GLONASS Navigation Message - Revision history

Gema.Cueto: Updated reference ICD/SDD links

2026-04-17T13:11:07Z

Updated reference ICD/SDD links

← Older revision		Revision as of 13:11, 17 April 2026
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	The message content divides the data in immediate data of the transmitting satellite and non-immediate data for the other satellites. The immediate data is repeated in the first four strings of every frame. It comprises the ephemeris parameters, satellite clock offsets, satellite healthy flag and the relative difference between carrier frequency of the satellite and its nominal value. The non-immediate data is broadcast in the strings 5 to 15 of each frame (almanac for 24 satellites). The frames I to IV contain almanac for 20 satellites (5 per frame), and the 5th frame almanac for 4 satellites. The last 2 strings of frame 5 are reserved bits (the almanac of each satellite uses 2 strings).		The message content divides the data in immediate data of the transmitting satellite and non-immediate data for the other satellites. The immediate data is repeated in the first four strings of every frame. It comprises the ephemeris parameters, satellite clock offsets, satellite healthy flag and the relative difference between carrier frequency of the satellite and its nominal value. The non-immediate data is broadcast in the strings 5 to 15 of each frame (almanac for 24 satellites). The frames I to IV contain almanac for 20 satellites (5 per frame), and the 5th frame almanac for 4 satellites. The last 2 strings of frame 5 are reserved bits (the almanac of each satellite uses 2 strings).

	The ephemerides values are predicted from the Ground Control Centre for a 24 hours period, and the satellite transmits a new set of ephemerides every 30 minutes. These data differ from GPS data. Instead of Keplerian orbital elements, they are provided as Earth Centred Earth Fixed (ECEF) Cartesian coordinates in position and velocity, with lunisolar acceleration perturbation parameters. The GLONASS-ICD <ref>[https://~~glonass-iac~~.~~ru/upload~~/~~docs~~/~~stehos~~/~~stehos_en~~.pdf GLONASS ICD~~, 2020~~]</ref> provides the integration equations based on 4th-order-Runge-Kutta method, which includes the second zonal geopotential harmonic coefficient. The almanac is quite similar to the GPS one, given as modified Keplerian parameters, and it is updated approximately once per day.		The ephemerides values are predicted from the Ground Control Centre for a 24 hours period, and the satellite transmits a new set of ephemerides every 30 minutes. These data differ from GPS data. Instead of Keplerian orbital elements, they are provided as Earth Centred Earth Fixed (ECEF) Cartesian coordinates in position and velocity, with lunisolar acceleration perturbation parameters. The GLONASS-ICD <ref>[https://unavco.knowledgebase.co/assets/727/ikd51en.pdf GLONASS ICD]</ref> provides the integration equations based on 4th-order-Runge-Kutta method, which includes the second zonal geopotential harmonic coefficient. The almanac is quite similar to the GPS one, given as modified Keplerian parameters, and it is updated approximately once per day.

	The navigation message of the high accuracy signal (P) structure is not officially published, but different research groups decoded it. According with these investigations each satellite transmits a superframe, which is composed of 72 frames, each containing 5 strings of 100 bits. A frame needs 10 seconds to be transmitted, thence the total length of message is 12 minutes. The first three frames contain the ephemeris for the transmitting satellite.		The navigation message of the high accuracy signal (P) structure is not officially published, but different research groups decoded it. According with these investigations each satellite transmits a superframe, which is composed of 72 frames, each containing 5 strings of 100 bits. A frame needs 10 seconds to be transmitted, thence the total length of message is 12 minutes. The first three frames contain the ephemeris for the transmitting satellite.

Gema.Cueto at 11:07, 16 April 2026

2026-04-16T11:07:15Z

← Older revision		Revision as of 11:07, 16 April 2026
Line 14:		Line 14:
	The message content divides the data in immediate data of the transmitting satellite and non-immediate data for the other satellites. The immediate data is repeated in the first four strings of every frame. It comprises the ephemeris parameters, satellite clock offsets, satellite healthy flag and the relative difference between carrier frequency of the satellite and its nominal value. The non-immediate data is broadcast in the strings 5 to 15 of each frame (almanac for 24 satellites). The frames I to IV contain almanac for 20 satellites (5 per frame), and the 5th frame almanac for 4 satellites. The last 2 strings of frame 5 are reserved bits (the almanac of each satellite uses 2 strings).		The message content divides the data in immediate data of the transmitting satellite and non-immediate data for the other satellites. The immediate data is repeated in the first four strings of every frame. It comprises the ephemeris parameters, satellite clock offsets, satellite healthy flag and the relative difference between carrier frequency of the satellite and its nominal value. The non-immediate data is broadcast in the strings 5 to 15 of each frame (almanac for 24 satellites). The frames I to IV contain almanac for 20 satellites (5 per frame), and the 5th frame almanac for 4 satellites. The last 2 strings of frame 5 are reserved bits (the almanac of each satellite uses 2 strings).

