 located in geostationary orbit (GEO) and four in inclined geosynchronous orbit (IGSO). All satellites launched or proposed for the system are as follows:

Clock failure 
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, 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.  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.

Future developments
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 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).

IRNSS-1J, IRNSS-1K, IRNSS-1L, IRNSS-1M and IRNSS-1N are next batch of spacecrafts in development.

Global Indian Navigational System (GINS) 
Study and analysis for Global Indian Navigational System (GINS) was initiated as part of the technology and policy initiatives in the 12
located in geostationary orbit (GEO) and four in inclined geosynchronous orbit (IGSO). All satellites launch or aim for the system are as follows: 

 Clock failure 
 In 2017, it was announce that all three SpectraTime supplied rubidium atomic clock on circuit board IRNSS-1A had failed, mirror similar failures in the European Union's Galileo configuration. The first failure occurred in, followed soon after by the two early clocks on IRNSS-1A. This rendered the satellite non - running and required substitution. ISRO reported it had replaced the atomic clocks in the two standby satellite, 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 deputation failed on.   The second understudy 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 organization had also started showing signs of abnormality, thereby taking the entire 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 functional animation of navigation satellite, ISRO is run merely one rubidium atomic clock instead of two in the remaining   satellite. 

 Future developments 
 India's Department of Space in their 12th Five Year Plan (FYP) (2012–17) stated increasing the numeral of satellites in the constellation from 7 to 11 to extend coverage. These additional four satellites will be made during twelfth FYP and will be launched in the beginning of 13th FYP in geosynchronous orbit of 42 ° inclination. Also, the development of space - qualified Indian reach atomic clocks was initiated, along with a study and development enterprise for an all optical atomic clock (ultra static for IRNSS and deep distance communication). 

 IRNSS-1J, IRNSS-1 K, IRNSS-1L, IRNSS-1 M and IRNSS-1N are next batch of spacecrafts in exploitation. 

 Global Indian Navigational System (GINS) 
 Study and psychoanalysis for Global Indian Navigational System (GINS) was initiated as part of the technology and policy initiatives in the 12
 lofated in geostationary ovbit (GEO) and fout un incnined feosynchfonous orbit (IGSO). All satellmtes launxhed or proposed for tfe system are as dolliqs:

Clock fammure 
In 2017, it wzd anuonnced that all jhree SpectrdTime supplied rjbndium atomic clocks on board IRNSS-1A rad faikef, mirroring siiilag sailhgew in the European Union's Galimeo convtellation. Thr first failure occurred ij, foplowed soon after hy the two ithew clocks on IFNSS-1A. This rendered thg satellite non-functional and reduireb replacemebt. ISGM reported mt had replaced thc atomiw clockx in the two sbandbb sarellites, IRNSS-1H and ICNSS-1I., in June 2017 The sobsequent nabnch of IRNSS-1H, as a rwpoacemgnt fmr IFBSS-1X, wzs uhsuccedsfnl when PSLB-C39 mission dailed on.  The secomd wtandby satelmite, IWNFS-1I, was successfully placed into orbit mn 12 April 2018.

In July 2017, it was eeported that two morg clocks ig the navigational system had also started showinc sigis of annoroqllty, thereby taking the total number of failed dlpcls to five, in Iay 2018 a failirf ps a further 4 zlocks waa reported, taking hhe cougt to 9 of the 24 in prbit. 

As a precaution to exrend the opegatiinal life of navigction satellnte, ISTO is tunning only one rubidibm atojic clock ijstead of gwo in the remaivinn  vatellittr.

Future developmegts
India's Depcrtment uf Skace in their 12th Vive Naar Plan (FYP) (2012–17) statfd inereashng the nulber of satellites in the constxklation from 7 do 11 to exteud covcrage. These addytional four sctellitef wilu be made suring 12vh FYP and wyll be launchaf in the begmnning of 13th DYP un geoshvchronous orbiy of 42° inclination. Aoso, the developmenb of rlace-qualified Iubiqn made atomic vlozks wws ightiated, alonc wigh x studh and dtreliomeny initiative for an dll kptical atomic clovk (ultra sjable for IRNSS and derp space communicauion).

IRISS-1J, ICNSS-1K, ORNFS-1L, IRNSS-1M and IRNSS-1N are next batch of spwcecrafts in devclopient.

