GLONASS Future and Evolutions - Revision history

Gema.Cueto: /* User Segment */

2021-05-21T11:39:35Z

User Segment

← Older revision		Revision as of 11:39, 21 May 2021
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	==User Segment==		==User Segment==
	Although the [[:Category:GLONASS\|GLONASS]] constellation is nearing global coverage, its commercialization, especially development of the user segment, has been lacking compared to the U.S. GPS system.<ref name="GLONASS_Wikipedia">[http://en.wikipedia.org/wiki/GLONASS GLONASS on Wikipedia]</ref> To improve the situation, the Russian government has been actively promoting GLONASS for civilian use. According to the Decree of the Government of Russian Federation “About use of GLONASS in technical system and transport vehicles”, August 25 2008, N 641, <ref>[https://www.finpro.fi/c/document_library/get_file?uuid=3a5b031d-b8c7-4c14-88c4-6b91aba76e6f&groupId=10304 FinNode-Services to Russian GLONASS Position system, FINPRO]</ref> GLONASS devices should be used in:		Although the [[:Category:GLONASS\|GLONASS]] constellation is nearing global coverage, its commercialization, especially development of the user segment, has been lacking compared to the U.S. GPS system.<ref name="GLONASS_Wikipedia">[http://en.wikipedia.org/wiki/GLONASS GLONASS on Wikipedia]</ref> To improve the situation, the Russian government has been actively promoting GLONASS for civilian use. According to the Decree of the Government of Russian Federation “About use of GLONASS in technical system and transport vehicles”, August 25 2008, N 641, <ref>[https://www.finpro.fi/c/document_library/get_file?uuid=3a5b031d-b8c7-4c14-88c4-6b91aba76e6f&groupId=10304 FinNode-Services to Russian GLONASS Position system, FINPRO]</ref> GLONASS devices should be used in:
	* All ~~spacecrafts~~ and separate components of them;		* All spacecraft and separate components of them;
	* All civilian and experimental ~~aircrafts~~;		* All civilian and experimental aircraft;
	* All river- and see-going vessels;		* All river- and see-going vessels;
	* All railway and road vehicles for cargo- and passenger transportation;		* All railway and road vehicles for cargo- and passenger transportation;

Claudia.Prajanu at 15:59, 29 June 2018

2018-06-29T15:59:47Z

Paulo.Pombal: /* Ground Segment */

2017-05-19T10:28:20Z

Ground Segment

← Older revision		Revision as of 10:28, 19 May 2017
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	Aiming to improve the interoperability with other GNSS systems, [[Reference Frames in GNSS\|GLONASS coordinate system]] has been tied to the International Terrestrial Reference System (ITR), an international standard. The ephemeris information implementing the [[Reference_Frames_in_GNSS#GLONASS_reference_frame_PZ-90 \| PZ-90.11]] reference system has been implemented on all operational GLONASS satellites starting from 3:00 pm on December 31, 2013<ref>[http://www.glonass-iac.ru/en/content/news/?ELEMENT_ID=721 The transition to using the terrestrial geocentric coordinate system PZ-90.11 in operating GLONASS system has been implemented], Russian Federal Space Agency, Information-analytical centre, 4 April 2014</ref>. From this time on, the satellites are broadcasting in the PZ-90.11. This ECEF reference frame is an updated version of PZ-90, closest to the ITRF2008.		Aiming to improve the interoperability with other GNSS systems, [[Reference Frames in GNSS\|GLONASS coordinate system]] has been tied to the International Terrestrial Reference System (ITR), an international standard. The ephemeris information implementing the [[Reference_Frames_in_GNSS#GLONASS_reference_frame_PZ-90 \| PZ-90.11]] reference system has been implemented on all operational GLONASS satellites starting from 3:00 pm on December 31, 2013<ref>[http://www.glonass-iac.ru/en/content/news/?ELEMENT_ID=721 The transition to using the terrestrial geocentric coordinate system PZ-90.11 in operating GLONASS system has been implemented], Russian Federal Space Agency, Information-analytical centre, 4 April 2014</ref>. From this time on, the satellites are broadcasting in the PZ-90.11. This ECEF reference frame is an updated version of PZ-90, closest to the ITRF2008.

			On March 6th, 2017, a new GLONASS station was officially commissioned in South Africa. That station will monitor GLONASS and GPS satellites’ navigation signals, measurements of current navigation parameters of their travel, and receipt of navigation messages from the satellites.<ref>[http://gpsworld.com/glonass-ground-station-goes-live-in-south-africa/ GLONASS ground station goes live in South Africa]</ref>

	==User Segment==		==User Segment==

Paulo.Pombal: /* Space Segment */

2016-08-05T10:42:16Z

Space Segment

← Older revision		Revision as of 10:42, 5 August 2016
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	Another GLONASS-M satellite was launched sucessfully on May 29, 2016, despite some irregularities with its launcher.		Another GLONASS-M satellite was launched sucessfully on May 29, 2016, despite some irregularities with its launcher.
	<ref>[http://www.insidegnss.com/node/4993 New GLONASS-M Survives Slight Glitch to Reach Orbit]</ref>		<ref>[http://www.insidegnss.com/node/4993 New GLONASS-M Survives Slight Glitch to Reach Orbit]</ref> The satellite became operational on June 27, 2016.<ref>[http://www.insidegnss.com/node/5007 Recently Launched GLONASS-M Becomes Operational]</ref>

