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Post-Upgrade Data Link Performance Analysis of R15 Ground Earth Station Software

This document provides a summary of the data link performance analysis following the release 15 (R15) upgrade of ground earth station software. It includes comparisons of the performance before and after the upgrade, with a focus on CPDLC and ADS-C technical performance.

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Post-Upgrade Data Link Performance Analysis of R15 Ground Earth Station Software

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  1. Agenda Item 2.2:Post-Implementation Analysis of Data Link Performance FollowingRelease 15 (R15) Ground Earth Station Software Upgrade SOCM/2 IP/nn Attachment A Bangkok, Thailand 8-10 February 2012

  2. Contents • Summary of Release 15 GES Upgrade • Data Link Performance Analysis of CPDLC and ADS-C Technical Performance by GES • Before = 2 months prior to month in which upgrade occurred • After = 2 months after month in which upgrade occurred • Most recent = November/December 2011

  3. Summary of Release 15 GES Upgrade • Release 15 (R15): Most recent system software upgrade for ground earth stations interfacing with Inmarsat Classic Aero I-3 satellites • Purpose of upgrade: • To improve GES data link delivery capability and aircraft log-on management subsystems • To enhance GES traffic handling and monitoring subsystems

  4. Data Link Performance Comparison forEik GES (XXE)

  5. Summary of Observed Performance Following R15 Upgrade • Eik GES: • Improvement in the ACTP was not observed immediately following the R15 upgrade, but the most recent data does show a noticeable improvement in performance for CPDLC transactions • ADS-C downlink latency performance is observed to have degraded in the period immediately following the upgrade as well as in the most recent period

  6. Data Link Performance Comparison forSanta Paula GES (XXC)

  7. Summary of Observed Performance Following R15 Upgrade • Santa Paula GES: • Improvement can be observed for both the ACTP for CPDLC transactions and ADS-C downlink latency performance for ADS-C downlink messages • Improvement shown to be stable between the period immediately following the upgrade and the most recent period of observation for both performance measures

  8. Data Link Performance Comparison forAussaguel GES (AOW2)

  9. Summary of Observed Performance Following R15 Upgrade • Aussaguel GES: • Improvement can be observed for both the ACTP for CPDLC transactions and ADS-C downlink latency performance for ADS-C downlink messages • Continued improvement shown between the period immediately following the upgrade and the most recent period of observation for both performance measures

  10. Data Link Performance Comparison forPerth GES (POR1)

  11. Summary of Observed Performance Following R15 Upgrade • Perth GES: • Slight improvement can be observed for both the ACTP for CPDLC transactions and ADS-C downlink latency performance for ADS-C downlink messages • Continued improvement shown between the period immediately following the upgrade and the most recent period of observation for ACTP • Improvement shown to be stable between the period immediately following the upgrade and the most recent period of observation for the ADS-C downlink latency performance

  12. Conclusions • Overall improvement in data link performance at GES level following R15 upgrade • Improvement most noticeable at the Santa Paula and Aussaguel GES • In general - upgrade appears to have had more of an impact on the ACTP than on the ADS-C downlink latency performance

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