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ARGOS 3 – THE NEXT GENERATION

ARGOS 3 – THE NEXT GENERATION. Bill Woodward – SAI. TODAY’S PRESENTATION. SYSTEM FEATURES AND CAPABILITIES. HOW THEY CAN BE APPLIED - Examples. LAUNCH SCHEDULE & PLANNED CONSTELLATION. FUTURE (ARGOS 4). 55%. Argos provides communications for all systems with the. ARGOS 2. NOAA 16.

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ARGOS 3 – THE NEXT GENERATION

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  1. ARGOS 3 – THE NEXT GENERATION Bill Woodward – SAI

  2. TODAY’S PRESENTATION • SYSTEM FEATURES AND CAPABILITIES • HOW THEY CAN BE APPLIED - Examples • LAUNCH SCHEDULE & PLANNED CONSTELLATION • FUTURE (ARGOS 4)

  3. 55% Argos provides communications for all systems with the

  4. ARGOS 2 NOAA 16 NOAA 15 NOAA 17 (1998) (2000) (2002) ARGOS 2 ARGOS 1 NOAA 18 (2005) NOAA 14 (1994) ARGOS 3 NOAA 12 (1991) METOP A (April 2006) TODAY’S ARGOS SPACE SEGMENT

  5. ARGOS SYSTEM EVOLUTION • RANDOM ACCESS SYSTEM: ARGOS 1 & 2 • No Ground to Sky Protocol • Improve Good Receipt by repeat transmissions (same msg sent multiple times) • DIFFERENT WITH ARGOS 3 • Error-free msg Receipt is acknowledged • Repeat Transmissions are minimized/eliminated • Order of Magnitude Higher Data Rate: 4,800 bits/sec • RESULT = MORE MSGS (DATA per PASS)

  6. SYSTEM GENERATIONS 400 bits per second 4 channels -128 dBm 20 kHz receiver bandwidth ARGOS 1 400 bits per second 8 channels -131 dBm 80 kHz receiver bandwidth ARGOS 2 400 & 4800 bits per second 12 channels -137 dBm 110 kHz receiver bandwidth 2- way communication ARGOS 3

  7. ARGOS 3 FEATURES • HIGH DATA (HD) RATE CHANNEL - 4,800 BITS/SEC • TWO-WAY CAPABILITY –Send Msgs and ACK • HIGHER RCVR SENSITIVITY – MINUS 137dBm • WIDER SPECTRUM: +30 KHz FOR HIGH DATA RATE • 12 PROCESSING UNITS • NEW TRANSMITTER MODULATION

  8. The ARGOS-3 System • UPLINK : 3 transmission protocols @ 401 MHz • Standard : 400 bps, basic Argos ServiceSTD Argos-1, 2 and 3 • High Sensitivity : 400 bps, very low powerNG additional 5 dB margin • High Data Rate : 4.8 kbps, 5 WattHD up to 50 kbits per pass

  9. The ARGOS-3 System • DOWNLINK :transmit messages @ 466 MHz of variable length (~ 200 bits max) to the Platforms fitted with appropriate receivers

  10. The ARGOS-3 Receiving Spectrum STD ARGOS 1 401.638 MHz 401.662 MHz 24 kHz STD ARGOS 2 401.580 MHz 401.610 MHz 401.690 MHz HD STD + NG ARGOS 3 30 kHz 80 kHz

  11. The ARGOS-3 Downlink • Beacon equipped with a receiver = PMT (466 MHz, 400 bps, half or full duplex) • Main functionalities : • Acknowledgement of uplink messages • Transmission of user defined PMT instructions (can selectively address one or more PMT’s) • « Allcast » msgs (Time broadcasting, orbital parameters….) • Transmission of pre-defined msgs (On, off, PMT location….)

  12. The ARGOS-3 PMT • NEW LINK BETWEEN SENSORS & USERS • PLATFORM MESSAGING TRANSCEIVER - UPLINK MESSAGES w/SELECTED MODULATION - RECEIVE DOWNLINK MESSAGES - COMMUNICATE w/PLATFORM; DELIVER ACK • NEW ARGOS PERFORMANCE TO USERS

