Galileo Signal Plan - Revision history

Gema.Cueto at 10:11, 16 April 2026

2026-04-16T10:11:01Z

Gema.Cueto at 13:25, 1 March 2022

2022-03-01T13:25:20Z

← Older revision		Revision as of 13:25, 1 March 2022
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	As we can recognize from the figure above, the AltBOC(15,10) modulation is very similar to two ~~BPSK~~(10) signals shifted by 15 MHz to the left and right of the carrier frequency. Indeed, since to acquire all the main lobes of the modulation a very wide bandwidth is necessary, many receivers will operate correlating the AltBOC signal with a ~~BPSK~~(10) replica.		As we can recognize from the figure above, the AltBOC(15,10) modulation is very similar to two QPSK(10) signals shifted by 15 MHz to the left and right of the carrier frequency. Indeed, since to acquire all the main lobes of the modulation a very wide bandwidth is necessary, many receivers will operate correlating the AltBOC signal with a QPSK(10) replica.

	To have a better feeling about the overlapping between GPS and Galileo in E5, the next figure shows all the signals described so far for this band.		To have a better feeling about the overlapping between GPS and Galileo in E5, the next figure shows all the signals described so far for this band.

Gema.Cueto: /* Credits */

2021-06-04T11:04:32Z

Credits

← Older revision		Revision as of 11:04, 4 June 2021
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	== Credits ==		== Credits ==
	The information presented in this NAVIPEDIA’s article is an extract of the PhD work performed by Dr. Jose Ángel Ávila Rodríguez in the FAF University of Munich as part of his Doctoral Thesis “On Generalized Signal Waveforms for Satellite Navigation” presented in June 2008, Munich (Germany).		The original information presented in this NAVIPEDIA’s article is an extract of the PhD work performed by Dr. Jose Ángel Ávila Rodríguez in the FAF University of Munich as part of his Doctoral Thesis “On Generalized Signal Waveforms for Satellite Navigation” presented in June 2008, Munich (Germany).

	Galileo OS SIS ICD and Galileo CS demo website information ~~has been used~~ to ~~update~~ the ~~content of this article~~ to the ~~latest~~ status of Galileo signals.		This article has been updated based on the applicable Galileo OS SIS ICD and Galileo CS demo website information, in order to reflect the most updated information related to the status of Galileo signals. If there is any discrepancy between the information contained in this article and the applicable Galileo OS SIS ICD, the information of the latter prevails.

	If there is any discrepancy between the information contained in this article and the applicable Galileo OS SIS ICD, the information of the latter prevails.
	[[Category:GNSS Signals]]		[[Category:GNSS Signals]]
	[[Category:GALILEO]]		[[Category:GALILEO]]
	[[Category:GALILEO Signal Structure]]		[[Category:GALILEO Signal Structure]]

Gema.Cueto: /* Credits */

2021-06-04T11:02:32Z

Credits

← Older revision		Revision as of 11:02, 4 June 2021
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	Galileo OS SIS ICD and Galileo CS demo website information has been used to update the content of this article to the latest status of Galileo signals.		Galileo OS SIS ICD and Galileo CS demo website information has been used to update the content of this article to the latest status of Galileo signals.

	If there is any discrepancy between the information contained in this article and the ~~current~~ Galileo OS SIS ICD, the information of the latter prevails.		If there is any discrepancy between the information contained in this article and the applicable Galileo OS SIS ICD, the information of the latter prevails.
	[[Category:GNSS Signals]]		[[Category:GNSS Signals]]
	[[Category:GALILEO]]		[[Category:GALILEO]]
	[[Category:GALILEO Signal Structure]]		[[Category:GALILEO Signal Structure]]

Gema.Cueto: /* Credits */

2021-06-04T06:45:52Z

Credits

← Older revision		Revision as of 06:45, 4 June 2021
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	Galileo OS SIS ICD and Galileo CS demo website information has been used to update the content of this article to the latest status of Galileo signals.		Galileo OS SIS ICD and Galileo CS demo website information has been used to update the content of this article to the latest status of Galileo signals.

