Indian Regional Navigational Satellite system(IRNSS) Presented by K J Sree Bhargava 1st B.Tech.ECE student Gudlavalleru engineering college Gudlavalleru
Indian Regional Navigational Satellite
system(IRNSS)
Presented by
K J Sree Bhargava 1st B.Tech.ECE student Gudlavalleru engineering
college Gudlavalleru
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
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
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.
GPS GPSGPSGALILEO GLONASS GLONASS
1164
.000
MH
z
1188
.000
MH
z
1212
.000
M
Hz
1215
.000
MH
z
1215
.600
MH
z
1260
.000
MH
z
1237
.827
MH
z12
39.6
00 M
Hz
1261
.610
MH
z
GALILEO
1300
.000
MH
z15
59.0
00 M
Hz
1592
.952
MH
z
1610
.000
MH
z16
20.6
10 M
Hz
1626
.500
MH
z
1587
.420
MH
z
1563
.420
MH
z
GALILEO
5010
.000
MH
z
5030
.000
MH
z
Radioastronomy1610.6 – 1613.6 MHz
L5 L2 SE5
2483
.5 -
2500
MH
z
L1 C
Spectral bands for Radio Navigation Satellite Systems
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.
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.
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)
GAGANGPS Aided GEO Augmented
Navigation
• 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
SPACE SEGMENTThree 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)
GAGAN CONFIGURATION
IRNSS Elements
Space Segment
Ground Segment
User Segment
Configuration
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
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.
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IRNWT
IRNSS- GROUND SEGMENT Architecture
IRIMS1
IRIMS16…..
IRNSS Laser Ranging
(IRLSF)
Satellite Control Facility
Bhopal
6 9
IRTTCSCC
IRNSS Navigation CentreBangalore
Satellite Control Facility
Hassan
1 5
IRTTCSCC
IRNSS CDMA Ranging
4 (IRCDR)
IRCDRIRNSS
CDMA Ranging 1
(IRCDR)
IRCDR
Backup INC
IRMNC Computer
IRDCN IRIMS
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
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
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
IRNSS SPACE SEGMENT
PAYLOAD CHARACTERISTICS
RHCPRHCPTransmit polarization6.
50 Kg Total Payload weight10.40W40WRF Power rating9.15.8 dB15.8 dBAntenna Gain8.
Helix HelixType of Antenna7.
C-bandC-bandFeeder Link frequency 5.
GlobalGlobalFootprint4.
240WPower D C11.
24 MHz20 MHzBandwidth3.-2 dB/deg.K-2 dB/deg.KReceive G/T2.
29.2 dBW
30.2 dBWTransmit EIRP (EOC)1.
L5 Freq. (1176.45 MHz)
L1 Freq. (1575.42 MHz)
System characteristicsSl. No.
IRNSS NAVIGATION SIGNALSSPS 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)
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IRNSS NAVIGATION SIGNALS
Applications of Satellite Navigation systems
Break down of turnover
Personal Mobility
Mass Market Vehicles
Commercial Vehicles
Aviation
Maritime
Emergency Services
Survey
Others
THANK YOU