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Indian Regional Navigation Satellite System
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<h2 id="background">Background</h2> <p>The system was developed partly because access to foreign government-controlled <a href="/facts/Global_navigation_satellite_system/lVgPlF5v">global navigation satellite systems</a> is not guaranteed in hostile situations, as happened to the Indian military in 1999 when the United States denied an Indian request for <a href="/facts/Global_Positioning_System/DKVLnzF3">Global Positioning System</a> (GPS) data for the <a href="/facts/Kargil_War/64vnlUYF">Kargil region</a>, which would have provided vital information.<a class="footnote-ref" id="fnref:21" href="#fn:21"><sup>21</sup></a> The Indian government approved the project in May 2006.<a class="footnote-ref" id="fnref:22" href="#fn:22"><sup>22</sup></a><a class="footnote-ref" id="fnref:23" href="#fn:23"><sup>23</sup></a> </p> <h2 id="developments">Developments</h2> <h3>First Generation</h3> <p>As part of the project, the <a href="/facts/Indian_Space_Research_Organisation/CdAoFQTL">Indian Space Research Organisation</a> (ISRO) opened a new satellite navigation centre within the campus of ISRO <a href="/facts/Indian_Deep_Space_Network/IggLuu7l">Deep Space Network</a> (DSN) at <a href="/facts/Byalalu/78KHd4fs">Byalalu</a>, in <a href="/facts/Karnataka/NhJAc4t9">Karnataka</a> on 28 May 2013.<a class="footnote-ref" id="fnref:24" href="#fn:24"><sup>24</sup></a> A network of 21 ranging stations located across the country will provide data for the <a href="/facts/Orbit_determination/vgjSfwId">orbital determination</a> of the satellites and monitoring of the navigation signal. </p><p>A goal of complete Indian control has been stated, with the space segment, <a href="/facts/Ground_segment/BpUfqhx9">ground segment</a> and user receivers all being built in India. Its location in low <a href="/facts/Latitude/IBYqkjhU">latitudes</a> facilitates coverage with low-<a href="/facts/Orbital_inclination/TQCFWyfd">inclination</a> satellites. Three satellites will be in <a href="/facts/Geostationary_orbit/VBq1v5Kr">geostationary orbit</a> over the <a href="/facts/Indian_Ocean/Kv0crwKG">Indian Ocean</a>. Missile targeting could be an important military application for the constellation.<a class="footnote-ref" id="fnref:25" href="#fn:25"><sup>25</sup></a> </p><p>The total cost of the project was expected to be <a href="/facts/Indian_rupee/Pxoju0ms">₹</a>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).<a class="footnote-ref" id="fnref:26" href="#fn:26"><sup>26</sup></a><a class="footnote-ref" id="fnref:27" href="#fn:27"><sup>27</sup></a><a class="footnote-ref" id="fnref:28" href="#fn:28"><sup>28</sup></a> </p><p>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).<a class="footnote-ref" id="fnref:29" href="#fn:29"><sup>29</sup></a> </p><p>India's <a href="/facts/Department_of_Space/NeRvPSj4">Department of Space</a> 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.<a class="footnote-ref" id="fnref:30" href="#fn:30"><sup>30</sup></a> These additional four satellites will be made during 12th FYP and will be launched in the beginning of 13th FYP (2018–23) in <a href="/facts/Geosynchronous_orbit/nR2yaeUg">geosynchronous orbit</a> of 42° inclination.<a class="footnote-ref" id="fnref:31" href="#fn:31"><sup>31</sup></a><a class="footnote-ref" id="fnref:32" href="#fn:32"><sup>32</sup></a> Also, the development of space-qualified Indian made atomic clocks was initiated,<a class="footnote-ref" id="fnref:33" href="#fn:33"><sup>33</sup></a> along with a study and development initiative for an all <a href="/facts/Optical_clock/MF8nsXDR">optical atomic clock</a> (ultra stable for IRNSS and <a href="/facts/Indian_Deep_Space_Network/IggLuu7l">deep space communication</a>).<a class="footnote-ref" id="fnref:34" href="#fn:34"><sup>34</sup></a><a class="footnote-ref" id="fnref:35" href="#fn:35"><sup>35</sup></a> </p><p>The NavIC Signal in Space ICD was released for evaluation in September 2014.<a class="footnote-ref" id="fnref:36" href="#fn:36"><sup>36</sup></a> </p><p>From 1 April 2019, use of <a href="/facts/Automotive_Industry_Standard_140/W09vzcgG">AIS 140</a> compliant NavIC-based vehicle tracking systems were made compulsory for all <a href="/facts/Commercial_vehicle/VoUW0CIH">commercial vehicles</a> in India.<a class="footnote-ref" id="fnref:37" href="#fn:37"><sup>37</sup></a><a class="footnote-ref" id="fnref:38" href="#fn:38"><sup>38</sup></a> </p><p>In December 2019, the <a href="/facts/United_States_Congress/mJlU46K7">United States Congress</a> consented to designate NaVIC as one of their allied navigational satellite systems along with <a href="/facts/Galileo_(satellite_navigation)/sPyWl594">Galileo</a> (Europe) and <a href="/facts/Quasi-Zenith_Satellite_System/YSEmeEQ8">QZSS</a> (Japan). The approval was as a part of <a href="/facts/National_Defense_Authorization_Act_for_Fiscal_Year_2020/yXhqgUcw">National Defense Authorization Act 2020</a>. The proposal was put forward by <a href="/facts/United_States_Secretary_of_Defense/K3ygWDbv">United States Secretary of Defense</a> in consultation with <a href="/facts/Director_of_National_Intelligence/AnV5cBUQ">Director of National Intelligence</a>.