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Navigation with Indian Constellation (NavIC)

Logo of NavIC
Country/ies of origin	India
Operator(s)	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	5
Current usable satellites	List IRNSS- 1B/1C/1D/1F/1I (Operational) 1A/1E/1G (Clock failure, short-message services only) NVS- 01 (Operational)
First launch	1 July 2013; 11 years ago (1 July 2013)
Last launch	29 May 2023
Total launches	10
Orbital characteristics
Regime(s)	geostationary orbit (GEO), inclined geosynchronous orbit (IGSO)
Orbital height	35,786 km (22,236 mi)
Other details
Cost	₹2,246 crore (US$269 million) as of March 2017

Geodesy
Fundamentals Geodesy Geodynamics Geomatics History
Concepts Geographical distance Geoid Figure of the Earth (radius and circumference) Geodetic coordinates Geodetic datum Geodesic Horizontal position representation Latitude / Longitude Map projection Reference ellipsoid Satellite geodesy Spatial reference system Spatial relations Vertical positions
Technologies Global Nav. Sat. Systems (GNSSs) Global Pos. System (GPS) GLONASS (Russia) BeiDou (BDS) (China) Galileo (Europe) NAVIC (India) Quasi-Zenith Sat. Sys. (QZSS) (Japan) Discrete Global Grid and Geocoding
Standards (history) NGVD 29 Sea Level Datum 1929 OSGB36 Ordnance Survey Great Britain 1936 SK-42 Systema Koordinat 1942 goda ED50 European Datum 1950 SAD69 South American Datum 1969 GRS 80 Geodetic Reference System 1980 ISO 6709 Geographic point coord. 1983 NAD 83 North American Datum 1983 WGS 84 World Geodetic System 1984 NAVD 88 N. American Vertical Datum 1988 ETRS89 European Terrestrial Ref. Sys. 1989 GCJ-02 Chinese obfuscated datum 2002 Geo URI Internet link to a point 2010 International Terrestrial Reference System Spatial Reference System Identifier (SRID) Universal Transverse Mercator (UTM)
v t e

The Indian Regional Navigation Satellite System (IRNSS), with an operational name of NavIC (acronym for Navigation with Indian Constellation; also, nāvik 'sailor' or 'navigator' in Indian languages), is an autonomous regional satellite navigation system that provides accurate real-time positioning and timing services. 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). 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 (930–3,730 mi) beyond borders where some of the NavIC satellites are visible but the position is not always computable with assured accuracy. The system currently consists of a constellation of eight satellites, with two additional satellites on ground as stand-by.

The constellation is in orbit as of 2018. NavIC will provide two levels of service, the "standard positioning service", which will be open for civilian use, and a "restricted service" (an encrypted one) for authorised users (including the military).

NavIC-based trackers are compulsory on commercial vehicles in India and some consumer mobile phones with support for it have been available since the first half of 2020.

There are plans to expand the NavIC system by increasing its constellation size from 7 to 11.

Background

The system was developed partly because access to foreign government-controlled global 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 for Global Positioning System (GPS) data for the Kargil region, which would have provided vital information. The Indian government approved the project in May 2006.

Development

First Generation

As part of the project, the Indian Space Research Organisation (ISRO) opened a new satellite navigation centre within the campus of ISRO Deep Space Network (DSN) at Byalalu, in Karnataka on 28 May 2013. A network of 21 ranging stations located across the country will provide data for the orbital 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 low latitudes facilitates coverage with low-inclination satellites. Three satellites will be in geostationary orbit over the Indian Ocean. Missile targeting could be an important military application for the constellation.

The total cost of the project was expected to be ₹14.2 billion (US$170 million), with the cost of the ground segment being ₹3 billion (US$36 million), each satellite costing ₹1.5 billion (US$18 million) and the PSLV-XL version rocket costing around ₹1.3 billion (US$16 million). The planned seven rockets would have involved an outlay of around ₹9.1 billion (US$109 million).

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$269 million).

India's Department 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. These additional four satellites will be made during 12th FYP and will be launched in the beginning of 13th FYP (2018–23) in geosynchronous orbit of 42° inclination. Also, the development of space-qualified Indian made atomic clocks was initiated, along with a study and development initiative for an all optical atomic clock (ultra stable for IRNSS and deep space communication).

