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.

16

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)

22

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