<a class="footnote-ref" id="fnref:39" href="#fn:39"><sup>39</sup></a><a class="footnote-ref" id="fnref:40" href="#fn:40"><sup>40</sup></a> </p> <h3>Clock failure</h3> <p>In 2017, it was announced that all three SpectraTime supplied <a href="/facts/Rubidium/KDHSe2HM">rubidium</a> <a href="/facts/Atomic_clock/MF8nsXDR">atomic clocks</a> on board <a href="/facts/IRNSS-1A/6NdS8UXw">IRNSS-1A</a> had failed, mirroring similar failures in the European Union's Galileo constellation.<a class="footnote-ref" id="fnref:41" href="#fn:41"><sup>41</sup></a><a class="footnote-ref" id="fnref:42" href="#fn:42"><sup>42</sup></a> 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.<a class="footnote-ref" id="fnref:43" href="#fn:43"><sup>43</sup></a> ISRO reported it had replaced the atomic clocks in the two standby satellites, IRNSS-1H and IRNSS-1I in June 2017.<a class="footnote-ref" id="fnref:44" href="#fn:44"><sup>44</sup></a> The subsequent launch of IRNSS-1H, as a replacement for IRNSS-1A, was unsuccessful when PSLV-C39 mission failed on 31 August 2017.<a class="footnote-ref" id="fnref:45" href="#fn:45"><sup>45</sup></a><a class="footnote-ref" id="fnref:46" href="#fn:46"><sup>46</sup></a> The second standby satellite, IRNSS-1I, was successfully placed into orbit on 12 April 2018.<a class="footnote-ref" id="fnref:47" href="#fn:47"><sup>47</sup></a> </p><p>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,<a class="footnote-ref" id="fnref:48" href="#fn:48"><sup>48</sup></a> in May 2018 a failure of a further 4 clocks was reported, taking the count to 9 of the 24 in orbit.<a class="footnote-ref" id="fnref:49" href="#fn:49"><sup>49</sup></a> </p><p>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.<a class="footnote-ref" id="fnref:50" href="#fn:50"><sup>50</sup></a> </p><p>As of May 2023 only four first generation satellites were capable of providing <a href="/facts/Satellite_navigation/lVgPlF5v">navigation</a> services<a class="footnote-ref" id="fnref:51" href="#fn:51"><sup>51</sup></a> which is the minimum number required for service to remain operational.<a class="footnote-ref" id="fnref:52" href="#fn:52"><sup>52</sup></a> </p><p>As of September 2024 only four satellites IRNSS-1B, IRNSS-1F, IRNSS-1I and NVS-01 were capable of providing <a href="/facts/Satellite_navigation/lVgPlF5v">navigation</a> services.<a class="footnote-ref" id="fnref:53" href="#fn:53"><sup>53</sup></a><a class="footnote-ref" id="fnref:54" href="#fn:54"><sup>54</sup></a> </p> <h3>Indian Atomic clock</h3> <p>In order to reduce the dependency on imported frequency standards ISRO's <a href="/facts/Space_Applications_Centre/jAFXtju6">Space Applications Centre</a> (SAC), Ahmedabad had been working on domestically designed and developed <a href="/facts/Rubidium_standard/A5vdC7tq">Rubidium based atomic clocks</a>.<a class="footnote-ref" id="fnref:55" href="#fn:55"><sup>55</sup></a><a class="footnote-ref" id="fnref:56" href="#fn:56"><sup>56</sup></a><a class="footnote-ref" id="fnref:57" href="#fn:57"><sup>57</sup></a><a class="footnote-ref" id="fnref:58" href="#fn:58"><sup>58</sup></a> To overcome the clock failures on first generation navigation satellites and its subsequent impact on NavIC's <a href="/facts/Position%2c_navigation%2c_and_timing/lVgPlF5v">position, navigation, and timing</a> services, these new clocks would supplement the imported atomic clocks in next generation of navigation satellites.<a class="footnote-ref" id="fnref:59" href="#fn:59"><sup>59</sup></a><a class="footnote-ref" id="fnref:60" href="#fn:60"><sup>60</sup></a><a class="footnote-ref" id="fnref:61" href="#fn:61"><sup>61</sup></a><a class="footnote-ref" id="fnref:62" href="#fn:62"><sup>62</sup></a> </p><p>On 5 July 2017, ISRO and <a href="/facts/Israel_Space_Agency/XXsUVPFv">Israel Space Agency</a> (ISA) signed an <a href="/facts/Memorandum_of_understanding/eyjDh7Nq">Memorandum of Understanding</a> to collaborate on space qualifying a <a href="/facts/Rubidium_standard/A5vdC7tq">Rubidium Standard</a> based on AccuBeat model AR133A and to test it on an ISRO satellite.<a class="footnote-ref" id="fnref:63" href="#fn:63"><sup>63</sup></a> </p><p>The clocks are utilised by the NVS series of satellites.<a class="footnote-ref" id="fnref:64" href="#fn:64"><sup>64</sup></a> As part of the Times Dissemination Project, which is overseen by the <a href="/facts/Ministry_of_Consumer_Affairs%2c_Food_and_Public_Distribution/6Mux8Czq">Ministry of Consumer Affairs, Food, and Public Distribution</a>, NavIC will take the position of GPS as the reference time provider at the <a href="/facts/National_Physical_Laboratory_of_India/KkdHbeVH">National Physical Laboratory of India</a> from 2025.<a class="footnote-ref" id="fnref:65" href="#fn:65"><sup>65</sup></a> </p> <h3>NavIC chip</h3> <p>In accordance with the range requirements for NavIC for both military and commercial applications, <a href="/facts/Defence_Research_and_Development_Organisation/HYTLS49D">Defence Research and Development Organisation</a>, 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.<a class="footnote-ref" id="fnref:66" href="#fn:66"><sup>66</sup></a> </p><p>In 2020, <a href="/facts/Qualcomm/v54S3UgA">Qualcomm</a> launched four Snapdragon <a href="/facts/4G/Lfq6mSxl">4G</a> chipsets and one <a href="/facts/5G/yVb460m4">5G</a> chipset with support for NavIC.