Clock Modelling - Revision history

Claudia.Prajanu at 19:02, 7 July 2018

2018-07-07T19:02:24Z

← Older revision		Revision as of 19:02, 7 July 2018
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	::The precise GPS and GLONASS satellite clocks provided by IGS are accurate at the order of <math>0.1</math> nanosecond or better <ref group="footnotes">Notice that <math>1</math> nanosecond of error means <math>30</math> centimetres in range.</ref>, see table 3.		::The precise GPS and GLONASS satellite clocks provided by IGS are accurate at the order of <math>0.1</math> nanosecond or better <ref group="footnotes">Notice that <math>1</math> nanosecond of error means <math>30</math> centimetres in range.</ref>, see table 3.

	::::[[File:Clock_Model_Table_IGS_orbit_clock_param.png\|none\|thumb\|640px\|'''''Table 3:''''' IGS orbits and clocks products: RMS accuracy, latency and sampling ~~(source: http://igscb.jpl.nasa.gov/components/prods.html, 2009)~~.]]		::::[[File:Clock_Model_Table_IGS_orbit_clock_param.png\|none\|thumb\|640px\|'''''Table 3:''''' IGS orbits and clocks products: RMS accuracy, latency and sampling.]]

Teresa.Ferreira at 20:01, 28 February 2013

2013-02-28T20:01:18Z

← Older revision		Revision as of 20:01, 28 February 2013
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	::In [[GLONASS General Introduction\|GLONASS]], as the message is updated every 1/2h, only a first order polynomial is considered, being (<math>a_0=-\tau_n</math>) the clock offset and (<math>a_1=\gamma_n</math>) the relative frequency offset, see table 2. Note that in the RINEX files the <math>-\tau_n</math> value is given instead of <math>\tau_n</math>.		::In [[GLONASS General Introduction\|GLONASS]], as the message is updated every 1/2h, only a first order polynomial is considered, being (<math>a_0=-\tau_n</math>) the clock offset and (<math>a_1=\gamma_n</math>) the relative frequency offset, see table 2. Note that in the [[Interfaces and Protocols\| RINEX files]] the <math>-\tau_n</math> value is given instead of <math>\tau_n</math>.

	::::[[File:Clock_Model_Table_GLONASS_broad_ephemeris_clock_param.png\|none\|thumb\|520px\|'''''Table 2:''''' GLONASS broadcast ephemeris and clock message parameters.]]		::::[[File:Clock_Model_Table_GLONASS_broad_ephemeris_clock_param.png\|none\|thumb\|520px\|'''''Table 2:''''' GLONASS broadcast ephemeris and clock message parameters.]]

Carlos.Lopez at 11:25, 23 February 2012

2012-02-23T11:25:50Z

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	\|Level=Intermediate		\|Level=Intermediate
	\|YearOfPublication=2011		\|YearOfPublication=2011
	~~\|Logo=gAGE~~
	\|Title={{PAGENAME}}		\|Title={{PAGENAME}}
	}}		}}

Jaume.Sanz at 12:41, 27 January 2012

2012-01-27T12:41:09Z

← Older revision		Revision as of 12:41, 27 January 2012
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	::Figure 1 illustrates the effect of neglecting the GPS satellite clock offsets on the user position. As it is shown the satellite clocks ~~reaches~~ up to more than <math>150</math> kilometres, which leads to huge position errors.		::Figure 1 illustrates the effect of neglecting the GPS satellite clock offsets on the user position. As it is shown the satellite clocks reach up to more than <math>150</math> kilometres, which leads to huge position errors.

	::{\|		::{\|

Jaume.Sanz at 12:39, 27 January 2012

2012-01-27T12:39:01Z

← Older revision		Revision as of 12:39, 27 January 2012
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	::In [[GLONASS General Introduction\|GLONASS]], as the message is updated every 1/2h, only a first order polynomial is considered, being (<math>a_0=-\tau_n</math>) the clock offset and (<math>a_1=\gamma_n</math>) the relative frequency offset, see table 2}. Note In the RINEX files the <math>-\tau_n</math> value is given instead of <math>\tau_n</math>.		::In [[GLONASS General Introduction\|GLONASS]], as the message is updated every 1/2h, only a first order polynomial is considered, being (<math>a_0=-\tau_n</math>) the clock offset and (<math>a_1=\gamma_n</math>) the relative frequency offset, see table 2. Note that in the RINEX files the <math>-\tau_n</math> value is given instead of <math>\tau_n</math>.

	::::[[File:Clock_Model_Table_GLONASS_broad_ephemeris_clock_param.png\|none\|thumb\|520px\|'''''Table 2:''''' GLONASS broadcast ephemeris and clock message parameters.]]		::::[[File:Clock_Model_Table_GLONASS_broad_ephemeris_clock_param.png\|none\|thumb\|520px\|'''''Table 2:''''' GLONASS broadcast ephemeris and clock message parameters.]]

