 Logo of NavIC | |
| Country/ies of origin | India |
|---|---|
| Operator | ISRO |
| Type | Military, Commercial |
| Status | Operational |
| Coverage | Regional (up to 1,500 km or 930 mi from borders) |
| Accuracy | 3 m or 9.8 ft (public) 2 m or 6 ft 7 in (encrypted) |
| Constellation size | |
| Nominal satellites | 7 |
| Current usable satellites | |
| First launch | 1 July 2013; 12 years ago (1 July 2013) |
| Last launch | 29 January 2025 |
| Total launches | 11 |
| Orbital characteristics | |
| Regime(s) | geostationary orbit (GEO),inclined geosynchronous orbit (IGSO) |
| Orbital height | 35,786 km (22,236 mi) |
| Other details | |
| Cost | ₹2,246crore (US$266 million) as of March 2017[1] |
| Geodesy | ||||||||||||||||||||||||||
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Fundamentals | ||||||||||||||||||||||||||
Standards (history)
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Indian Regional Navigation Satellite System (IRNSS), with an operational name ofNavIC (acronym forNavigation with Indian Constellation; also,nāvik 'sailor' or 'navigator' in Indian languages),[2] is an autonomous regionalsatellite navigation system that provides accurate real-time positioning and timing services.[3] It covers India and a region extending 1,500 km (930 mi) around it, with plans for further extension up to 3,000 km (1,900 mi).[4] An extended service area lies between the primary service area and a rectangle area enclosed by the30th parallel south to the50th parallel north and the30th meridian east to the130th meridian east, 1,500–6,000 km (930–3,730 mi) beyond borders where some of the NavIC satellites are visible but the position is not always computable with assured accuracy.[5] The system currently consists of a constellation of eight[6] satellites,[7][8] with two additional satellites on ground as stand-by.[9]
The constellation is in orbit as of 2018.[10][11][12][13] NavIC will provide two levels of service, the "standard positioning service", which will be open for civilian use, and a "restricted service" (anencrypted one) for authorised users (including the military).
NavIC-based trackers are compulsory on commercial vehicles in India,[14][15] and some consumermobile phones with support for it have been available since the first half of 2020.[16][17][18][19][20]
There are plans to expand the NavIC system by increasing its constellation size from 7 to 11.[21]
The system was developed partly because access to foreign government-controlledglobal navigation satellite systems is not guaranteed in hostile situations, as happened to the Indian military in 1999 when the United States denied an Indian request forGlobal Positioning System (GPS) data for theKargil region, which would have provided vital information.[22] The Indian government approved the project in May 2006.[23][24]
As part of the project, theIndian Space Research Organisation (ISRO) opened a new satellite navigation centre within the campus of ISRODeep Space Network (DSN) atByalalu,Karnataka on 28 May 2013.[25] A network of 21 ranging stations located across the country will provide data for theorbital determination of the satellites and monitoring of the navigation signal.
A goal of complete Indian control has been stated, with the space segment,ground segment and user receivers all being built in India. Its location in lowlatitudes facilitates coverage with low-inclination satellites. Three satellites will be ingeostationary orbit over theIndian Ocean. Missile targeting could be an important military application for the constellation.[26]
The total cost of the project was expected to be₹14.2 billion (US$168 million), with the cost of the ground segment being₹3 billion (US$35 million), each satellite costing₹1.5 billion (US$18 million) and the PSLV-XL version rocket costing around₹1.3 billion (US$15 million). The planned seven rockets would have involved an outlay of around₹9.1 billion (US$108 million).[9][27][28]
The necessity for two replacement satellites, and PSLV-XL launches, has altered the original budget, with the Comptroller and Auditor General of India reporting costs (as of March 2017) of₹22.46 billion (US$266 million).[1]
India'sDepartment of Space in their 12th Five Year Plan (FYP) (2012–17) stated increasing the number of satellites in the constellation from 7 to 11 to extend coverage.[29] These additional four satellites will be made during 12th FYP and will be launched in the beginning of 13th FYP (2018–23) ingeosynchronous orbit of 42° inclination.[30][31] Also, the development of space-qualified Indian made atomic clocks was initiated,[32] along with a study and development initiative for an alloptical atomic clock (ultra stable for IRNSS anddeep space communication).[33][29]
The NavIC Signal in Space ICD was released for evaluation in September 2014.[34]
From 1 April 2019, use ofAIS 140 compliant NavIC-based vehicle tracking systems were made compulsory for allcommercial vehicles in India.[14][15]
In December 2019, theUnited States Congress consented to designate NaVIC as one of their allied navigational satellite systems along withGalileo (Europe) andQZSS (Japan). The approval was as a part ofNational Defense Authorization Act 2020. The proposal was put forward byUnited States Secretary of Defense in consultation withDirector of National Intelligence.[35][36]
