Indian Regional Navigation Satellite System

(Redirected fromNavIC)

TheIndian 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 navigationsystem that provides accurate real-time positioning and timing services.[3]It coversIndiaand 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 southto the50th parallel northand the30th meridian eastto 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]

Navigation with Indian Constellation (NavIC)
Logo of NavIC
Country/ies of originIndia
Operator(s)ISRO
TypeMilitary, Commercial
StatusOperational
CoverageRegional (up to 1,500 km or 930 mi from borders)
Accuracy3 m or 9.8 ft (public)
2 m or 6 ft 7 in (encrypted)
Constellation size
Nominalsatellites5
Current usablesatellites
List
  • IRNSS-

    1B/1C/1D/1F/1I(Operational)

    1A/1E/1G(Clock failure, short-message services only)

  • NVS-

    01(Operational)

First launch1 July 2013;11 years ago(1 July 2013)
Last launch29 May 2023
Total launches10
Orbital characteristics
Regime(s)geostationary orbit(GEO),inclined geosynchronous orbit(IGSO)
Orbital height35,786 km (22,236 mi)
Other details
Cost2,246crore(US$269 million) as of March 2017[1]

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" (anencryptedone) for authorised users (including the military).

NavIC-based trackers are compulsory on commercial vehicles in India[14][15]and some consumermobile phoneswith 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]

Background

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The system was developed partly because access to foreign government-controlledglobal navigation satellite systemsis 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]

Development

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First Generation

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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,inKarnatakaon 28 May 2013.[25]A network of 21 ranging stations located across the country will provide data for theorbital determinationof the satellites and monitoring of the navigation signal.

A goal of complete Indian control has been stated, with the space segment,ground segmentand user receivers all being built in India. Its location in lowlatitudesfacilitates coverage with low-inclinationsatellites. Three satellites will be ingeostationary orbitover theIndian Ocean.Missile targeting could be an important military application for the constellation.[26]

The total cost of the project was expected to be14.2 billion(US$170 million), with the cost of the ground segment being3 billion(US$36 million), each satellite costing1.5 billion(US$18 million) and the PSLV-XL version rocket costing around1.3 billion(US$16 million). The planned seven rockets would have involved an outlay of around9.1 billion(US$109 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) of22.46 billion(US$269 million).[1]

India'sDepartment of Spacein 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 orbitof 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 140compliant NavIC-based vehicle tracking systems were made compulsory for allcommercial vehiclesin India.[14][15]

In December 2019, theUnited States Congressconsented 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 Defensein consultation withDirector of National Intelligence.[35][36]

Clock failure

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The IRNSS series of satellite utilisesrubidiumatomic clockssourced from Israel.[24]

In 2017, it was announced that all three SpectraTime suppliedrubidiumatomic clockson boardIRNSS-1Ahad 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 2023only four satellites are capable of providingnavigationservices[43]which is the minimum number required for service to remain operational.[44]

Indian Atomic clock

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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 timingservices, these new clocks would supplement the imported atomic clocks in next generation of navigation satellites.[45][46][47][48]

On 5 July 2017, ISRO andIsrael Space Agency(ISA) signed anMemorandum of Understandingto collaborate on space qualifying aRubidium Standardbased on AccuBeat model AR133A and to test it on an ISRO satellite.[6]

The clocks are utilised by the NVS series of satellites.[24]

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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.[49]

In 2020,Qualcommlaunched four Snapdragon4Gchipsets and one5Gchipset with support for NavIC.[50][51]NavIC is planned to be available for civilian use in mobile devices, after Qualcomm and ISRO signed an agreement.[16][52]To increase compatibility with existing hardware, ISRO will add L1 band support. For strategic application, Long Code support is also coming.[53][54]

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.[55][56]

Time-frame

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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,[57]and India also launched 3 new satellites to supplement this.[58]

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.[59][60]IRNSS-1Bwas launched on 4 April 2014 on-board PSLV-C24 rocket. The satellite has been placed ingeosynchronous orbit.[61]IRNSS-1Cwas launched on 16 October 2014,[62]IRNSS-1Don 28 March 2015,[63]IRNSS-1Eon 20 January 2016,[64]IRNSS-1Fon 10 March 2016 andIRNSS-1Gwas launched on 28 April 2016.[65]

The eighth satellite,IRNSS-1H,which was meant to replace IRNSS-1A, failed to deploy on 31 August 2017 as theheat shieldsfailed to separate from the 4th stage of the rocket.[66]IRNSS-1Iwas launched on 12 April 2018 to replace it.[67][68]

System description

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The IRNSS system comprises a space segment and a supportground segment.

Space segment

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The constellation consists of 7 satellites. Three of the seven satellites are located ingeostationary orbit(GEO) atlongitudes32.5° 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 theequatorat 55° E and two at 111.75° E.[69][70][71]

Ground segment

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The ground segment is responsible for the maintenance and operation of the IRNSS constellation. The ground segment comprises:[69]

  • IRNSS Spacecraft Control Facility (IRSCF)
  • ISRO Navigation Centre (INC)
  • IRNSS Range and Integrity Monitoring Stations (IRIMS)
  • IRNSS Network Timing Centre (IRNWT)
  • IRNSS CDMA Ranging Stations (IRCDR)
  • Laser Ranging Stations
  • IRNSS Data Communication Network (IRDCN)
Rendering of an IRNSS Series 1 satellite

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.[72]Seven 7.2-metre (24 ft) FCA and two 11-metre (36 ft) FMA of IRSCF are currently operational forLEOPand on-orbit phases of IRNSS satellites.[69][73]

