The document discusses the Indian Regional Navigational Satellite System (IRNSS). It provides details about: 1. IRNSS is India's independent regional satellite navigation system consisting of 7 satellites and ground stations to provide positioning services over India and surrounding areas with 20m accuracy. 2. The system architecture includes space, ground, and user segments. The space segment consists of 7 satellites in geostationary and geosynchronous orbits. The ground segment includes ranging and monitoring stations, a navigation control center, and telecommand stations. 3. IRNSS will provide positioning, navigation, and timing services to users through receivers utilizing L5, S-band, and CDMA signals from the satellites.

1. Indian Regional
Navigational Satellite
system(IRNSS)
Presented by
K J Sree Bhargava
1st B.Tech.ECE student
Gudlavalleru engineering college
Gudlavalleru

2. Basic Positioning: Today
 Navigation satellites are Earth Satellites.
 Follow Kepler’s laws of motion, transmit their Position,
Navigation, Time (PNT).
 Provide PNT service through hand-held receivers to users.
 Satellites’ orbits and health monitored through an elaborate
ground segment.
10-20 m

3. All Global Systems have more than 24 satellites each in 19000 – 24000 km altitude orbits. All
transmissions from the satellite to date are in L-band.
The satellites transmit the ephemeris, clock and ionospheric data. The details of the signal
structure and data structure vary slightly.
User receivers measure their distance from at least 4 satellites through one-way ranging
technique. Most downlink signals use Code Division Multiple Access (CDMA) and RF
modulation such as, BPSK, Binary Offset Carrier (BOC) etc. GLONASS uses CDMA ranging
codes with Frequency Division Multiple Access (FDMA)
These constellations represent a wonderful laboratory for fundamental scientific work
GPS GLONASS GALILEO
Global Satellite Navigation
Systems

4. Spectrum for GNSS
GNSS spectral bands are:
 L1 (1559 – 1610 MHz),
 L2 (1215 – 1300 MHz),
 L5 (1164 – 1215 MHz),
 S-band (2483.5 – 2500 MHz)
L1 and L2 bands are being used for 30 years now.
L5 is the latest and much sought after band.
S-band is for Regional use in Region 3. The World Radio
Conference (WRC-12) will discuss global allocation for this
band.

5. GPS GPSGPS
GALILEO GLONASS GLONASS
1164.000MHz
1188.000MHz
1212.000MHz
1215.000MHz
1215.600MHz
1260.000MHz
1237.827MHz
1239.600MHz
1261.610MHz
GALILEO
1300.000MHz
1559.000MHz
1592.952MHz
1610.000MHz
1620.610MHz
1626.500MHz
1587.420MHz
1563.420MHz
GALILEO
5010.000MHz
5030.000MHz
Radioastronomy
1610.6 – 1613.6 MHz
L5 L2 S
E5
2483.5-2500MHz
L1 C
Spectral bands for Radio Navigation Satellite Systems

6. IRNSS
•IRNSS is an independent regional navigation system.
•7 satellite constellation and ground segment.
•Coverage area is about 1500 km beyond Indian territory.
•Estimated horizontal position accuracy of 20m in over India and adjoining areas.

7. IRNSS Objectives
Reliable Position, Navigation and Timing services over India and
its neighborhood
•To provide fairly good accuracy to the user.
•Most of the constellation is seen by user all the time.
•Ionosphere correction messages to user.

8. GAGAN is a Satellite Based Augmentation
System being implemented by India based on
GPS
GAGAN jointly implemented by ISRO and
Airports Authority of India (AAI)
GAGAN implementation in two phases
GAGAN – TDS (Technology Demonstration
System)
GAGAN – FOP (Final Operation Phase)
GAGAN
GPS Aided GEO Augmented
Navigation

9. • To provide Satellite-based Navigation services with
accuracy and integrity required for civil aviation
applications over Indian Air Space.
• Better Air Traffic Management over Indian Airspace.
GAGAN Objective

10. SPACE SEGMENT
Three GEO Satellites
• Two operational Navigation Payloads
• One in-orbit spare Navigation Payload
GROUND SEGMENT
• Indian Master Control Centre (INMCC)
• Indian Navigation Land Uplink Station (INLUS)
• Indian Reference Stations (INRES)
• Communication links
GAGAN CONFIGURATION
INRESs
INMCC
GPS
GPS
INRESs
GEO
INLUS
User
(Navigation
Payload)