	==Ground Segment==		==Ground Segment==

Paulo.Pombal: /* Space Segment */

2016-06-17T15:25:23Z

Space Segment

← Older revision		Revision as of 15:25, 17 June 2016
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	On February 8, 2016, a new GLONASS satellite was launched, intended to replace a 10-year old satellite that ceased operations last October in slot 17, orbital plane 3 of the GLONASS constellation.<ref>[http://www.insidegnss.com/node/4845 Russia Launches First GLONASS-M in More Than a Year]</ref>		On February 8, 2016, a new GLONASS satellite was launched, intended to replace a 10-year old satellite that ceased operations last October in slot 17, orbital plane 3 of the GLONASS constellation.<ref>[http://www.insidegnss.com/node/4845 Russia Launches First GLONASS-M in More Than a Year]</ref>

			Another GLONASS-M satellite was launched sucessfully on May 29, 2016, despite some irregularities with its launcher.
			<ref>[http://www.insidegnss.com/node/4993 New GLONASS-M Survives Slight Glitch to Reach Orbit]</ref>

	==Ground Segment==		==Ground Segment==

Paulo.Pombal: /* Space Segment */

2016-04-10T15:43:57Z

Space Segment

← Older revision		Revision as of 15:43, 10 April 2016
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	A GLONASS-M satellite was launched in April 2013 already planned as a reserve to replace older units.		A GLONASS-M satellite was launched in April 2013 already planned as a reserve to replace older units.

	The first satellite of the third generation, GLONASS-K1, was launched on February 26 2011 while the second one was launched only on November, 30, 2014. The second launch suffered a lot of technical difficulties and should have closed its satellites generation. However, the plan was adjusted and according to Nikolai Testoyedov, CEO of Information Satellite Systems Reshetnev, it is scheduled to be launched another 9 GLONASS-K1 satellites<ref>[2nd GLONASS-K1 Finally Reaches Space], Inside GNSS, December 2, 2014</ref> which have a 10-year design life and carries a CDMA civil signal at L3 band in the 1205 MHz frequency<ref name=glonass-k1-2>[http://gpsworld.com/glonass-k1-to-replace-an-existing-glonass-m-in-six-months/ GLONASS-K1 to Replace an Existing GLONASS-M in Six Months], GPS World, December 15, 2014</ref>.		The first satellite of the third generation, GLONASS-K1, was launched on February 26 2011 while the second one was launched only on November, 30, 2014. The second launch suffered a lot of technical difficulties and should have closed its satellites generation. However, the plan was adjusted and according to Nikolai Testoyedov, CEO of Information Satellite Systems Reshetnev, it is scheduled to be launched another 9 GLONASS-K1 satellites<ref>[2nd GLONASS-K1 Finally Reaches Space], Inside GNSS, December 2, 2014</ref> which have a 10-year design life and carries a CDMA civil signal at L3 band in the 1205 MHz frequency<ref name=glonass-k1-2>[http://gpsworld.com/glonass-k1-to-replace-an-existing-glonass-m-in-six-months/ GLONASS-K1 to Replace an Existing GLONASS-M in Six Months], GPS World, December 15, 2014</ref>. The second GLONASS-K1 began regular broadcasts on February 15, 2016, on channel –6 from its orbital location in plane 2, slot 9 of the GLONASS constellation.<ref>[http://www.insidegnss.com/node/4872 First GLONASS-K Satellite Enters Service]</ref>

	The initial plan was start launching the completely designed from scratch GLONASS-K2 satellites generation by 2014, however the plan was adjusted and the first launch has postponed to 2018<ref name=glonass-k1-2/><ref>[http://gpsworld.com/first-launch-of-glonass-k2-satellite-planned-for-2018/ First Launch of GLONASS-K2 Satellite Planned for 2018], GPS World, April 2, 2015</ref>. The GLONASS-K2 satellites will have a 10-year design life and a clock stability of ~5-1x10-14. In addition to CDMA signals on L3, CDMA signals will also be transmitted on L1 and L2. The GLONASS-K satellites will transmit both legacy FDMA and CDMA signals<ref name="Modernization"></ref>.		The initial plan was start launching the completely designed from scratch GLONASS-K2 satellites generation by 2014, however the plan was adjusted and the first launch has postponed to 2018<ref name=glonass-k1-2/><ref>[http://gpsworld.com/first-launch-of-glonass-k2-satellite-planned-for-2018/ First Launch of GLONASS-K2 Satellite Planned for 2018], GPS World, April 2, 2015</ref>. The GLONASS-K2 satellites will have a 10-year design life and a clock stability of ~5-1x10-14. In addition to CDMA signals on L3, CDMA signals will also be transmitted on L1 and L2. The GLONASS-K satellites will transmit both legacy FDMA and CDMA signals<ref name="Modernization"></ref>.

