Federal Aviation Administration Satellite Data-Link Communication Seminar GOLD Data Analysis 8...

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



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



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



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



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



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



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



Examples

Monthly Performance









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%









Examples

Performance by Station Identifier



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









Examples

Performance by Operator



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

%



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

%



Examples

Performance by Operator/Aircraft Type











Examples

Performance by Operator/Airframe







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Federal Aviation Administration Satellite Data-Link Communication Seminar GOLD Data Analysis 8...

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