rotation in Y:  0.518 mas/y
    202 Rotation in Z: -0.781 mas/y
     199Translation in X:  0.054 m
     200Translation in Y:  0.051 m
     201Translation in Z: -0.048 m
     202Rotation in X:  0.081 mas/y
     203Rotation in Y:  0.490 mas/y
     204Rotation in Z: -0.792 mas/y
    203205</pre>
    204206</p>
     207<p>
     208Note that the neglect of transformations 'IGS05->ITRF2005->ITRF2000' in BNS may lead to discrepancies up to 2 centimenters.
     209<p>
    205210
    206211<p><a name="input"><h4>4.5. Input</h4></p>
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