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1. NAVIC
NAVigation with Indian Constellation
Presented By:
VELICHETI UDAY KUMAR

2. CONTENTS
 Introduction
 Why launched?
 Other navigation satellite systems
 The beginning
 Architecture
 Satellites
 Navic coverage
 Applications /Benefits
 conclusion

3. Introduction
 The indian regional navigation satellite system or IRNSS
 In April 2016,with the last launch of constellation satellite ,
IRNSS was renamed “NAVIC” by indian prime minister
‘Narendra modi’.
 NAVIC – Navigation with IndianConstellation
 NAVIC means “sailor” or “navigator” in Sanskrit, Hindi and
many other indian languages.
 An autonomous regional satellite navigation system.
 provide accurate real –time positioning and timing services
over India and the region extending to 1500 km (930 miles )
around india .

4. Why launched?
 Access to foreign government controlled
‘Global Navigation SatelliteSystems ‘ is not
guaranteed in hostile situations
 As happened to the Indian Military in 1999
when it was dependent on theAmericanGPS
during the kargil war.

5. Other Navigation satellite system
 USA – Global
positioning system
(GPS)
 RUSSIA –Glonass
 EU-Gallileo
 CHINA – Beiduo(BDS)
 INDIA – NAVIC (IRNSS)

6. The Beginning
 Approved by government of
india in May 2006
 The total cost of the project is
expected to be Rs 1420 crores
 The full system comprises 9
satellites
 3 satellites inGEO orbit
 4 satellites inGSO orbit
 2 on the ground as stand by

7. GEO Vs GSO
.

8. Architecture
 The NAVIC
architecture mainly
consists of
 Space segment
 Ground segment
 User segment

9. Space Segment
o Minimum number of
satellites required for IRNSS
constellation is worked out
to be 7 (3 geo and 4 gso ).
o The 3 geo will be located at
32.5°, 83° and 131.5° East.
and
o the 4 gso have their
longitude crossings 55° east
and 111.75º East (two in
each plane).

10. Ground segment
o Ground segment is responsible for
the maintenance and operation of
the IRNSS constellation.
o The ground segment comprises of
 IRNSS Space Craft Control Centre (SCC)
 IRNSS Navigation Centre (INC)
 IRNSS TTC & Uplinking Stations (IRTTC)
 IRNSS Range and Integrity Monitoring
Stations (IRIMS)
 IRNSS Timing Centre (IRNWT)
 IRNSS CDMA Ranging Stations (IRCDR)
 Laser Ranging Station (ILRS)
 Data Communication Network (IRDCN)

11. User segment
o The user segment consists of
IRNSS receivers operating in
– Single Frequency ( L5 or S band)
– Dual Frequency (L5 and S band)
• Single frequency and dual
frequency receivers shall receive
both SPS and RS signals. SPS is for
civilian users. RS signal is meant
for authorised users.

12. NAVIC navigation signals
BAND SPS RS
L5 (1176.45 MHz) BPSK BOC(5,2)
S band(2492.028 MHz) BPSK BOC(5,2)
 CDMA Ranging frequencies
 up link : 6712.0 MHz(BW 24 MHz)
 Down link : 3412.0 MHz(BW 24 MHz)

13. IRNSS Space Craft

14. Satellites
IRNSS-1A:
 Built at ISRO satellite centre , Bangalore .
 It has a lift mass of 1380 kg and carries a navigation pay load
and c- band ranging transponder, which operate in L5
band(1176.45 MHz)and s band(2492.028)MHz .
IRNSS-1B:
 It was placed in geo synchronous orbit on 4 april 2014 aboard the
PSLV-C24 rocket from sathish dawan space centre , sriharikota.
 The IRNSS -1B satellites weighs 1,432 kg and has two payloads :
navigation payload and cdma ranging payload in addition with a laser
retro-reflector.

