The Indian Regional Navigation Satellite System (IRNSS) is India's independent regional navigational satellite system. It consists of 7 satellites in geostationary orbit that provide navigation services to users in India and the surrounding 1500-2000 km region. IRNSS aims to provide accurate position information services to users in India as well as the surrounding region. It is intended to provide two types of services: special position service and precision service.
4. BACKGROUND
Approved by Government of India in May 2006
The total cost of the project is expected to be US$209 million
In April 2010, it was reported that India plans to start launching satellites by the
end of 2011, at a rate of one satellite after every six months
This would have made the IRNSS functional by 2015, but program was delayed
The IRNSS signal has been released for evaluation in Sep 2014
5. OTHER SYSTEMS
• GPS(Global Positioning System)
• GLONASS(Global Navigation Satellite System)
• BeiDou-2
• Galileo
6. Why Launched?
Selective availability of GPS signal made it less effective and
reliable
Access to foreign government-controlled global navigation
satellite systems (GPS) is not guaranteed in hostile situations
Indian military depending on American GPS during Wars
10. SATELLITE GENERATIONS
IRNSS-1A was the first navigational satellite in the IRNSS series of satellites to be
placed in geosynchronous orbit. ( PSLV-C22on 1 July 2013 from the Satish Dhawan
Space Centre at Sriharikota).
13. SPACE SEGMENT
Based on various considerations the minimum number of
satellites required for IRNSS constellation is worked out to
be 7 (3 GEO and 4 GSO).
The 3 GEOs will be located at 32.5º E, 83º E and 131.5º E and
the 4 GSOs have their longitude crossings 55º E and 111.75º
E (two in each plane).
14. GROUND SEGMENT
Ground Segment is responsible for the maintenance and operation of
the IRNSS constellation. The Ground segment comprises of:
ISRO Navigation Centre
IRNSS Spacecraft Control Facility
IRNSS Range and Integrity Monitoring Stations
IRNSS Network Timing Centre
IRNSS CDMA Ranging Stations
Laser Ranging Stations
Data Communication Network
15. USER SEGMENT
The User segment mainly consists of:
Single frequency IRNSS receiver capable of receiving SPS
signal at L5 or S band
frequency
A dual frequency IRNSS receiver capable of receiving both
L5 and S band frequencies.
A receiver compatible to IRNSS and other GNSS signals
16. IRNSS SIGNAL PLAN
The first proposal for the Signal and Frequency Plan presented in Nov 2006
during the First ICG Meeting in Vienna by Indian Space Research Organization
(ISRO).
17.
18. IRNSS COVERAGE
1,500-2,000 km’s around Indian land-mass SAARC countries can use IRNSS
navigation system
SAARC members countries included are
India
Afghanistan
Bangladesh
Bhutan
Maldives
Nepal
Pakistan
Sri Lanka
22. IRNSS PERFORMANCE
Current status with 4 satellites of IRNSS, the GDOP
(Geometric Dilution of Precision varies from 2m to 9m in a day)
which means we are getting accuracy around 8m to 40m.
With 3 more satellites in IRNSS the GDOP variation would be
only 3-4m and hence accuracy will be guaranteed less than
20m throughout day in any part of India
Please note GPS is giving similar accuracy
23. IRNSS PERFORMANCE
IRNSS L5 signal is compatible with GPS new signal structure
of L5c. and hence user may have receiver with both GPS and
IRNSS and get better accuracy by combing solution.
IRNSS broadcast difference between IRNSS and GPS, IRNSS
and GLONASS for compatibility.
26. SERVICES
Special Positioning Service (SPS) an open
service without encryption and Restricted
Service
Precision Service (PS) an authorized with
encryption are the basic services offered by
IRNSS