Paulo.Pombal: /* Space Segment */

2016-04-10T15:19:17Z

Space Segment

← Older revision		Revision as of 15:19, 10 April 2016
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	As reported in <ref name="GLONASS_OnceAndFuture"/>, a modernized GLONASS-K satellite (GLONASS-KM) could transmit (no sooner than 2015) legacy FDMA signals on L1 and L2 and CDMA signals on L1, L2, and L3. It could also transmit CDMA signals on the GPS L5 frequency at 1176.45 MHz. GNSS integrity information could also be broadcast in the third civil signal and global differential ephemeris and time corrections.		As reported in <ref name="GLONASS_OnceAndFuture"/>, a modernized GLONASS-K satellite (GLONASS-KM) could transmit (no sooner than 2015) legacy FDMA signals on L1 and L2 and CDMA signals on L1, L2, and L3. It could also transmit CDMA signals on the GPS L5 frequency at 1176.45 MHz. GNSS integrity information could also be broadcast in the third civil signal and global differential ephemeris and time corrections.

	Also being studied is an alternative to the present three-plane, equally spaced satellite constellation, which would also require the legacy FDMA signals be switched off.<ref name="ConstellationUpdate"/>		Also being studied is an alternative to the present three-plane, equally spaced satellite constellation, which would also require the legacy FDMA signals be switched off.<ref name="ConstellationUpdate"/><br>

			On February 8, 2016, a new GLONASS satellite was launched, intended to replace a 10-year old satellite that ceased operations last October in slot 17, orbital plane 3 of the GLONASS constellation.<ref>[http://www.insidegnss.com/node/4845 Russia Launches First GLONASS-M in More Than a Year]</ref>

	==Ground Segment==		==Ground Segment==

Filipe.Pelica: K2 rescheduled to 2018

2015-04-12T17:05:54Z

K2 rescheduled to 2018

← Older revision		Revision as of 17:05, 12 April 2015
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	The first satellite of the third generation, GLONASS-K1, was launched on February 26 2011 while the second one was launched only on November, 30, 2014. The second launch suffered a lot of technical difficulties and should have closed its satellites generation. However, the plan was adjusted and according to Nikolai Testoyedov, CEO of Information Satellite Systems Reshetnev, it is scheduled to be launched another 9 GLONASS-K1 satellites<ref>[2nd GLONASS-K1 Finally Reaches Space], Inside GNSS, December 2, 2014</ref> which have a 10-year design life and carries a CDMA civil signal at L3 band in the 1205 MHz frequency<ref name=glonass-k1-2>[http://gpsworld.com/glonass-k1-to-replace-an-existing-glonass-m-in-six-months/ GLONASS-K1 to Replace an Existing GLONASS-M in Six Months], GPS World, December 15, 2014</ref>.		The first satellite of the third generation, GLONASS-K1, was launched on February 26 2011 while the second one was launched only on November, 30, 2014. The second launch suffered a lot of technical difficulties and should have closed its satellites generation. However, the plan was adjusted and according to Nikolai Testoyedov, CEO of Information Satellite Systems Reshetnev, it is scheduled to be launched another 9 GLONASS-K1 satellites<ref>[2nd GLONASS-K1 Finally Reaches Space], Inside GNSS, December 2, 2014</ref> which have a 10-year design life and carries a CDMA civil signal at L3 band in the 1205 MHz frequency<ref name=glonass-k1-2>[http://gpsworld.com/glonass-k1-to-replace-an-existing-glonass-m-in-six-months/ GLONASS-K1 to Replace an Existing GLONASS-M in Six Months], GPS World, December 15, 2014</ref>.

	The initial plan was start launching the completely designed from scratch GLONASS-K2 satellites generation, however the plan was adjusted and the first launch has postponed to 2018<ref name=glonass-k1-2/><ref>[http://gpsworld.com/first-launch-of-glonass-k2-satellite-planned-for-2018/ First Launch of GLONASS-K2 Satellite Planned for 2018], GPS World, April 2, 2015</ref>. The GLONASS-K2 satellites will have a 10-year design life and a clock stability of ~5-1x10-14. In addition to CDMA signals on L3, CDMA signals will also be transmitted on L1 and L2. The GLONASS-K satellites will transmit both legacy FDMA and CDMA signals<ref name="Modernization"></ref>.		The initial plan was start launching the completely designed from scratch GLONASS-K2 satellites generation by 2014, however the plan was adjusted and the first launch has postponed to 2018<ref name=glonass-k1-2/><ref>[http://gpsworld.com/first-launch-of-glonass-k2-satellite-planned-for-2018/ First Launch of GLONASS-K2 Satellite Planned for 2018], GPS World, April 2, 2015</ref>. The GLONASS-K2 satellites will have a 10-year design life and a clock stability of ~5-1x10-14. In addition to CDMA signals on L3, CDMA signals will also be transmitted on L1 and L2. The GLONASS-K satellites will transmit both legacy FDMA and CDMA signals<ref name="Modernization"></ref>.