			If there is any discrepancy between the information contained in this article and the current Galileo OS SIS ICD, the information of the latter prevails.
	[[Category:GNSS Signals]]		[[Category:GNSS Signals]]
	[[Category:GALILEO]]		[[Category:GALILEO]]
	[[Category:GALILEO Signal Structure]]		[[Category:GALILEO Signal Structure]]

Gema.Cueto at 09:25, 17 May 2021

2021-05-17T09:25:41Z

← Older revision		Revision as of 09:25, 17 May 2021
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	E6 signals are modulated with a binary phase shift keying BPSK(5) at a carrier frequency of 1278.75 MHz, which is used by all satellites and shared though a CDMA RF channel access mode.		E6 signals are modulated with a binary phase shift keying BPSK(5) at a carrier frequency of 1278.75 MHz, which is used by all satellites and shared though a CDMA RF channel access mode.

	Therefore, as shown in Galileo OS SIS ICD<ref name="GAL_SIS_ICD_2010"/>, the transmitted Galileo E6 signal consists of the following components:		Therefore, as shown in Galileo OS SIS ICD<ref name="GAL_SIS_ICD_2010"/>, the transmitted Galileo E6 signal consists of the following components, both (pilot and data components) are combined on the same carrier component, with a power sharing of 50 percent:

	* <math>e_{E6-B}</math> from the C/NAV navigation data stream <math>D_{E6-B}</math> modulated with the encrypted ranging code <math>C_{E6-B}</math>		* <math>e_{E6-B}</math> from the C/NAV navigation data stream <math>D_{E6-B}</math> modulated with the encrypted ranging code <math>C_{E6-B}</math>

Gema.Cueto at 09:16, 17 May 2021

2021-05-17T09:16:34Z

← Older revision		Revision as of 09:16, 17 May 2021
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	::[[File:Galileo_Signal_Plan_Eq_1.png\|none\|300px]]		::[[File:Galileo_Signal_Plan_Eq_1.png\|none\|300px]]

	The generic view of the E1 Open Service signal generation can be depicted as follows<ref name="GAL_SIS_ICD_2010">[https://www.gsc-europa.eu/~~system~~/files/~~galileo_documents~~/~~Galileo-OS-SIS-ICD~~.pdf Applicable Galileo OS Signal In Space Interface Control Document (SIS ICD)]</ref>:		The generic view of the E1 Open Service signal generation can be depicted as follows<ref name="GAL_SIS_ICD_2010">[https://www.gsc-europa.eu/sites/default/files/sites/all/files/Galileo_OS_SIS_ICD_v2.0.pdf Applicable Galileo OS Signal In Space Interface Control Document (SIS ICD)]</ref>:

	::::[[File:Galileo_E1_Modulation_scheme.PNG\|none\|thumb\|580px\|'''''Figure 1:''''' Modulation Scheme for the Galileo E1 CBOC Signal, Credits: Galileo OS SIS ICD.]]		::::[[File:Galileo_E1_Modulation_scheme.PNG\|none\|thumb\|580px\|'''''Figure 1:''''' Modulation Scheme for the Galileo E1 CBOC Signal, Credits: Galileo OS SIS ICD.]]