The INC established atByalaluperforms remote operations and data collection with all the ground stations. The ISRO Navigation Centers (INC) are operational at Byalalu, Bengaluru and Lucknow. INC1 (Byalalu) and INC2 (Lucknow) together provide seamless operations with redundancy.[74]

16 IRIMS are currently operational and are supporting IRNSS operations[75]few more are planned in Brunei, Indonesia, Australia, Russia, France and Japan.[76]CDMAranging is being carried out by the four IRCDR stations on regular basis for all the IRNSS satellites. The IRNWT has been established and is providing IRNSS system time with an accuracy of 2ns(2.0×10−9s) (2 sigma) with respect toUTC.Laser ranging is being carried out with the support ofILRSstations 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 andVSATlinks between the ground stations. As of March 2021, ISRO andJAXAare performing calibration and validation experiments for NavIC ground reference station in Japan.[77]ISRO is also under discussion withCNESfor a NavIC ground reference station in France.[78]ISRO is planning a NavIC ground station atCocos (Keeling) Islandsand is in talks with theAustralian Space Agency.[79]

Signal

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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).[80]The SPS signal will be modulated by a 1 MHzBPSKsignal. 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.[81]

Accuracy

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The Standard Positioning Service system is intended to provide an absolute position accuracy of about 5 to 10 metres throughout theIndian landmassand 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.[82][83]GPS, for comparison, has a position accuracy of 5 m under ideal conditions.[84]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.[85]

Future developments

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NVS series

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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 bandin the navigation payload and will use IndianRubidium Atomic Frequency Standard(iRAFS.)[48][86][87][88]This introduction of the new L1 band will help facilitate NavIC proliferation inwearable smartandIoTdevices featuring a low power navigation system.NVS-01is a replacement forIRNSS-1Gsatellite and was launched onGSLVin 2023.[89][72][90]

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).[91][92]

Global Indian Navigation System

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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,thestatutory filingforfrequency spectrumof GINS satellite orbits in international space, has been completed.[93]As per new 2021 draft policy,[94]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,BeiDouandGalileowhile remain interoperable and free for global public use.[95]ISRO has proposed to Government of India to expand the constellation for global coverage by initially placing twelve satellites inMedium Earth Orbit(MEO).[53]

List of satellites

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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:

IRNSS series satellites

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IRNSS-1 series satellites[69][96]
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 clocksfailed. The satellite is being used for NavIC's short message broadcast service.[74][97][98]
IRNSS-1B I002 I02 2014-017A 39635 4 April 2014 PSLV-XL-C24 Geosynchronous (IGSO) / 55°E, 29° inclined orbit Operational
IRNSS-1C I003 I03 2014-061A 40269 16 October 2014 PSLV-XL-C26 Geostationary (GEO) / 83°E, 5° inclined orbit Operational
IRNSS-1D I004 I04 2015-018A 40547 28 March 2015 PSLV-XL-C27 Geosynchronous (IGSO) / 111.75°E, 31° inclined orbit Operational
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.[99][100]
IRNSS-1F I006 I06 2016-015A 41384 10 March 2016 PSLV-XL-C32 Geostationary (GEO) / 32.5°E, 5° inclined orbit Operational
IRNSS-1G I007 I07 2016-027A 41469 28 April 2016 PSLV-XL-C33 Geostationary (GEO) / 129.5°E, 5.1° inclined orbit Partial Failure The satellite is being used for NavIC's short message broadcast service.[72]
IRNSS-1H I008 I08 31 August 2017 PSLV-XL-C39 Geosynchronous (IGSO) / 55°E, 29° inclined orbit Launch Failed Thepayload fairingfailed to separate and satellite could not reach the desired orbit.[66][101]It was meant to replace defunct IRNSS-1A.[97][21]
IRNSS-1I I009 I09 2018-035A 43286 12 April 2018 PSLV-XL-C41 Geosynchronous (IGSO) / 55°E, 29° inclined orbit Operational [41]
Animation of IRNSS
Around the Earth
Around the Earth - Polar view
Earth fixed frame- Equatorial view, front
Earth fixed frame- Equatorial view, side
Earth fixed frame- Polar view
Earth·IRNSS-1B·IRNSS-1C·IRNSS-1E·IRNSS-1F·IRNSS-1G·IRNSS-1I

NVS series satellite

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NVS series satellites[69][96]
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[102][103] GSLV Mk II-F12[104] Geostationary (GEO) / 129.5°E, 5.1° inclined orbit Operational Planned replacement ofIRNSS-1G.Features extended lifespan, indigenous clock and new civilian band L1 for low power devices.[72][87][105]
NVS-02(IRNSS-1K) December 31 2024[106] GSLV Mk II-F15 Geosynchronous (IGSO), 32.5°E or 129.5°E, 29° inclined orbit Planned [72][107][108]
NVS-03(IRNSS-1L) 2025 GSLV Mk II Geosynchronous (IGSO), 32.5°E or 129.5°E, 29° inclined orbit Planned [72][107][108]
NVS-04(IRNSS-IM) 2026 GSLV Mk II Geosynchronous (IGSO), 32.5°E or 129.5°E, 29° inclined orbit Planned [72][107][108]
NVS-05(IRNSS-1N) 2027 GSLV Mk II Geosynchronous (IGSO), 32.5°E or 129.5°E, 29° inclined orbit Planned [72][107][108]
NVS-06(IRNSS-1O) 2028 Planned [91]
NVS-07(IRNSS-1P) 2029 Planned [91]

See also

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References

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Footnotes

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  1. ^SATNAV Industry Meet 2006. ISRO Space India Newsletter. April – September 2006 Issue.
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