In 2017, it was announced that all three SpectraTime suppliedrubidiumatomic clocks on boardIRNSS-1A had failed, mirroring similar failures in the European Union's Galileo constellation.[37][38] The first failure occurred in July 2016, followed soon after by the two other clocks on IRNSS-1A. This rendered the satellite non-functional and required replacement.[39] ISRO reported it had replaced the atomic clocks in the two standby satellites, IRNSS-1H and IRNSS-1I in June 2017.[21] The subsequent launch of IRNSS-1H, as a replacement for IRNSS-1A, was unsuccessful when PSLV-C39 mission failed on 31 August 2017.[21][40] The second standby satellite, IRNSS-1I, was successfully placed into orbit on 12 April 2018.[41]
In July 2017, it was reported that two more clocks in the navigational system had also started showing signs of abnormality, thereby taking the total number of failed clocks to five,[21] in May 2018 a failure of a further 4 clocks was reported, taking the count to 9 of the 24 in orbit.[42]
As a precaution to extend the operational life of navigation satellite, ISRO is running only one rubidium atomic clock instead of two in the remaining satellites.[21]
As of May 2023[update] only four first generation satellites were capable of providingnavigation services[43] which is the minimum number required for service to remain operational.[44]
As of September 2024[update] only four satellites IRNSS-1B, IRNSS-1F, IRNSS-1I and NVS-01 were capable of providingnavigation services.[45][46]
In July 2025, while responding to a query throughRight to Information Act, the ISRO revealed that only five IRNSS satellites are completely defunct, having all of their three clocks failed. Meanwhile, one satellite has only one functional clock and only two satellites are fully functional.[47]
In order to reduce the dependency on imported frequency standards ISRO'sSpace Applications Centre (SAC), Ahmedabad had been working on domestically designed and developedRubidium based atomic clocks.[3][33][32][29] To overcome the clock failures on first generation navigation satellites and its subsequent impact on NavIC'sposition, navigation, and timing services, these new clocks would supplement the imported atomic clocks in next generation of navigation satellites.[48][49][50][51]
On 5 July 2017, ISRO andIsrael Space Agency (ISA) signed anMemorandum of Understanding to collaborate on space qualifying aRubidium Standard based on AccuBeat model AR133A and to test it on an ISRO satellite.[6]
The clocks are utilised by the NVS series of satellites.[24] As part of theTimes Dissemination Project, which is overseen by theMinistry of Consumer Affairs, Food, and Public Distribution, NavIC will take the position of GPS as the reference time provider at theNational Physical Laboratory of India from 2025.[52]
In accordance with the range requirements for NavIC for both military and commercial applications,Defence Research and Development Organisation, through the Technology Development Fund scheme, has commissioned Accord Software and Systems, to build a tailored and flexible IRNSS Network Timing system domestically. Using NavIC data, the receiver chip will obtain and distribute Indian time for navigation. India currently depends on the US for this service.[53]
In 2020,Qualcomm launched four Snapdragon4G chipsets and one5G chipset with support for NavIC.[54][55] NavIC is planned to be available for civilian use in mobile devices, after Qualcomm and ISRO signed an agreement.[16][56] To increase compatibility with existing hardware, ISRO will add L1 band support. For strategic application, Long Code support is also coming.[57][58]
On December 7, 2023, Qualcomm revealed that select chipset platforms will enable NavIC L1 signals. The Qualcomm location suite, supports up to seven satellite constellations simultaneously and allows for fasterTime to First Fix (TTFF) position acquisition for enhancedlocation-based services. It also makes use of all of NavIC's L1 and L5 signals for precise positioning. In the second half of 2024, Qualcomm chipset platforms will add further support for the NavIC L1 signals, and in the first half of 2025, commercial products that support the NavIC L1 signals should be available for sale.[59][60]
In April 2010, it was reported that India plans to start launching satellites by the end of 2011, at a rate of one satellite every six months. This would have made NavIC functional by 2015. But the program was delayed,[61] and India also launched 3 new satellites to supplement this.[62]
Seven satellites with the prefix "IRNSS-1" will constitute the space segment of the IRNSS.IRNSS-1A, the first of the seven satellites, was launched on 1 July 2013.[63][64]IRNSS-1B was launched on 4 April 2014 on-board PSLV-C24 rocket. The satellite has been placed ingeosynchronous orbit.[65]IRNSS-1C was launched on 16 October 2014,[66]IRNSS-1D on 28 March 2015,[67]IRNSS-1E on 20 January 2016,[68]IRNSS-1F on 10 March 2016 andIRNSS-1G was launched on 28 April 2016.[69]
The eighth satellite,IRNSS-1H, which was meant to replace IRNSS-1A, failed to deploy on 31 August 2017 as theheat shields failed to separate from the 4th stage of the rocket.[70]IRNSS-1I was launched on 12 April 2018 to replace it.[71][72]
The IRNSS system comprises a space segment and a supportground segment.
