Editing GLONASS (section)

== Status ==
=== Availability ===
[[File:GPSTest screenshot (2025).webp|thumb|Screenshot of GPSTest application showing GLONASS satellites usage in [[South Tangerang]], [[Indonesia]] (2025)]]
{{as of|2024|February|17}}, the GLONASS constellation status is:<ref name="auto">{{cite web |title=Constellation status |url=https://glonass-iac.ru/en/sostavOG/ |access-date=2024-02-17 |website=glonass-iac.ru }}</ref>

{| class="wikitable" style="text-align:center;"
|-
! style="text-align:left;"| Total
| 26 SC
|-
! style="text-align:left;"| Operational
| 24 SC (Glonass-M/K)
|-
! style="text-align:left;"| In commissioning
| 0 SC
|-
! style="text-align:left;"| In maintenance
| 0 SC
|-
! style="text-align:left;"| Under check by the Satellite Prime Contractor
| 0 SC
|-
! style="text-align:left;"| Spares
| 0 SC
|-
! style="text-align:left;"| In flight tests phase
| 2 SC
|-
|}

The system requires 18 satellites for continuous navigation services covering all of Russia, and 24 satellites to provide services worldwide.{{citation needed|date=February 2023}} The GLONASS system covers 100% of worldwide territory.

On 2 April 2014, the system experienced a technical failure that resulted in practical unavailability of the navigation signal for around 12 hours.<ref name="izvestia">{{cite news|url=http://izvestia.ru/news/568647|title=Роскосмос ищет причины сбоя ГЛОНАСС|newspaper=Izvestia|year=2014|access-date=5 April 2014|archive-date=25 December 2015|archive-url=https://web.archive.org/web/20151225113907/http://izvestia.ru/news/568647|url-status=live}}</ref>

On 14–15 April 2014, nine GLONASS satellites experienced a technical failure due to software problems.<ref name="novaya gazeta">{{cite news|url=https://www.novayagazeta.ru/news/2014/04/15/99404-sistema-glonass-vyshla-iz-stroya-vtoroy-raz-za-mesyats|title=Система ГЛОНАСС вышла из строя второй раз за месяц|newspaper=Новая Газета |year=2014|access-date=10 March 2019|archive-date=2 April 2019|archive-url=https://web.archive.org/web/20190402153920/https://www.novayagazeta.ru/news/2014/04/15/99404-sistema-glonass-vyshla-iz-stroya-vtoroy-raz-za-mesyats|url-status=live}}</ref>

On 19 February 2016, three GLONASS satellites experienced a technical failure: the batteries of GLONASS-738 exploded, the batteries of GLONASS-737 were depleted, and GLONASS-736 experienced a stationkeeping failure due to human error during maneuvering. GLONASS-737 and GLONASS-736 were expected to be operational again after maintenance, and one new satellite (GLONASS-751) to replace GLONASS-738 was expected to complete commissioning in early March 2016. The full capacity of the satellite group was expected to be restored in the middle of March 2016.<ref>{{cite news|url=http://izvestia.ru/news/604492|title=Роскосмос обещает восстановить ГЛОНАСС к середине марта|newspaper=Известия |date=18 February 2016|access-date=26 February 2016|archive-date=27 February 2016|archive-url=https://web.archive.org/web/20160227002848/http://izvestia.ru/news/604492|url-status=live}}</ref>

After the launching of two new satellites and maintenance of two others, the full capacity of the satellite group was restored.

=== Accuracy ===
According to Russian System of Differentional Correction and Monitoring's data, {{as of|2010|lc=on}}, precision of GLONASS navigation definitions (for p=0.95) for latitude and longitude were {{cvt|4.46|–|7.38|m}} with mean number of navigation space vehicles (NSV) equals 7—8 (depending on station). In comparison, the same time precision of GPS [[navigation]] definitions were {{cvt|2.00|–|8.76|m}} with mean number of NSV equals 6—11 (depending on station).

Some modern receivers are able to use both GLONASS and GPS satellites together, providing greatly improved coverage in urban canyons and giving a very fast time to fix due to over 50 satellites being available. In indoor, urban canyon or mountainous areas, accuracy can be greatly improved over using GPS alone. For using both navigation systems simultaneously, precision of GLONASS/GPS navigation definitions were {{cvt|2.37|–|4.65|m}} with mean number of NSV equals 14—19 (depends on station).

In May 2009, [[Anatoly Perminov]], then director of the [[Roscosmos]], stated that actions were undertaken to expand GLONASS's constellation and to improve the [[ground segment]] to increase the navigation definition of GLONASS to an accuracy of {{cvt|2.8|m}} by 2011.<ref name="pr_rianscience">{{cite web|url=http://www.rian.ru/science/20090512/170848130.html|title=Роскосмос обещает повысить точность работы ГЛОНАСС с 10 до 5,5 метров|date=12 May 2009|publisher=РИА Новости|access-date=2 September 2015|archive-date=29 May 2010|archive-url=https://web.archive.org/web/20100529064042/http://www.rian.ru/science/20090512/170848130.html|url-status=live}}</ref> In particular, the latest satellite design, [[GLONASS-K]] has the ability to double the system's accuracy once introduced. The system's ground segment is also to undergo improvements. As of early 2012, sixteen positioning ground stations are under construction in [[Russia]] and in the [[Antarctic]] at the [[Bellingshausen Station|Bellingshausen]] and [[Novolazarevskaya Station|Novolazarevskaya]] bases. New stations will be built around the southern hemisphere from [[Brazil]] to [[Indonesia]]. Together, these improvements are expected to bring GLONASS' accuracy to 0.6 m or better by 2020.<ref name="kramnik_feb2012">{{cite news|url=http://rbth.ru/articles/2012/02/16/glonass_benefits_worth_the_extra_expense_14862.html|title=GLONASS benefits worth the extra expense|last1=Kramnik|first1=Ilya|newspaper=Russia Beyond the Headlines|date=2012-02-16|access-date=22 February 2012|archive-date=22 February 2012|archive-url=https://web.archive.org/web/20120222100105/http://rbth.ru/articles/2012/02/16/glonass_benefits_worth_the_extra_expense_14862.html|url-status=live}}</ref> The setup of a GLONASS receiving station in the [[Philippines]] is also now under negotiation.<ref>{{cite news|title=DOST Finalizes MOU with Russian Space Agency|url=https://www.dfa.gov.ph/dfa-news/news-from-our-foreign-service-postsupdate/17790-dost-finalizes-mou-with-russian-space-agency|access-date=24 September 2018|publisher=Department of Foreign Affairs (Philippines)|date=7 September 2018|archive-date=25 September 2018|archive-url=https://web.archive.org/web/20180925104330/https://www.dfa.gov.ph/dfa-news/news-from-our-foreign-service-postsupdate/17790-dost-finalizes-mou-with-russian-space-agency|url-status=live}}</ref>