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
FAA is developing and deploying decision support tools to aid the air traffic controller. DSTs have many functions such as probing for aircraft-aircraft and/or aircraft-airspace conflicts, safely and efficiently metering aircraft into airports, and providing advisors to air traffic management specialists that specific regions of airspace will reach capacity levels.
Fundamental to all these DSTS is the trajectory modeler function which generates aircraft trajectory predictions. An aircraft trajectory is the actual or prediction of the four-dimensional path of the aircraft. Each DST has required levels of accuracy for its trajectory predictions based on its unique functions and capabilities.

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 --
99.9%
180
400
ACTP
120
260
150
310
ACP
320
210
370
PORT 60

9. Examples Monthly Performance

13. Summary of Observed Datalink Media Usage
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%

17. Examples Performance by Station Identifier

18. Station/Gateway Identifiers
Satellite
GES Location(s)
SITA
ARINC
Inmarsat I‑3
Aussaguel, France:
AOW2 AOE2 --
Eik, Norway:
AOW3 AOE3 IOR5
XXE
Perth, Australia:
POR1 IOR2
Santa Paula, California, US:
POR4
XXC
Inmarsat I‑4
Fucino, Italy
EUA1
XXF
Paumalu, HI, US
APK1 AME1
XXH
MTSAT
Kobe and Hitachiota, Japan
MTS1
Iridium
Phoenix, Arizona, US
IGW1
IG1

22. Examples Performance by Operator

23. Observed Datalink Performance by Operator July to December 2011
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%
99.66%
96.84% L
42,893
8.22%
97.00%
3,389
9.39%
98.76%
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%
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%
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%
99.42%
96.00% R
19,717
3.78%
97.13%
99.58%
936
2.59%
98.72%
99.04%
99.68%
95.94% JJ
18,052
3.46%
99.92%
666
1.84%
100.0%
98.65%
93.69% A
15,255
2.92%
95.91%
98.70%
583
1.61%
98.28%
98.63%
98.46%
95.03%

24. Observed Datalink Performance by Operator July to December 2011 (Continued)
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%
99.79%
719
1.99%
99.44%
100.0%
99.72%
95.69% LL
11,429
2.19%
99.08%
99.55%
1,343
3.72%
99.48%
99.26%
97.24% MM
11,293
2.16%
99.75%
99.93%
555
1.54%
99.64%
99.28%
99.46%
96.04%
KKKK
11,031
2.11%
99.82%
99.87%
1,204
3.33%
99.92%
99.17%
99.50%
95.51% SS
10,862
2.08%
98.29%
99.51%
504
1.40%
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%
96.88%
DDDD
6,831
99.96%
581
1.61%
99.14%
99.83%
95.52%

25. Examples Performance by Operator/Aircraft Type

30. Examples Performance by Operator/Airframe