The constellation consists of 7 satellites. Three of the seven satellites are located ingeostationary orbit (GEO) atlongitudes 32.5° E, 83° E, and 131.5° E, approximately 36,000 km (22,000 mi) above Earth's surface. The remaining four satellites are in inclinedgeosynchronous orbit (GSO). Two of them cross theequator at 55° E and two at 111.75° E.[73][74][75]
The ground segment is responsible for the maintenance and operation of the IRNSS constellation. The ground segment comprises:[73]
The IRSCF is operational at Master Control Facility (MCF), Hassan and Bhopal. The MCF uplinks navigation data and is used for tracking, telemetry and command functions.[76] Seven 7.2-metre (24 ft) FCA and two 11-metre (36 ft) FMA of IRSCF are currently operational forLEOP and on-orbit phases of IRNSS satellites.[73][77]
The INC established atByalalu performs remote operations and data collection with all the ground stations. The ISRO Navigation Centers (INC) are operational at Byalalu,Bengaluru andLucknow. INC1 (Byalalu) and INC2 (Lucknow) together provide seamless operations with redundancy.[78]
16 IRIMS are currently operational and are supporting IRNSS operations.[79] A few more are planned in Brunei, Indonesia, Australia, Russia, France and Japan.[80]CDMA ranging is being carried out by the four IRCDR stations on a regular basis for all the IRNSS satellites. The IRNWT has been established and is providing IRNSS system time with an accuracy of 2 ns (2.0×10−9 s) (2 sigma) with respect toUTC. Laser ranging is being carried out with the support ofILRS stations around the world. Navigation software is operational at INC since 1 Aug 2013. All the navigation parameters, such as satelliteephemeris, clock corrections, integrity parameters, and secondary parameters, such as iono-delay corrections, time offsets with respect to UTC and otherGNSSes,almanac, text message, and earth orientation parameters, are generated and uploaded to the spacecraft automatically. The IRDCN has established terrestrial andVSAT links between the ground stations. As of March 2021, ISRO andJAXA are performing calibration and validation experiments for NavIC ground reference station in Japan.[81] ISRO is also under discussion withCNES for a NavIC ground reference station in France.[82] ISRO is planning a NavIC ground station atCocos (Keeling) Islands and is in talks with theAustralian Space Agency.[83]
NavIC signals will consist of a Standard Positioning Service and a Restricted Service. Both will be carried on L5 (1176.45 MHz) and S band (2492.028 MHz).[84] The SPS signal will be modulated by a 1 MHzBPSK signal. The Restricted Service will useBOC(5,2). The navigation signals themselves would be transmitted in the L5 (1176.45 MHz) & S band (2492.028 MHz) frequencies and broadcast through a phased array antenna to maintain required coverage and signal strength. The satellites would weigh approximately 1,330 kg (2,930 lb) and their solar panels generate 1,400 W.
