Editing Satellite navigation (section)

==Regional navigation satellite systems==

===NavIC===
{{Main|NavIC}}
The '''NavIC''' (acronym for '''Navigation with Indian Constellation''') is an autonomous regional satellite navigation system developed by the [[Indian Space Research Organisation]] (ISRO). The [[Government of India|Indian government]] approved the project in May 2006. It consists of a constellation of 7 navigational satellites.<ref>{{cite web|url=http://www.rediff.com/news/2007/sep/27gps.htm |title=India to develop its own version of GPS |work=Rediff.com |access-date=2011-12-30}}</ref> Three of the satellites are placed in [[Geostationary orbit|geostationary orbit (GEO)]] and the remaining 4 in [[Geosynchronous orbit|geosynchronous orbit (GSO)]] to have a larger signal footprint and lower number of satellites to map the region. It is intended to provide an all-weather absolute position accuracy of better than {{convert|7.6|m}} throughout [[India]] and within a region extending approximately {{convert|1500|km|abbr=on}} around it.<ref>{{cite web|author=S. Anandan |url=http://www.thehindu.com/sci-tech/article393892.ece |title=Launch of first satellite for Indian Regional Navigation Satellite system next year |publisher=Beta.thehindu.com |date=2010-04-10 |access-date=2011-12-30}}</ref> An Extended Service Area lies between the primary service area and a rectangle area enclosed by the [[30th parallel south]] to the [[50th parallel north]] and the [[30th meridian east]] to the [[130th meridian east]], 1,500–6,000 km beyond borders.<ref>{{Cite web|title=IRNSS Programme - ISRO|url=https://www.isro.gov.in/irnss-programme|access-date=2018-07-14|website=www.isro.gov.in|language=en|archive-date=2022-03-02|archive-url=https://web.archive.org/web/20220302041206/https://www.isro.gov.in/irnss-programme|url-status=dead}}</ref> A goal of complete Indian control has been stated, with the [[Satellite space segment|space segment]], [[ground segment]] and user receivers all being built in India.<ref>{{cite web|url=http://www.livemint.com/2007/09/05002237/India-to-build-a-constellation.html |title=India to build a constellation of 7 navigation satellites by 2012 |publisher=Livemint.com |date=2007-09-05 |access-date=2011-12-30}}</ref>

The constellation was in orbit as of 2018, and the system was available for public use in early 2018.<ref>{{cite web|url=https://www.ibtimes.co.in/indias-own-gps-irnss-navic-made-by-isro-go-live-early-2018-728409|title=India's own GPS IRNSS NavIC made by ISRO to go live in early 2018|website=International Business Times|date=28 May 2017|access-date=29 April 2021|author=Rohit KVN}}</ref> NavIC provides two levels of service, the "standard positioning service", which will be open for civilian use, and a "restricted service" (an [[Encryption|encrypted]] one) for authorized users (including military). There are plans to expand NavIC system by increasing constellation size from 7 to 11.<ref name=":0">{{Cite news|url=https://economictimes.indiatimes.com/news/science/navigation-satellite-clocks-ticking-system-to-be-expanded-isro/articleshow/59082657.cms|title=Navigation satellite clocks ticking; system to be expanded: ISRO|last=IANS|date=2017-06-10|work=The Economic Times|access-date=2018-01-24}}</ref>

India plans to make the NavIC global by adding 24 more [[Medium Earth orbit|MEO]] satellites. The Global NavIC will be free to use for the global public.<ref>{{cite news |title=ISRO to boost NavIC, widen user base of location system |first=Jacob |last=Koshy |work=[[The Hindu]] |date=October 26, 2022 |url=https://www.thehindu.com/news/national/isro-to-upgrade-indian-gps-navic-to-widen-user-base/article66056505.ece |url-access=subscription |url-status=live |archive-url=https://web.archive.org/web/20230920113926/https://www.thehindu.com/news/national/isro-to-upgrade-indian-gps-navic-to-widen-user-base/article66056505.ece |archive-date= Sep 20, 2023 }}</ref>

===Early BeiDou===
{{Main|BeiDou-1|BeiDou-2}}
The first two generations of China's BeiDou navigation system were designed to provide regional coverage.

===Korea===
{{Main|Korean Positioning System}}
The Korean Positioning System (KPS) is currently in development and expected to be operational by 2035.<ref name="l316">{{cite web | last=Byung-wook | first=Kim | title=LIG Nex1 to develop Korea's own satellite navigation system | website=The Korea Herald | date=2021-09-26 | url=https://www.koreaherald.com/article/2695812 | language=ko | access-date=2025-02-24}}</ref><ref name="f292">{{cite journal | last1=Choi | first1=Byung-Kyu | last2=Roh | first2=Kyoung-Min | last3=Ge | first3=Haibo | last4=Ge | first4=Maorong | last5=Joo | first5=Jung-Min | last6=Heo | first6=Moon Beom | title=Performance Analysis of the Korean Positioning System Using Observation Simulation | journal=Remote Sensing | volume=12 | issue=20 | date=2020-10-15 | issn=2072-4292 | doi=10.3390/rs12203365 | doi-access=free | page=3365| bibcode=2020RemS...12.3365C }}</ref>