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Satellite Data-Link Communication Seminar

Satellite Data-Link Communication Seminar. GOLD Data Analysis. 8 February 2012. Contents. GOLD Data Analysis Overview CPDLC message sets / ADS-C downlink reports Performance Measures Examples of Aggregate CPDLC and ADS-C Monthly Performance RCP240 and RSP180 for SAT, VHF

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Satellite Data-Link Communication Seminar

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  1. Satellite Data-Link Communication Seminar GOLD Data Analysis 8 February 2012

  2. Contents • GOLD Data Analysis Overview • CPDLC message sets / ADS-C downlink reports • Performance Measures • Examples of Aggregate CPDLC and ADS-C Monthly Performance • RCP240 and RSP180 for SAT, VHF • RCP400 and RSP400 for HF • Examples of Performance by Specific Factor • Station Identifier • Operator • Operator/Aircraft type/Airframe

  3. GOLD Analysis Overview: CPDLC Message Set • The guidance in the Global Operational Data Link Document (GOLD) specifies the message sets to be considered • All uplink communications transfer messages and typical intervention messages such as climb clearances with an observed CPDLC “WILCO” response attribute are assessed • These messages are considered to be intervention messages critical to the communications used when applying reduced separation standards • Uplink elements containing route clearances (UM79, 80, 83) are removed from message set

  4. GOLD Analysis Overview: CPDLC Performance Measures • Actual Communication Performance (ACP) • Total time required by the communication transaction • Begins when the CPDLC uplink message is sent to aircraft • Ends when the WILCO is received • Actual Communication Technical Performance (ACTP) • Time required for the message delivery part of the communication transaction, includes: • CPDLC clearance uplink transit time • WILCO downlink transit time • Pilot Operational Response Time (PORT) • Time required for crew response • Estimated by ACP - ACTP

  5. GOLD Analysis Overview: CPDLC Performance Measures

  6. GOLD Analysis Overview: ADS-C Messages and Performance Measure • Surveillance Latency • All downlink ADS-C messages are included • Measures transit time for downlink message delivery • Begin time estimated by timestamp of aircraft when sent • End time estimated by timestamp of ATC receipt

  7. GOLD Analysis Overview: Interpreting GOLD Charts In this example: • the observed performance meets the 95% criteria but does not meet the 99.9% criteria, • the latency of 95% of downlink ADS-C messages in data set is within 37 seconds • the latency of 99.9% of downlink ADS-C messages in data set is not within 240 seconds

  8. GOLD Performance Criteria

  9. ExamplesMonthly Performance

  10. Summary of Observed Datalink Media Usage

  11. ExamplesPerformance by Station Identifier

  12. Station/Gateway Identifiers

  13. ExamplesPerformance by Operator

  14. Observed Datalink Performance by Operator July to December 2011

  15. Observed Datalink Performance by Operator July to December 2011 (Continued)

  16. ExamplesPerformance by Operator/Aircraft Type

  17. ExamplesPerformance by Operator/Airframe

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