Gema.Cueto: /* Galileo E6 Band */

2020-03-16T16:07:07Z

Galileo E6 Band

← Older revision		Revision as of 16:07, 16 March 2020
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	The E6 Commercial Service (CS), now High Accuracy Service (HAS), codes are random codes [J. Winkel, 2006] <ref>[J. Winkel, 2006] J. Winkel, Spreading Codes for a Satellite Navigation System, Patent number WO/2006/063613, International Application No.: PCT/EP2004/014488, Publication date: 22 June 2006</ref>. The main idea behind is to generate a family of codes that fulfils the properties of randomness as well as possible [J.-A. Avila-Rodriguez et al., 2007] <ref name="JAV_2007"/>. The codes can be driven to fulfil special properties such as balance and weakened balance, where the probability of 0’s and 1’s must not be identical but within a well-defined range, or to realize the autocorrelation side-lobe zero (ASZ) property. This latter property guarantees that the autocorrelation values of every code correlate to zero with a delayed version of itself, shifted by one chip. The main specifications of the Galileo E6-b and E6-C codes to facilitate the development of Galileo E6-B/C enabled receivers have already been published<ref name="GAL_E6-B_E6-C">[https://www.gsc-europa.eu/sites/default/files/sites/all/files/E6BC_SIS_Technical_Note.pdf Galileo E6-B and E6-C ranging codes~~]</ref><ref name="GAL_E6BC TN">[https://www.gsc-europa.eu/system/files/galileo_documents/E6BC_SIS_Technical_Note.pdf Galileo E6-BC SIS Technical Note~~]</ref>.		The E6 Commercial Service (CS), now High Accuracy Service (HAS), codes are random codes [J. Winkel, 2006] <ref>[J. Winkel, 2006] J. Winkel, Spreading Codes for a Satellite Navigation System, Patent number WO/2006/063613, International Application No.: PCT/EP2004/014488, Publication date: 22 June 2006</ref>. The main idea behind is to generate a family of codes that fulfils the properties of randomness as well as possible [J.-A. Avila-Rodriguez et al., 2007] <ref name="JAV_2007"/>. The codes can be driven to fulfil special properties such as balance and weakened balance, where the probability of 0’s and 1’s must not be identical but within a well-defined range, or to realize the autocorrelation side-lobe zero (ASZ) property. This latter property guarantees that the autocorrelation values of every code correlate to zero with a delayed version of itself, shifted by one chip. The main specifications of the Galileo E6-b and E6-C codes to facilitate the development of Galileo E6-B/C enabled receivers have already been published<ref name="GAL_E6-B_E6-C">[https://www.gsc-europa.eu/sites/default/files/sites/all/files/E6BC_SIS_Technical_Note.pdf Galileo E6-B and E6-C ranging codes]</ref>.

	::::[[File:Galileo_Signal_Plan_Table_3.png\|none\|thumb\|580px\|'''''Table 3:''''' Galileo E6 signal technical characteristics.]]		::::[[File:Galileo_Signal_Plan_Table_3.png\|none\|thumb\|580px\|'''''Table 3:''''' Galileo E6 signal technical characteristics.]]

Gema.Cueto: /* Credits */

2020-03-16T13:40:21Z

Credits

← Older revision		Revision as of 13:40, 16 March 2020
Line 142:		Line 142:

	== Credits ==		== Credits ==
	The information presented in this NAVIPEDIA’s article is an extract of the PhD work performed by Dr. Jose Ángel Ávila Rodríguez in the FAF University of Munich as part of his Doctoral Thesis “On Generalized Signal Waveforms for Satellite Navigation” presented in June 2008, Munich (Germany). Galileo OS SIS ICD and Galileo CS demo website information has been used to update the content of this article to the latest status of Galileo signals.		The information presented in this NAVIPEDIA’s article is an extract of the PhD work performed by Dr. Jose Ángel Ávila Rodríguez in the FAF University of Munich as part of his Doctoral Thesis “On Generalized Signal Waveforms for Satellite Navigation” presented in June 2008, Munich (Germany).

			Galileo OS SIS ICD and Galileo CS demo website information has been used to update the content of this article to the latest status of Galileo signals.