<a class="footnote-ref" id="fnref:67" href="#fn:67"><sup>67</sup></a><a class="footnote-ref" id="fnref:68" href="#fn:68"><sup>68</sup></a> NavIC is planned to be available for civilian use in mobile devices, after Qualcomm and ISRO signed an agreement.<a class="footnote-ref" id="fnref:69" href="#fn:69"><sup>69</sup></a><a class="footnote-ref" id="fnref:70" href="#fn:70"><sup>70</sup></a> To increase compatibility with existing hardware, ISRO will add L1 band support. For strategic application, Long Code support is also coming.<a class="footnote-ref" id="fnref:71" href="#fn:71"><sup>71</sup></a><a class="footnote-ref" id="fnref:72" href="#fn:72"><sup>72</sup></a> </p><p>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 <a href="/facts/Time_to_first_fix/X1uTfwY2">Time to First Fix</a> (TTFF) position acquisition for enhanced <a href="/facts/Location-based_service/BXzwkD4d">location-based services</a>. 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.<a class="footnote-ref" id="fnref:73" href="#fn:73"><sup>73</sup></a><a class="footnote-ref" id="fnref:74" href="#fn:74"><sup>74</sup></a> </p> <h2 id="time-frame">Time-frame</h2> <p>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,<a class="footnote-ref" id="fnref:75" href="#fn:75"><sup>75</sup></a> and India also launched 3 new satellites to supplement this.<a class="footnote-ref" id="fnref:76" href="#fn:76"><sup>76</sup></a> </p><p>Seven satellites with the prefix "IRNSS-1" will constitute the space segment of the IRNSS. <a href="/facts/IRNSS-1A/6NdS8UXw">IRNSS-1A</a>, the first of the seven satellites, was launched on 1 July 2013.<a class="footnote-ref" id="fnref:77" href="#fn:77"><sup>77</sup></a><a class="footnote-ref" id="fnref:78" href="#fn:78"><sup>78</sup></a> <a href="/facts/IRNSS-1B/eID4bYbP">IRNSS-1B</a> was launched on 4 April 2014 on-board PSLV-C24 rocket. The satellite has been placed in <a href="/facts/Geosynchronous_orbit/nR2yaeUg">geosynchronous orbit</a>.<a class="footnote-ref" id="fnref:79" href="#fn:79"><sup>79</sup></a> <a href="/facts/IRNSS-1C/Ye51Te5X">IRNSS-1C</a> was launched on 16 October 2014,<a class="footnote-ref" id="fnref:80" href="#fn:80"><sup>80</sup></a> <a href="/facts/IRNSS-1D/1qt9Q7YX">IRNSS-1D</a> on 28 March 2015,<a class="footnote-ref" id="fnref:81" href="#fn:81"><sup>81</sup></a> <a href="/facts/IRNSS-1E/xM2Yyn2a">IRNSS-1E</a> on 20 January 2016,<a class="footnote-ref" id="fnref:82" href="#fn:82"><sup>82</sup></a> <a href="/facts/IRNSS-1F/2u05hwaz">IRNSS-1F</a> on 10 March 2016 and <a href="/facts/IRNSS-1G/tkkcEpxK">IRNSS-1G</a> was launched on 28 April 2016.<a class="footnote-ref" id="fnref:83" href="#fn:83"><sup>83</sup></a> </p><p>The eighth satellite, <a href="/facts/IRNSS-1H/z0emJP0G">IRNSS-1H</a>, which was meant to replace IRNSS-1A, failed to deploy on 31 August 2017 as the <a href="/facts/Payload_fairing/V1UezFkV">heat shields</a> failed to separate from the 4th stage of the rocket.<a class="footnote-ref" id="fnref:84" href="#fn:84"><sup>84</sup></a> <a href="/facts/IRNSS-1I/cYg4SJuQ">IRNSS-1I</a> was launched on 12 April 2018 to replace it.<a class="footnote-ref" id="fnref:85" href="#fn:85"><sup>85</sup></a><a class="footnote-ref" id="fnref:86" href="#fn:86"><sup>86</sup></a> </p> <h2 id="system-description">System description</h2> <p>The IRNSS system comprises a space segment and a support <a href="/facts/Ground_segment/BpUfqhx9">ground segment</a>. </p> <h3>Space segment</h3> <p>The constellation consists of 7 satellites. Three of the seven satellites are located in <a href="/facts/Geostationary_orbit/VBq1v5Kr">geostationary orbit</a> (GEO) at <a href="/facts/Longitude/HsC61ML9">longitudes</a> 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 <a href="/facts/Geosynchronous_orbit/nR2yaeUg">geosynchronous orbit</a> (GSO). Two of them cross the <a href="/facts/Equator/CjaxbVaN">equator</a> at 55° E and two at 111.75° E.<a class="footnote-ref" id="fnref:87" href="#fn:87"><sup>87</sup></a><a class="footnote-ref" id="fnref:88" href="#fn:88"><sup>88</sup></a><a class="footnote-ref" id="fnref:89" href="#fn:89"><sup>89</sup></a> </p> <h3>Ground segment</h3> <p>The ground segment is responsible for the maintenance and operation of the IRNSS constellation. The ground segment comprises:<a class="footnote-ref" id="fnref:90" href="#fn:90"><sup>90</sup></a> </p> <ul><li>IRNSS Spacecraft Control Facility (IRSCF)</li> <li>ISRO Navigation Centre (INC)</li> <li>IRNSS Range and Integrity Monitoring Stations (IRIMS)</li> <li>IRNSS Network Timing Centre (IRNWT)</li> <li>IRNSS CDMA Ranging Stations (IRCDR)</li> <li>Laser Ranging Stations</li> <li>IRNSS Data Communication Network (IRDCN)</li></ul> <p>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.<a class="footnote-ref" id="fnref:91" href="#fn:91"><sup>91</sup></a> Seven 7.2-metre (24 ft) FCA and two 11-metre (36 ft) FMA of IRSCF are currently operational for <a href="/facts/Launch_and_Early_Orbit_phase/rgh4vxHP">LEOP</a> and on-orbit phases of IRNSS satellites.<a class="footnote-ref" id="fnref:92" href="#fn:92"><sup>92</sup></a><a class="footnote-ref" id="fnref:93" href="#fn:93"><sup>93</sup></a> </p><p>The INC established at <a href="/facts/Byalalu/78KHd4fs">Byalalu</a> 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.<a class="footnote-ref" id="fnref:94" href="#fn:94"><sup>94</sup></a> </p><p>16 IRIMS are currently operational and are supporting IRNSS operations.