	As reported in <ref name="GLONASS_OnceAndFuture"/>, a modernized GLONASS-K satellite (GLONASS-KM) could transmit (no sooner than 2015) legacy FDMA signals on L1 and L2 and CDMA signals on L1, L2, and L3. It could also transmit CDMA signals on the GPS L5 frequency at 1176.45 MHz. GNSS integrity information could also be broadcast in the third civil signal and global differential ephemeris and time corrections.		As reported in <ref name="GLONASS_OnceAndFuture"/>, a modernized GLONASS-K satellite (GLONASS-KM) could transmit (no sooner than 2015) legacy FDMA signals on L1 and L2 and CDMA signals on L1, L2, and L3. It could also transmit CDMA signals on the GPS L5 frequency at 1176.45 MHz. GNSS integrity information could also be broadcast in the third civil signal and global differential ephemeris and time corrections.

Filipe.Pelica: K2 rescheduled to 2018

2015-04-12T17:02:50Z

K2 rescheduled to 2018

← Older revision		Revision as of 17:02, 12 April 2015
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	A GLONASS-M satellite was launched in April 2013 already planned as a reserve to replace older units.		A GLONASS-M satellite was launched in April 2013 already planned as a reserve to replace older units.

	The first satellite of the third generation, GLONASS-K1, was launched on February 26 2011 while the second one was launched only on November, 30, 2014. The second launch suffered a lot of technical difficulties and should have closed its satellites generation. However, the plan was adjusted and according to Nikolai Testoyedov, CEO of Information Satellite Systems Reshetnev, it is scheduled to be launched another 9 GLONASS-K1 satellites<ref>[ 2nd GLONASS-K1 Finally Reaches Space], Inside GNSS, December 2, 2014</ref> which have a 10-year design life and carries a CDMA civil signal at L3 band in the 1205 MHz frequency<ref name=glonass-k1-2>[http://gpsworld.com/glonass-k1-to-replace-an-existing-glonass-m-in-six-months/ GLONASS-K1 to Replace an Existing GLONASS-M in Six Months], GPS World, December 15, 2014</ref>.		The first satellite of the third generation, GLONASS-K1, was launched on February 26 2011 while the second one was launched only on November, 30, 2014. The second launch suffered a lot of technical difficulties and should have closed its satellites generation. However, the plan was adjusted and according to Nikolai Testoyedov, CEO of Information Satellite Systems Reshetnev, it is scheduled to be launched another 9 GLONASS-K1 satellites<ref>[2nd GLONASS-K1 Finally Reaches Space], Inside GNSS, December 2, 2014</ref> which have a 10-year design life and carries a CDMA civil signal at L3 band in the 1205 MHz frequency<ref name=glonass-k1-2>[http://gpsworld.com/glonass-k1-to-replace-an-existing-glonass-m-in-six-months/ GLONASS-K1 to Replace an Existing GLONASS-M in Six Months], GPS World, December 15, 2014</ref>.

	The initial plan was start launching the completely designed from scratch GLONASS-K2 satellites generation, however the plan was adjusted and the ~~launches have been~~ postponed ~~for at least 1 year or 2~~<ref name=glonass-k1-2/>. The GLONASS-K2 satellites will have a 10-year design life and a clock stability of ~5-1x10-14. In addition to CDMA signals on L3, CDMA signals will also be transmitted on L1 and L2. The GLONASS-K satellites will transmit both legacy FDMA and CDMA signals<ref name="Modernization"></ref>.		The initial plan was start launching the completely designed from scratch GLONASS-K2 satellites generation, however the plan was adjusted and the first launch has postponed to 2018<ref name=glonass-k1-2/><ref>[http://gpsworld.com/first-launch-of-glonass-k2-satellite-planned-for-2018/ First Launch of GLONASS-K2 Satellite Planned for 2018], GPS World, April 2, 2015</ref>. The GLONASS-K2 satellites will have a 10-year design life and a clock stability of ~5-1x10-14. In addition to CDMA signals on L3, CDMA signals will also be transmitted on L1 and L2. The GLONASS-K satellites will transmit both legacy FDMA and CDMA signals<ref name="Modernization"></ref>.

	As reported in <ref name="GLONASS_OnceAndFuture"/>, a modernized GLONASS-K satellite (GLONASS-KM) could transmit (no sooner than 2015) legacy FDMA signals on L1 and L2 and CDMA signals on L1, L2, and L3. It could also transmit CDMA signals on the GPS L5 frequency at 1176.45 MHz. GNSS integrity information could also be broadcast in the third civil signal and global differential ephemeris and time corrections.		As reported in <ref name="GLONASS_OnceAndFuture"/>, a modernized GLONASS-K satellite (GLONASS-KM) could transmit (no sooner than 2015) legacy FDMA signals on L1 and L2 and CDMA signals on L1, L2, and L3. It could also transmit CDMA signals on the GPS L5 frequency at 1176.45 MHz. GNSS integrity information could also be broadcast in the third civil signal and global differential ephemeris and time corrections.

