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ARGOS PERFORMANCE IN THE EUROPEAN REGION

This study by Woodward, Gros, Ortega, and CLS highlights reduced message reception by Argos users, influenced by transmitted power levels and low-power device limitations in certain regions. Collaborating with CNES, CLS employs satellite-based measurements and analytical tools to optimize transmission strategies and lobby governments for interference elimination. Identifying sources in various countries, the study recommends further noise level measurements, ground-based source location, and diplomatic pressure for system enhancement.

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ARGOS PERFORMANCE IN THE EUROPEAN REGION

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  1. ARGOS PERFORMANCE IN THE EUROPEAN REGION Bill Woodward, Philippe Gros, Christian Ortega CLS

  2. THE “PROBLEM” • ARGOS USERS REPORT REDUCTION IN NUMBER OF MESSAGES RECEIVED • IMPACT IS A FUNCTION OF XMITTED POWER LEVEL • SOME “LOW POWER” PTTs MAY NOT BE HEARD IN CERTAIN REGIONS • ARGO FLOAT “TE” IS REDUCED

  3. THE RESPONSE • SYSTEMATIC INVESTIGATION BY CLS & CNES • TWO INITIAL OBJECTIVES: Estimating the Mean Noise Level Seeking Locations of Discrete Noise Sources

  4. THE APPROACH • TECHNICAL • SATELLITE-BASED MEASUREMENTS • CLOSE CO-OP w/USERs & MANUFACTURERS • ANALYTICAL TOOLS TO ASSIST USERS TO OPTIMIZE THEIR XMIT STRATEGY • ADMINISTRATIVE • INFORMAL & FORMAL REQUESTS BY CNES TO GOVERNMENTS

  5. WHERE WE ARE • SYSTEM OCCUPANCY

  6. NOISE MEASURED BY DORIS: 401.250 MHz

  7. PSEUDO-MESSAGING PROCESSING

  8. DISCRETE ARGOS INTERFERENCE SOURCES HAVE BEEN LOCATED IN THE FOLLOWING COUNTRIES: • Albania AlgeriaItaly SyriaEcuador (2) Russia (2) • INFORMAL REQUESTS HAVE BEEN SENT REQUESTING ELIMINATION OF THIS INTERFERENCE

  9. MINIMUM RECEIVED POWER LEVEL

  10. IMPACT OF THE NOISE FLOOR

  11. PRELIMINARY CONCLUSIONS: • Beacons less than 250 mW may not be received • Beacons more than 500 mW have higher probability of reception

  12. NOW WHAT? • CONTINUE TO MEASURE NOISE LEVELS • IMPLEMENT GROUND BASED MEASUREMENTS TO LOCATE SOURCES OF WIDE-BAND NOISE • MAINTAIN PRESSURE ON COUNTRIES WITH DISCRETE INTERFERENCE SOURCES

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