<a class="footnote-ref" id="fnref:95" href="#fn:95"><sup>95</sup></a> A few more are planned in Brunei, Indonesia, Australia, Russia, France and Japan.<a class="footnote-ref" id="fnref:96" href="#fn:96"><sup>96</sup></a> <a href="/facts/Code-division_multiple_access/o2RLKE4M">CDMA</a> 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 <a href="/facts/Nanosecond/gARLTp4c">ns</a> (2.0×10−9 <a href="/facts/Second/jtFxnJXx">s</a>) (2 sigma) with respect to <a href="/facts/Coordinated_Universal_Time/2EnjfSyu">UTC</a>. Laser ranging is being carried out with the support of <a href="/facts/Satellite_laser_ranging/y5GjpCNF">ILRS</a> stations around the world. Navigation software is operational at INC since 1 Aug 2013. All the navigation parameters, such as satellite <a href="/facts/Ephemeris/vjQCBG29">ephemeris</a>, clock corrections, integrity parameters, and secondary parameters, such as iono-delay corrections, time offsets with respect to UTC and other <a href="/facts/GNSS/lVgPlF5v">GNSSes</a>, <a href="/facts/GPS_Almanac/hh5vT4YF">almanac</a>, text message, and earth orientation parameters, are generated and uploaded to the spacecraft automatically. The IRDCN has established terrestrial and <a href="/facts/Very-small-aperture_terminal/L4HjYjAu">VSAT</a> links between the ground stations. As of March 2021, ISRO and <a href="/facts/JAXA/ofUpflgf">JAXA</a> are performing calibration and validation experiments for NavIC ground reference station in Japan.<a class="footnote-ref" id="fnref:97" href="#fn:97"><sup>97</sup></a> ISRO is also under discussion with <a href="/facts/CNES/4eJbr1fQ">CNES</a> for a NavIC ground reference station in France.<a class="footnote-ref" id="fnref:98" href="#fn:98"><sup>98</sup></a> ISRO is planning a NavIC ground station at <a href="/facts/Cocos_(Keeling)_Islands/NjoIHjsP">Cocos (Keeling) Islands</a> and is in talks with the <a href="/facts/Australian_Space_Agency/eY3ofkLL">Australian Space Agency</a>.<a class="footnote-ref" id="fnref:99" href="#fn:99"><sup>99</sup></a> </p> <h3>Signal</h3> <p>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).<a class="footnote-ref" id="fnref:100" href="#fn:100"><sup>100</sup></a> The SPS signal will be modulated by a 1 MHz <a href="/facts/QPSK/TFnpYe64">BPSK</a> signal. The Restricted Service will use <a href="/facts/Binary_offset_carrier/2pNFPFYg">BOC(5,2)</a>. 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. </p><p>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.<a class="footnote-ref" id="fnref:101" href="#fn:101"><sup>101</sup></a> </p> <h3>Accuracy</h3> <p>The Standard Positioning Service system is intended to provide an absolute position accuracy of about 5 to 10 metres throughout the <a href="/facts/Geography_of_India/kTMF3Xjb">Indian landmass</a> 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.<a class="footnote-ref" id="fnref:102" href="#fn:102"><sup>102</sup></a><a class="footnote-ref" id="fnref:103" href="#fn:103"><sup>103</sup></a> GPS, for comparison, has a position accuracy of 5 m under ideal conditions.<a class="footnote-ref" id="fnref:104" href="#fn:104"><sup>104</sup></a> 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.<a class="footnote-ref" id="fnref:105" href="#fn:105"><sup>105</sup></a> </p> <h2 id="future-developments">Future developments</h2> <h3>NVS series</h3> <p>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 <a href="/facts/GPS_signals/hh5vT4YF">L1 band</a> in the navigation payload and will use Indian <a href="/facts/Rubidium_standard/A5vdC7tq">Rubidium Atomic Frequency Standard</a> (iRAFS.)<a class="footnote-ref" id="fnref:106" href="#fn:106"><sup>106</sup></a><a class="footnote-ref" id="fnref:107" href="#fn:107"><sup>107</sup></a><a class="footnote-ref" id="fnref:108" href="#fn:108"><sup>108</sup></a><a class="footnote-ref" id="fnref:109" href="#fn:109"><sup>109</sup></a> This introduction of the new L1 band will help facilitate NavIC proliferation in <a href="/facts/Wearable_technology/HBSY4P0x">wearable smart</a> and <a href="/facts/Internet_of_things/rwwGAxn3">IoT</a> devices featuring a low power navigation system. <a href="/facts/NVS-01/s4nF4eDC">NVS-01</a> is a replacement for <a href="/facts/IRNSS-1G/tkkcEpxK">IRNSS-1G</a> satellite and was launched on <a href="/facts/Geosynchronous_Satellite_Launch_Vehicle/PBneb7NS">GSLV</a> in 2023.<a class="footnote-ref" id="fnref:110" href="#fn:110"><sup>110</sup></a><a class="footnote-ref" id="fnref:111" href="#fn:111"><sup>111</sup></a><a class="footnote-ref" id="fnref:112" href="#fn:112"><sup>112</sup></a> </p><p>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 <a href="/facts/Indian_Armed_Forces/B4go58SS">Indian Armed Forces</a>. 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).<a class="footnote-ref" id="fnref:113" href="#fn:113"><sup>113</sup></a><a class="footnote-ref" id="fnref:114" href="#fn:114"><sup>114</sup></a> </p><p>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.<a class="footnote-ref" id="fnref:115" href="#fn:115"><sup>115</sup></a> </p> <h3>Global Indian Navigation System</h3> <p>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).<a class="footnote-ref" id="fnref:116" href="#fn:116"><sup>116</sup></a> The system is supposed to have a constellation of 24 satellites, positioned 24,000 km (14,913 mi) above Earth. As of 2013, the <a href="/facts/Statutory/10qGu7zM">statutory filing</a> for <a href="/facts/Frequency_spectrum/q3Rfs7b0">frequency spectrum</a> of GINS satellite orbits in international space, has been completed.