The NavIC Signal in Space ICD was released for evaluation in September 2014.

From 1 April 2019, use of AIS 140 compliant NavIC-based vehicle tracking systems were made compulsory for all commercial vehicles in India.

In December 2019, the United States Congress consented to designate NaVIC as one of their allied navigational satellite systems along with Galileo (Europe) and QZSS (Japan). The approval was as a part of National Defense Authorization Act 2020. The proposal was put forward by United States Secretary of Defense in consultation with Director of National Intelligence.

Clock failure

The IRNSS series of satellite utilises rubidium atomic clocks sourced from Israel.

In 2017, it was announced that all three SpectraTime supplied rubidium atomic clocks on board IRNSS-1A had failed, mirroring similar failures in the European Union's Galileo constellation. 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. ISRO reported it had replaced the atomic clocks in the two standby satellites, IRNSS-1H and IRNSS-1I in June 2017. The subsequent launch of IRNSS-1H, as a replacement for IRNSS-1A, was unsuccessful when PSLV-C39 mission failed on 31 August 2017. The second standby satellite, IRNSS-1I, was successfully placed into orbit on 12 April 2018.

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, in May 2018 a failure of a further 4 clocks was reported, taking the count to 9 of the 24 in orbit.

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.

As of May 2023 only four satellites are capable of providing navigation services which is the minimum number required for service to remain operational.

Indian Atomic clock

In order to reduce the dependency on imported frequency standards ISRO's Space Applications Centre (SAC), Ahmedabad had been working on domestically designed and developed Rubidium based atomic clocks. To overcome the clock failures on first generation navigation satellites and its subsequent impact on NavIC's position, navigation, and timing services, these new clocks would supplement the imported atomic clocks in next generation of navigation satellites.

On 5 July 2017, ISRO and Israel Space Agency (ISA) signed an Memorandum of Understanding to collaborate on space qualifying a Rubidium Standard based on AccuBeat model AR133A and to test it on an ISRO satellite.

The clocks are utilised by the NVS series of satellites.

NaVIC chip

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.

In 2020, Qualcomm launched four Snapdragon 4G chipsets and one 5G chipset with support for NavIC. NavIC is planned to be available for civilian use in mobile devices, after Qualcomm and ISRO signed an agreement. To increase compatibility with existing hardware, ISRO will add L1 band support. For strategic application, Long Code support is also coming.

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 faster Time to First Fix (TTFF) position acquisition for enhanced location-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.

Time-frame

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, and India also launched 3 new satellites to supplement this.

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. IRNSS-1B was launched on 4 April 2014 on-board PSLV-C24 rocket. The satellite has been placed in geosynchronous orbit. IRNSS-1C was launched on 16 October 2014, IRNSS-1D on 28 March 2015, IRNSS-1E on 20 January 2016, IRNSS-1F on 10 March 2016 and IRNSS-1G was launched on 28 April 2016.

The eighth satellite, IRNSS-1H, which was meant to replace IRNSS-1A, failed to deploy on 31 August 2017 as the heat shields failed to separate from the 4th stage of the rocket. IRNSS-1I was launched on 12 April 2018 to replace it.

System description

The IRNSS system comprises a space segment and a support ground segment.

Space segment

The constellation consists of 7 satellites. Three of the seven satellites are located in geostationary orbit (GEO) at longitudes 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 inclined geosynchronous orbit (GSO). Two of them cross the equator at 55° E and two at 111.75° E.

Ground segment

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

• 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)

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. Seven 7.2-metre (24 ft) FCA and two 11-metre (36 ft) FMA of IRSCF are currently operational for LEOP and on-orbit phases of IRNSS satellites.

The INC established at Byalalu performs 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.

