Precise GNSS Satellite Coordinates Computation - Revision history

Claudia.Prajanu at 21:04, 23 September 2018

2018-09-23T21:04:48Z

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	Precise orbits and clocks for GPS and GLONASS satellites can be found at the International GNSS Service (IGS) web server ~~(http://igscb.jpl.nasa.gov)~~ <ref group="footnotes">Other useful sites with data products and information are the CDDIS at (ftp://cddis.gsfc.nasa.gov/gps) and (ftp://cddis.gsfc.nasa.gov/glonass~~), and (http://igscb.jpl.nasa.gov/components/compindex.html~~).</ref>.		Precise orbits and clocks for GPS and GLONASS satellites can be found at the International GNSS Service (IGS) web server <ref group="footnotes">Other useful sites with data products and information are the CDDIS at (ftp://cddis.gsfc.nasa.gov/gps) and (ftp://cddis.gsfc.nasa.gov/glonass).</ref>.

Raphael.Legouge: Change the link to igs05.atx file. This file is now obsolet because newer ITRF realizations. Replaced with a link to a document that describes the atx format on the igs website.

2018-03-13T08:05:50Z

Change the link to igs05.atx file. This file is now obsolet because newer ITRF realizations. Replaced with a link to a document that describes the atx format on the igs website.

← Older revision		Revision as of 08:05, 13 March 2018
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	The ANTenna EXchange format (ANTEX) files, along with other additional useful information on IGS antennas <ref group="footnotes"> ~~http~~://~~www~~.~~epncb~~.~~oma.be~~/~~ftp~~/~~station~~/~~general~~/~~igs05_1545.atx~~.</ref>.		The ANTenna EXchange format (ANTEX) files, along with other additional useful information on IGS antennas <ref group="footnotes"> https://kb.igs.org/hc/en-us/articles/203864436-Antenna-Files-Information.</ref>.

Carlos.Lopez at 11:39, 23 February 2012

2012-02-23T11:39:53Z

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Jaume.Sanz at 08:23, 27 January 2012

2012-01-27T08:23:12Z

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	Precise orbits and clocks for GPS and GLONASS satellites can be found at the International GNSS Service (IGS) web server (http://igscb.jpl.nasa.gov) <ref group="footnotes">Other useful sites with data products and information are the CDDIS at (ftp://cddis.gsfc.nasa.gov/gps) and (ftp://cddis.gsfc.nasa.gov/glonass), and (http://igscb.jpl.nasa.gov/components/compindex.html.</ref>.		Precise orbits and clocks for GPS and GLONASS satellites can be found at the International GNSS Service (IGS) web server (http://igscb.jpl.nasa.gov) <ref group="footnotes">Other useful sites with data products and information are the CDDIS at (ftp://cddis.gsfc.nasa.gov/gps) and (ftp://cddis.gsfc.nasa.gov/glonass), and (http://igscb.jpl.nasa.gov/components/compindex.html).</ref>.

Jaume.Sanz at 08:22, 27 January 2012

2012-01-27T08:22:52Z

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	Precise orbits and clocks for GPS and GLONASS satellites can be found at the International GNSS Service (IGS) web server (http://igscb.jpl.nasa.gov) <ref group="footnotes">Other useful sites with data products and information are the CDDIS at (ftp://cddis.gsfc.nasa.gov/gps) and (ftp://cddis.gsfc.nasa.gov/glonass), and (http://igscb.jpl.nasa.gov/components/compindex.html}.</ref>.		Precise orbits and clocks for GPS and GLONASS satellites can be found at the International GNSS Service (IGS) web server (http://igscb.jpl.nasa.gov) <ref group="footnotes">Other useful sites with data products and information are the CDDIS at (ftp://cddis.gsfc.nasa.gov/gps) and (ftp://cddis.gsfc.nasa.gov/glonass), and (http://igscb.jpl.nasa.gov/components/compindex.html.</ref>.

Jaume.Sanz at 07:59, 27 January 2012

2012-01-27T07:59:05Z

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	As an example of polynomial interpolation, the Lagrange method is presented as follows:		As an example of polynomial interpolation, the Lagrange method is presented as follows:

	Given a table of values <math>(x_i,y_i)</math>, <math>i=1,\dots,n</math>, ~~the~~ the interpolated value		Given a table of values <math>(x_i,y_i)</math>, <math>i=1,\dots,n</math>, the interpolated value
	<math>y\simeq P_n(x)</math> at a given <math>x</math> can be computed as:		<math>y\simeq P_n(x)</math> at a given <math>x</math> can be computed as:

Jaume.Sanz at 07:55, 27 January 2012

2012-01-27T07:55:28Z

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	The ANTEX files, along with other additional useful information on IGS antennas <ref group="footnotes"> http://www.epncb.oma.be/ftp/station/general/~~igs05\_1545~~.atx.</ref>.		The ANTenna EXchange format (ANTEX) files, along with other additional useful information on IGS antennas <ref group="footnotes"> http://www.epncb.oma.be/ftp/station/general/igs05_1545.atx.</ref>.

Jaume.Sanz at 07:53, 27 January 2012

2012-01-27T07:53:05Z

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	Some centres provide also GPS satellite clocks with 5 seconds sampling rate, like files obtained from the CDDIS site <ref group="footnotes">		Some centres provide also GPS satellite clocks with 5 seconds sampling rate, like files obtained from the CDDIS site <ref group="footnotes">
	ftp://cddis.gsfc.nasa.gov/pub/gps/products/.</ref>. Please bear in mind that orbits and clock files must consistent (i.e., they must come from the same centre). Therefore, CODE clocks must be used with CODE orbits, and not with JPL nor EMR products, for instance.		ftp://cddis.gsfc.nasa.gov/pub/gps/products/.</ref>. Please bear in mind that orbits and clock files must be consistent (i.e., they must come from the same centre). Therefore, CODE clocks must be used with CODE orbits, and not with JPL nor EMR products, for instance.

Jaume.Sanz at 07:52, 27 January 2012

2012-01-27T07:52:18Z

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	::[[File: GNSS_SV_Coord_Comp.png\|none\|thumb\|640px\|'''''Table 1:''''' IGS orbits and clocks products: RMS accuracy, latency and sampling (source: http://igscb.jpl.nasa.gov/components/prods.html}, 2009).]]		::[[File: GNSS_SV_Coord_Comp.png\|none\|thumb\|640px\|'''''Table 1:''''' IGS orbits and clocks products: RMS accuracy, latency and sampling (source: http://igscb.jpl.nasa.gov/components/prods.html, 2009).]]

Jaume.Sanz at 07:41, 27 January 2012

2012-01-27T07:41:37Z

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	Table 1 summarizes the different products available, their accuracy, latency and sampling rate. It must be pointed out that IGS has adopted the ITRS as its reference system. Thence, IGS products are referred to this system.		Table 1 summarizes the different products available, their accuracy, latency and sampling rate. It must be pointed out that IGS has adopted the International Terrestrial Reference System (ITRS) as its reference system. Thence, IGS products are referred to this system.