Filipe.Pelica: K2 rescheduled to 2018

2015-04-12T16:58:22Z

K2 rescheduled to 2018

← Older revision		Revision as of 16:58, 12 April 2015
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	The GLONASS L3 signal is centered at 1207.14 MHz, the same frequency as Galileo/BeiDou signal E5b, in the region allocated to the Aeronautical Radio 1 Navigation Service (ARNS). These bands are especially suitable for Safety-of-Life applications because no other users are allowed to interfere with their signals.		The GLONASS L3 signal is centered at 1207.14 MHz, the same frequency as Galileo/BeiDou signal E5b, in the region allocated to the Aeronautical Radio 1 Navigation Service (ARNS). These bands are especially suitable for Safety-of-Life applications because no other users are allowed to interfere with their signals.

	The future GLONASS K2 satellites ~~to be launched in 2014,~~ will feature four additional CDMA signals along the original FDMA signals. Two of them are obfuscated signals located at 1242 MHz (L2 band) and 1575.42 MHz (L1 band) for military uses and the other two are open signals located at 1575.42 MHz (L1 band) and 1207.14 MHz (L3 band) for civil uses.<ref name="Modernization">[http://www.oosa.unvienna.org/pdf/sap/2012/un-latvia/ppt/1-2.pdf GLONASS Status and Modernization]</ref>		The future GLONASS K2 satellites will feature four additional CDMA signals along the original FDMA signals. Two of them are obfuscated signals located at 1242 MHz (L2 band) and 1575.42 MHz (L1 band) for military uses and the other two are open signals located at 1575.42 MHz (L1 band) and 1207.14 MHz (L3 band) for civil uses.<ref name="Modernization">[http://www.oosa.unvienna.org/pdf/sap/2012/un-latvia/ppt/1-2.pdf GLONASS Status and Modernization]</ref>

	A modernized GLONASS-K satellite, GLONASS-KM, for launch after 2015 <ref name="ConstellationUpdate">[http://www.gpsworld.com/gnss-system/glonass/news/glonass-update-delves-constellation-details-10499 GLONASS Update Delves into Constellation Details, GPSworld]</ref> may also transmit on the L5 frequency at 1176.45 MHz, the same as the modernized GPS signal L5 and Galileo signal E5a.		A modernized GLONASS-K satellite, GLONASS-KM, for launch after 2015 <ref name="ConstellationUpdate">[to http://www.gpsworld.com/gnss-system/glonass/news/glonass-update-delves-constellation-details-10499 GLONASS Update Delves into Constellation Details, GPSworld]</ref> may also transmit on the L5 frequency at 1176.45 MHz, the same as the modernized GPS signal L5 and Galileo signal E5a.

	==Space Segment==		==Space Segment==

← Older revision		Revision as of 15:59, 29 June 2018
Line 9:		Line 9:
	The Government of the Russian Federation, acknowledging that navigation satellite system [[:Category:GLONASS\|GLONASS]] was a top priority, approved by its Decree No. 587 of 20 August 2001, a Federal Task Program on the Global Navigation System (GNS) <ref>[http://groups.itu.int/Portals/19/activeforums_Attach/GLONASS%20Commitment%20Ltr.pdf Federal Task Program on the Global Navigation System]</ref>. The GNS Program aims at improving both the space, ground-based and user equipment segments of the [[:Category:GLONASS\|GLONASS]] system.		The Government of the Russian Federation, acknowledging that navigation satellite system [[:Category:GLONASS\|GLONASS]] was a top priority, approved by its Decree No. 587 of 20 August 2001, a Federal Task Program on the Global Navigation System (GNS) <ref>[http://groups.itu.int/Portals/19/activeforums_Attach/GLONASS%20Commitment%20Ltr.pdf Federal Task Program on the Global Navigation System]</ref>. The GNS Program aims at improving both the space, ground-based and user equipment segments of the [[:Category:GLONASS\|GLONASS]] system.
	Actually the program aims at ensuring that [[:Category:GLONASS\|GLONASS]] performances are similar to those of GPS.		Actually the program aims at ensuring that [[:Category:GLONASS\|GLONASS]] performances are similar to those of GPS.
	The fact that [[:Category:GLONASS\|GLONASS]] performances are worse than those of GPS are due to several factors, including the performances of the on-board atomic clocks, the number of satellites in the constellation and the fact that ground segment monitoring and control was limited to the Russian territory. By 2010, GLONASS reached full coverage in Russian territory and in 2011 full operational capability with the full orbital constellation of 24 satellites. GLONASS had a 347 billion ruble (US$11.81) budget approved through 2020, by which time the system is scheduled to have all satellites transmitting both the new CDMA and legacy FDMA signals<ref name="Munich2012">[http://~~www.~~insidegnss.com/~~node~~/~~2981~~ Munich Summit Charts Progress of GPS, GLONASS, Galileo, Beidou GNSSes, InsideGNSS, March 2012]</ref>.		The fact that [[:Category:GLONASS\|GLONASS]] performances are worse than those of GPS are due to several factors, including the performances of the on-board atomic clocks, the number of satellites in the constellation and the fact that ground segment monitoring and control was limited to the Russian territory. By 2010, GLONASS reached full coverage in Russian territory and in 2011 full operational capability with the full orbital constellation of 24 satellites. GLONASS had a 347 billion ruble (US$11.81) budget approved through 2020, by which time the system is scheduled to have all satellites transmitting both the new CDMA and legacy FDMA signals<ref name="Munich2012">[http://insidegnss.com/munich-summit-charts-progress-of-gps-glonass-galileo-beidou-gnsses/ Munich Summit Charts Progress of GPS, GLONASS, Galileo, Beidou GNSSes, InsideGNSS, March 2012]</ref>.


