International Space Security Conference

Indian SATNAV Programme – GAGAN & IRNSS

Presentationby

Dr.Suresh V.KibeProgramme Director, SATNAVISRO Headquarters, Bangalore

at

Institute for Defence Studies and AnalysisNew Delhi – 110 010

November 13-14, 2007

Indian Satellite Navigation Programme

• ISRO and AAI to implement GAGAN by 2009.• Implement IRNSS – an independent 7 satellite

constellation built and operated by India with indigenous capability

• Cooperate with other international systems such as, GPS, GLONASS and Galileo.

• Keep track of development of other regional systems such as, BEIDOU and COMPASS by China, Regional augmentations to GPS such as, WAAS, EGNOS, MSAS, Nigcomsat etc.

• Maintain interoperability between GAGAN and other regional augmentations to GPS for global navigation

• Maintain synergy between augmentation systems and IRNSS in terms of user receivers

• Develop indigenous capability in user receivers and terrestrial infrastructure

GAGAN and its performance

GPS Augmentation systems in the World

EGNOSWAAS MSAS

2004 2005 ?2009

GAGAN

GAGAN Ground Segment Concept

GEO Ranging+Integrity message+WAD correction

8 INRESs

GPS

INLUS 2INLUS 1

L2

GEO GEO

L1L2

L1,L5

GEO

L1, L5

(GPS)

L1/L5(GEO)

GEOC1 GEO

C2

C1C2

L1

INMCC

L

GPS

L1

Delhi

Ahemdabad

Thiruvananthapuram

Bangalore

Kolkata

Guwahati

Port Blair

INDIAN REFERENCE STATIONSDelhiAhemdabadBangaloreThiruvananthapuramKolkataGuwahatiPort Blair

INRESs

Future INRESsIndoreBhujAmritsarChennai

Nagpur

Bhuj

Indore

Amritsar

ChennaiNagpurLucknow

Lucknow

Visakhapatnam

Jammu

Jammu

INRESs

Visakhapatnam

Kullu

Jodhpur

Ahemedabad

Agatti

Mumbai

Thiruvananthapuram

Bangalore

Hyderabad

Bhopal

Delhi

Lucknow

Raipur

Visakhapatnam

Chennai

Bagdogra

Kolkata

DibrugarhGuwahati

Aizwal

Port Blair

SATNAV TDS Project

Stations planned for TEC Modelling

72o E1. Agatti2. Mumbai3. Ahmedabad4. Jodhpur77o E5. Thiruvananthapuram6. Bangalore7. Hyderabad8. Bhopal9. Delhi10. Kulu82o E11. Visakhapatnam12. Raipur13. Lucknow14. Chennai88o E15. Bagdogra16. Kolkata93o E

17. Guwahati18. Dibrugarh19. Port Blair20. Aizwal

Planned TEC Stations

COVERAGE FROM 82 Deg.E

•

FSAT completed with GAGAN-TDS configuration (13-14 Aug 2007)

Jammu

Ahamedabad

Delhi

Guwahati

Calcutta

Triuandrum

Port Blair

Bangalore

AR = Access RouterCR = Core Router-DCN circuit linesFES = Fast Ethernet Switch

AR #1

INRES

CR #1FES#1

INMCC

AR #1

INRES

AR #1

INRES

AR #1

INRES

AR #1

INRES

AR #1

INRES

AR #1

INRES

AR #1

INRES

AR #1

INLUS

Jammu

Ahamedabad

Delhi

Guwahati

Calcutta

Triuandrum

Port Blair

Bangalore

AR = Access RouterCR = Core Router-DCN circuit linesFES = Fast Ethernet Switch

AR #1

INRES

AR #1

INRES

CR #1CR #1FES#1

INMCC

AR #1

INRES

AR #1

INRES

AR #1

INRES

AR #1

INRES

AR #1

INRES

AR #1

INRES

AR #1

INRES

AR #1

INRES

AR #1

INRES

AR #1

INRES

AR #1

INRES

AR #1

INRES

AR #1

INRES

AR #1

INRES

AR #1

INLUS

AR #1

INLUS

Ground Segment• 8 INRES: 2 INREEs• 1 INMCC• 1 INLUS• 1 ring of OFC (7

INRES)• 1 VSAT link (GPB)

Space Segment• INMARSAT-4F1

• Accuracy was evaluated within the perimeter of the GAGAN-TDS INRES (GBG, GDP, GCC)

• FSAT performance analysis through RT-GAINS completed

24 HR AVAILABILITY DURING FSAT24 HR AVAILABILITY DURING FSATACCURACY TIMELINE FOR BANGALORE INRES During FSATACCURACY TIMELINE FOR BANGALORE INRES During FSAT