<a class="footnote-ref" id="fnref:117" href="#fn:117"><sup>117</sup></a> As per new 2021 draft policy,<a class="footnote-ref" id="fnref:118" href="#fn:118"><sup>118</sup></a> ISRO and <a href="/facts/Department_of_Space/NeRvPSj4">Department of Space</a> (DoS) is working on expanding the coverage of NavIC from regional to global that will be independent of other such system currently operational namely <a href="/facts/GPS/DKVLnzF3">GPS</a>, <a href="/facts/GLONASS/sLh1vQ6p">GLONASS</a>, <a href="/facts/BeiDou/eW9Ex0WP">BeiDou</a> and <a href="/facts/Galileo_(satellite_navigation)/sPyWl594">Galileo</a> while remaining interoperable and free for global public use.<a class="footnote-ref" id="fnref:119" href="#fn:119"><sup>119</sup></a> ISRO has proposed to Government of India to expand the constellation for global coverage by initially placing twelve satellites in <a href="/facts/Medium_Earth_orbit/7Qmz5XxG">Medium Earth Orbit</a> (MEO).<a class="footnote-ref" id="fnref:120" href="#fn:120"><sup>120</sup></a> </p> <h2 id="list-of-satellites">List of satellites</h2> <p>The constellation consists of 7 active satellites. Three of the seven satellites in constellation are located in <a href="/facts/Geostationary_orbit/VBq1v5Kr">geostationary orbit</a> (GEO) and four are in inclined <a href="/facts/Geosynchronous_orbit/nR2yaeUg">geosynchronous orbit</a> (IGSO). All satellites launched or proposed for the system are as follows: </p> <h3>IRNSS series satellites</h3> IRNSS-1 series satellites<a class="footnote-ref" id="fnref:121" href="#fn:121"><sup>121</sup></a><a class="footnote-ref" id="fnref:122" href="#fn:122"><sup>122</sup></a><table><tbody><tr><th>Satellite</th><th>SVN</th><th>PRN</th><th>Int. Sat. ID</th><th>NORAD ID</th><th>Launch Date</th><th>Launch Vehicle</th><th>Orbit</th><th>Status</th><th>Remarks</th></tr><tr><td><a href="/facts/IRNSS-1A/6NdS8UXw">IRNSS-1A</a></td><td>I001</td><td>I01</td><td>2013-034A</td><td>39199</td><td>1 July 2013</td><td>PSLV-XL-C22</td><td>Geosynchronous (IGSO) / 55°E, 29° inclined orbit</td><td>Partial Failure</td><td><a href="/facts/Atomic_clock/MF8nsXDR">Atomic clocks</a> failed. The satellite is being used for NavIC's short message broadcast service.<a class="footnote-ref" id="fnref:123" href="#fn:123"><sup>123</sup></a><a class="footnote-ref" id="fnref:124" href="#fn:124"><sup>124</sup></a><a class="footnote-ref" id="fnref:125" href="#fn:125"><sup>125</sup></a></td></tr><tr><td><a href="/facts/IRNSS-1B/eID4bYbP">IRNSS-1B</a></td><td>I002</td><td>I02</td><td>2014-017A</td><td>39635</td><td>4 April 2014</td><td>PSLV-XL-C24</td><td>Geosynchronous (IGSO) / 55°E, 29° inclined orbit</td><td>Operational</td><td><a class="footnote-ref" id="fnref:126" href="#fn:126"><sup>126</sup></a></td></tr><tr><td><a href="/facts/IRNSS-1C/Ye51Te5X">IRNSS-1C</a></td><td>I003</td><td>I03</td><td>2014-061A</td><td>40269</td><td>16 October 2014</td><td>PSLV-XL-C26</td><td>Geostationary (GEO) / 83°E, 5° inclined orbit</td><td>Partial Failure</td><td><a class="footnote-ref" id="fnref:127" href="#fn:127"><sup>127</sup></a></td></tr><tr><td><a href="/facts/IRNSS-1D/1qt9Q7YX">IRNSS-1D</a></td><td>I004</td><td>I04</td><td>2015-018A</td><td>40547</td><td>28 March 2015</td><td>PSLV-XL-C27</td><td>Geosynchronous (IGSO) / 111.75°E, 31° inclined orbit</td><td>Partial Failure</td><td><a class="footnote-ref" id="fnref:128" href="#fn:128"><sup>128</sup></a><a class="footnote-ref" id="fnref:129" href="#fn:129"><sup>129</sup></a><a class="footnote-ref" id="fnref:130" href="#fn:130"><sup>130</sup></a></td></tr><tr><td><a href="/facts/IRNSS-1E/xM2Yyn2a">IRNSS-1E</a></td><td>I005</td><td>I05</td><td>2016-003A</td><td>41241</td><td>20 January 2016</td><td>PSLV-XL-C31</td><td>Geosynchronous (IGSO) / 111.75°E, 29° inclined orbit</td><td>Partial Failure</td><td>The satellite is being used for NavIC's short message broadcast service.<a class="footnote-ref" id="fnref:131" href="#fn:131"><sup>131</sup></a><a class="footnote-ref" id="fnref:132" href="#fn:132"><sup>132</sup></a><a class="footnote-ref" id="fnref:133" href="#fn:133"><sup>133</sup></a></td></tr><tr><td><a href="/facts/IRNSS-1F/2u05hwaz">IRNSS-1F</a></td><td>I006</td><td>I06</td><td>2016-015A</td><td>41384</td><td>10 March 2016</td><td>PSLV-XL-C32</td><td>Geostationary (GEO) / 32.5°E, 5° inclined orbit</td><td>Operational</td><td><a class="footnote-ref" id="fnref:134" href="#fn:134"><sup>134</sup></a></td></tr><tr><td><a href="/facts/IRNSS-1G/tkkcEpxK">IRNSS-1G</a></td><td>I007</td><td>I07</td><td>2016-027A</td><td>41469</td><td>28 April 2016</td><td>PSLV-XL-C33</td><td>Geostationary (GEO) / 129.5°E, 5.1° inclined orbit</td><td>Partial Failure</td><td>Replaced by NVS-01.Currently being used for NavIC's short message broadcast service.<a class="footnote-ref" id="fnref:135" href="#fn:135"><sup>135</sup></a><a class="footnote-ref" id="fnref:136" href="#fn:136"><sup>136</sup></a><a class="footnote-ref" id="fnref:137" href="#fn:137"><sup>137</sup></a></td></tr><tr><td><a href="/facts/IRNSS-1H/z0emJP0G">IRNSS-1H</a></td><td>I008</td><td>I08</td><td></td><td></td><td>31 August 2017</td><td>PSLV-XL-C39</td><td>Geosynchronous (IGSO) / 55°E, 29° inclined orbit</td><td>Launch Failed</td><td>The <a href="/facts/Payload_fairing/V1UezFkV">payload fairing</a> failed to separate and satellite could not reach the desired orbit.