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	Aiming to provide better accuracy, multipath resistance and especially, greater interoperability with [[:Category:GPS\|GPS]] and future [[:Category:GALILEO\|GALILEO]] and other GNSS Systems, new GLONASS-K satellites will transmit CDMA signals in addition to the system’s traditional FDMA.		Aiming to provide better accuracy, multipath resistance and especially, greater interoperability with [[:Category:GPS\|GPS]] and future [[:Category:GALILEO\|GALILEO]] and other GNSS Systems, new GLONASS-K satellites will transmit CDMA signals in addition to the system’s traditional FDMA.
	In fact, since the successful launch of the first GLONASS K1 satellite, <ref>[http://~~www.~~insidegnss.com/~~node~~/~~2487~~ Russia’s First GLONASS-K In Orbit, CDMA Signals Coming, insideGNSS]</ref> a new L3 CDMA signal is already being transmitting and tracked by several receiver companies.		In fact, since the successful launch of the first GLONASS K1 satellite, <ref>[http://insidegnss.com/russias-first-glonass-k-in-orbit-cdma-signals-coming/ Russia’s First GLONASS-K In Orbit, CDMA Signals Coming, insideGNSS]</ref> a new L3 CDMA signal is already being transmitting and tracked by several receiver companies.
	The GLONASS L3 signal is centered at 1207.14 MHz, the same frequency as Galileo/BeiDou signal E5b, in the region allocated to the Aeronautical Radio 1 Navigation Service (ARNS). These bands are especially suitable for Safety-of-Life applications because no other users are allowed to interfere with their signals.		The GLONASS L3 signal is centered at 1207.14 MHz, the same frequency as Galileo/BeiDou signal E5b, in the region allocated to the Aeronautical Radio 1 Navigation Service (ARNS). These bands are especially suitable for Safety-of-Life applications because no other users are allowed to interfere with their signals.

	The future GLONASS K2 satellites will feature four additional CDMA signals along the original FDMA signals. Two of them are obfuscated signals located at 1242 MHz (L2 band) and 1575.42 MHz (L1 band) for military uses and the other two are open signals located at 1575.42 MHz (L1 band) and 1207.14 MHz (L3 band) for civil uses.<ref name="Modernization">[http://www.~~oosa.unvienna~~.org/pdf/~~sap~~/2012/un-latvia/ppt/1-2.pdf GLONASS Status and Modernization]</ref>		The future GLONASS K2 satellites will feature four additional CDMA signals along the original FDMA signals. Two of them are obfuscated signals located at 1242 MHz (L2 band) and 1575.42 MHz (L1 band) for military uses and the other two are open signals located at 1575.42 MHz (L1 band) and 1207.14 MHz (L3 band) for civil uses.<ref name="Modernization">[http://www.unoosa.org/documents/pdf/psa/activities/2012/un-latvia/ppt/1-2.pdf GLONASS Status and Modernization]</ref>

	A modernized GLONASS-K satellite, GLONASS-KM, for launch after 2015 <ref name="ConstellationUpdate">[to http://~~www.~~gpsworld.com/~~gnss-system/glonass/news/glonass-update-delves-constellation-details-10499~~ GLONASS Update Delves into Constellation Details, GPSworld]</ref> may also transmit on the L5 frequency at 1176.45 MHz, the same as the modernized GPS signal L5 and Galileo signal E5a.		A modernized GLONASS-K satellite, GLONASS-KM, for launch after 2015 <ref name="ConstellationUpdate">[to http://gpsworld.com/ GLONASS Update Delves into Constellation Details, GPSworld]</ref> may also transmit on the L5 frequency at 1176.45 MHz, the same as the modernized GPS signal L5 and Galileo signal E5a.

	==Space Segment==		==Space Segment==
	[[File:GLONASS_SpaceSegmentModernization.JPG\|400px\|GLONASS Space Segment Modernization\|right\|thumb]]		[[File:GLONASS_SpaceSegmentModernization.JPG\|400px\|GLONASS Space Segment Modernization\|right\|thumb]]
	[[:GLONASS Space Segment\|GLONASS Space Segment]] modernization, began with the second generation of satellites, GLONASS-M. Reserved bytes in the navigation message were used to provide the divergence of GPS and GLONASS time scales, the navigation frame authenticity (validity) flags, and age of data information.<ref name="GLONASS_OnceAndFuture">[http://~~www.~~insidegnss.com/~~node~~/~~503~~ GLONASS: The Once and Future GNSS, InsideGNSS]</ref> New filters allowed the reduction of out-of-band emissions and on-board clock stability over 24 hours was improved from 5x10-13 to 1x10-13.		[[:GLONASS Space Segment\|GLONASS Space Segment]] modernization, began with the second generation of satellites, GLONASS-M. Reserved bytes in the navigation message were used to provide the divergence of GPS and GLONASS time scales, the navigation frame authenticity (validity) flags, and age of data information.<ref name="GLONASS_OnceAndFuture">[http://insidegnss.com/glonass-the-once-and-future-gnss/ GLONASS: The Once and Future GNSS, InsideGNSS]</ref> New filters allowed the reduction of out-of-band emissions and on-board clock stability over 24 hours was improved from 5x10-13 to 1x10-13.
	A GLONASS-M satellite was launched in April 2013 already planned as a reserve to replace older units.		A GLONASS-M satellite was launched in April 2013 already planned as a reserve to replace older units.