A messaging interface is embedded in the NavIC system. This feature allows the command center to send warnings to a specific geographic area. For example, fishermen using the system can be warned about a cyclone.[85]
The Standard Positioning Service system is intended to provide an absolute position accuracy of about 5 to 10 metres throughout theIndian landmass and an accuracy of about 20 metres (66 ft) in the Indian Ocean as well as a region extending approximately 1,500 km (930 mi) around India.[86][87] GPS, for comparison, has a position accuracy of 5 m under ideal conditions.[88] However, unlike GPS, which is dependent only on L-band, NavIC has dual frequencies (S and L bands). When a low-frequency signal travels through atmosphere, its velocity changes due to atmospheric disturbances. GPS depends on an atmospheric model to assess frequency error, and it has to update this model from time to time to assess the exact error. In NavIC, the actual delay is assessed by measuring the difference in delay of the two frequencies (S and L bands). Therefore, NavIC is not dependent on any model to find the frequency error and can be more accurate than GPS.[89]
ISRO will be launching five next generation satellite featuring new payloads and extended lifespan of 12 years. Five new satellites viz. NVS-01, NVS-02, NVS-03, NVS-04 and NVS-05 will supplement and augment the current constellation of satellites. The new satellites will feature the L5 and S band and introduces a new interoperable civil signal in theL1 band in the navigation payload and will use IndianRubidium Atomic Frequency Standard (iRAFS.)[51][90][91][92] This introduction of the new L1 band will help facilitate NavIC proliferation inwearable smart andIoT devices featuring a low power navigation system.NVS-01 is a replacement forIRNSS-1G satellite and was launched onGSLV in 2023.[93][76][94]
ISRO has plans for a total of 7 NVS series satellites (including already launched NVS-1) for civilian navigation requirements. The IRNSS network is, as of November 2024, confined to strategic use by theIndian Armed Forces. They will be equipped with L1 band along with the L5 and S band. The system will provide an accuracy of 10 m (33 ft) within India, 20 m (66 ft) for the area surrounding India by 1,500 km (930 mi).[95][96]
Approved project cost of first five NVS satellites (NVS-01 to NVS-05) is₹964.68 crore (equivalent to₹10 billion or US$120 million in 2023) excluding the launch costs.[97]
As reported in August 2025, ISRO plans to launch at least three satellites by the end of 2026. However, the development of indigenous atomic clocks is an "element impeding the launch". The development is also being delayed since multiple components are needed to be imported which leads to procurement challenges. Following the multiple instances of atomic clock failures, five atomic clocks per satellite has been proposed for future units.[47]
Study and analysis for the Global Indian Navigation System (GINS) was initiated as part of the technology and policy initiatives in the 12th FYP (2012–17).[33] The system is supposed to have a constellation of 24 satellites, positioned 24,000 km (14,913 mi) above Earth. As of 2013[update], thestatutory filing forfrequency spectrum of GINS satellite orbits in international space, has been completed.[98] As per new 2021 draft policy,[99] ISRO andDepartment of Space (DoS) is working on expanding the coverage of NavIC from regional to global that will be independent of other such system currently operational namelyGPS,GLONASS,BeiDou andGalileo while remaining interoperable and free for global public use.[100] ISRO has proposed to Government of India to expand the constellation for global coverage by initially placing twelve satellites inMedium Earth Orbit (MEO).[57]
The constellation consists of 7 active satellites. Three of the seven satellites in constellation are located ingeostationary orbit (GEO) and four are in inclinedgeosynchronous orbit (IGSO). All satellites launched or proposed for the system are as follows:
| Satellite | SVN | PRN | Int. Sat. ID | NORAD ID | Launch Date | Launch Vehicle | Orbit | Status | Remarks |
|---|---|---|---|---|---|---|---|---|---|
| IRNSS-1A | I001 | I01 | 2013-034A | 39199 | 1 July 2013 | PSLV-XL-C22 | Geosynchronous (IGSO) / 55°E, 29° inclined orbit | Partial Failure | Atomic clocks failed. The satellite is being used for NavIC's short message broadcast service.[78][102][103] |