Gema.Cueto: /* Galileo E6 Band */

2020-03-16T13:38:42Z

Galileo E6 Band

← Older revision		Revision as of 13:38, 16 March 2020
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	The E6 Commercial Service (CS), now High Accuracy Service (HAS), codes are random codes [J. Winkel, 2006] <ref>[J. Winkel, 2006] J. Winkel, Spreading Codes for a Satellite Navigation System, Patent number WO/2006/063613, International Application No.: PCT/EP2004/014488, Publication date: 22 June 2006</ref>. The main idea behind is to generate a family of codes that fulfils the properties of randomness as well as possible [J.-A. Avila-Rodriguez et al., 2007] <ref name="JAV_2007"/>. The codes can be driven to fulfil special properties such as balance and weakened balance, where the probability of 0’s and 1’s must not be identical but within a well-defined range, or to realize the autocorrelation side-lobe zero (ASZ) property. This latter property guarantees that the autocorrelation values of every code correlate to zero with a delayed version of itself, shifted by one chip. The main specifications of the Galileo E6-b and E6-C codes to facilitate the development of Galileo E6-B/C enabled receivers have already been published.<ref name="GAL_E6-B_E6-C">[https://www.gsc-europa.eu/sites/default/files/sites/all/files/E6BC_SIS_Technical_Note.pdf Galileo E6-B and E6-C ranging codes]</ref>.		The E6 Commercial Service (CS), now High Accuracy Service (HAS), codes are random codes [J. Winkel, 2006] <ref>[J. Winkel, 2006] J. Winkel, Spreading Codes for a Satellite Navigation System, Patent number WO/2006/063613, International Application No.: PCT/EP2004/014488, Publication date: 22 June 2006</ref>. The main idea behind is to generate a family of codes that fulfils the properties of randomness as well as possible [J.-A. Avila-Rodriguez et al., 2007] <ref name="JAV_2007"/>. The codes can be driven to fulfil special properties such as balance and weakened balance, where the probability of 0’s and 1’s must not be identical but within a well-defined range, or to realize the autocorrelation side-lobe zero (ASZ) property. This latter property guarantees that the autocorrelation values of every code correlate to zero with a delayed version of itself, shifted by one chip. The main specifications of the Galileo E6-b and E6-C codes to facilitate the development of Galileo E6-B/C enabled receivers have already been published<ref name="GAL_E6-B_E6-C">[https://www.gsc-europa.eu/sites/default/files/sites/all/files/E6BC_SIS_Technical_Note.pdf Galileo E6-B and E6-C ranging codes]</ref><ref name="GAL_E6BC TN">[https://www.gsc-europa.eu/system/files/galileo_documents/E6BC_SIS_Technical_Note.pdf Galileo E6-BC SIS Technical Note]</ref>.

	::::[[File:Galileo_Signal_Plan_Table_3.png\|none\|thumb\|580px\|'''''Table 3:''''' Galileo E6 signal technical characteristics.]]		::::[[File:Galileo_Signal_Plan_Table_3.png\|none\|thumb\|580px\|'''''Table 3:''''' Galileo E6 signal technical characteristics.]]

← Older revision		Revision as of 10:11, 16 April 2026
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	::[[File:Galileo_Signal_Plan_Eq_1.png\|none\|300px]]		::[[File:Galileo_Signal_Plan_Eq_1.png\|none\|300px]]

	The generic view of the E1 Open Service signal generation can be depicted as follows<ref name="~~GAL_SIS_ICD_2010~~">[https://www.gsc-europa.eu/sites/default/files/sites/all/files/Galileo_OS_SIS_ICD_v2.0.pdf Applicable Galileo OS Signal In Space Interface Control Document (SIS ICD)]</ref>:		The generic view of the E1 Open Service signal generation can be depicted as follows<ref name="GAL_SIS_ICD_2025">[https://www.gsc-europa.eu/sites/default/files/sites/all/files/Galileo_OS_SIS_ICD_v2.2.pdf Applicable Galileo OS Signal In Space Interface Control Document (SIS ICD)]</ref>:

	::::[[File:Galileo_E1_Modulation_scheme.PNG\|none\|thumb\|580px\|'''''Figure 1:''''' Modulation Scheme for the Galileo E1 CBOC Signal, Credits: Galileo OS SIS ICD.]]		::::[[File:Galileo_E1_Modulation_scheme.PNG\|none\|thumb\|580px\|'''''Figure 1:''''' Modulation Scheme for the Galileo E1 CBOC Signal, Credits: Galileo OS SIS ICD.]]
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	It is important to recall that for a long time the actual E1 band received the name of L1 band in analogy with GPS and it was not until the publication of the version of Galileo OS SIS ICD published in ~~2008~~ [Galileo SIS ICD, ~~2008~~] <ref name="~~GAL_SIS_ICD_2008~~"> [Galileo SIS ICD~~, 2008~~] Galileo Open Service Signal In Space Interface Control Document (OS SIS ICD) Draft 1 01/02/2008, 2008 </ref> that L1 changed to the current E1.		It is important to recall that for a long time the actual E1 band received the name of L1 band in analogy with GPS and it was not until the publication of the version of Galileo OS SIS ICD published in 2025 [Galileo SIS ICD, 2025] <ref name="GAL_SIS_ICD_2025">[https://www.gsc-europa.eu/sites/default/files/sites/all/files/Galileo_OS_SIS_ICD_v2.2.pdf Applicable Galileo OS Signal In Space Interface Control Document (SIS ICD)]</ref> Galileo Open Service Signal In Space Interface Control Document (OS SIS ICD) Draft 1 01/02/2008, 2008 </ref> that L1 changed to the current E1.