<a class="footnote-ref" id="fnref:138" href="#fn:138"><sup>138</sup></a><a class="footnote-ref" id="fnref:139" href="#fn:139"><sup>139</sup></a> It was meant to replace defunct IRNSS-1A.<a class="footnote-ref" id="fnref:140" href="#fn:140"><sup>140</sup></a><a class="footnote-ref" id="fnref:141" href="#fn:141"><sup>141</sup></a></td></tr><tr><td><a href="/facts/IRNSS-1I/cYg4SJuQ">IRNSS-1I</a></td><td>I009</td><td>I09</td><td>2018-035A</td><td>43286</td><td>12 April 2018</td><td>PSLV-XL-C41</td><td>Geosynchronous (IGSO) / 55°E, 29° inclined orbit</td><td>Operational</td><td><a class="footnote-ref" id="fnref:142" href="#fn:142"><sup>142</sup></a></td></tr></tbody></table> <h3>NVS series satellite</h3> NVS series satellites<a class="footnote-ref" id="fnref:143" href="#fn:143"><sup>143</sup></a><a class="footnote-ref" id="fnref:144" href="#fn:144"><sup>144</sup></a><table><tbody><tr><th>Satellite</th><th>SVN</th><th>PRN</th><th>Int. Sat. ID</th><th>NORAD ID</th><th>Launch Date</th><th>Launch Vehicle</th><th>Orbit</th><th>Status</th><th>Remarks</th></tr><tr><td><a href="/facts/NVS-01/s4nF4eDC">NVS-01</a> (IRNSS-1J)</td><td>I010</td><td>I10</td><td>2023-076A</td><td>56759</td><td>29 May 2023<a class="footnote-ref" id="fnref:145" href="#fn:145"><sup>145</sup></a><a class="footnote-ref" id="fnref:146" href="#fn:146"><sup>146</sup></a></td><td><a href="/facts/GSLV_Mk_II/PBneb7NS">GSLV Mk II</a> - <a href="/facts/GSLV-F12/9z8I9SHH">F12</a><a class="footnote-ref" id="fnref:147" href="#fn:147"><sup>147</sup></a></td><td>Geostationary (GEO) / 129.5°E, 5.1° inclined orbit</td><td>Operational</td><td>Replaced <a href="/facts/IRNSS-1G/tkkcEpxK">IRNSS-1G</a>. Features extended lifespan, indigenous clock and new civilian band L1 for low power devices.<a class="footnote-ref" id="fnref:148" href="#fn:148"><sup>148</sup></a><a class="footnote-ref" id="fnref:149" href="#fn:149"><sup>149</sup></a><a class="footnote-ref" id="fnref:150" href="#fn:150"><sup>150</sup></a></td></tr><tr><td><a href="/facts/NVS-02/qchREo4X">NVS-02</a> (IRNSS-1K)</td><td></td><td></td><td></td><td></td><td>29 January 2025<a class="footnote-ref" id="fnref:151" href="#fn:151"><sup>151</sup></a></td><td><a href="/facts/GSLV_Mk_II/PBneb7NS">GSLV Mk II</a> - <a href="/facts/GSLV-F15/EcDoGmxr">F15</a></td><td></td><td>Partial Failure</td><td>Intended replacement of malfunctioning <a href="/facts/IRNSS-1E/xM2Yyn2a">IRNSS-1E</a> satellite.<a class="footnote-ref" id="fnref:152" href="#fn:152"><sup>152</sup></a><a class="footnote-ref" id="fnref:153" href="#fn:153"><sup>153</sup></a><a class="footnote-ref" id="fnref:154" href="#fn:154"><sup>154</sup></a> However, NVS-02 suffered from a propulsion system failure and the ISRO is looking for alternative uses for the satellite.<a class="footnote-ref" id="fnref:155" href="#fn:155"><sup>155</sup></a><a class="footnote-ref" id="fnref:156" href="#fn:156"><sup>156</sup></a></td></tr><tr><td>NVS-03 (IRNSS-1L)</td><td></td><td></td><td></td><td></td><td>2026</td><td><a href="/facts/GSLV_Mk_II/PBneb7NS">GSLV Mk II</a></td><td>Geosynchronous (IGSO), 32.5°E or 129.5°E, 29° inclined orbit</td><td>Planned</td><td><a class="footnote-ref" id="fnref:157" href="#fn:157"><sup>157</sup></a></td></tr><tr><td>NVS-04 (IRNSS-IM)</td><td></td><td></td><td></td><td></td><td>2026</td><td><a href="/facts/GSLV_Mk_II/PBneb7NS">GSLV Mk II</a></td><td>Geosynchronous (IGSO), 32.5°E or 129.5°E, 29° inclined orbit</td><td>Planned</td><td><a class="footnote-ref" id="fnref:158" href="#fn:158"><sup>158</sup></a><a class="footnote-ref" id="fnref:159" href="#fn:159"><sup>159</sup></a><a class="footnote-ref" id="fnref:160" href="#fn:160"><sup>160</sup></a></td></tr><tr><td>NVS-05 (IRNSS-1N)</td><td></td><td></td><td></td><td></td><td>2027</td><td><a href="/facts/GSLV_Mk_II/PBneb7NS">GSLV Mk II</a></td><td>Geosynchronous (IGSO), 32.5°E or 129.5°E, 29° inclined orbit</td><td>Planned</td><td><a class="footnote-ref" id="fnref:161" href="#fn:161"><sup>161</sup></a><a class="footnote-ref" id="fnref:162" href="#fn:162"><sup>162</sup></a><a class="footnote-ref" id="fnref:163" href="#fn:163"><sup>163</sup></a></td></tr><tr><td>NVS-06 (IRNSS-1O)</td><td></td><td></td><td></td><td></td><td>2028</td><td></td><td></td><td>Planned</td><td><a class="footnote-ref" id="fnref:164" href="#fn:164"><sup>164</sup></a></td></tr><tr><td>NVS-07 (IRNSS-1P)</td><td></td><td></td><td></td><td></td><td>2029</td><td></td><td></td><td>Planned</td><td><a class="footnote-ref" id="fnref:165" href="#fn:165"><sup>165</sup></a></td></tr></tbody></table> <h2 id="see-also">See also</h2> <ul><li><a href="/facts/Bhuvan/b1ImPHVT">Bhuvan</a></li> <li><a href="/facts/Indian_Space_Research_Organisation/CdAoFQTL">Indian Space Research Organisation</a></li> <li><a href="/facts/GPS-aided_GEO_augmented_navigation/PCuB48Lk">GPS-aided GEO augmented navigation</a> (GAGAN)</li> <li><a href="/facts/Quasi-Zenith_Satellite_System/YSEmeEQ8">Quasi-Zenith Satellite System</a> (QZSS)</li></ul> <h3>Footnotes</h3> <ol><li>^ SATNAV Industry Meet 2006. ISRO Space India Newsletter. April – September 2006 Issue.