	The first satellite of the third generation, GLONASS-K1, was launched on February 26 2011 while the second one was launched only on November, 30, 2014. The second launch suffered a lot of technical difficulties and should have closed its satellites generation. However, the plan was adjusted and according to Nikolai Testoyedov, CEO of Information Satellite Systems Reshetnev, it is scheduled to be launched another 9 GLONASS-K1 satellites<ref>[2nd GLONASS-K1 Finally Reaches Space], Inside GNSS, December 2, 2014</ref> which have a 10-year design life and carries a CDMA civil signal at L3 band in the 1205 MHz frequency<ref name=glonass-k1-2>[http://gpsworld.com/glonass-k1-to-replace-an-existing-glonass-m-in-six-months/ GLONASS-K1 to Replace an Existing GLONASS-M in Six Months], GPS World, December 15, 2014</ref>. The second GLONASS-K1 began regular broadcasts on February 15, 2016, on channel –6 from its orbital location in plane 2, slot 9 of the GLONASS constellation.<ref>[http://~~www.~~insidegnss.com/~~node~~/~~4872~~ First GLONASS-K Satellite Enters Service]</ref>		The first satellite of the third generation, GLONASS-K1, was launched on February 26 2011 while the second one was launched only on November, 30, 2014. The second launch suffered a lot of technical difficulties and should have closed its satellites generation. However, the plan was adjusted and according to Nikolai Testoyedov, CEO of Information Satellite Systems Reshetnev, it is scheduled to be launched another 9 GLONASS-K1 satellites<ref>[2nd GLONASS-K1 Finally Reaches Space], Inside GNSS, December 2, 2014</ref> which have a 10-year design life and carries a CDMA civil signal at L3 band in the 1205 MHz frequency<ref name=glonass-k1-2>[http://gpsworld.com/glonass-k1-to-replace-an-existing-glonass-m-in-six-months/ GLONASS-K1 to Replace an Existing GLONASS-M in Six Months], GPS World, December 15, 2014</ref>. The second GLONASS-K1 began regular broadcasts on February 15, 2016, on channel –6 from its orbital location in plane 2, slot 9 of the GLONASS constellation.<ref>[http://insidegnss.com/first-glonass-k-satellite-enters-service/ First GLONASS-K Satellite Enters Service]</ref>

	The initial plan was start launching the completely designed from scratch GLONASS-K2 satellites generation by 2014, however the plan was adjusted and the first launch has postponed to 2018<ref name=glonass-k1-2/><ref>[http://gpsworld.com/first-launch-of-glonass-k2-satellite-planned-for-2018/ First Launch of GLONASS-K2 Satellite Planned for 2018], GPS World, April 2, 2015</ref>. The GLONASS-K2 satellites will have a 10-year design life and a clock stability of ~5-1x10-14. In addition to CDMA signals on L3, CDMA signals will also be transmitted on L1 and L2. The GLONASS-K satellites will transmit both legacy FDMA and CDMA signals<ref name="Modernization"></ref>.		The initial plan was start launching the completely designed from scratch GLONASS-K2 satellites generation by 2014, however the plan was adjusted and the first launch has postponed to 2018<ref name=glonass-k1-2/><ref>[http://gpsworld.com/first-launch-of-glonass-k2-satellite-planned-for-2018/ First Launch of GLONASS-K2 Satellite Planned for 2018], GPS World, April 2, 2015</ref>. The GLONASS-K2 satellites will have a 10-year design life and a clock stability of ~5-1x10-14. In addition to CDMA signals on L3, CDMA signals will also be transmitted on L1 and L2. The GLONASS-K satellites will transmit both legacy FDMA and CDMA signals<ref name="Modernization"></ref>.
Line 37:		Line 37:
	Also being studied is an alternative to the present three-plane, equally spaced satellite constellation, which would also require the legacy FDMA signals be switched off.<ref name="ConstellationUpdate"/><br>		Also being studied is an alternative to the present three-plane, equally spaced satellite constellation, which would also require the legacy FDMA signals be switched off.<ref name="ConstellationUpdate"/><br>