15. IRNSS-1C:
 It was placed in GSO on 16 oct 2014 aboard PSLV-C26 from the
sathish dawan space centre,sriharikota
 IRNSS-1C satellite has two payloads :navigation payload and cdma
ranging payload
 The navigation system so developed will be a regional one targeted
towards south asia .
 The both 1B and 1C design of the payload makes
the IRNSS system inter-operable and compatible
with GPS and Galileo. . The satellite will provide
Navigation ,tracking and mapping services

16. IRNSS 1-D:
 It is fourth out of seven in the IRNSS satellite system.
 It was successfully launched using indian PSLV –C27
on 28 march 2015.
IRNSS 1-E:
 It is the fifth IRNSS satellite. it was launched on 20
january 2016 using indian PSLV-C31.
 A highly accurate Rubidium atomic clock is part of
the navigation payload of the satellite
 It carries two types of payloads – navigation and
cdma ranging.

17. IRNSS-1F :
 It is the sixth IRNSS satellite . It was launched on 10 march
2016 using indian PSLV-c32.
IRNSS-1G:
 It is the seventh IRNSS satellite. It was launched on 28
april 2016 using indian PSLV-C33,which conclude the
setting up of the IRNSS.

18. Orbital Location Geosynchronous/
Geostationary
Payload Navigation Payload in S and
L5 bands Ranging Payload in
C Band
Power 1600Watts
Mass Between 1350-1450 Kg
Mission Life 10Years

19. Orbit
IRNSS
spacecraft
Longitude (E) Inclination Launch date
1A 55.0º 29º (±2) July 1, 2013
1B 55.0º 29º (±2) April 4, 2014
1C 83.0º 29º (±2) October 15, 2014
1D 111.75 º 29º (±2) March 27, 2015
1E 111.75 º 29º (±2) January 20, 2016
1F 32.5º ± 5º March 10, 2016
1G 129.5º ± 5º April 28, 2016

20. Clock failure
 In 2017 it was announced that three rubidium atomic
clocks on board IRNSS -1A have all failed .
 This rendors the satellite somewhat redundant and
requires replacement .
 Although the satellite still performs other functions ,the
data will be coarse ,and this cannot be used for accurate
measurement.
 Isro plans to replace it with IRNSS-1H in the second half of
2017.

21. IRNSS Coverage
 1,500-2,000 kms around indian land-
mass SAARC countries can use IRNSS
navigation system.SAARC members
countries included are
 India
Afghanistan
Bangladesh
Bhutan
Maldives
Nepal
Pakistan
Srilanka

22. GPS Vs NAVIC
• More accurate than theAmericanGPS system.
•UnlikeAmericanGPS, Isro is recommending a small
additional hardware in handheld devices that can
receive S-Band signals from IRNSS satellites and
inclusion of a code in the phone software to receive L-
Band signals.
•Both these L and S-band signals received are being
calculated by a special embedded software which
reduces the errors caused by atmospheric disturbances
significantly.This, in turn, gives a superior quality
location accuracy than theAmericanGPS system

23. Satellite view

24. Applications/Benefits
Navigation
- Boats and ships
-Hikers,climbers
-Air navigation
-cyclists
-Automobiles
-heavy equipments
Surveying and mapping
-archeology
-geophysics and geology
-surveying
-mapping and geographic
information systems
Other uses
-military precision
-mobile satellite communications
-GPS tracking
-weather prediction
-socialnetworking

25. Conclusion
 NAVIC (Navigation with Indian Constellation) is an Operational name
of IRNSS.
 Independent Indian Regional Navigation Satellite System
 provide accurate position information service to users in India as well
as the region extending up to 1500 km from its boundary.
 In this Programme there are two levels of service/access to data
1. Standard Positioning Service (SPS)
-which is provided to all the users
2. Restricted Service (RS)
- which is an encrypted service provided only to the authorised users
like Indian Security forces.
• NAVIC has total of 7 satellites of which 3 are in GEO (GeoStationary)
orbit and 4 are in GSO (GeoSynchronous) orbit.

26. ANY QUESTIONS/QUERIES???

27. Thank You!