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ENHANCING ARGOS TRANSMISSION PERFORMANCE DBCP XVII Technical Workshop

ENHANCING ARGOS TRANSMISSION PERFORMANCE DBCP XVII Technical Workshop. Bill Woodward, SAI Christian Ortega, CLS. ARGOS IS FULLY OPERATIONAL WITH SECOND GENERATION INSTRUMENTS ON NOAA-15(K) and NOAA-16(L):. ARGOS SYSTEM GENERATIONS. 400 bits per second 4 channels -128 dBm

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ENHANCING ARGOS TRANSMISSION PERFORMANCE DBCP XVII Technical Workshop

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  1. ENHANCING ARGOS TRANSMISSION PERFORMANCE DBCP XVII Technical Workshop Bill Woodward, SAI Christian Ortega, CLS

  2. ARGOS IS FULLY OPERATIONAL WITH SECOND GENERATION INSTRUMENTS ON NOAA-15(K) and NOAA-16(L):

  3. ARGOS 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

  4. 600 Total number of PTTs : 10043 500 400 300 Number of active PTT 200 100 0 -30 -20 -10 0 10 20 30 Frequency (kHz) ARGOS TRANSMISSION FREQUENCY DISTRIBUTION

  5. INCREASED BANDWIDTH BENEFIT EXAMPLE 1: WATT 256 BITS

  6. INCREASED BANDWIDTH BENEFIT EXAMPLE 2: 250 MW 32 BITS

  7. SOME CONCLUSIONS • Freq. Shifting = Better BER for high power, long message PTTs • Freq. Shifting = Better BER for low power, short message PTTs • Freq. Shifting = More messages (more correct Ids, less competition) • Even a 5 kHz shift is beneficial (Argos 1)

  8. MULTI-SATELLITE SERVICE

  9. PERCENTAGE OF GOOD MESSAGES (256 bits)

  10. TEST RESULTS OF FREQUENCY SHIFTING

  11. TO SUM UP • Since February 2001, the system is fully operational with two Argos 2 instruments. Two more will be launched in early 2002. • Measurements will continue to be performed. • We encourage users to use the full bandwidth of the system • We are also ready to test prototypes with manufacturers.

  12. Simulation Tool: A Case Study for the ARGO Program • ARGO requirements • Argos answer & the Simulation Tool • Application to ARGO case study • Conclusion

  13. Argo Float Mission Schematic

  14. ARGO Requirements • Minimize surface time • Target: <30 mn • Reduce Power Consumption • Target: power cons./10 • Increase data rate • Target: 2kbytes per surfacing

  15. Argos Uplink: Designed for Harsh Environments Platform repeats messages to ensure their reception by satellite

  16. Increasing Data Bandwidth Kbits per sat pass Repetition period 90 s 60s 60 s 90 s

  17. Argos Answer to Argo Requirements Enhance the Argos one-way bandwidth performance • Work on repetition rate, frequency channeling to reduce surface time and power consumption Use Argos Downlink to allow: • Rendez-vous with Satellite (surface time) • Ephemeris broadcasting • Transmit only when Satellite is above (power) • Prediction of Satellite pass time and duration • Transfer of More Data (more samples) • Reducing redundant Tx: Interactive data collection • NEED FOR SIMULATION TOOL

  18. Platform Parameters

  19. Simulation Parameters

  20. TransmissionOptions

  21. Results

  22. Excel output

  23. Defining Max # msgs versus Surface Time and Tr

  24. Conclusion • Addressing new demanding applications requires a higher level of expertise on the Argos System, • To keep the system Simple, we plan to help Users and Manufacturers to define Best Transmission Strategies • Comprehensive Simulation Tools are being developed • So… Just ask!

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