	The ephemerides values are predicted from the Ground Control Centre for a 24 hours period, and the satellite transmits a new set of ephemerides every 30 minutes. These data differ from GPS data. Instead of Keplerian orbital elements, they are provided as Earth Centred Earth Fixed (ECEF) Cartesian coordinates in position and velocity, with lunisolar acceleration perturbation parameters. The GLONASS-ICD [GLONASS ICD, ~~2008~~] provides the integration equations based on 4th-order-Runge-Kutta method, which includes the second zonal geopotential harmonic coefficient. The almanac is quite similar to the GPS one, given as modified Keplerian parameters, and it is updated approximately once per day.		The ephemerides values are predicted from the Ground Control Centre for a 24 hours period, and the satellite transmits a new set of ephemerides every 30 minutes. These data differ from GPS data. Instead of Keplerian orbital elements, they are provided as Earth Centred Earth Fixed (ECEF) Cartesian coordinates in position and velocity, with lunisolar acceleration perturbation parameters. The GLONASS-ICD <ref>[https://glonass-iac.ru/upload/docs/stehos/stehos_en.pdf GLONASS ICD, 2020]</ref> provides the integration equations based on 4th-order-Runge-Kutta method, which includes the second zonal geopotential harmonic coefficient. The almanac is quite similar to the GPS one, given as modified Keplerian parameters, and it is updated approximately once per day.

	The navigation message of the high accuracy signal (P) structure is not officially published, but different research groups decoded it. According with these investigations each satellite transmits a superframe, which is composed of 72 frames, each containing 5 strings of 100 bits. A frame needs 10 seconds to be transmitted, thence the total length of message is 12 minutes. The first three frames contain the ephemeris for the transmitting satellite.		The navigation message of the high accuracy signal (P) structure is not officially published, but different research groups decoded it. According with these investigations each satellite transmits a superframe, which is composed of 72 frames, each containing 5 strings of 100 bits. A frame needs 10 seconds to be transmitted, thence the total length of message is 12 minutes. The first three frames contain the ephemeris for the transmitting satellite.
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	==References==		==References==
	* GLONASS ICD, 2008. Technical report. v.5.1.
	* Hofmann-Wellenhof, B., Lichtenegger, H., K. and Wasle, E., 2008. GNSS - Global Navigation Satellite Systems.. Springer-Verlag, Wien, Austria.		* Hofmann-Wellenhof, B., Lichtenegger, H., K. and Wasle, E., 2008. GNSS - Global Navigation Satellite Systems.. Springer-Verlag, Wien, Austria.
	* [http://www.oosa.unvienna.org/pdf/publications/st_space_24E.pdf United Nations, 2004] Report of the action team on global navigation satellite systems (GNSS) – Follow up to the Third United Nations Conference on the Exploration and Peaceful Uses of Outer Space (UNISPACE III).		* [http://www.oosa.unvienna.org/pdf/publications/st_space_24E.pdf United Nations, 2004] Report of the action team on global navigation satellite systems (GNSS) – Follow up to the Third United Nations Conference on the Exploration and Peaceful Uses of Outer Space (UNISPACE III).

Carlos.Lopez at 10:15, 23 February 2012

2012-02-23T10:15:54Z

← Older revision		Revision as of 10:15, 23 February 2012
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	\|Level=Basic		\|Level=Basic
	\|YearOfPublication=2011		\|YearOfPublication=2011
	~~\|Logo=gAGE~~
	\|Title={{PAGENAME}}		\|Title={{PAGENAME}}
	}}		}}

Carlos.Lopez at 08:30, 23 January 2012

2012-01-23T08:30:52Z

← Older revision		Revision as of 08:30, 23 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=Basic		\|Level=Basic
	\|YearOfPublication=2011		\|YearOfPublication=2011
			\|Logo=gAGE
			\|Title={{PAGENAME}}
	}}		}}
	GLONASS satellites modulate two navigation messages at 50 bps onto the standard (C/A) and high accuracy (P) signals, each message providing the users the necessary information for positioning (parameters to compute GLONASS satellites coordinates, their clock offsets, and various other system parameters).		GLONASS satellites modulate two navigation messages at 50 bps onto the standard (C/A) and high accuracy (P) signals, each message providing the users the necessary information for positioning (parameters to compute GLONASS satellites coordinates, their clock offsets, and various other system parameters).