	The E1 Open Service (OS) codes are, as well as the E6 CS codes that we will see later, also random memory codes. The plain number of choices to set the 0’s and 1’s for the whole code family is enormous and thus special algorithms have to be applied to generate random codes efficiently [J.-A. Avila-Rodriguez et al., 2007] <ref name="JAV_2007"/>.		The E1 Open Service (OS) codes are, as well as the E6 CS codes that we will see later, also random memory codes. The plain number of choices to set the 0’s and 1’s for the whole code family is enormous and thus special algorithms have to be applied to generate random codes efficiently [J.-A. Avila-Rodriguez et al., 2007] <ref name="JAV_2007"/>.
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	E6 signals are modulated with a binary phase shift keying BPSK(5) at a carrier frequency of 1278.75 MHz, which is used by all satellites and shared though a CDMA RF channel access mode.		E6 signals are modulated with a binary phase shift keying BPSK(5) at a carrier frequency of 1278.75 MHz, which is used by all satellites and shared though a CDMA RF channel access mode.

	Therefore, as shown in Galileo OS SIS ICD<ref name="~~GAL_SIS_ICD_2010~~"/>, the transmitted Galileo E6 signal consists of the following components, both (pilot and data components) are combined on the same carrier component, with a power sharing of 50 percent:		Therefore, as shown in Galileo OS SIS ICD<ref name="GAL_SIS_ICD_2025">[https://www.gsc-europa.eu/sites/default/files/sites/all/files/Galileo_OS_SIS_ICD_v2.2.pdf Applicable Galileo OS Signal In Space Interface Control Document (SIS ICD)]</ref>, the transmitted Galileo E6 signal consists of the following components, both (pilot and data components) are combined on the same carrier component, with a power sharing of 50 percent:

	* <math>e_{E6-B}</math> from the C/NAV navigation data stream <math>D_{E6-B}</math> modulated with the encrypted ranging code <math>C_{E6-B}</math>		* <math>e_{E6-B}</math> from the C/NAV navigation data stream <math>D_{E6-B}</math> modulated with the encrypted ranging code <math>C_{E6-B}</math>
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	== Galileo E5 Band ==		== Galileo E5 Band ==

	The different Galileo E5 signal components are generated according to the Galileo OS SIS ICD<ref name="~~GAL_SIS_ICD_2010~~"/>:		The different Galileo E5 signal components are generated according to the Galileo OS SIS ICD<ref name="GAL_SIS_ICD_2025">[https://www.gsc-europa.eu/sites/default/files/sites/all/files/Galileo_OS_SIS_ICD_v2.2.pdf Applicable Galileo OS Signal In Space Interface Control Document (SIS ICD)]</ref>:

	* <math>e_{E5a-I}</math> from the F/NAV navigation data stream <math>D_{E5a-I}</math> modulated with the unencrypted ranging code <math>C_{E5a-I}</math>		* <math>e_{E5a-I}</math> from the F/NAV navigation data stream <math>D_{E5a-I}</math> modulated with the unencrypted ranging code <math>C_{E5a-I}</math>
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	The E5 primary codes can be generated with shift registers. Indeed, the outputs of two parallel registers are modulo-two added to generate the primary codes. For more details on the start values of the primary codes and the corresponding secondary codes of each satellite, refer to Galileo OS SIS ICD<ref name="~~GAL_SIS_ICD_2010~~"/>. Finally, some details on the technical characteristics of the E5 signal are presented.		The E5 primary codes can be generated with shift registers. Indeed, the outputs of two parallel registers are modulo-two added to generate the primary codes. For more details on the start values of the primary codes and the corresponding secondary codes of each satellite, refer to Galileo OS SIS ICD<ref name="GAL_SIS_ICD_2025"/>. Finally, some details on the technical characteristics of the E5 signal are presented.

	::::[[File:Galileo_Signal_Plan_Table_1.png\|none\|thumb\|580px\|'''''Table 4:''''' Galileo E5 signal technical characteristics.]]		::::[[File:Galileo_Signal_Plan_Table_1.png\|none\|thumb\|580px\|'''''Table 4:''''' Galileo E5 signal technical characteristics.]]