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International Telemetry Consortium

International Telemetry Consortium. Effects of Diminishing Spectrum Resources on Aeronautical Telemetry Jim Rizzo Greg Strombo AFFTC/ITC Edwards AFB CA, 93534 25 October, 2001. WRC-92 2310 – 2360 MHz 2320 – 2345  Digital Audio Broadcast Affect began Summer 2000

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International Telemetry Consortium

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  1. International Telemetry Consortium Effects of Diminishing Spectrum Resources on Aeronautical Telemetry Jim Rizzo Greg Strombo AFFTC/ITC Edwards AFB CA, 93534 25 October, 2001

  2. WRC-92 2310 – 2360 MHz 2320 – 2345  Digital Audio Broadcast Affect began Summer 2000 Sirius Satellites First XM Followed 2 months later 1 Validated report of interference from Sirius 2310 – 2320 & 2345 – 2360 Still not occupied BBA-97 2385 – 2390 Still not occupied Exasperating problems with DAB re-allocation DAB Issues

  3. Formed ad hoc group in Aug 00 RCC TG and FMG Members Discussed ramifications of DAB/TM Presentation by Gene Law of technical ramifications Wrote policy letter: Strongly Urging all member ranges to cease operations in 2320-2345 MHz Initial Response to DAB

  4. Predicted InterferenceTelemetry vs. DAB Rcvr

  5. Mission Profile Changes Aircraft are routinely placed into standby and has resulted in lost missions Aircraft often operate outside of normal working hours and on weekends Note: Activity was specifically excluded from this analysis to better enable comparison to predicted telemetry utilization levels Limitations on preflight ground testing Limitations on Area of Operations Immediate Effects of Reduced Spectrum

  6. AFFTC Operations 410th FLTS 411th FLTS 416th FLTS 418th FLTS 419th FLTS 452nd FLTS Test Pilot School Significant Activities Contractors Lockheed Boeing Northrop Phillips Laboratory Miscellaneous Missiles Special Scheduling NASA Ops (DFRC) Telemetry Consumers at Edwards AFB

  7. Spectrum Resources for Availability Analysis

  8. TM Utilization atEdwards AFB

  9. TM Utilization atEdwards AFB

  10. Delay of aircraft deliveries reduced spectrum consumption rates Extended aircraft modifications Unanticipated new systems Cancellation of projects Result; Train Wreck Delayed approximately 18 Months Projected Utilization Discrepancies

  11. Use Provides Actual Amount of Unoccupied Spectrum Determines Efficiency of Spectrum Reuse Availability Characterizes Band Fragmentation Projects Availability of Unoccupied Spectrum Probability that Standard mission types could schedule telemetry on short notice or reschedule after mission slips Effectiveness of Automated Tools being Integrated into IFDS Phase III Software Development Telemetry Spectrum Metrics

  12. Geographic Separation Line-of-Sight Analysis Propagation Analysis Direction to Receiver Analysis Operational Constraints Restriction on pre-flight TM checks Radio Frequency “Hats” Temporal Techniques 15 min Time Increments for Scheduling Evening and Weekend Missions Increasing Spectrum Availability

  13. Spectrum Monitoring Provides Actual Spectrum Utilization Early Identification of Rogue Emitters Interference Resolution Reduction of Spectrum Piracy Increasing Spectrum Availability

  14. Presence of DAB has increased number of “Lost Missions” Worst Has Yet to Come Current Mitigation Efforts Mission Profile Adjustments Implementation of IFDS Phase III Development of IFDS Metrics Greater Monitoring of Spectrum Summary

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