Carlos.Lopez at 15:24, 26 October 2011

2011-10-26T15:24:59Z

@@ Line 6: / Line 6: @@
 |YearOfPublication=2011
 }}
 GLONASS satellites modulate two navigation messages at 50 bps onto the standard (C/A) and high accuracy (P) signals, each message providing the users the necessary information for positioning (parameters to compute GLONASS satellites coordinates, their clock offsets, and various other system parameters).
@@ Line 58: / Line 18: @@
 The navigation message of the high accuracy signal (P) structure is not officially published, but different research groups decoded it. According with these investigations each satellite transmits a superframe, which is composed of 72 frames, each containing 5 strings of 100 bits. A frame needs 10 seconds to be transmitted, thence the total length of message is 12 minutes. The first three frames contain the ephemeris for the transmitting satellite.
 ==Notes==
@@ Line 73: / Line 28: @@
 [[Category:Fundamentals]]
 [[Category:GLONASS Signal Structure]]

Carlos.Lopez: moved GLONASS signal description to GLONASS Navigation Message

2011-10-26T15:24:01Z

moved GLONASS signal description to GLONASS Navigation Message

← Older revision	Revision as of 15:24, 26 October 2011
(No difference)

Timo.Kouwenhoven at 14:07, 23 March 2011

2011-03-23T14:07:51Z

← Older revision		Revision as of 14:07, 23 March 2011
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	[[Category:Fundamentals]]		[[Category:Fundamentals]]
			[[Category:GLONASS Signal Structure]]

Timo.Kouwenhoven: /* GLONASS Navigation message */

2011-01-23T16:40:40Z

GLONASS Navigation message

← Older revision		Revision as of 16:40, 23 January 2011
Line 54:		Line 54:
	The message content divides the data in immediate data of the transmitting satellite and non-immediate data for the other satellites. The immediate data is repeated in the first four strings of every frame. It comprises the ephemeris parameters, satellite clock offsets, satellite healthy flag and the relative difference between carrier frequency of the satellite and its nominal value. The non-immediate data is broadcast in the strings 5 to 15 of each frame (almanac for 24 satellites). The frames I to IV contain almanac for 20 satellites (5 per frame), and the 5th frame almanac for 4 satellites. The last 2 strings of frame 5 are reserved bits (the almanac of each satellite uses 2 strings).		The message content divides the data in immediate data of the transmitting satellite and non-immediate data for the other satellites. The immediate data is repeated in the first four strings of every frame. It comprises the ephemeris parameters, satellite clock offsets, satellite healthy flag and the relative difference between carrier frequency of the satellite and its nominal value. The non-immediate data is broadcast in the strings 5 to 15 of each frame (almanac for 24 satellites). The frames I to IV contain almanac for 20 satellites (5 per frame), and the 5th frame almanac for 4 satellites. The last 2 strings of frame 5 are reserved bits (the almanac of each satellite uses 2 strings).

	The ephemerides values are predicted from the Ground Control Centre for a 24 hours period, and the satellite transmits a new set of ephemerides every 30 minutes. These data differ from GPS data. Instead of Keplerian orbital elements, they are provided as Earth Centred Earth Fixed (ECEF) Cartesian coordinates in position and velocity, with lunisolar acceleration perturbation parameters. The GLONASS-ICD [GLONASS ICD, 2008] provides the integration equations based on 4th-order-Runge-Kutta method, which includes the second zonal ~~geopoten- tial~~ harmonic coefficient. The almanac is quite similar to the GPS one, given as modified Keplerian parameters, and it is updated approximately once per day.		The ephemerides values are predicted from the Ground Control Centre for a 24 hours period, and the satellite transmits a new set of ephemerides every 30 minutes. These data differ from GPS data. Instead of Keplerian orbital elements, they are provided as Earth Centred Earth Fixed (ECEF) Cartesian coordinates in position and velocity, with lunisolar acceleration perturbation parameters. The GLONASS-ICD [GLONASS ICD, 2008] provides the integration equations based on 4th-order-Runge-Kutta method, which includes the second zonal geopotential harmonic coefficient. The almanac is quite similar to the GPS one, given as modified Keplerian parameters, and it is updated approximately once per day.