16 IRIMS are currently operational and are supporting IRNSS operations few more are planned in Brunei, Indonesia, Australia, Russia, France and Japan. CDMA ranging 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 2 ns (2.0×10 s) (2 sigma) with respect to UTC. Laser ranging is being carried out with the support of ILRS stations around the world. Navigation software is operational at INC since 1 Aug 2013. All the navigation parameters, such as satellite ephemeris, clock corrections, integrity parameters, and secondary parameters, such as iono-delay corrections, time offsets with respect to UTC and other GNSSes, almanac, text message, and earth orientation parameters, are generated and uploaded to the spacecraft automatically. The IRDCN has established terrestrial and VSAT links between the ground stations. As of March 2021, ISRO and JAXA are performing calibration and validation experiments for NavIC ground reference station in Japan. ISRO is also under discussion with CNES for a NavIC ground reference station in France. ISRO is planning a NavIC ground station at Cocos (Keeling) Islands and is in talks with the Australian Space Agency.

Signal

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). The SPS signal will be modulated by a 1 MHz BPSK signal. The Restricted Service will use BOC(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.

Accuracy

The Standard Positioning Service system is intended to provide an absolute position accuracy of about 5 to 10 metres throughout the Indian 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. GPS, for comparison, has a position accuracy of 5 m under ideal conditions. 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.

Future developments

NVS series

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 the L1 band in the navigation payload and will use Indian Rubidium Atomic Frequency Standard (iRAFS.) This introduction of the new L1 band will help facilitate NavIC proliferation in wearable smart and IoT devices featuring a low power navigation system. NVS-01 is a replacement for IRNSS-1G satellite and was launched on GSLV in 2023.

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 the Indian 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).

Global Indian Navigation System

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). The system is supposed to have a constellation of 24 satellites, positioned 24,000 km (14,913 mi) above Earth. As of 2013, the statutory filing for frequency spectrum of GINS satellite orbits in international space, has been completed. As per new 2021 draft policy, ISRO and Department 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 namely GPS, GLONASS, BeiDou and Galileo while remain interoperable and free for global public use. ISRO has proposed to Government of India to expand the constellation for global coverage by initially placing twelve satellites in Medium Earth Orbit (MEO).

List of satellites

The constellation consists of 7 active satellites. Three of the seven satellites in constellation are located in geostationary orbit (GEO) and four are in inclined geosynchronous orbit (IGSO). All satellites launched or proposed for the system are as follows:

IRNSS series satellites

NVS series satellite

See also

• Bhuvan
• Indian Space Research Organisation
• GPS-aided GEO augmented navigation (GAGAN)
• Quasi-Zenith Satellite System (QZSS)

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Footnotes

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

External links

• IRNNS programme Archived 2 March 2022 at the Wayback Machine
• Official Website
• IRNSS Programme at ISRO

v t e Navigation with Indian Constellation (NavIC)
Satellites	IRNSS-1A (Jul 2013) IRNSS-1B (Apr 2014) IRNSS-1C (Oct 2014) IRNSS-1D (Mar 2015) IRNSS-1E (Jan 2016) IRNSS-1F (Mar 2016) IRNSS-1G (Apr 2016) IRNSS-1H (Aug 2017, launch failure) IRNSS-1I (Apr 2018) NVS-01 (2021-21) NVS-02 (Planned) NVS-03 (Planned) NVS-04 (Planned) NVS-05 (Planned)
Related articles	Indian Space Research Organisation Polar Satellite Launch Vehicle Geosynchronous Satellite Launch Vehicle