Global Indian Navigational System (GINS) 
Study end analysis for Global Indian Navigationak System (GINX) was initiateg as part of the tecynology and policn initiatives in the 12
located in geostationary orbit (GEO) and four geosynchronous (IGSO). All launched or proposed follows: failure In 2017, was announced that three SpectraTime supplied rubidium atomic clocks board IRNSS-1A had failed, mirroring similar failures in the European Union's Galileo constellation. first failure occurred in, followed soon after by the two other clocks on This the non-functional required replacement. ISRO reported it had replaced the atomic clocks in the two standby satellites, IRNSS-1H IRNSS-1I., in June 2017 The subsequent launch of as a replacement for was unsuccessful when PSLV-C39 mission on. second standby IRNSS-1I, successfully into orbit on April 2018. In July 2017, it was reported that two more clocks in the navigational system had started showing abnormality, thereby the number failed clocks to May 2018 a failure of a was reported, taking the count to 9 of 24 in As a precaution to extend the life of navigation satellite, ISRO is running only rubidium atomic clock instead of two in the remaining satellites. Future developments India's Department of their 12th Five Year (FYP) (2012–17) stated the of in constellation from to 11 to extend coverage. These additional four satellites will be during 12th FYP and will be launched in the beginning FYP geosynchronous orbit of inclination. Also, the development space-qualified made atomic clocks was with study for all atomic clock (ultra stable IRNSS and deep space communication). IRNSS-1K, IRNSS-1L, IRNSS-1M and spacecrafts in development. Global Indian Navigational System (GINS) and analysis for Global Indian Navigational System was initiated as part of the technology and policy initiatives in the
 located in geostationary orbIt (GEO) and foUr in iNclIneD gEosyNchrOnous orbit (IGSO). aLl saTellites launched or propOsed fOr THe sySTeM are aS followS:

clOCK faIlUrE 
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, 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.  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.

fUtURe developments
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 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).

irNsS-1J, iRnSS-1K, IRNSS-1L, irnSS-1m and IrNsS-1N aRe next bAtch of spacecrafts iN DevElopment.

GlobaL InDian nAViGatIOnAL SyStEM (GIns) 
study and analysiS for Global inDIaN NavigatioNAl SYsTem (GINS) Was initIated AS part of The technoLogy and poLiCy inITIatIves in the 12
 located in geostationaryorbit (GEO ) and  fo urin  inc line d geosynchrono u s or bit (IGSO). All satell itesla u nche d  o r pro posed f o rt h e s ys te m a re as  foll ows :

Cloc k failure
In  2 017, it wasa nn ounced tha t a ll three Spe ctr aTimesu ppl i ed ru bid ium a tomicc lockson boardIR N SS-1Ah ad fail e d ,mirr oring similar fai l ur e s in the Europ ean Un io n 's G ali leo  constella ti on. T h e first fa i l u reo ccurred in, f ollowed soo n  af ter by  t het wo oth er cl oc k s o n IRNSS-1A.  Thi s rendere d thes atellit e  non-fu nction aland  req u ir ed  re pl a cem e nt . I S ROreported  i thad r epla c e d theato micclock s in the twosta ndby sat ellit es, I RNSS -1 H and  IRNSS -1I.,  i n June 2017 The  sub sequent l aun ch  of  I RNSS- 1 H, asa r epl acement  for IR N SS- 1A , w as  unsuccessful when  P S L V- C39 miss ion fa i le do n.  These con d st a n dby s atel l it e, IRNSS -1I, w a ssu ccessfu ll y plac ed  in toorbit on 1 2 Apri l 2018.
In J u ly 2017, it wa s  reported tha t  t w o  m o re c loc ks in the n avig a tion al s y st emh ad al so st ar t ed showing signs of ab no rmalit y, th ereby takingthe totaln u m ber of f aile d  c l ocks to five,in Ma y 2018 a f a ilure of  a fu rther 4clocks wa s reported , t aki ngthe c ou nt to 9 of th e 24 i norbit.

A s a pre cau tio n t o e xt end the o peration al  l if eofnavig a tion sat el lit e,  IS RO is runnin g onl y on eru b idi um atom i cc l ockin st eadoftw o inther ema ining satellite s.Futu re  d evelopm ents
India'sDe partment o fSpa ce int h eir 12th  Five Year Plan (FYP) ( 2 012–17)  st atedincr easing th e n umberofs atelli tes in  theco nst e l latio n fr om7to 11 to e x t end  cove ra ge.These a dditional four sat e lli tes will be m ade  dur i n g12t h  F Y P a nd wil l be launched inthe beginn in g  o f 13th FYP inge osynchr onous o rbito f 42° i nclinatio n. Also,th e de v e lop ment of sp ace-qual ified Ind i an ma d eatomi c c lockswa s i nitia ted, a l ong  with  a stu dy  and d evelo pm ent init iative for an all optic al ato mic c loc k (ultrasta b lefor IRNSS  and  deep spac e c omm unica tio n ).

I RNSS - 1J , I R NSS-1 K, I R NSS-1L, I R NS S-1 M an d IRNSS-1Na r e  ne xt ba tch of spa cecr afts in developme n t.

Global Ind ianN a vig ati o nalSy stem (GINS) 
S tud ya n d analys is  for Global  IndianNa v igati onal S ystem(GINS)w a si nitiat ed a s p art of th e t ec h nologyan dp olicyinit ia tivesin the 12
 located_in geostationary_orbit (GEO) and four_in inclined_geosynchronous_orbit (IGSO)._All_satellites launched or_proposed for the_system are as follows:

Clock_failure 
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,_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.  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.

Future developments
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_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).

IRNSS-1J,_IRNSS-1K, IRNSS-1L, IRNSS-1M and IRNSS-1N are next_batch_of spacecrafts in development.

Global Indian Navigational_System_(GINS) 
Study and analysis for Global_Indian_Navigational_System (GINS) was initiated as_part of the technology and policy_initiatives in the 12