| IRNSS-1B | I002 | I02 | 2014-017A | 39635 | 4 April 2014 | PSLV-XL-C24 | Geosynchronous (IGSO) / 55°E, 29° inclined orbit | Operational | [104] |
| IRNSS-1C | I003 | I03 | 2014-061A | 40269 | 16 October 2014 | PSLV-XL-C26 | Geostationary (GEO) / 83°E, 5° inclined orbit | Partial Failure | [46] |
| IRNSS-1D | I004 | I04 | 2015-018A | 40547 | 28 March 2015 | PSLV-XL-C27 | Geosynchronous (IGSO) / 111.75°E, 31° inclined orbit | Partial Failure | [105][106][107] |
| IRNSS-1E | I005 | I05 | 2016-003A | 41241 | 20 January 2016 | PSLV-XL-C31 | Geosynchronous (IGSO) / 111.75°E, 29° inclined orbit | Partial Failure | The satellite is being used for NavIC's short message broadcast service.[108][109][107] |
| IRNSS-1F | I006 | I06 | 2016-015A | 41384 | 10 March 2016 | PSLV-XL-C32 | Geostationary (GEO) / 32.5°E, 5° inclined orbit | Operational | [110] |
| IRNSS-1G | I007 | I07 | 2016-027A | 41469 | 28 April 2016 | PSLV-XL-C33 | Geostationary (GEO) / 129.5°E, 5.1° inclined orbit | Partial Failure | Replaced by NVS-01. Currently being used for NavIC's short message broadcast service.[76][109][107] |
| IRNSS-1H | I008 | I08 | 31 August 2017 | PSLV-XL-C39 | Geosynchronous (IGSO) / 55°E, 29° inclined orbit | Launch Failed | Thepayload fairing failed to separate and satellite could not reach the desired orbit.[70][111] It was meant to replace defunct IRNSS-1A.[102][21] | ||
| IRNSS-1I | I009 | I09 | 2018-035A | 43286 | 12 April 2018 | PSLV-XL-C41 | Geosynchronous (IGSO) / 55°E, 29° inclined orbit | Operational | [41] |
| Satellite | SVN | PRN | Int. Sat. ID | NORAD ID | Launch Date | Launch Vehicle | Orbit | Status | Remarks |
|---|---|---|---|---|---|---|---|---|---|
| NVS-01 (IRNSS-1J) | I010 | I10 | 2023-076A | 56759 | 29 May 2023[112][113] | GSLV Mk II -F12[114] | Geostationary (GEO) / 129.5°E, 5.1° inclined orbit | Operational | ReplacedIRNSS-1G. Features extended lifespan, indigenous clock and new civilian band L1 for low power devices.[76][91][115] |
| NVS-02 (IRNSS-1K) | 29 January 2025[116] | GSLV Mk II -F15 | Partial Failure | Intended replacement of malfunctioningIRNSS-1E satellite.[117][118][119] However, NVS-02 suffered from a propulsion system failure and the ISRO is looking for alternative uses for the satellite.[120][121] | |||||
| NVS-03 (IRNSS-1L) | January 2026 | GSLV Mk II-F17 | Geosynchronous (IGSO), 32.5°E or 129.5°E, 29° inclined orbit | Planned | [122][123] | ||||
| NVS-04 (IRNSS-IM) | July 2026 | GSLV Mk II | Geosynchronous (IGSO), 32.5°E or 129.5°E, 29° inclined orbit | Planned | [76][118][119] | ||||
| NVS-05 (IRNSS-1N) | Q4 2026 | GSLV Mk II | Geosynchronous (IGSO), 32.5°E or 129.5°E, 29° inclined orbit | Planned | [76][118][119] | ||||
| NVS-06 | TBD | GSLV Mk II | Geosynchronous (IGSO), 32.5°E or 129.5°E, 29° inclined orbit | Planned | [76][118][119] | ||||
| NVS-07 | TBD | GSLV Mk II | Geosynchronous (IGSO), | Planned | [76][118][119] |
The project to establish the IRNSS at a cost of Rs. 1,420 crores was approved by the Union Government in June 2006.
Currently, only four IRNSS satellites are able to provide location services, according to ISRO officials. The other satellites can only be used for messaging services such as providing disaster warnings or potential fishing zone messages for fishermen.
For determining position and time, a minimum of four satellites are required.
Currently, there are four functional satellites providing PNT service.
Four satellites providing PNT service (IRNSS-1B, 1F, 1I, and NVS-01).
IRNSS-1A and IRNSS-1G are currently being used for short messaging services.
ISTRAC has established a network of stations to support IRNSS satellites consisting of four IRCDR stations (Hassan, Bhopal, Jodhpur and Shillong), 16 IRIMS stations (Bengaluru, Hassan, Bhopal, Jodhpur, Shillong, Dehradun, Port Blair, Mahendragiri, Lucknow, Kolkata, Udaipur, Shadnagar, Pune and Mauritius). ISTRAC has also established ISRO Navigation Centre-1, including an IRNWT facility at Bengaluru and ISRO Navigation Centre-2, including an IRNWT facility at Lucknow.
Brunei, Indonesia, Australia, Russia, France, Japan (IRIMS)
With the inclusion of NVS-01, the NavIC base layer now consists of five satellites (IRNSS-1B, 1C, 1F, 1I and NVS-01) for operational service.
NavIC is offering short messaging service for users in Indian region through IRNSS-1A and 1E satellites.
IRNSS 1G is not available for performance evaluation since October 05, 2019. IRNSS 1E is not available for performance evaluation since August 04, 2021
It will be placed at 111.75ºE replacing IRNSS-1E
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