Transcript No Slide Title

Shanwick/Gander Datalink
Developments and Plans
Gary Colledge & Iain Davies
National Air Traffic Services Ltd
ATN 2003
24th September 2003, IEE, London
Background
NAT SPG recommendations in 1997 to
accommodate FANS-1/A aircraft.
(NB: SARPs compliant [ATN based]
systems still “end goal”)
Limited to ADS Way-Point Position Reporting
(ADS WPR).
ADS WPR trial from July 1999 leading to an
operational trial Jan 2001.
Widened to phased CPDLC trials in Nov 2002
(Phase 1 & 2).
Achievements
Better working relationships with customers /
suppliers.
Increased knowledge of systems.
Better awareness of customers needs.
ADS WPR - Operational Trial status.
(Gander, Reykjavik, Santa Maria & Shanwick)
CPDLC - Operational Trial status.
(Gander & Shanwick)
Setup of Fans Central Monitoring Agency.
ADS
Pre-operational trials from July 1999.
- HF voice and ADS POS reports.
- Results reported at ATN2000.
Operational trials from Jan 2001.
- HF voice reports no longer required.
30% of NAT traffic now uses ADS WPR.
- Approx 30 Airlines use service.
- Approx 300 flights/day in Shanwick during July.
- Approx 28000 ADS WPR’s / Month.
ADS Waypoint Reporting
SATCOM
VHF
X.25 NETWORKS
ScOACC,
(PRESTWICK)
CAPSIN
(NATS)
ARINC
NETWORK
APN
(ARINC)
ADS reports
OTHER OACCs
eg: Gander
Reykjavik
Santa Maria
X.25 links
POS reports
(AFTN format)
ADS Contract Requests
CENTRAL ADS (CADS)
SYSTEM
AFTN
(ARINC, Annapolis)
ADS WPR benefits to ATC
Reduced Workload:
-
Fewer missing reports.
No corrupt data.
Reduced loading on the HF Aeradio system.
Reduced HF congestion makes other messages quicker to
pass.
Safety:
- Removes possible introduction of errors (e.g. Gross Nav
Errors (GNE)) due to HF interference/mishearing/mistyping.
- Controllers see what is actually stored in FMS.
- Common cause of GNE is difference between FMS and
what pilot reports on HF.
ADS Flight Problems (Jan - Aug
03)
1/2
Problem ADS Flights
700
No of Flights
600
500
400
300
200
100
0
Non FPL FI
Relogged FI per FPL
Category
Delayed Reports due satcom
loss
ADS WPR Problems (Jan - Aug 03)
2/2
Problem ADS POS Reports
4500
Total no of Reports
4000
3500
3000
2500
2000
1500
1000
500
0
Non ATC WPR's HF_ADS Duplicate Fields Missing in
Reports
Non ATC WPR's
Category
Fields Missing in
VHF_SAT
Good WPR's
Duplicate Reports
CPDLC
Phased approach developed by NAT FANS
Implementation Group (FIG).
NATS collaboration with NAV CANADA
Standalone CPDLC system chosen by NATS:
- reason - FDPS costly to modify.
- FDPS is a stable system.
- Disadvantage; limited automation possible.
Shanwick / Gander CPDLC - System
SATCOM
VHF
HF
X.25 NETWORKS
ARINC
/ SITA
NETWORKS
HF Aeradio
CAPSIN
(NATS)
X.25
Messages
To / From
HF Voice
APN
(ARINC)
X.25
CPDLC
Requests /
AFN
CPDLC
Messages
CPDLC
Messages
Dispatch
Operator
ATC / FDPS
CPDLC Uplinks / AFN
CPDLC
Front End
ScOACC,
(PRESTWICK)
CPDLC Host / FANS
Router
(ARINC, Annapolis)
GAATS (NAV CANADA)
CPDLC - Phase 1 & 2
What it does:
Phase 1 level
Phase 2 -
flight crews use datalink to request speed &
changes with response via HF voice.
Automated provision of domestic VHF contact
frequencies to eastbound flights.
