Satellite Data-Link Communication Seminar

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
Performance Measure Percent of Messages Required to Meet Criteria RSP180 Criteria (sec) RSP400 Criteria (sec) RCP240 Criteria (sec) RCP400 Criteria (sec)
ADS-C Latency 95 90 300 -- --
ADS-C Latency 99.9 180 400 -- --
ACTP 95 -- -- 120 260
ACTP 99.9 -- -- 150 310
ACP 95 -- -- 180 320
ACP 99.9 -- -- 210 370
PORT 95 -- -- 60 60
9
ExamplesMonthly Performance
10
(No Transcript)
11
(No Transcript)
12
(No Transcript)
13
Summary of Observed Datalink Media Usage
Media Percent of ADS-C Messages Percent of RCP CPDLC Messages
SAT 86.4 96.2
VHF 11.9 1.6
HF 1.7 1.2
Mixed Media -- 1.0
14
(No Transcript)
15
(No Transcript)
16
(No Transcript)
17
ExamplesPerformance by Station Identifier
18
Station/Gateway Identifiers
Satellite GES Location(s) SITA ARINC
Inmarsat I-3 Aussaguel, France AOW2AOE2 --
Inmarsat I-3 Eik, Norway AOW3AOE3IOR5 XXE
Inmarsat I-3 Perth, Australia POR1IOR2 --
Inmarsat I-3 Santa Paula, California, US POR4 XXC
Inmarsat I-4 Fucino, Italy EUA1 XXF
Inmarsat I-4 Paumalu, HI, US APK1AME1 XXH
MTSAT Kobe and Hitachiota, Japan MTS1 --
Iridium Phoenix, Arizona, US IGW1 IG1
19
(No Transcript)
20
(No Transcript)
21
(No Transcript)
22
ExamplesPerformance by Operator
23
Observed Datalink Performance by Operator July
to December 2011
Oper Code Count of ADS-C of Total ADS-C ADS-C 95 ADS-C 99.9 Count of CPDLC of Total CPDLC ACTP 95 ACTP 99.9 ACP 95 ACP 99.9 PORT 95
BB 63,168 12.10 99.29 99.49 4,040 11.19 99.03 99.13 99.01 99.36 95.99
AA 61,842 11.85 99.27 99.73 6,452 17.87 99.75 99.84 99.36 99.66 96.84
L 42,893 8.22 97.00 99.27 3,389 9.39 98.76 99.29 97.79 98.41 92.09
FF 38,619 7.40 97.57 99.16 2,955 8.18 99.05 99.26 98.98 99.32 96.07
DD 34,017 6.52 97.01 99.32 2,674 7.41 98.95 99.59 97.83 98.43 91.29
GG 25,263 4.84 99.47 99.83 1,545 4.28 99.74 99.81 99.29 99.29 95.92
EE 24,055 4.61 98.97 99.38 1,835 5.08 99.46 99.62 98.86 99.24 93.24
HH 20,532 3.93 99.64 99.72 1,026 2.84 99.61 99.71 99.03 99.42 96.00
R 19,717 3.78 97.13 99.58 936 2.59 98.72 99.47 99.04 99.68 95.94
JJ 18,052 3.46 99.58 99.92 666 1.84 100.0 100.0 98.65 98.95 93.69
A 15,255 2.92 95.91 98.70 583 1.61 98.28 98.63 98.46 98.97 95.03
24
Observed Datalink Performance by Operator July
to December 2011 (Continued)
Oper Code Count of ADS-C of Total ADS-C ADS-C 95 ADS-C 99.9 Count of CPDLC of Total CPDLC ACTP 95 ACTP 99.9 ACP 95 ACP 99.9 PORT 95
M 14,559 2.79 93.34 96.58 728 2.02 95.74 96.43 94.37 95.88 91.07
CC 14,503 2.78 97.38 98.71 1,175 3.25 99.15 99.23 98.81 99.32 94.30
PP 11,553 2.21 98.71 99.79 719 1.99 99.44 100.0 99.44 99.72 95.69
LL 11,429 2.19 99.08 99.55 1,343 3.72 99.48 99.55 98.81 99.26 97.24
MM 11,293 2.16 99.75 99.93 555 1.54 99.64 100.0 99.28 99.46 96.04
KKKK 11,031 2.11 99.82 99.87 1,204 3.33 99.92 99.92 99.17 99.50 95.51
SS 10,862 2.08 98.29 99.51 504 1.40 99.60 99.60 98.41 99.01 92.06
ZZZZ 9,620 1.84 94.94 96.30 414 1.15 98.31 98.79 96.38 96.62 88.65
WW 6,858 1.31 96.44 98.38 256 0.71 98.05 98.44 97.66 98.05 96.88
DDDD 6,831 1.31 99.93 99.96 581 1.61 100.0 100.0 99.14 99.83 95.52
25
ExamplesPerformance by Operator/Aircraft Type
26
(No Transcript)
27
(No Transcript)
28
(No Transcript)
29
(No Transcript)
30
ExamplesPerformance by Operator/Airframe
31
(No Transcript)
32
(No Transcript)
33
(No Transcript)