FSAT RESULTS FSAT RESULTS (contd.,)

BANGALORE (INREEBANGALORE (INREE--A)A) BANGALORE (INREEBANGALORE (INREE--B)B)

SBAS Position Error Date:13/08/2007,17:05 hrsPlace: NRSA Hyderabad using 532C Patch Ant

-10

-8

-6

-4

-2

0

2

4

6

8

10

128000 129000 130000 131000 132000 133000 134000 135000 136000

Time in GPS sec

Posi

tion

Erro

r in

mtr

s

Lat

Lon

Hight

Effect of SBAS Corrections Vs GPS standalone

GGTGGTAA

GPS Antenna SBAS Antenna∆x = 0.678m∆y = 2.095m∆z =0.206m

HPL HY-BG on 170907

0

2

4

6

8

10

12

14

16

18

23000 24000 25000 26000 27000 28000 29000 30000

Time : UTC_Seconds

HPL

In M

eter

s

HPL

HPL computed for the flight path and HPL contour for the same duration from INMCC on17thSep.

Flight Path from Hyderabad to Bangalore on 17th Sep 07

Accuracy Timeline – GBG-A(Performance Criteria)

24 Hour Availability

FREE FLIGHT REQUIREMENTS

BETTER COMMUNICATION, NAVIGATION AND SURVEILLANCE & UNIVERSALLY ACCEPTABLE WORLD GEODETIC-COORDINATE SYSTEM

NOW FREE FLIGHT

COMMUNICATIONS HF/HF LINKS DIGITAL VHF (VOICE + DATA)(VOICE) SATCOM (VOICE + DATA)

NAVIGATION NDB,VOR,DME, WADGPSILS, MLS LAASINS GPS MAP

SURVEILLANCE PRIMARY/SECONDARY AUTOMATIC DEPENDENTSURVEILLANCE SURVEILLANCE (ADS)RADARS (SATELLITE BASED)

TCAS BETTER TCAS

CONCLUSIONSUSE OF SATELLITES IN ‘FREE FLIGHT’ IS A MUST FOR CNSADS: AIRCRAFT AUTOMATICALLY TRANSMITS, VIA A DATA LINK, FOUR DIMENSIONAL POSITION DATA DERIVED FROM ON-BOARD NAVIGATION SYSTEM. SATELLITE BASED ADS MEANS USE OF SATELLITES FOR POSITIONDETERMINATION & DATA LINKS.

PRESENT10 Mins.

2000 feet

FUTURE WITH ADS-B

IRNSS

Indian Regional Navigation Satellite System

• IRNSS is planned to be an independent regional navigation system covering an area of about 1500kms around India.• IRNSS can provide dependable and accurate services for Critical National Applications.• Extensive simulations indicate that with 7 satellites and a commensurate ground segment, an Indian system can be developed. • Will provide 20 m accuracy over the Indian Ocean Region and <10 m accuracy over India and adjacent countries.

GSO830

111.50

GEO340 1320

0

550

Communication System Downlink Details for IRNSSSl.No Description S-Band L-Band1 Satellite Rx Beam +400 to -400 Lat

400 E to 1400 E Long+400 to -400 Lat400 E to 1400 E Long

2 Sat.Rx Antenna Gain (dBi) Peak/EOC: 20.6/17.6 18.51/15.83 Sat.Tx Antenna Service area India and a region area 1500 km

surrounding Indian Territory4 Sat.Tx Antenna EIRP (dBW) Peak/EOC:35.1/32.1 33.51 / 30.85 Carrier Frequency (MHz) 2483.5 -2500 1179-1203

8 Polarization RHCP RHCP

9 Modulation parameters : Scheme / Symbol rateInformation Rate/FEC

QPSK,CDMA/2 x50 BPS / 1/2

QPSK,CDMA2 x50 BPS / 1/2

7 Carrier Frequency (MHz) 2491.75 MHz 1191 MHz

10 Location of D/L E/S NameLat/Long

Kundalhalli,Bangalore12 58 7.74N / 77 42 50.6E

Kundalhalli,Bangalore12 58 7.74N / 77 42 50.6E

Int’l Committee on GNSS (ICG) Responsibilities

(a) benefit users of GNSS services through consultations among members of the committee;(b) encourage coordination among providers of GNSS core systems and augmentations in order to ensure greater compatibility and inter-operability;(c) encourage and promote the introduction and utilization of satellite positioning, navigation and timing services particularly in the developing countries through assistance with the integration of GNSS services into their infrastructures;(d) Assist both the members of the Committee and international user community (e) Better address future user needs in the GNSS development plans and applications; and(f) Periodically report its activities to the UN COPOUS

Iono-Tropo Model over the Indian Atmosphere