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ARGOS PERFORMANCE IN THE EUROPEAN REGION

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

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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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