	On February 8, 2016, a new GLONASS satellite was launched, intended to replace a 10-year old satellite that ceased operations last October in slot 17, orbital plane 3 of the GLONASS constellation.<ref>[http://~~www.~~insidegnss.com/~~node~~/~~4845~~ Russia Launches First GLONASS-M in More Than a Year]</ref>		On February 8, 2016, a new GLONASS satellite was launched, intended to replace a 10-year old satellite that ceased operations last October in slot 17, orbital plane 3 of the GLONASS constellation.<ref>[http://insidegnss.com/russia-launches-first-glonass-m-in-more-than-a-year/ Russia Launches First GLONASS-M in More Than a Year]</ref>

	Another GLONASS-M satellite was launched sucessfully on May 29, 2016, despite some irregularities with its launcher.		Another GLONASS-M satellite was launched sucessfully on May 29, 2016, despite some irregularities with its launcher.
	<ref>[http://~~www.~~insidegnss.com/~~node~~/~~4993~~ New GLONASS-M Survives Slight Glitch to Reach Orbit]</ref> The satellite became operational on June 27, 2016.<ref>[http://~~www.~~insidegnss.com/~~node~~/~~5007~~ Recently Launched GLONASS-M Becomes Operational]</ref>		<ref>[http://insidegnss.com/new-glonass-m-survives-slight-glitch-to-reach-orbit/ New GLONASS-M Survives Slight Glitch to Reach Orbit]</ref> The satellite became operational on June 27, 2016.<ref>[http://insidegnss.com/recently-launched-glonass-m-becomes-operational/ Recently Launched GLONASS-M Becomes Operational]</ref>

	==Ground Segment==		==Ground Segment==
	Fifteen new reference statiosn will be added, six of them outside the Russian territory, being the first one already placed in Antarctica.<ref>[http://~~www.~~gpsworld.com/~~gnss-system/glonass/news/glonass-up-date-and-out-state-9710~~ GLONASS Up to Date and Out of State, GPSWorld]</ref>		Fifteen new reference statiosn will be added, six of them outside the Russian territory, being the first one already placed in Antarctica.<ref>[http://gpsworld.com/ GLONASS Up to Date and Out of State, GPSWorld]</ref>

	Also, the developments of both the [[:Category:GLONASS\|GLONASS]] tracking capabilities as well as the steady increase in the number of [[:Category:GLONASS\|GLONASS]] satellites, has had a positive influence on the accuracy of the [[:Category:GLONASS\|GLONASS]] orbits and clocks. For instance, according to the GPSWorld article “Innovation: GPS, GLONASS, and More”<ref>[http://gpsworld.com/~~gnss-systemglonassinnovation~~-gps-glonass-and-more~~-10007~~/ Innovation: GPS, GLONASS, and More, GPSWorld]</ref> in 2008, the orbit quality, was at the 120-millimeter level (cross-track), which was improved significantly to the 85-millimeter level by the end of 2009.		Also, the developments of both the [[:Category:GLONASS\|GLONASS]] tracking capabilities as well as the steady increase in the number of [[:Category:GLONASS\|GLONASS]] satellites, has had a positive influence on the accuracy of the [[:Category:GLONASS\|GLONASS]] orbits and clocks. For instance, according to the GPSWorld article “Innovation: GPS, GLONASS, and More”<ref>[http://gpsworld.com/innovation-gps-glonass-and-more/ Innovation: GPS, GLONASS, and More, GPSWorld]</ref> in 2008, the orbit quality, was at the 120-millimeter level (cross-track), which was improved significantly to the 85-millimeter level by the end of 2009.

	Aiming to improve the interoperability with other GNSS systems, [[Reference Frames in GNSS\|GLONASS coordinate system]] has been tied to the International Terrestrial Reference System (ITR), an international standard. The ephemeris information implementing the [[Reference_Frames_in_GNSS#GLONASS_reference_frame_PZ-90 \| PZ-90.11]] reference system has been implemented on all operational GLONASS satellites starting from 3:00 pm on December 31, 2013<ref>[http://www.glonass-iac.ru/en/content/news/?ELEMENT_ID=721 The transition to using the terrestrial geocentric coordinate system PZ-90.11 in operating GLONASS system has been implemented], Russian Federal Space Agency, Information-analytical centre, 4 April 2014</ref>. From this time on, the satellites are broadcasting in the PZ-90.11. This ECEF reference frame is an updated version of PZ-90, closest to the ITRF2008.		Aiming to improve the interoperability with other GNSS systems, [[Reference Frames in GNSS\|GLONASS coordinate system]] has been tied to the International Terrestrial Reference System (ITR), an international standard. The ephemeris information implementing the [[Reference_Frames_in_GNSS#GLONASS_reference_frame_PZ-90 \| PZ-90.11]] reference system has been implemented on all operational GLONASS satellites starting from 3:00 pm on December 31, 2013<ref>[http://www.glonass-iac.ru/en/content/news/?ELEMENT_ID=721 The transition to using the terrestrial geocentric coordinate system PZ-90.11 in operating GLONASS system has been implemented], Russian Federal Space Agency, Information-analytical centre, 4 April 2014</ref>. From this time on, the satellites are broadcasting in the PZ-90.11. This ECEF reference frame is an updated version of PZ-90, closest to the ITRF2008.