	The navigation message of the high accuracy signal (P) structure is not officially published, but different research groups decoded it. According with these investigations each satellite transmits a superframe, which is composed of 72 frames, each containing 5 strings of 100 bits. A frame needs 10 seconds to be transmitted, thence the total length of message is 12 minutes. The first three frames contain the ephemeris for the transmitting satellite.		The navigation message of the high accuracy signal (P) structure is not officially published, but different research groups decoded it. According with these investigations each satellite transmits a superframe, which is composed of 72 frames, each containing 5 strings of 100 bits. A frame needs 10 seconds to be transmitted, thence the total length of message is 12 minutes. The first three frames contain the ephemeris for the transmitting satellite.

Timo.Kouwenhoven: /* GLONASS Navigation message */

2011-01-23T16:40:22Z

GLONASS Navigation message

← Older revision		Revision as of 16:40, 23 January 2011
Line 54:		Line 54:
	The message content divides the data in immediate data of the transmitting satellite and non-immediate data for the other satellites. The immediate data is repeated in the first four strings of every frame. It comprises the ephemeris parameters, satellite clock offsets, satellite healthy flag and the relative difference between carrier frequency of the satellite and its nominal value. The non-immediate data is broadcast in the strings 5 to 15 of each frame (almanac for 24 satellites). The frames I to IV contain almanac for 20 satellites (5 per frame), and the 5th frame almanac for 4 satellites. The last 2 strings of frame 5 are reserved bits (the almanac of each satellite uses 2 strings).		The message content divides the data in immediate data of the transmitting satellite and non-immediate data for the other satellites. The immediate data is repeated in the first four strings of every frame. It comprises the ephemeris parameters, satellite clock offsets, satellite healthy flag and the relative difference between carrier frequency of the satellite and its nominal value. The non-immediate data is broadcast in the strings 5 to 15 of each frame (almanac for 24 satellites). The frames I to IV contain almanac for 20 satellites (5 per frame), and the 5th frame almanac for 4 satellites. The last 2 strings of frame 5 are reserved bits (the almanac of each satellite uses 2 strings).

	The ephemerides values are predicted from the Ground Control Centre for a 24 hours period, and the satellite transmits a new set of ephemerides every 30 ~~min- utes~~. These data differ from GPS data. Instead of Keplerian orbital elements, they are provided as Earth Centred Earth Fixed (ECEF) Cartesian coordinates in position and velocity, with lunisolar acceleration perturbation parameters. The GLONASS-ICD [GLONASS ICD, 2008] provides the integration equations based on 4th-order-Runge-Kutta method, which includes the second zonal geopoten- tial harmonic coefficient. The almanac is quite similar to the GPS one, given as modified Keplerian parameters, and it is updated approximately once per day.		The ephemerides values are predicted from the Ground Control Centre for a 24 hours period, and the satellite transmits a new set of ephemerides every 30 minutes. These data differ from GPS data. Instead of Keplerian orbital elements, they are provided as Earth Centred Earth Fixed (ECEF) Cartesian coordinates in position and velocity, with lunisolar acceleration perturbation parameters. The GLONASS-ICD [GLONASS ICD, 2008] provides the integration equations based on 4th-order-Runge-Kutta method, which includes the second zonal geopoten- tial harmonic coefficient. The almanac is quite similar to the GPS one, given as modified Keplerian parameters, and it is updated approximately once per day.

	The navigation message of the high accuracy signal (P) structure is not officially published, but different research groups decoded it. According with these investigations each satellite transmits a superframe, which is composed of 72 frames, each containing 5 strings of 100 bits. A frame needs 10 seconds to be transmitted, thence the total length of message is 12 minutes. The first three frames contain the ephemeris for the transmitting satellite.		The navigation message of the high accuracy signal (P) structure is not officially published, but different research groups decoded it. According with these investigations each satellite transmits a superframe, which is composed of 72 frames, each containing 5 strings of 100 bits. A frame needs 10 seconds to be transmitted, thence the total length of message is 12 minutes. The first three frames contain the ephemeris for the transmitting satellite.

Timo.Kouwenhoven: /* Introduction */

2011-01-23T11:59:24Z

Introduction

← Older revision		Revision as of 11:59, 23 January 2011
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	<math>		<math>
	\begin{array}{lcl}		\begin{array}{lcl}
	Frequency \, band \, G3 \, (subject to change): \\		Frequency \, band \, G3 \, (subject\, to\, change): \\
	f 3(k) = 1 204.7040 + k ∗ \frac {423}{1000} = (2 848 + k) ∗ \frac {423}{1000} MHz		f 3(k) = 1 204.7040 + k ∗ \frac {423}{1000} = (2 848 + k) ∗ \frac {423}{1000} MHz
	\end{array}		\end{array}