Presentation is loading. Please wait.

Presentation is loading. Please wait.

Th INSAT SATELLITE BASED DATA COLLECTION & TRACKING SYSTEM FOR OCEAN DATA BUOYS S. N. Satashia, Prem Kumar, M. Jeyamani & Tata Sudhakar Space Application.

Similar presentations


Presentation on theme: "Th INSAT SATELLITE BASED DATA COLLECTION & TRACKING SYSTEM FOR OCEAN DATA BUOYS S. N. Satashia, Prem Kumar, M. Jeyamani & Tata Sudhakar Space Application."— Presentation transcript:

1 th INSAT SATELLITE BASED DATA COLLECTION & TRACKING SYSTEM FOR OCEAN DATA BUOYS S. N. Satashia, Prem Kumar, M. Jeyamani & Tata Sudhakar Space Application Centre Ahmedabad & NIOT Chennai BY Tata Sudhakar National Institute of Ocean Technology, Chennai

2 The system uses Data Relay Transponder(DRT) of the Satellites The satellite receives transmission from data buoy in UHF band(402MHz) and retransmits to ground station in C band(4.5GHz). There are two satellites having DRT transponders INSAT 3A at location 93.5E and METSAT (KALPANA) satellite at location 74E. INSAT BASED DATA COLLECTION SYSTEM

3 INSAT DRT coverage

4 FEATURES OF THE INSAT SATELLITES INSAT 3A C band Transponder:12 Ext C band Transponder:6 Ku band Transponder:6 DRT&SAS&R Transponders:1 Met Transmitter(VHRR&CCD):1 METSAT(KALPANA) DRT & SAS&R Transponder :1 Met Transmitter(VHRR):1

5 PRESENT DCP India Meteorological Department Central Water Commission Snow& Avalanche Establishment NIOT State Agencies

6 Transmit power 10W (Typ.) Transmit at 4.8Kbps in random mode in allotted time window. Uses Directional antenna of gain 11dB (Typ.) Uses 3.8m Ground Receive station (Hub) CHARACTERISTICS OF THE TRANSMITTER (DCP)

7 Rx. Frequency Range: Mhz.  100KHz. Rx. G/T: dB/ K Receive Polarization: Circular(RHCP for METSAT &LHCP for INSAT 3A) Down link frequency: 4505 MHz (Nominal) Transmit Polarization: Linear EIRP (EOC):18dBW DRT TRANSPONDER CHARACTERISTICS

8 Satellite Link Design for Data Buoys The Transmit power from the data buoy is 10W. The transmit data rate is 300bps. Forward Error Correction Coding (convolution Coding) for the satellite channel is employed. Packet Error rate Probability(PEP)is kept as Time Division Multiple Access(TDMA) transmission protocol employed with time synchronized to GPS received time.

9 Satellite Link calculation UP LINK: Up link frequency: MHz. Tx power: 10dBW Antenna gain (including cable loss): -3dBi Tx. EIRP: 7dBW Max. Slant range to satellite (at 5 deg. Ele): Km Uplink path loss: 177 dB Satellite G/T: -19dB/K : EIRP - path loss + G/T+K Uplink C/No: 39.6dBHz DOWN LINK: Down link freq.: 4505Mhz Down link path loss: 197.0dB Satellite EIRP: -1dBW Down link path loss: 197.0db G/T of earth station (3m): 17dB/K Down link C/No : EIRP - Path loss+ G/T+k : 47.6dBHz Total C/No: 39.5dBHz Required C/No: 34dBHz Link Margin: 5.5dB

10 UHF TRANSMITTER (10W) DATA COLLECTION FROM DATA BUOY THROUGH INSAT UHF(402MHz ) Data Acquisition (CPU) GPS Data from Sensors LNA RF D/C BURST DEMOD (BPSK) 70MHz IF300b/s C-BAND(4.5GHz) To data processing system of NIOT 3.8m INSAT

11 Message Generator Frequency Synthesizer (UHF) Power Amplifier (10W) BPSK Modulator Data from CPU Block Schematics of INSAT UHF Transmitter 4.8Kbaud 402MHz 300bbps (1/2 rate)

12 F (8) MID (16) IINFORMATION (320) CRC (16) F (8) DATA FORMAT BURST FORMAT OF TRANSMISSION CRBTRUW 1.68Sec sec UP TO 752 SYMBOLS SCRAMBLED AND ½ RATE CODED CR Carrier Recovery BTR Bit Timing Recovery UW Unique Word

13 Specification of Receive station(HUB) Receive frequency:4505MHz G/T of Receive station (3.8m): 22dB/K IF Input to BPSK demodulator:70MHz (nominal) Output data rate & level: 300b/s, RS 232 Output data frame format (Demod): HDLC Input to data processing unit:4800baud

14 TEST RESULT OF SATELLITE LOOP TX power C/N o (dBHz) Packets % PEP Rx / Tx 1W32.380/ W33.390/ W34.396/100, 95/100, / W36.398/ W41.898/

15 1.THE EXPERIMENT RESULTS SHOW THAT INSAT SUPPORTS DATA BUOY COMMUNICATION WITH ADEQUATE MARGIN 2.OCCASIONAL LOSS OF DATA DUE TO INTERFERENCE FROM OTHER GROUND SYSTEM IS TAKEN CARE OF BY DIFFERENTIAL CODING and REPEAT TRANSMISSION.

16 INSAT Transmitter and Antenna for data buoys

17 INDIA Arabian Sea Bay of Bengal SW6 DS1 DS3 Chennai Machillipatnam Mangalore Tuticorin Goa Mumbai NIOT Pipvav Off Paradip DATA BUOYS WITH INSAT COMMUNICATION Data Buoy with Insat communication Buoy with Insat Position reporting system

18 NIOT Hub and INSAT DRT capacity A hub station has been commissioned at NIOT in association with SAC Ahmedabad to establish the INSAT link for buoy communication. Successfully carried out the preliminary tests INSAT (METSAT & INSAT 3A) can handle communication up to 1200 platform/ hour/carrier.

19 TRACKING SYSTEM

20 Information Rate300 BPS FormatHDLC Message Length40 Characters (Max) Error Protection16 bit CRC Error correction rate 600 BPS ModulationBPSK, bust External DataRS-232 Interface (GPS,NMEA D) Transmission3 Packets/message randomized – Aloha mode. 1 Packet / Message - TDMA mode Transmission time4 sec (Max) / Message Frequency band to MHz Freq. Uncertainty± 2.7 KHz Max. Antenna Coverage± 45° Tx EiRp9 dBW (min.) Power SupplyLi - Ion -12 V DC, 600 mAh, Rechargeable Battery Temperature0 to + 50° C MSS Terminal Specification

21 Buoy fitted with MSS transmitter is ready for deployment. MSS - TRANSMITTER

22

23 Message Generator Frequency Synthesizer Power Amplifier BPSK Modulator GPS Receiver Emergency Switch Battery Block Schematics of Alert Transmitter

24 Thank you


Download ppt "Th INSAT SATELLITE BASED DATA COLLECTION & TRACKING SYSTEM FOR OCEAN DATA BUOYS S. N. Satashia, Prem Kumar, M. Jeyamani & Tata Sudhakar Space Application."

Similar presentations


Ads by Google