Benefits to ATC
-
technical proving of system.
experience of CPDLC operation & features.
building confidence in new technology and procedures.
reduces use of HF voice (Phase 2+).
able to deliver frequencies nearer to the boundary allowing greater flexibility.
CPDLC - Phase 1 & 2
Benefits to Aircrew
-
Requests for changes easier than with HF voice.
Experience of CPDLC operation & features.
Building confidence in new technology and procedures.
Domestic contact frequencies on screen/hard copy.
Less attempt a domestic call on the wrong frequency
as datalink allows later delivery of the allocated
frequency.
- Many flights only do SELCAL check on HF
• Required for Backup.
• no other HF contact is made.
• HF voice still used for non-routine messages.
CPDLC - Phase 3
Phase 3 expected winter 03/04
What it does:
Phase 3 - flight crews receive clearances for
speed & level changes via datalink
(completes loop for Phase 1).
Utilises existing Phase 2 hardware
- Incorporates Modified HMI and.
- Modified Message Set.
CPDLC - Phase 3
Impact on Controllers
Quicker & more reliable communications.
No change in working methods or workload
- Messages are received on screen in the same
way as they are from HF voice.
- Identified to Controller as ‘/CPDLC’.
- Messages are created and sent to the aircraft in a
similar way to HF voice.
Reduced utilisation of the HF Aeradio system.
CPDLC - Phase 3
Benefits to Aircrew
Quicker & more reliable communications.
Less HF workload. / Reduced crew
workload/potential safety benefits.
Improved HF capacity for Non FANS a/c.
CPDLC Statistics
Average of 170 aircraft / day logon to CPDLC.
- Risen from approx 100 to 180 / day from start of
Phase 2 to date.
1109 out of 31437 CPDLC Downlinks were
Unsupported Messages
- Equates to 3.5%.
CPDLC Messages Sent in excess of 70000.
Delay Timings (Feb - Jul 03)
1/2
Round Trip Delay timings from uplink sent to MAS Received
70000
50%
60000
40%
Frequency
50000
40000
30%
30000
20%
20000
10%
10000
0
0%
10
20
30
60
90
120
Upper Limit of Time Bin /Seconds
180
>180
Delay Timings (Feb - Jul 03)
2/2
Downlink Transfer Delay
12000
35.0%
10000
30.0%
Frequency
8000
25.0%
20.0%
6000
15.0%
4000
10.0%
2000
5.0%
0
0.0%
<-90
-60
-45
-30
-15
-10
0
10
15
Time Bin / Seconds
30
45
60
90
>90
FANS-1/A Issues (ADS)
 Centralised ADS system
- Benefit, simplicity for current operation.
- But inflexible. No direct ATC control over reports.
(Future OACC systems (SAATS & GAATS) will
have both ADS & CPDLC capability).
- Can’t request deviation event contracts to improve
safety.
- System cannot be used to support Reduced
Horizontal Separation Minima (RHSM) control
techniques.
FANS-1/A Issues (CPDLC)
Phase 2 Issues
- HMI Development.
- Ground System Errors.
- Ground System Software ‘Bugs’.
- Training.
- Ops Experience.
Future Developments
Localised FANS Functions (Oceanic/domestic
transition)
- provision of domestic routes/re-routes and SSR
codes for eastbound flights.
NON FANS Developments
- FMC WPR.
- use of HF Datalink (initially for FMC WPR).
- provide HF frequency allocations in OCM.
Shanwick/Gander Datalink
Developments and Plans
Contacts :Iain Davies :
email
Tel
Gary Colledge :
email
Tel
John Coulson
email
Tel
Norm Dimock :
email
Tel
: [email protected]
: +44 1292 69 2674
: [email protected]
: +44 1895 423227
: [email protected]
: +44 1293 576385
: [email protected]
: +1 (613) 248 6859
Shanwick/Gander Datalink
Developments and Plans
Gary Colledge & Iain Davies
National Air Traffic Services Ltd
ATN 2003
24th September 2003, IEE, London