11. GAGAN CONFIGURATION

12. IRNSS Elements
 Space Segment
 Ground Segment
 User Segment

13. Configuration

14. IRNSS User Segment
 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 authorized users

15. IRNSS User segment(cont.)
 The user segment consists of a specially designed dual
frequency receiver.
 Several types of receivers are planned with single and dual
frequency reception. Single frequency receivers may be
provided with capability to receive ionospheric corrections.
 The user receiver may receive other constellations in
addition to IRNSS.
 All the seven IRNSS satellites will be continuously tracked by
the user receiver.
 The user receiver will have minimum G/T of -27 dB/K similar
to GPS user receiver.

16. 16
IRNWT
IRNSS- GROUND SEGMENT
Architecture
IRIMS
1
IRIMS
16
…..
IRNSS
Laser Ranging
(IRLSF)
Satellite
Control Facility
Bhopal
6 9
IRTTCSCC
IRNSS Navigation Centre
Bangalore
Satellite
Control Facility
Hassan
1 5
IRTTCSCC
IRNSS
CDMA Ranging
4
(IRCDR)
IRCDR
IRNSS
CDMA Ranging
1
(IRCDR)
IRCDR
Backup INC
IRMNC Computer
IRDCN IRIMS

17. Ground Segment
IRNSS Ranging & Integrity Monitoring stations (IRIM)
 Receive the data from the GEOs and GSOs.
 Transmit the data to Navigation Control Centre.
 Facilitate One way ranging of the GEOs & GSOs.
IRNSS Navigation Control Center(INC)
 Estimate and predict Ephemeris „
 Calculate corrections for SV Clock & Maintain IRNSS time
 Determine ionospheric corrections and integrity
 Transmit the Clock and Ephemeris Corrections to the TTC Stations
for Uplinking to the Satellites

18. Ground Segment(cont.)
 Space Craft control Centre(S C C):
*Manage and maintain the satellite constellation
 IRNSS Telemetry and Command stations:
*Receiving Telemetry from the IRNSS constellation
*Tele command the IRNSS constellation
*Uplinking Navigation updates
 CDMA Ranging Stations:
*Facilitate accurate ranging of IRNSS satellite and send the
data to the Navigation Control Centre

19. Space segment
 Space Segment consists of Seven satellites
 3 Satellites in Geo-Stationary orbit at 34°, 83° and 132° East.
 4 Satellites in GEO Synchronous orbit placed at inclination of 29° with
Longitude crossing at 55° and 111° East.
 The Satellites are specially configured for the Navigation
 IRNSS Satellites are to be launched by the Indian launcher PSLV.
 Space segment will be augmented with 4 more satellites to make 11
satellite constellation with better coverage and accuracy

20. IRNSS SPACE SEGMENT

21. PAYLOAD CHARACTERISTICS
RHCPRHCPTransmit polarization6.
50 KgTotal Payload weight10.
40W40WRF Power rating9.
15.8 dB15.8 dBAntenna Gain8.
HelixHelixType of Antenna7.
C-bandC-bandFeeder Link frequency5.
GlobalGlobalFootprint4.
240WPower D C11.
24 MHz20 MHzBandwidth3.
-2 dB/deg.K-2 dB/deg.KReceive G/T2.
29.2 dBW30.2 dBWTransmit EIRP (EOC)1.
L5 Freq.
(1176.45 MHz)
L1 Freq.
(1575.42 MHz)
System characteristicsSl.
No.

22. IRNSS NAVIGATION SIGNALS
SPS RS
L5 (1176.45
MHz )
BPSK BOC (5,2)
S band
(2492.028
MHz)
BPSK BOC(5,2)
CDMA Ranging Frequencies
•Uplink : 6712 .0MHz (B.W 24MHz)
•Downlink : 3412 .0 MHz (B.W 24MHz)
22

23. IRNSS NAVIGATION SIGNALS

24. Applications of Satellite Navigation systems
Break down of turnover
Personal Mobility
Mass Market Vehicles
Commercial Vehicles
Aviation
Maritime
Emergency Services
Survey
Others

26. THANK YOU