Jaume.Sanz at 12:36, 27 January 2012

2012-01-27T12:36:40Z

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	{{Article Infobox2		{{Article Infobox2
	\|Category=Fundamentals		\|Category=Fundamentals
	\|Authors=J. Sanz Subirana, JM. Juan Zornoza and M. ~~Hernandez~~-Pajares, University of ~~Catalunia~~, Spain.		\|Authors=J. Sanz Subirana, J.M. Juan Zornoza and M. Hernández-Pajares, Technical University of Catalonia, Spain.
	\|Level=Intermediate		\|Level=Intermediate
	\|YearOfPublication=2011		\|YearOfPublication=2011

Jaume.Sanz at 12:36, 27 January 2012

2012-01-27T12:36:21Z

← Older revision		Revision as of 12:36, 27 January 2012
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	{{Article Infobox2		{{Article Infobox2
	\|Category=Fundamentals		\|Category=Fundamentals
	~~\|Title={{PAGENAME}}~~		\|Authors=J. Sanz Subirana, JM. Juan Zornoza and M. Hernandez-Pajares, University of Catalunia, Spain.
	\|Authors= J. Sanz Subirana, JM. Juan Zornoza and M. Hernandez-Pajares, University of Catalunia, Spain.
	\|Level=Intermediate		\|Level=Intermediate
	\|YearOfPublication=2011		\|YearOfPublication=2011
	\|Logo=gAGE		\|Logo=gAGE
			\|Title={{PAGENAME}}
	}}		}}

	The clock offsets are due to clock synchronism errors referring to GNSS ([[GPS General Introduction\|GPS]], [[GLONASS General Introduction\|GLONASS]], [[GALILEO General Introduction\|Galileo]]...) time scale. The modelling of such offsets, as well as its effect on the navigation solution, is described as follows.		The clock offsets are due to clock synchronism errors referring to GNSS ([[GPS General Introduction\|GPS]], [[GLONASS General Introduction\|GLONASS]], [[GALILEO General Introduction\|Galileo]]...) time scale. The modelling of such offsets, as well as its effect on the navigation solution, is described as follows.

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	::The first term (<math>\tilde{\delta t}^{sat}</math>) can be calculated from values broadcasted in the navigation messages (for the Standard Point Positioning) or from the precise products available from IGS centres or other providers (see [[Precise GNSS Satellite Coordinates Computation\|Precise Point Positioning]]) The second term <math>\Delta_{rel}</math> is small relativistic correction caused by the orbital eccentricity, (~~see~~ [[Relativistic Clock Correction]]).		::The first term (<math>\tilde{\delta t}^{sat}</math>) can be calculated from values broadcasted in the navigation messages (for the Standard Point Positioning) or from the precise products available from IGS centres or other providers (see [[Precise GNSS Satellite Coordinates Computation\|Precise Point Positioning]]) The second term <math>\Delta_{rel}</math> is small relativistic correction caused by the orbital eccentricity, see equation (2) in [[Relativistic Clock Correction]].

	::The broadcast navigation message provides the clock information as the coefficients of a polynomial, in a given reference epoch (<math>t_0</math>) to compute the satellite clock offset as:		::The broadcast navigation message provides the clock information as the coefficients of a polynomial, in a given reference epoch (<math>t_0</math>) to compute the satellite clock offset as:

Timo.Kouwenhoven: Text replace - "|Level=Medium" to "|Level=Intermediate"

2011-11-06T07:41:13Z

Text replace - "|Level=Medium" to "|Level=Intermediate"

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	\|Title={{PAGENAME}}		\|Title={{PAGENAME}}
	\|Authors= J. Sanz Subirana, JM. Juan Zornoza and M. Hernandez-Pajares, University of Catalunia, Spain.		\|Authors= J. Sanz Subirana, JM. Juan Zornoza and M. Hernandez-Pajares, University of Catalunia, Spain.
	\|Level=~~Medium~~		\|Level=Intermediate
	\|YearOfPublication=2011		\|YearOfPublication=2011
	\|Logo=gAGE		\|Logo=gAGE

Carlos.Lopez at 09:47, 28 October 2011

2011-10-28T09:47:49Z

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	\|Title={{PAGENAME}}		\|Title={{PAGENAME}}
	\|Authors= J. Sanz Subirana, JM. Juan Zornoza and M. Hernandez-Pajares, University of Catalunia, Spain.		\|Authors= J. Sanz Subirana, JM. Juan Zornoza and M. Hernandez-Pajares, University of Catalunia, Spain.
	\|Level=~~Advanced~~		\|Level=Medium
	\|YearOfPublication=2011		\|YearOfPublication=2011
	\|Logo=gAGE		\|Logo=gAGE

Carlos.Lopez at 08:26, 9 August 2011

2011-08-09T08:26:57Z

← Older revision		Revision as of 08:26, 9 August 2011
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	[[Category:Fundamentals]]		[[Category:Fundamentals]]
			[[Category:GNSS Measurements Modelling]]