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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