  13. CLS PMT PROJECT: 2 MAIN TARGETS • FIRST GENERATION PMT “MODULAR” • SECOND GENERATION PMT “SINGLE BOARD”

  14. 80 FIRST GEN UNITS: PMT A2/HD – to be built by Seimac, Ltd • “ALMOST” EXACT COPIES OF PROTOTYPES BUILT BY BATHY SYSTEMS - Modular • IMPROVEMENTS INCLUDE: • New Digital Xmtr for both BPSK & GMSK • New Packaging - smaller size • FIRST 10 UNITS TO BE DELIVERED – DEC. ‘05

  15. SECOND GENERATION PMT • CORRESPOND FUNCTIONALLY TO DEMO UNITS BUT DESIGNED FROM “SCRATCH” • SINGLE BOARD REDUCES SIZE, COST, COMPLEXITY AND POWER CONSUMPTION • BENEFIT FROM EXISTING KNOWLEDGE & EXPERIENCE OF COSPAS/SARSAT MANUFACTURERS

  16. CASE STUDY - ARGO THREE PRINCIPAL REQUIREMENTS • Transmit More Data Faster • Shorter Surface Time • Survive Longer/Use Less Power

  17. CASE STUDY - ARGO APPLYING ARGOS 3 FEATURES • PROFILING FLOAT • Surface Time Decrease: 10+ Hours 10 minutes • Float Lifetime Extended: Xmit Only During Sat. Pass and use Lower Power XMTR • Send Complete 70 Level Profile in One Argos Message! • Send 800 Level Profile in One Satellite Pass! • Adaptive control using 2-way

  18. CASE STUDY - ARGO EXAMPLE – APEX (Webb Research) • Current “Typical” Transmission Strategy using Argos 2 • 5 Data Triplets (P,T,S) = 240 Bits • 15 Msgs are Req’d to Code a Profile of 75 Levels: (3.7 kbits) • Each Msg is Sent 5+ Times at a 45-60 sec. Rep. Rate • Required Surface Time is 10+ Hours

  19. CASE STUDY - ARGO APPLY ARGOS 3 HD +ACK STRATEGY • Xmit Only When Satellite is in View – Rendezvous • Xmit using High Data Rate with Acknowledgement Signal

  20. CASE STUDY - ARGO EXAMPLE 1 – APEX FLOAT • SEND 75 LEVEL PROFILE IN A SINGLE MSG • 75 Data Triplets (P,T,S) = 3,600 Bits • Only 1 Msg is Req’d to Code a Profile of 75 Levels • Msg is Sent until ACK is Received • Can use a 60 sec. Rep. Rate, and send 10 msgs in a 10 min Sat Pass

  21. CASE STUDY - ARGO EXAMPLE 2 – APEX FLOAT • SEND 800 LEVEL PROFILE IN ONE PASS • 100 Data Triplets (P,T,S) = 4,800 Bits • 8 Msgs are Req’d to Code a Profile of 800 Levels • Each Msg is Sent until ACK is Received • Can use a 50 sec. (or less) Rep. Rate, and send 11 msgs in a 10 min Sat Pass

  22. ARGOS DATA TRANSFER FOR ARGO + 2-way + 2-way 38 ONE ARGOS 3 MSG Argos 3 Kbits per Sat Pass 27 + 2-way 2 Argos 2 1 80 points 554 points 800 points

  23. APPLYING THE NEW FEATURES • DRIFTER • Drifter Lifetime Extended • XMIT only when triggered • XMIT only when satellite is overhead • Send More/Different Data • Lower Power XMTR – Shift Frequency

  24. LAUNCH SCHEDULE POSSIBLE CNES MICROSAT MEGA-TROPIQUE –EQUATORIAL ORBIT

  25. The future : ARGOS-4 • FOR STANDARD BEACONS : • - Continuity of mission to be ensured : use of current modulations (standard and new generation). • Improvement of the capacity by increasing the band (today 80 kHz → 2 MHz useable in the 401-403 MHz band) and/or the number of processing units. • Improvement of techno, of DSP processing power. • FOR HIGH DATA RATE BEACONS : • Bit rate up to 10 or 20 kbits/s with same EIRP = 5 Watt (use of last modulation and coding techniques : treillis coded modulation or turbo coding for instance) • Capacity enhancement by use of spread spectrum techniques for instance

  26. The future : ARGOS-4 Improvement of the Downlink : Currently, the downlink is limited to one single frequency @ 465.9875 MHz and a bit rate = 400 bps. For Argos-4, due to the uplink capacity improvement and the need of more acknowledgements, the downlink will certainly need to be improved: - by adding other frequency channels - by increasing the data bit rate - by using new modulation and coding techniques

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