</li></ol> <h2 id="external-links">External links</h2> <ul><li><a href="https://www.isro.gov.in/irnss-programme">IRNNS programme</a> <a href="https://web.archive.org/web/20220302041206/https://www.isro.gov.in/irnss-programme">Archived</a> 2 March 2022 at the <a href="/facts/Wayback_Machine/nmQ3a6JC">Wayback Machine</a></li> <li><a href="https://www.isro.gov.in/SatelliteNavigationServices.html">Official Website</a></li> <li><a href="https://www.isro.gov.in/IRNSS_Programme.html">IRNSS Programme</a> at ISRO</li></ul> <h2 id="references">References</h2> <ol> <li id="fn:1"><p>"IRNSS-1G exemplifies 'Make in India', says PM". The Statesman. 28 April 2016. Archived from the original on 23 September 2016. Retrieved 28 April 2016. <a href="https://web.archive.org/web/20160923005239/http://www.thestatesman.com/mobi/news/latest-headlines/irnss-1g-exemplifies-make-in-india--says-pm/139068.html" target="_blank">https://web.archive.org/web/20160923005239/http://www.thestatesman.com/mobi/news/latest-headlines/irnss-1g-exemplifies-make-in-india--says-pm/139068.html</a> <a href="#fnref:1" class="footnote-back-ref">↩</a></p></li> <li id="fn:2"><p>"Satellites are in the sky, but long way to go before average Indians get Desi GPS | India News - Times of India". The Times of India. 8 June 2018. <a href="https://timesofindia.indiatimes.com/india/satellites-are-in-the-sky-but-long-way-to-go-before-average-indians-get-desi-gps/articleshow/64506628.cms" target="_blank">https://timesofindia.indiatimes.com/india/satellites-are-in-the-sky-but-long-way-to-go-before-average-indians-get-desi-gps/articleshow/64506628.cms</a> <a href="#fnref:2" class="footnote-back-ref">↩</a></p></li> <li id="fn:3"><p>"Isro working to expand navigation system NaVIC coverage to 3,000 km from 1,500 km beyond India". The Times of India. 27 September 2023. ISSN 0971-8257. Retrieved 25 April 2024. <a href="https://timesofindia.indiatimes.com/home/science/isro-working-to-expand-navigation-system-navic-coverage-to-3000-km-from-1500-km-beyond-india/articleshow/103970279.cms" target="_blank">https://timesofindia.indiatimes.com/home/science/isro-working-to-expand-navigation-system-navic-coverage-to-3000-km-from-1500-km-beyond-india/articleshow/103970279.cms</a> <a href="#fnref:3" class="footnote-back-ref">↩</a></p></li> <li id="fn:4"><p>"IRNSS Programme - ISRO". isro.gov.in. Archived from the original on 2 March 2022. Retrieved 14 July 2018. <a href="https://web.archive.org/web/20220302041206/https://www.isro.gov.in/irnss-programme" target="_blank">https://web.archive.org/web/20220302041206/https://www.isro.gov.in/irnss-programme</a> <a href="#fnref:4" class="footnote-back-ref">↩</a></p></li> <li id="fn:5"><p>"NavIC: How is India's very own navigation service different from US-owned GPS?". Firstpost. 27 September 2022. Retrieved 16 October 2022. <a href="https://www.firstpost.com/tech/news-analysis/navic-how-is-indias-very-own-navigation-service-different-from-us-owned-gps-11342771.html" target="_blank">https://www.firstpost.com/tech/news-analysis/navic-how-is-indias-very-own-navigation-service-different-from-us-owned-gps-11342771.html</a> <a href="#fnref:5" class="footnote-back-ref">↩</a></p></li> <li id="fn:6"><p>"Orbit height and info". Archived from the original on 30 December 2015. <a href="https://web.archive.org/web/20151230083702/http://www.sac.gov.in/SACSITE/IRNSS-1A.html" target="_blank">https://web.archive.org/web/20151230083702/http://www.sac.gov.in/SACSITE/IRNSS-1A.html</a> <a href="#fnref:6" class="footnote-back-ref">↩</a></p></li> <li id="fn:7"><p>"IRNSS details". Archived from the original on 10 March 2016. <a href="https://web.archive.org/web/20160310163951/http://www.isro.gov.in/irnss-programme/towards-self-reliance-navigation-irnss" target="_blank">https://web.archive.org/web/20160310163951/http://www.isro.gov.in/irnss-programme/towards-self-reliance-navigation-irnss</a> <a href="#fnref:7" class="footnote-back-ref">↩</a></p></li> <li id="fn:8"><p>"Isro to launch 5th navigation satellite on Jan 20, first in 2016". Hindustan Times. 18 January 2016. <a href="http://www.hindustantimes.com/india/isro-starts-countdown-to-launch-fifth-navigation-satellite-irnss-1e/story-qSv6U8T8dT4pRThRHc3VIO.html" target="_blank">http://www.hindustantimes.com/india/isro-starts-countdown-to-launch-fifth-navigation-satellite-irnss-1e/story-qSv6U8T8dT4pRThRHc3VIO.html</a> <a href="#fnref:8" class="footnote-back-ref">↩</a></p></li> <li id="fn:9"><p>Rohit KVN (28 May 2017). "India's own GPS IRNSS NavIC made by ISRO to go live in early 2018". International Business Times. <a href="https://www.ibtimes.co.in/indias-own-gps-irnss-navic-made-by-isro-go-live-early-2018-728409" target="_blank">https://www.ibtimes.co.in/indias-own-gps-irnss-navic-made-by-isro-go-live-early-2018-728409</a> <a href="#fnref:9" class="footnote-back-ref">↩</a></p></li> <li id="fn:10"><p>"Isro's PSLV-C32 places India's sixth navigation satellite IRNSS-1F in orbit". The Times of India. <a href="http://timesofindia.indiatimes.com/india/Isros-PSLV-C32-places-Indias-sixth-navigation-satellite-IRNSS-1F-in-orbit/articleshow/51343491.cms" target="_blank">http://timesofindia.indiatimes.com/india/Isros-PSLV-C32-places-Indias-sixth-navigation-satellite-IRNSS-1F-in-orbit/articleshow/51343491.cms</a> <a href="#fnref:10" class="footnote-back-ref">↩</a></p></li> <li id="fn:11"><p>"ISRO puts seventh and final IRNSS navigation satellite into orbit". The Times of India. Archived from the original on 17 May 2017. 