satellite data-link communication seminar
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Federal AviationAdministration
Satellite Data-Link Communication Seminar
GOLD Data Analysis
8 February 2012
2Federal AviationAdministration
Satellite Data-Link Communication Seminar8 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 RCP400 and RSP400 for HF
Examples of Performance by Specific Factor Station Identifier Operator Operator/Aircraft type/Airframe
3Federal AviationAdministration
Satellite Data-Link Communication Seminar8 February 2012
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
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Satellite Data-Link Communication Seminar8 February 2012
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
5Federal AviationAdministration
Satellite Data-Link Communication Seminar8 February 2012
GOLD Analysis Overview: CPDLC Performance Measures
1 42 3
ACP
Up Down
nt)(Uplink_Seeived)(WILCO_RecACP
DownΔ2
UpΔACTP
ACTPACPPORT
1. Uplink Sent. This is the date/time that the CPDLC clearance was sent to the aircraft.
2. MAS Received. This is the date/time that the MAS for the CPDLC clearance was received.
3. WILCO Sent. This is the date/time that the WILCO reply is transmitted.
4. WILCO Received. This is the date/time that the WILCO reply for the CPDLC clearance was received.
The measurements (in seconds) are calculated as follows:
TRN
RCTP
Responder
6Federal AviationAdministration
Satellite Data-Link Communication Seminar8 February 2012
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
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Satellite Data-Link Communication Seminar8 February 2012
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
GOLD Analysis Overview: Interpreting GOLD Charts
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Satellite Data-Link Communication Seminar8 February 2012
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-CLatency
95% 90 300 -- --
99.9% 180 400 -- --
ACTP95% -- -- 120 260
99.9% -- -- 150 310
ACP95% -- -- 180 320
99.9% -- -- 210 370
PORT 95% -- -- 60 60
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Satellite Data-Link Communication Seminar8 February 2012
Examples
Monthly Performance
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Satellite Data-Link Communication Seminar8 February 2012
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Satellite Data-Link Communication Seminar8 February 2012
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Satellite Data-Link Communication Seminar8 February 2012
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Satellite Data-Link Communication Seminar8 February 2012
Summary of Observed Datalink Media Usage
MediaPercent of ADS-C
MessagesPercent of RCP
CPDLC Messages
SAT 86.4% 96.2%
VHF 11.9% 1.6%
HF 1.7% 1.2%
Mixed Media -- 1.0%
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Satellite Data-Link Communication Seminar8 February 2012
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Satellite Data-Link Communication Seminar8 February 2012
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Satellite Data-Link Communication Seminar8 February 2012
Examples
Performance by Station Identifier
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Satellite Data-Link Communication Seminar8 February 2012
Station/Gateway Identifiers
Satellite GES Location(s) SITA ARINC
Inmarsat I‑3
Aussaguel, France: AOW2AOE2
--
Eik, Norway: AOW3AOE3IOR5
XXE
Perth, Australia: POR1IOR2
--
Santa Paula, California, US:
POR4 XXC
Inmarsat I‑4
Fucino, Italy EUA1 XXF
Paumalu, HI, USAPK1AME1
XXH
MTSATKobe and Hitachiota, Japan
MTS1 --
Iridium Phoenix, Arizona, US IGW1 IG1
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Satellite Data-Link Communication Seminar8 February 2012
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Satellite Data-Link Communication Seminar8 February 2012
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Satellite Data-Link Communication Seminar8 February 2012
Examples
Performance by Operator
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Satellite Data-Link Communication Seminar8 February 2012
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
%
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Satellite Data-Link Communication Seminar8 February 2012
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
%
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Examples
Performance by Operator/Aircraft Type
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Satellite Data-Link Communication Seminar8 February 2012
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Satellite Data-Link Communication Seminar8 February 2012
Examples
Performance by Operator/Airframe
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