v t e Indian space programme
Department of Space (DoS)
Organisations	Indian Space Research Organisation (ISRO) Antrix Corporation Indian Institute of Space Science and Technology (IIST) Indian Institute of Remote Sensing (IIRS) National Atmospheric Research Laboratory (NARL) NewSpace India Limited (NSIL) Physical Research Laboratory (PRL) Development and Educational Communication Unit (DECU) Integrated Space Cell Defence Space Agency Indian National Space Promotion and Authorisation Centre (IN–SPACe)
Programmes	Bhaskara GAGAN GSAT INSAT IRNSS IRS Cartosat RISAT Rohini SROSS Chandrayaan Human Spaceflight Programme
Satellites	APPLE Aryabhata HAMSAT IMS-1 Megha-Tropiques NISAR SARAL South Asia Satellite Kalpana-1
Space observatories	Astrosat Aditya-L1 XPoSat AstroSat-2 (proposed)
Lunar and planetary spacecraft	Chandrayaan-1 Moon Impact Probe Chandrayaan-2 Vikram lander Pragyan rover Chandrayaan-3 Vikram lander Pragyan rover Chandrayaan-4 (upcoming) Lunar Polar Exploration Mission (proposed) Mars Orbiter Mission Mars Orbiter Mission 2 (proposed) Venus Orbiter Mission (proposed)
Human spaceflight	Indian human spaceflight programme SRE-1 SRE-II Gaganyaan CARE ISRO Space Station (proposed)
Launch vehicles	Active Orbital PSLV Launches GSLV Launches LVM3 SSLV Launches Suborbital Rohini ATV In development RLV Technology Demonstration Programme NGLV Retired SLV ASLV
Engines	Active CE-7.5 CE-20 Vikas In development SCE-200
Spaceports	Satish Dhawan Space Centre Thumba Equatorial Rocket Launching Station under development Kulasekharapatnam Spaceport
Research facilities	Vikram Sarabhai Space Centre U R Rao Satellite Centre Liquid Propulsion Systems Centre ISRO Propulsion Complex Space Applications Centre ISRO Inertial Systems Unit Laboratory for Electro-Optics Systems Human Space Flight Centre Development and Educational Communication Unit
Communications	Indian Deep Space Network Indian Space Science Data Centre ISRO Telemetry, Tracking and Command Network Master Control Facility National Remote Sensing Centre
Legislation and policy	Space Activities Bill
Private companies	Pixxel Skyroot Aerospace Satellize AgniKul Cosmos Dhruva Space Bellatrix Aerospace TeamIndus
Related	National Space Day SAGA-220 (supercomputer) Statio Shiv Shakti RESPOND
List of Indian satellites List of Satish Dhawan Space Centre launches List of ISRO missions List of ISRO chairpersons

v t e Indian spacecraft
List of Indian satellites List of Satish Dhawan Space Centre launches List of ISRO missions
Satellites	Communication CMS 01 02 GSAT 1 2 3 (EDUSAT) 4 5P 6 6A 7 7A 8 9 (South Asia Satellite) 10 11 12 14 15 16 17 18 19 29 30 31 HAMSAT INSAT 1A 1B 1C 1D 2A 2B 2C 2D 2DT 2E 3A 3B 3C 3D 3DR 3DS 3E 4A 4B 4C 4CR 4E 4F 4G Planned: GSAT 20 22 23 24 Earth observation Bhaskara I II Cartosat 1 2 2A 2B 2C 2D 2E 2F 3 EMISAT EOS 1 2 4 7 8 HySIS IMS-1 IRS 1A 1B 1C 1D 1E P1 P2 P3 Megha-Tropiques Microsat Microsat-R Oceansat 1 2 Resourcesat 1 2 RISAT 1 2 2B 2BR1 Rohini RS-D1 RS-D2 SARAL SCATSAT-1 Technology Experiment Satellite (TESS) Planned: NISAR GISAT Oceansat-3 Resourcesat-3 RISAT-1A Experimental APPLE Aryabhata Rohini RS-1 Rohini Technology Payload (RTP) Navigation IRNSS 1A 1B 1C 1D 1E 1F 1G 1I NVS-01 Student satellites ANUSAT Jugnu SRMSAT StudSat StudSat-2 YouthSat Pratham
Space probes	Scientific SROSS A B C C2 Astronomical Astrosat Aditya-L1 XPoSat AstroSat-2 (planned) Lunar programme Chandrayaan-1 Moon Impact Probe Chandrayaan-2 Vikram Pragyan Chandrayaan-3 Vikram Pragyan Lunar Polar Exploration Mission Chandrayaan-4 Chandrayaan-5 Chandrayaan-6 Interplanetary Mars Orbiter Mission Mars Orbiter Mission 2 (planned) Venus Orbiter Mission (planned)
Human spaceflight	Indian Human Spaceflight Programme SRE-1 SRE-II SRE-III Gaganyaan CARE Bharatiya Antariksha Station
Future spacecraft in italics.

• Spaceflight
• Geography
• India

• Indian Regional Navigation Satellite System
• ISRO programs
• Navigation satellite constellations
• 2013 establishments in India