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Retrieved 3 February 2025. <a href="http://web.archive.org/web/20160424043359/http://www.business-standard.com/article/current-affairs/isro-conducts-4th-orbit-raising-operation-of-irnss-1b-successfully-114040800952_1.html" target="_blank">http://web.archive.org/web/20160424043359/http://www.business-standard.com/article/current-affairs/isro-conducts-4th-orbit-raising-operation-of-irnss-1b-successfully-114040800952_1.html</a> <a href="#fnref:126" class="footnote-back-ref">↩</a></p></li> <li id="fn:127"><p>Sardar Patel Memorial Lecture 2024 'Indian Space Odyssey In Search of New Frontiers' by S. Somanath. 31 October 2024. Event occurs at 47 min 20 sec. Four satellites providing PNT service (IRNSS-1B, 1F, 1I,and NVS-01). <a href="https://www.youtube.com/watch?v=4Fy63bgQNGE&t=2840s" target="_blank">https://www.youtube.com/watch?v=4Fy63bgQNGE&t=2840s</a> <a href="#fnref:127" class="footnote-back-ref">↩</a></p></li> <li id="fn:128"><p>"Launch of IRNSS-1D Delayed Due to Technical Problem". Inside GNSS. 5 March 2015. Retrieved 3 February 2025. <a href="https://insidegnss.com/launch-of-irnss-1d-delayed-due-to-technical-problem/" target="_blank">https://insidegnss.com/launch-of-irnss-1d-delayed-due-to-technical-problem/</a> <a href="#fnref:128" class="footnote-back-ref">↩</a></p></li> <li id="fn:129"><p>Jayaraman, K. S. (30 March 2015). "India Launches Fourth Navigation Satellite". SpaceNews. Retrieved 3 February 2025. <a href="https://spacenews.com/india-launches-fourth-navigation-satellite/" target="_blank">https://spacenews.com/india-launches-fourth-navigation-satellite/</a> <a href="#fnref:129" class="footnote-back-ref">↩</a></p></li> <li id="fn:130"><p>"DoS Annual Report 2023-24" (PDF). p. 58. 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. <a href="https://www.isro.gov.in/media_isro/pdf/AnnualReport/Annual_Report_2023_24_English.pdf" target="_blank">https://www.isro.gov.in/media_isro/pdf/AnnualReport/Annual_Report_2023_24_English.pdf</a> <a href="#fnref:130" class="footnote-back-ref">↩</a></p></li> <li id="fn:131"><p>"NavIC and GAGAN System Updates" (PDF). Retrieved 1 June 2023. NavIC is offering short messaging service for users in Indian region through IRNSS-1A and 1E satellites. <a href="https://www.unoosa.org/documents/pdf/icg/2022/ICG16/05.pdf" target="_blank">https://www.unoosa.org/documents/pdf/icg/2022/ICG16/05.pdf</a> <a href="#fnref:131" class="footnote-back-ref">↩</a></p></li> <li id="fn:132"><p>"NavIC (IRNSS) Standard Positioning Service Performance Report Oct-Dec 2021" (PDF). p. 5. IRNSS 1G is not available for performance evaluation since October 05, 2019. IRNSS 1E is not available for performance evaluation since August 04, 2021 <a href="https://www.isro.gov.in/media_isro/pdf/Missions/pe_report_q4_2021.pdf" target="_blank">https://www.isro.gov.in/media_isro/pdf/Missions/pe_report_q4_2021.pdf</a> <a href="#fnref:132" class="footnote-back-ref">↩</a></p></li> <li id="fn:133"><p>"DoS Annual Report 2023-24" (PDF). p. 58. 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. <a href="https://www.isro.gov.in/media_isro/pdf/AnnualReport/Annual_Report_2023_24_English.pdf" target="_blank">https://www.isro.gov.in/media_isro/pdf/AnnualReport/Annual_Report_2023_24_English.pdf</a> <a href="#fnref:133" class="footnote-back-ref">↩</a></p></li> <li id="fn:134"><p>T.K., Rohit (10 March 2016). "India's sixth navigation satellite, IRNSS-1F, placed in orbit". The Hindu. ISSN 0971-751X. 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IRNSS-1A and IRNSS-1G are currently being used for short messaging services. <a href="https://web.archive.org/web/20210425173704/https://www.isro.gov.in/sites/default/files/anual_report_2020-2021_english.pdf" target="_blank">https://web.archive.org/web/20210425173704/https://www.isro.gov.in/sites/default/files/anual_report_2020-2021_english.pdf</a> <a href="#fnref:135" class="footnote-back-ref">↩</a></p></li> <li id="fn:136"><p>"NavIC (IRNSS) Standard Positioning Service Performance Report Oct-Dec 2021" (PDF). p. 5. IRNSS 1G is not available for performance evaluation since October 05, 2019. IRNSS 1E is not available for performance evaluation since August 04, 2021 <a href="https://www.isro.gov.in/media_isro/pdf/Missions/pe_report_q4_2021.pdf" target="_blank">https://www.isro.gov.in/media_isro/pdf/Missions/pe_report_q4_2021.pdf</a> <a href="#fnref:136" class="footnote-back-ref">↩</a></p></li> <li id="fn:137"><p>"DoS Annual Report 2023-24" (PDF). p. 58. 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. <a href="https://www.isro.gov.in/media_isro/pdf/AnnualReport/Annual_Report_2023_24_English.pdf" target="_blank">https://www.isro.gov.in/media_isro/pdf/AnnualReport/Annual_Report_2023_24_English.pdf</a> <a href="#fnref:137" class="footnote-back-ref">↩</a></p></li> <li id="fn:138"><p>"ISRO says launch of navigation satellite IRNSS-1H unsuccessful". The Economic Times. 31 August 2017. Retrieved 31 August 2017. <a href="http://economictimes.indiatimes.com/news/science/isros-irnss-1h-launch-a-big-leap-for-private-sector-in-space/articleshow/60309043.cms" target="_blank">http://economictimes.indiatimes.com/news/science/isros-irnss-1h-launch-a-big-leap-for-private-sector-in-space/articleshow/60309043.cms</a> <a href="#fnref:138" class="footnote-back-ref">↩</a></p></li> <li id="fn:139"><p>"IRNSS-1H launch unsuccessful, says ISRO". 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